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Linux
Gentoo
Linux FAQ Items
Post 302088226 by prashant_ohol on Sunday 10th of September 2006 05:02:25 PM
09-10-2006
Linux FAQ Items
Hello Guys,
Sometimes it is necessary to add more swap space after installation. For example, you may upgrade the amount of RAM in your system from 64 MB to 128 MB, but there is only 128 MB of swap space. It might be advantageous to increase the amount of swap space to 256 MB if you perform memory-intense operations or run applications that require a large amount of memory.
You have two options: add a swap partition or add a swap file. The easiest way to achieve this it to through swap file.
To add a swap file:
Determine the size of the new swap file and multiple by 1024 to determine the block size. For example, the block size of a 64 MB swap file is 65536.
At a shell prompt as root, type the following command with count being equal to the desired block size:
dd if=/dev/zero of=/swapfile bs=1024 count=65536
then
mkswap /swapfile
To enable the swap file immediately but not automatically at boot time:
swapon /swapfile
To enable it at boot time, edit /etc/fstab to include:
/swapfile swap swap defaults 0 0
The next time the system boots, it will enable the new swap file.
After adding the new swap file and enabling it, make sure it is enabled by viewing the output of the command cat /proc/swaps or free.
bingo
Let me know if you have any questions.
Prashant,
prashant ohol - System Administrator,
Sometimes it is necessary to add more swap space after installation. For example, you may upgrade the amount of RAM in your system from 64 MB to 128 MB, but there is only 128 MB of swap space. It might be advantageous to increase the amount of swap space to 256 MB if you perform memory-intense operations or run applications that require a large amount of memory.
You have two options: add a swap partition or add a swap file. The easiest way to achieve this it to through swap file.
To add a swap file:
Determine the size of the new swap file and multiple by 1024 to determine the block size. For example, the block size of a 64 MB swap file is 65536.
At a shell prompt as root, type the following command with count being equal to the desired block size:
dd if=/dev/zero of=/swapfile bs=1024 count=65536
then
mkswap /swapfile
To enable the swap file immediately but not automatically at boot time:
swapon /swapfile
To enable it at boot time, edit /etc/fstab to include:
/swapfile swap swap defaults 0 0
The next time the system boots, it will enable the new swap file.
After adding the new swap file and enabling it, make sure it is enabled by viewing the output of the command cat /proc/swaps or free.
bingo
Let me know if you have any questions.
Prashant,
prashant ohol - System Administrator,
Last edited by prashant_ohol; 09-11-2006 at 04:50 PM..
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LEARN ABOUT HPUX
swapmem_on
swapmem_on(5) OBSOLETE swapmem_on(5) NAME
swapmem_on - OBSOLETE kernel tunable parameter DESCRIPTION
The tunable is obsolete. Processes will always be allowed to use pseudo-swap space if it is available. In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on the system. This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be killed due to insufficient swap. This was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where the entire load would always be in core. This tunable was created to allow system swap space to be less than core memory. To accomplish this, a portion of physical memory is set aside as "pseudo-swap" space. While actual swap space is still available, processes still reserve all the swap they will need at fork or execute time from the physical device or file system swap. Once this swap is completely used, new processes do not reserve swap, and each page which would have been swapped to the physical device or file system is instead locked in memory and counted as part of the pseudo-swap space. WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. Tunable Kernel Parameters swapmem_on(5)