How to Allocate Memory in C

C is a middle level computer programming language that is developed in 1973 by Dennis Ritchie at the Bell Labs. C was initially designed for implementing system software but now it is also widely used to develop portable application software. C is one of the most talked about programming languages of all times. There are very less computer architectures for which a C compiler is not there. C is responsible for affecting many other popular programming languages, most notably C++.  The most important function of a programming language is to manage memory and the objects that you store in memory. If you also look out for how to allocate memory in C, you are surely at the right place. This paper helps you to know about pointers and memory allocations in C.

There are three distinct ways to allocate memory for objects in C:

Static memory allocation:

At compile time, the required space is allocated for the object in the binary. These objects will exist as long as the binary exists and these objects are loaded into memory.

Automatic memory allocation:

You can store the temporary objects on the stack. This space is then automatically emptied and reusable after the block in which they are declared is exited.

Dynamic memory allocation:

You can request the blocks of memory of arbitrary size at the run-time using library functions. The library functions can be malloc() and it is from a region of memory called the heap. These blocks remain until they get free.

All these three approaches can be appropriate depending upon different situations. For example, static memory allocation does not come with any allocation overhead. The automatic allocation may have a small amount of overhead, and dynamic memory allocation can have a larger overhead for both allocation and deallocation. On the other hand, stack space is limited and transient than either static memory. Dynamic memory allocation allows allocation of those objects for which size is known only at run-time. Most C programs take the advantage of all the three approaches.

Usually, automatic or static allocation is preferred because the compiler manages the storage issues. This removes any possibility of error of manually allocating and releasing storage for the programmer. However, different data structures can increase in size at runtime. Since, static allocations need to have a fixed size at compile-time; you can use dynamic allocation in such situations.

You can initialize automatically and dynamically allocated objects only if you have explicitly specified an initial value. Otherwise, they initially have indeterminate values. Whenever the program tries to access an uninitialized value, you cannot define the results. Many modern compilers try to detect this problem, but both false positives and false negatives occur.

Another issue is that you need to manually synchronize the heap memory allocation with its actual usage in any program. This helps to reuse it as much as possible. There can be two scenarios for the only pointer to a heap memory allocation. The one is that when it goes out of scope or its value overwritten before free() has been called, then you cannot recover the memory for later reuse. This memory is essentially lost to the program. This is a phenomenon known as a memory leak. On the contrary, it is also possible to release memory too soon and continue to access it. However, as the allocation system can re-allocate or can use the freed memory, unusual behavior may occur. Typically, the symptoms will be shown in a portion of the program than the actual error. This can make it difficult to track down the actual problem. You can find such issues that have automatic garbage collection.

You can easily allocate memory at run time using malloc(), calloc(), or other allocation functions. This approach lets you to postpone the decision on the size of the memory block need to store an array. This can happen until run time. It may also permit using a section of memory for the storage of an array of integers at one point in time. The memory that you no longer need, can be emptied for other uses such as the storage of an array of structures.

When you allocate the memory, the allocating function like malloc(), calloc(), etc. replies with a pointer. This pointer depends on the type of compiler you are using. It can be an older K&R compiler or the ANSI compiler. The older compiler returns the pointer of char data type, whereas the ANSI compiler returns void.

If you use an older compiler and you are looking to allocate memory for an array of integers, you need to cast the char pointer returned to an integer pointer. For example, if you want to allocate space for 10 integers, you might write like:

int *ipt;

ipt = (int *)malloc(10 * sizeof(int));

if (ipt == NULL)

{ERROR ROUTINE GOES HERE}

With an ANSI compliant compiler, malloc() returns a void pointer. As you can assign variable of any object type to the void pointer, you do not require any (int *) cast as shown above. You can determine the array dimension at run time and it is also not needed at compile time. You can read the 10 above as a variable from a data file or keyboard, or calculated based on some need at the run time.

As there is some sort of equivalence between array and pointer notation, once ipt has been assigned as above, you can use the array notation. For example, you could write:

int k;

for (k = 0; k < 10; k++)

ipt[k] = 2;

to set the values of every element to 2.

Even if you have a reasonably good understanding of pointers and arrays, you can stumble at first in the dynamic allocation of multi-dimensional arrays. In general, you can access elements of such arrays using array notation, not pointer notation, wherever possible. You can easily allocate memory in C after reading this article. Now, I believe that you have enough information on how to allocate memory in C.

