SWAP Partition

[In-f3st]

I would like to ask the members of the forum and Raymond if you could post all your knowledge about making SWAP partitions.
Of course, Windows XP is the OS.
Size, how to calculate, positive/negative effects etc...

All info will be apriciated.
Please don't link to sites and articles, unless they are really good cause I googled most of it.

[prashanthpai]

I don't get it. SWAP is used in linux. Are you referring to page file ?

I don't know about size. But moving your page file to another non-OS HDD will improve performance. It's a different HDD ( must be internal) and not a different partition. Setting the paging files initial size and maximum size to the same value increases efficiency because the operating system does not need to expand the file during processing. Setting different values for initial and maximum size can contribute to disk fragmentation.

[In-f3st]

Well, yeah I am not talking about Linux.
Win SWAP partitioning. I used it for some time but after I reformatted my PC I made the same SWAP partition but then I got hangtime while opening .exe files and programs.

So all I want you to post is your experience

[prashanthpai]

The paging file (Pagefile.sys) is a hidden file on your computer's hard disk that Windows XP uses as if it were random access memory (RAM). The paging file and physical memory make up virtual memory. By default, Windows stores the paging file on the boot partition (the partition that contains the operating system and its support files). The default paging file size is equal to 1.5 times the total RAM. However, this default configuration may not be optimal in all cases. This article discusses how to configure the paging file for system optimization and recovery.

To enhance performance, it is good practice to put the paging file on a different partition and on a different physical hard disk drive. That way, Windows can handle multiple I/O requests more quickly. When the paging file is on the boot partition, Windows must perform disk reading and writing requests on both the system folder and the paging file. When the paging file is moved to a different partition, there is less competition between reading and writing requests.

However, if you remove the paging file from the boot partition, Windows cannot create a dump file (Memory.dmp) in which to write debugging information in the event that a kernel mode Stop Error message occurs. This could lead to extended downtime if you must debug to troubleshoot the Stop error message.

The optimal solution is to create one paging file that is stored on the boot partition, and then create one paging file on another partition that is less frequently accessed on a different physical hard disk if a different physical hard disk is available. Additionally, it is optimal to create the second paging file so that it exists on its own partition, with no data or operating-system-specific files. By design, Windows uses the paging file on the less frequently accessed partition over the paging file on the more heavily accessed boot partition. An internal algorithm is used to determine which paging file to use for virtual memory management.

When you put a paging file on its own partition, the paging file does not become fragmented, and this counts as another definite advantage. If a paging file resides on a partition that contains other data, it may experience fragmentation as it expands to satisfy the extra virtual memory that is required. An unfragmented paging file leads to faster virtual memory access and to a greater chance of a dump-file capture that is free of significant errors.

There is no indication of optimal size. I too want to know that.

[Raymond]

Here's something about PageFile.
http://www.raymond.cc/blog/archives/2007/10/17/is-it-safe-to-delete-hiberfilsys-and-pagefilesys/

[In-f3st]

Well, yeah that is what I mostly know. I somehow want more info.
The last time I had the SWAP I noticed a slight performance increase, but now it resulted in constant hangtime.

So I need some info or someone who experimented with this.
What I did, is made a partition, and put the pagefile with manualy calculted size (min-max) so Windows wouldn't have to cache the files randomly on the C partition.
This is what I heard about it so I may be wrong, but SWAP partitions will make it easier for Windows to use RAM and this will result in a performance increase.