topic Re: Cache Memory in Operating System - Linux

Cache Memory

Raju_S — Wed, 02 May 2007 08:23:36 GMT

Hi All,

Want to know how to clear the RAM Cache memory in Linux.

Thanks & Regards

Re: Cache Memory

Steven E. Protter — Wed, 02 May 2007 08:46:23 GMT

Shalom,

reboot.

SEP

Re: Cache Memory

Wouter Jagers — Wed, 02 May 2007 08:49:41 GMT

Hi,

Next to rebooting your machine, I don't think there's a way ;-)

The OS releases cache memory when more memory is needed by your processes, though, so there should be no need to worry.

Cheers,
Wout

Re: Cache Memory

Tobu — Thu, 03 May 2007 08:32:14 GMT

Would like to know why you want to clear cache ? Are you getting any cache error messages ? Does your system support hotswapable memory ?

Re: Cache Memory

Ivan Ferreira — Thu, 03 May 2007 09:25:12 GMT

Extrange question. You don't need to clear the cache/buffer as the OS handles this for you when memory is needed for applications.

Re: Cache Memory

Mike Stroyan — Thu, 03 May 2007 18:25:26 GMT

You probably don't really want to do that. But here is a script that will tend to clear out page cache. It fills the cache with the contents of a sparse file which is then removed.

#!/bin/sh
# Empty the file system cache.
# Use reading a sparse file to fill the cache with pages from the file.
# Then remove the file to release the pages from cache.

MemTotal=$(awk '/MemTotal/{print $2}' /proc/meminfo)
dd if=/dev/zero of=/tmp/sparsefile bs=1K count=1 seek=$MemTotal
dd if=/tmp/sparsefile of=/dev/null bs=1M
rm /tmp/sparsefile

Re: Cache Memory

Raju_S — Wed, 09 May 2007 01:15:10 GMT

Hi All,

Thanks for your response.

Regards