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How to Allocate Bandwidth

In computer networking’s language, bandwidth is basically a bit rate measure of available or consumed data communication resources. It is expressed in bits/second or kilobits/s, megabits/s etc. Bandwidth is a critical resource. You need to know how to allocate bandwidth for its efficient use. Bandwidth may refer to digital communications, wireless communications, electronics, etc. Bandwidth is the analog signal bandwidth measured in hertz. Some authors also prefer to use terms such as bit rate, channel capacity and throughput rather than bandwidth in bit/s.

Bandwidth management also refers to allocation of the bandwidth. It is a means of allocating bandwidth to critical applications. Without the allocation of bandwidth, an application can take control of all the available bandwidth. This can prevent other applications from accessing the network. As it is almost impossible to differentiate types of network traffic, so it is impossible to control, about which applications have the priority on the network. Most of the applications require a specific quantity and quality of service. This cannot be predicted in terms of the available bandwidth. It just results in some applications to run poorly if proper bandwidth is not allocated to them, whenever required.

The allocation can be done by sorting outbound network traffic into classes by application and service type. Data traffic now scheduled depending upon the minimum and maximum bandwidth configured for each traffic type.

How to allocate bandwidth on a Linksys router:

A Linksys router assigns an internet connection among all the computers on your network. This allows every machine to access the web and download files simultaneously. Connection sharing can result in the loss of speed if some computers are using much more bandwidth. It happens at the time of downloading large files. Any Linksys router allows allocating the bandwidth after which no single computer is able to take all the bandwidth available.

Instructions:

Navigate your browser to “http://192.168.1.1″ to open the Linksys router’s interface page. You need to write “Admin” in the “user name” field in the empty field.

Leave the “password” field empty if you haven’t changed the default password. Click “Log In.”

Navigate the “Applications & Gaming” tab that is at the top of the window. Now click on the “QoS” link in the menu that is under the “Applications & Gaming” heading.

Now, click the “Enable” radio button to turn the Quality of Service feature on. Click at the specific port or service you want to change like “Port 1″ to the computer connected to the Linksys router’s first port or “FTP” for the data transferred through an FTP service.

Click the “High Priority” button to give most bandwidth to that port or service. Choose “Medium Priority” or “Low Priority”, if you want to give less bandwidth to that port or service.

You can repeat this process with any other ports or services. Now there is a need to click “Save Settings” to save the bandwidth allocations.

Why Use Bandwidth Management?

Corporate networks that use intranets to share information and web navigation have a requirement for bandwidth.  If you add more connections or larger connections, it does not address the bandwidth issue because you cannot guarantee the availability. All the network links are shared by many users or applications, which mean that these users and applications share the same available bandwidth. Bandwidth management can stop traffic congestion on the network. You can also prevent temporary network congestion by using bandwidth management. When the network is congested for a long time, experts suggest the greater capacity link.

Sonic Wall Bandwidth Management:

Sonic wall internet security controls the bandwidth management. It helps network administrators to guarantee minimum bandwidth. They can now prioritize the data traffic based on the rules created in the access section of the sonic wall management interface. If you can control the amount of bandwidth to an application or user, you can prevent a small number of applications or users to consume all the available bandwidth.

Bandwidth Management Features & Benefits:

Traffic Type:

You can manage the data traffic according to the traffic type i.e. Telnet, FTP, HTTP, etc.

IP Address:

You can configure the network access rules to allocate bandwidth based on IP addresses.

VPN Allocation:

You can also manage the VPN traffic by enabling bandwidth management in the VPN configuration. Then specify the Guaranteed, Maximum, and priority of all VPN traffic through the sonic wall. You cannot configure bandwidth management for individual VPN security associations. You can configure it only for all VPN traffic.

Full control:

The network administrator takes full control of network traffic and he also prevents traffic congestion on the network.

Application management:

It prevents the applications and users from consuming all available bandwidth.

QoS policy driven:

You can implement quality of service (QoS) policies across the network allowing priority applications to run smoothly.

You never want your network feel unavailability of bandwidth. This can reduce the efficiency of the computers. You will receive the output in a longer time as the speed is less now. You need to allocate bandwidth based on the priority. I am quite sure that now you know a lot on how to allocate bandwidth.

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How to Allocate System Memory

The system memory stores the current programs and data in use. The term memory can refer to many different parts of a computer because computer uses different kinds of memory. When the computer itself uses the memory, it usually refers to the main system memory. If you look for how to allocate system memory, you are surely at the right place. This paper will provide you with all the details about system memory and its allocation. The system memory stores the instructions that the processor executes and the data that those instructions work with. The system memory is a critical part of the main processing subsystem of the computer, tied with the processor, cache, and motherboard.

