Messages in this thread | | | From | "Al Boldi" <> | Subject | RE: Kernel doesn't free Cached Memory | Date | Tue, 26 Jul 2005 08:23:19 +0300 |
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Bill Davidsen wrote: { Al Boldi wrote: > Dick Johnson wrote: { > >>On Fri, 2005-07-22 at 08:27 -0300, Vinicius wrote: >>[...] >> >>> I have a server with 2 Pentium 4 HT processors and 32 GB of RAM, >>>this server runs lots of applications that consume lots of memory to. >>>When I stop this applications, the kernel doesn't free memory (the >>>memory still in use) and the server cache lots of memory (~27GB). >>>When I start this applications, the kernel sends "Out of Memory" >>>messages and kill some random applications. > > > ...you might even need to turn memory over-commit off: > echo "0" > /proc/sys/vm/overcommit_memory > } > > That's in 2.4. In 2.6 it's: > echo "2" > /proc/sys/vm/overcommit_memory
RHEL3 *is* a 2.4 kernel. > > But the kernel doesn't honor no-overcommit in either version, i.e. it still > overcommits/pages-out loaded/running procs, thus invoking OOM! > > Is there a way to make the kernel strictly honor the no-overcommit request? >
Don't have swap? }
Turn off swap and things get worse!
Paolo Ornati wrote:{ Bill Davidsen <davidsen@tmr.com> wrote: > And IMHO Linux is *way* too willing to evicy clean pages of my > programs to use as disk buffer, so that when system memory is full I > pay the overhead of TWO disk i/o's, one to finally write the data to > the disk and one to read my program back in. If free software is > about choice, I wish there was more in the area of how memory is > used.
isn't this tuned enough by "/proc/sys/vm/swappiness" ? }
Swappiness tunes but does not inhibit overcommit!
So the question remains: Why Is there no way to make the kernel _strictly_ honor the no-overcommit request?
-- Al
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