Re: Large memory application exhuasts buffers during write.

From: Denis Vlasenko
Date: Fri Mar 26 2004 - 05:49:06 EST

On Friday 26 March 2004 03:20, Robin Holt wrote:
> We have a large memory application which is being killed by the OOM
> killer.
> This is a 2.4 based kernel with many of the redhat patches applied.
> Before the application is started, there is approx 350GB of memory
> free according to top. When the app starts, it mallocs a 300GB
> buffer, initializes it, does computations into it, and then starts
> to write it to a disk file.
> What we see happen is the first approx 30GBs gets written and then
> swap starts getting utilized. Once swap has been heavily utilized,
> the OOM killer kicks in and kills the job.

How many swap do you have? What do you see in top?

> The application is a vendor provided app and probably cannot be
> modified. Does anybody have any suggestion on possible changes
> to make to the kernel to eliminate or significantly reduce the
> likelihood that the job gets terminated.
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