Memory is very important for various aspects of your computer system:

Performance:

The amount and type of system memory is a very important contributing factor to the overall performance. It is even more important than the processor in many ways because low memory can make the processor to work at 50% or even more below its performance potential. The most important factor that is overlooked is the performance.

Software Support:

The new programs need more memory than the old programs. More memory can help you to give access to those programs that you cannot use with a lesser amount.

Reliability and Stability:

Bad memory can result into mysterious system problems. Make sure that you have high quality memory. It will result in a computer machine that runs smoothly and exhibits fewer problems. Also, sometimes even high quality memory will not work well if wrong kind of memory is used.

Upgradability:

Different types of memory are available. Some memories are even more universal than others are. A wiser choice is to transfer the memory to a future system or continue to use it after you upgrade your computer.

This section describes various aspects of the system memory like how the system memory works, the different types of technologies used and how operating systems and programs organize and use the memory in the computer. Error detection and correction requires greater attention as well as details on what type of memory is suitable in different types of computers.

Allocating System Space Memory:

To allocate I/O buffer space, the best memory allocation method to use is MmAllocateNonCachedMemory, MmAllocateContiguousMemorySpecifyCache, AllocateCommonBuffer (when the driver’s device uses DMA or a system DMA controller’s auto-initialize mode), or ExAllocatePoolWithTag.

Non paged pool try to become fragmented as the system runs, so a driver’s DriverEntry routine needs to call these routines to set up any long term I/O buffers the driver needs. All those routines, except ExAllocatePoolWithTag, assign memory that you align on a processor specific boundary. This you can determine by the processor’s data cache size to provide the best performance.

Drivers need to allocate I/O buffers as readily as possible, since the nonpaged pool memory is a limited system resource. In general, a driver has to avoid calling the support routines repeatedly to ask for allocations of less than PAGE_SIZE.

Allocating Driver Buffer Space Economically:

If you want to allocate I/O buffer memory economically, you have to keep in mind the following points:

Every call to MmAllocateNonCachedMemory or MmAllocateContiguousMemorySpecifyCache always gives a full multiple of the system’s page size of nonpaged system-space memory irrespective of the size of the requested allocation. Therefore, any request for less than a page is rounded up to a full page. If any remainder bytes on the page are wasted, then the driver who called the function is not able to access them.

Each call to AllocateCommonBuffer employs at least one adapter object map register. This register maps at least one byte and at most one page. If you want to know more about map registers and using common buffers, you can refer to adapter objects and DMA.

Allocating Memory with ExAllocatePoolWithTag:

Drivers can call ExAllocatePoolWithTag too. Therefore, specifying one of the following system-defined POOL_TYPE values for the PoolType parameter:

NonPagedPool for any objects or resources not saved in a device extension or controller extension that the driver can access while running at IRQL > APC_LEVEL

For this PoolType value, ExAllocatePoolWithTag assigns exactly the same amount of memory as requested if the given NumberOfBytes is less than or equal to PAGE_SIZE. Otherwise, you will waste any remainder bytes on the last-allocated page. These bytes are inaccessible to the caller and unusable by other kernel-mode code.

On an x86, an allocation request of 5K replies with two 4K pages. The caller will never receive the last 3K of the second page. You can avoid wasting nonpaged pool by allocating multiple pages efficiently. In this case, the driver could make two allocations of one PAGE_SIZE and the other for 1K. That can allocate a total of 5K.

PagedPool for memory that you can always access at IRQL <= APC_LEVEL and is not in the file system’s write path.

ExAllocatePoolWithTag always returns a null pointer if it is unable to allocate the requested number of bytes. Drivers need to check the returned pointer. If it returns null value, the DriverEntry routine should return STATUS_INSUFFICIENT_RESOURCES.

Graphics memory and system memory both share the memory of your computer. By default, any computer allocates 8 MB of the total memory to graphics. You can allocate 32 MB memory for graphics.

How to allocate system memory:

1. Restart your machine. When you see a startup screen, you need to press the F2 button. The BIOS Setup utility opens.

2. Click the Advanced tab and then select Shared memory.

3. Allocate the graphics memory size based upon the requirement and then click OK.

4. Now you have to exit the BIOS setup utility by clicking on the Exit button. Now, select Save and Exit.

5. Click OK.

You never want your computer to be low on system memory. This can reduce the efficiency and productivity of the computers. Output can take a longer time as the speed is less now. I believe that you have enough information on how to allocate system memory.

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How to Publish Your Own Book

Self-publishing is one of the smarter options for writers as it is cost-effective, fast, pays better than the standard contracts and lets an author have control over the publishing process. But there are a few drawbacks as well if you think of publishing your own book as one needs to be very learned and ready to face all the challenges coming your way. So how to publish your own book?

Here are a few instructions to be followed in order to self-publish your book:

  • Set your goal before hand. Some writers want to just print a few copies of their prized projects for close friends and colleagues whereas others want the book to be published on a large scale for a bigger audience.
  • Check for other competing titles in order to make sure that you are not covering the same topic. Check out sales of the related books to find if it is really worth writing on a similar topic. For more details, one can contact the book distributor Ingram at (615) 213-6803, and type in the ISBN of the book that you wish to check. You will hear a voice message that will contain information on the number of copies sold in the last year.
  • Decide on the format you would like to publish namely hardcover, softcover or e-book – an electronic file that does not require paper printing
  • Find for print-on-demand publishers, if you wish to get you books published without spending much. Print-on-demand is perfect to print just a few copies namely 25 to 500. The pages are printed using a high-end copier instead of the traditional ink-based offset printing equipment. The page layout program directly links to a high-speed copier. Once the pages are printed, it needs to be bound together. Some shops offer perfect bind, and it looks like a printed book.
  • In order to save on film costs and time, you can print your book directly from your completed files with the help of a directtopress printer. The files can be transferred directly to the printing plate instead of producing a different piece of the film for each color of each page.
  • If you are an established writer who is considering self publishing, check for all the options available and personally look into each of the steps that goes into publishing your book
  • Check samples of recently published books from potential suppliers. Check for the quality of the paper, cover design, layout and if it was run on a sheet-fed press or a web press. Get detailed information of how the individual pieces were produced.
  • Get yourself familiarized with the printing costs. This will differ but you can expect to spend more than $1 per book for printing a minimum of several thousand copies. You may also incur extra charges for layout help, editing, design of the book cover and for photos. Generally it is $3 to $6 for editing a page, $3 to $5 for production, $500 to $5,000 or more for design, plus an addition of $3 per book for printing a $300 page book.
  • You can also think of hiring a book designer to design the book. This could be expensive, but it would create a difference in creating quality products.
  • Request for an International Standard Book Number (ISBN), which is a standard code to identify your book. This can be done by visiting, isbn.org. The cost for 10 ISBNs is $150, with an addition of a minimum $75 processing fee.

Decide on strategies of distributing your book. You can either opt for in-house selling offered by print-on-demand companies or check with book stores if they wish to accept limited number of your books on consignments.

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How to Publish a Book

If you have a flair for writing and think that you can keep the audience enthralled with your work, consider writing as a profession. If your writings enchant even a handful of friends, you can definitely create a mark for yourself, considering the rubbish work of writers whose books adorn the shelves at most public places and in return are paid heavily for the crap! You can publish tour book and earn your place. So how to publish a book?

Before you start writing, it is advisable that you do not write at all. You must be wondering what this is all about? But if you think from the publishers point of view, it is advisable that you write about the current trends and topics which are most sought after by the audience. There is no point, spending years, writing something, which nobody wants to read. You need to first consider getting a literary agent, as the literary world is a very close knit community, and they accept books only through very specific channels. The agents would help you in churning and filtering the topics and recommend the ones which are needed by most publications and in demand.

What’s the role of an agent?

An agent is a separate individual, who acts as a middleman between you and the publishing house. He/ she knows what the publishers want. If you sent a manuscript directly to the publishers, do you think they are going to read it? It happens most of the time and with most renowned publishers that they consider your writings and go through the pieces only if they are recommended by an agent. Agents read the manuscripts or ideals and decide if a project is promising.

If the agent feels that the work is good, he would sign a contract with the author, promising that he would put his best efforts to get the work sold to a publishing house for a 15% deal. And it is really not all that easy to please an agent. Agents at times can be very choosy about who they sign, as this would hamper their reputation with the publishers. In most cases, the editors at publishing houses deal with only those agents who have a very good track record and are known for presenting quality work. It is therefore essential that you get an agent on board. Once you are signed by an agent, half of the work is done.

Agents, like publishers, do not like to read the entire manuscripts. In fact they do not read more than 1 page. So if you want an agent to pay attention to your work, send a query letter to the said agent. A query letter is a short summary of your ideal, who you are and why you are qualified to write for the said project.

If you still think that getting an agent is an expensive deal and you would not like to part with 15% of the profits, think again. It is really worth all the money once you are signed by an agent. You will find thousand of literary agents across America and a few very good guides who provide millions of information about what kind of work they are looking for and how to contact them.

Finding Appropriate Publishers:

For all those who would like to go without an agent one can always contact medium sized to small publishers, who are good options for first time authors. Here’s how you can go about finding probable publishers

  • Visit a good bookstore which is quiet commercial in nature. Check the sections of the books and note the categories in which your book falls. Look for the publishers of the books. You should find as many as you can. These are the publishers who would be most interested to publish your work, since they know the market and where the books are in demand. These publishes should form a list to be contacted.

Visit a university library and look for the following reference books, Writer Market or Literary Market Place. The former has a list of all the publishers in the country and the type of book they publish. It also gives details of how to submit, along with phone numbers and addresses to the publishing house. There are also sections and categories so that you reach the right topic related to your book. The second book is more or less the same, but it is less user friendly as it is made from the publishers’ point of view rather than the writers.

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How to Untangle Bike Chain

A very important part of your cycle is your bike chain. The chain generates the force that carries power from the pedal to the wheel. This makes the wheel to move. Sometimes the chain gets tangled. You need to know how to untangle bike chain using some easy methods. You can find many papers on the internet that talk about untangling the chain. If you are going on a long bike trip, you should go through this paper. This paper can surely help you to untangle your chain.

When you manufacture the bicycle chain, the hollow rivets hold two side plates together. When you unlink the bicycle chain while riding the bike, the ends of the rivets flush with the inner plates. The outer plates cover the inner rivets. Bike chains only become irritating when they get the twists in them. Here you can find the method of untangling the chain as easy as possible:

How to untangle bike chain:

  1. Take the longest part of the chain in one hand. Take the part of the tangle, which is hanging loose in your other hand.
  2. Bring the free part of the tangle to the longest part. You need to do this in a delicate, straight line. You cannot allow further tangling to take place.
  3. Now, take the chain in your hands from below and turn the chain upside down. Shake with force for quick untangling. The chain will untangle itself as you start to shake.

If you follow this procedure, the chain will untangle 80 to 90 percent of the time. If the chain doesn’t untangle at first, try the whole procedure once again. If this method fails even after a few patient tries, you should not lose all your hope. Just keep a look at what tangles remain in the chain. Try to remove the tangles by taking the smaller length of the chain at a time than previously. Just take little tangle by little tangle, and restore it to a straight line.

Just make sure of any wear or tear in your chain before putting it to use on a bike.It is quite natural that chains might get tangled up. But when it got tangled on the bike then you need not panic at all. You can untangle the chain without breaking the chain.

Just patiently try to work the chain in different directions and after some time the chain begins to straighten out. I suggest you to do it yourself. When you untangle it at your own, you will be proud.

Don’t over lubricate the chain as it can increase the mess. In reality, very little oil is required. When you hear shrilling, just put one drop of bike oil on each link. Rotate a few times and remove the excess with an old rag.

You can also carry a little thing in back by the back wheel. This thing kind of sticks out and holds the chain, and there should also be a gear on it that is small, maybe of 3 inches in diameter. This is known as derailleur. Derailleur changes the gears. When you push this thing in towards the crankshaft, it will loosen the chain. This will eventually make the chain easier to untangle.

One more thing, most importantly, you need to tighten the chain.

Maintenance:

A chain guard should be there to protect the bike’s chain.

You need to know how best you can lubricate your bike chain. Liquid lubricants that go inside the links are not easily displaced. They quickly attract dirt. Dry lubricants on the other hand that contain wax or Teflon are made up of an evaporating solvent and remain cleaner in use. The cardinal rule for long life of your chain is to never lubricate a dirty chain. This can wash abrasive particles into the rollers. You need to clean the chains before lubrication. You should wipe the chain dry after the lubricant gets enough time to penetrate the links. There is also an alternative approach. This is to change the chain with a relatively cheap chain. In this case, now proper care is less important. Some utility bicycles come with fully enclosing chain guards, which virtually eliminate chain wear and maintenance.

You never want your bike chain to get tangles. These tangles can make it difficult for you to enjoy your ride. So you need to remove the tangles at any cost. I am quite sure that by now you have enough on how to untangle bike chain.

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How to Swipe Breakdance

The swipe is a very powerful move in breakdance. The b-boy or b-girl leans back and whips his or her arms to one side to touch the ground. Then his or her legs come from behind. Then there is a twist of 360 degrees to land on the ground once again. These dance moves may look difficult in the beginning. But if you want to know how to swipe breakdance and if you are determined enough, you can learn these moves.

Variants:

Normally the swipes start from the crab position. Also, there might be air swipes in which the b-boy jumps back directly from a standing position into a swipe. Sometimes he/she can end up in a standing position. Without taking the beginning into account, there are many swipe variations that basically differ in terms of which parts of the arms hit the ground.

  • X – swipes – Swipes keeping legs crossed
  • Baby Swipe – In this swipe, mostly the footwork moves, launched from the 6-step that has a twist of the hips similar to the swipe.
  • Elbow Swipe – In this swipe, the elbows replace the hands.
  • Forearm Swipe – As the name suggests, the forearms replace the hands.
  • Head Swipe – In this swipe, the head replaces the hands.
  • Master Swipe – Both hands go in the air at the same time and both legs lift simultaneously as well.
  • One-Footed Swipe – You need to keep one leg in the air, often pointed straight out. The leg is generally on the inside of the rotation.

I will break the steps as it can help you to practice it in a slow motion. Take it slow before trying the full speed. If you try with full speed right from the start, you will definitely end up in failure and confusion.

This tip works well for many other moves also. Always try new moves in a slow motion and then with time and practice, increase the speed. This also helps you to take advantage of your muscle memory. Your brain memorizes easily when you are going slowly.

How to Swipe Breakdance:

First of all start with the table position.

You can get into this position by sitting on the ground with your legs in front of you. You need to keep your feet on the floor with almost a shoulder distance between them. Put each hand down on its respective side, with the fingers pointing out or up.

Now raise your pelvis up into the table position. The upper body has to be parallel to the floor at this point.

Many 90-degree angles are present in this field that makes it easy to identify:

Bend the knees at 90 degree angle from ground and your chins need to form a 90 degree angle from your arms and upper body has to be at 90. Your arm and the ground have to be at 90 degrees.

To keep on holding this position can be a little difficult for a beginner. The longer you try to hold it, the easier it will become with time.
Step 1: Arm Swings

Once you achieve the right table position, try to lift your one arm up to the ceiling. Now put the arm back down and then try to lift your other arm. It is normal if you feel that one side is easier than the other is.

Once you learn to lift up each arm individually, you can go on to the next level. With the help of one arm up, you now have to switch arms. Now for a split second, you will have no hands on the ground.

You can achieve this by swinging the arm that is up, out to your side. Then, swing it downwards toward the ground as it goes for a landing.

When you start to swing the arm, you need to push off with your hand that is right now on the ground. This is the moment when you will have no hands on the ground.

You can also make this movement easier by rotating the upper body at the hips at the time of pushing with the grounded arm. You have to rotate your upper body towards the arm that will rest on the ground.

Now it’s time to practice both sides with these arm swings. This will help you to switch arms from the one handed table position.

Always remember to have your pelvis up as you switch the arms. This can make it easier to do the swipe.

Now half of the swipe is over where your legs haven’t even moved. The movement of legs will occur in the second half.
Step 2: Arm Swings Over and Legs Follow

You need to get back into the one handed table position. Your upper body has to be parallel to the floor. Your knees need to be bent at 90 degrees.

This part is a little tricky. Here most of the beginners get confused. This happens because they try to go faster than they should do it. Start slow and then gradually increase your speed.

Take the arm, which is in the air, and whip it across your body. Your arm needs to be targeted at landing shoulder wide apart.

Here is one tricky part:

As the arm swings up and over, you have to push hard with both legs to follow the rotation of your upper body.

The time when your legs are above the ground and rotating, keep them bent at the knees at about 90 degrees ideally. This can help you to land easier.

The swinging arm lands to the side your body. Your legs still have to be in the air. Put your whole weight on that arm once you land.

Lift your other arm as your feet hit the floor. From this position, you can easily switch arms from this position like discussed earlier.

Anyone who is determined to learn swipe breakdancing can do it just by following certain steps. I am sure, now you know how to swipe breakdance in a very good way.

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How to Master Swipe

The master swipe is also known as air swipe. It is one of the most powerful moves in breakdancing. It is a comparatively difficult move. It involves the breakdancer to support his weight with his arms in a handstand. There has to be a torso and legs twist in the air at 360 degrees. Do you want to master the swipe? If you are looking for how to master swipe, then you are at the right place. This paper can help you in learning the dance move very easily. Many variations of master swipe are there such as one leg swipes and baby swipes.  You can see the swipes in a Hollywood blockbuster movie such as “Office Space”.

Master swipe is a fundamental b-boy move for all types of breakdancers. You can combine it with difficult moves to result into aerial combinations. You can swipe on all fours in the crab position. You need to twist to your side and then land in the same position. Legs need to follow then and they need to move faster than your arms.

Types of swipes:

The swipes generally begin from the crab position. Without taking the beginning into account, there are many swipe variations. They differ basically in terms of which parts of the arms hit the ground first.

  • X – swipes – These are the swipes with your legs crossed
  • Baby Swipe – In this swipe, mostly the foot move, launched from the 6-step that has a twist of the hips.
  • Elbow Swipe – In this swipe, the elbows replace the hands.
  • Forearm Swipe – In this swipe, the forearms replace the hands.
  • Head Swipe – In this swipe, the head replaces the hands.
  • Master Swipe – Both hands go in the air at the same time and both legs lift simultaneously as well.
  • One-Footed Swipe – You need to keep one leg in the air, often pointed straight out. The leg is generally on the inside of the rotation.

How to master swipe:

First of all, you need to stand up. I will explain to go towards left. Try to lean back as far as possible. Now you need to lift your left leg and bring the knee to the middle of your rib cage. Keep the chin parallel to the floor. This helps you to lean farther. You need to lean so far such that your whole body becomes parallel to the ground. You have to be a weird freak to do this move otherwise you will never be able to do it. Put both the arms on the right side. Now whip the arms back to the left. At the same time, go towards the floor in such a way that your left hand can touch. The legs still need to be in the same position. When the right hand moves down to the ground, the legs have to start swinging also. Jump as high as possible otherwise you will hurt your feet very badly. Right now, both the hands are touching the ground and the legs and body are swinging around. You need to go with the flow of the momentum and bring the left hand off with the same speed and time as your legs. All the movements should come naturally. The right foot needs to hit the ground and after that, your left arm has to swing around in a circular motion and touch the ground. These are very powerful power moves.

Tips to learn and master swipes:

First try the normal swipe. Try to jump higher and kick the left leg into the air. After this, try to swipe around. It is easy. Try to work on your balance and how you move your hands to the floor.

If you are determined to learn the master swipe, nothing can stop you. You just need to follow certain steps and practice them a lot. I am sure, now you know how to master swipe very well.

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How to Allocate Virtual Memory

Virtual memory can make a computer program believe that it has a continuous resource of working memory. This memory helps the computer to operate at a faster speed. Virtual memory can help in an efficient use of the RAM of a computer. If you want to know how to allocate virtual memory, you are at the right place.

The virtual memory can also increase the overall computing speed of the computer. Virtual memory makes use of hard disk space to help in providing more RAM memory than installed. It gives the impression to the user that he has got more RAM memory to improve the overall system performance.

Memory versus Disk Space:

When any computer geek talks about computer memory or RAM, we are talking about some silicon chips in the computer. This just stores things like the programs you’re running right now or any open document file or the email you’re going to send. Computers can have memory between 128 MB and 4 GB. Each time you shut down your computer, anything stored in RAM is gone. So, you should save the data to the disk at the time of editing a document.

When we talk about disks, it is the hard disk drives of your machine. A hard disk drive consists of several metal disks coated with a magnetic material. Magnetic thing is just like a video or audio tape or the strip on the back of a credit card. The disk spins at a high speed. The special heads read or record the pattern of bits (1’s and 0’s) on the magnetic material. The OS assembles the bits to bytes and the bytes into the files. Files are something that you might receive or achieve. You do not lose the data when the power is shut down. The disk sizes come in the range of 20 to 400 gigabyte.

Disks are much slower than the memory. In fact, they are too slow to directly work from your computer. So generally, you need to load your program or document into memory from the disk. Then run or process it on memory, and then save the updates back to the disk.

Virtual Memory is just the same as the operating system that uses some amount of disk space as if it is a real memory.Exact implementation of virtual memory is complex.

Now your program requires memory. The operating system tracks which program uses what portions of memory. It allocates the program, the required amount of memory.

As the complexity of the programs increase, they need more memory. When you open a large document, your word processor may request additional memory from the operating system to hold the document.

When there is not enough memory to satisfy a request, the operating system can decide that some other program’s needs are relatively less important. Some memory of that program will be released. This happens by first writing the contents to disk and then allocating the content to the program to complete the request.

Later if the program whose memory we swapped can be swapped in by reading it from the same disk. This can cause the removal of another program’s memory to be written off to the disk.

One more thing to remember is that the operating system is also a program. So it also needs memory. It allocates memory to itself. You can swap the memory of the operating system to the disk depending on the requirement.

As the disks are slower than memory, so when there is too much swapping of memory by the operating system, then computer is surely going to slow down. If it happens frequently or if the computer thrashes, then there might be a need to add some memory to your machine. You can definitely increase the system’s speed through this method.

Systems that employ virtual memory:

  • Results in efficient use of hardware memory
  • Make the application’s programming easy
  • Hiding fragmentation
  • Pass on to the kernel the burden to manage the memory hierarchy. No need to handle program overlays explicitly
  • Preventing the need of relocating program code
  • Preventing the access of memory with relative addressing

How to allocate virtual memory:

You need to single left click the computer icon on the computer’s desktop. Now, right click the icon to choose the properties menu option.

Now choose the “Advanced system settings” option. Select the “Settings” option from the options on the screen.

You have to now choose the “Change” option to change the size of the virtual memory paging file. Now, left click on the check box that you selected for the Windows to manage the computer’s virtual memory.

You now enter the initial and final value for the virtual memory paging files in the text fields. Select the “Enter” button. Now, choose the “OK” button to finish the modification of the computer’s virtual memory.

Thrashing:

The operating system constantly swaps information back and forth between RAM and the hard disk. This is called thrashing. This can make your computer feel incredibly slow. The area of the hard disk which is used to store the RAM is called a page file. It stores the pages of RAM on the hard disk. The operating system exchanges the data back and forth between the page file and RAM. On Windows machine, page files have a .SWP extension.

Always keep a small page file on your main disk. It should be quick especially on random accesses. Even if the disk corrupts, your system still operates effectively. You should not take your entire disk for a page file. 2 MB to 50 MB is a good size to keep on your main disk.

You never want your computer to get overloaded with the running programs. This can hamper the speed of the computer. Your output will surely come in a longer time. You need something like virtual memory to process the programs faster. I am quite sure that by now you get enough on how to allocate virtual memory.

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How to Write an Observation Essay

It needs to understand how to write an observation essay. An observation essay is not a conventional essay, as it should be framed in a report format covering all the necessary points and mentioning mandatory things that have been observed or monitored by an individual. While writing an observatory description, it is required to frame your word as per the subject on which you are writing. There are different objects and subjects on which one can write an essay. Observation writing is a medium through which one can express what they have noticed and the merit of the product or object they have sighted. Observatory note can be drafted for any thing whether it’s a human being or any non-living object. Observation essay should be framed in such a way that it offers a clear description to its reader in an effective way.

Some of the key observatory description one can write on:

  • Children behavior
  • Employee’s behavior
  • Patient observation
  • Scientific observation

If you are writing an essay on child observation, it is required to start the segment with an appropriate introduction that describes an essential content that briefly covers about the intent. After this, write different methods of how to monitor your child and observe them effectively. It is always important to provide methodology while observing someone as it helps the readers to understand it effectively. There should be a descriptive measure that helps in understanding why observing a child is important at the end of it, it is required to summarize all the essential points. The language that has been used in this should be concise and crispy to hold your reader’s attention.

If you are writing on any scientific project, it is important to write a descriptive introduction and introduce each and every scientific procedure in a precise and simplified language that can be understood by anybody. Unlike other observations, scientific observation requires an in-depth knowledge of scientific procedures, their effects and what results to such an output. In such type of essays, writers need to inform their audience when the particular project starts and what departments are associated with it. The merits and demerits of the project and a reference of its use in future needs to be referred.  At the end of the essay, it is required to write an observation remark at the instance.

Some observatory remark embarks personal review of the experts. It helps in getting necessary input from an expert that helps in framing an essay in an effective way. Expert’s reference or quotation provides in-depth knowledge about the object and it helps in representing an authentic reference point.

It is important to go through the observatory report issued by the employers or views given by any management analyst as it helps in a great way and gives necessary inputs on how to write an observation essay.

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