Tomas,
> I forgot to answer this question: you can drop buffers and cache by
running
> echo 3 > /proc/sys/vm/drop_caches
Nice, even easier. Thanks!
The next question is - can this ever be done by a non-root user? I tried
adding /bin/echo to /etc/sudoers, but still get an error:
mike@lab153:~ $ sudo /bin/echo 3 > /proc/sys/vm/drop_caches
-bash: /proc/sys/vm/drop_caches: Permission denied
-Mike
On Thu, Jul 9, 2015 at 11:36 AM, Pavelka, Tomas <[email protected]>
wrote:
> > Thanks. I copied and pasted cmmflush and it seems to work nicely
>
> If I understand it right then you have to look at how cmmflush affects the
> output of /proc/buddyinfo. If you see non-zero in the last order of slab
> (i.e. the one with 1MB size) then you are good to run vmcp --buffer=1M.
> Otherwise you may still run into problems even if free -m shows a lot of
> free memory.
>
> But I have not tried cmmflush, maybe it will help.
>
> The way that I was able to reproduce the memory fragmentation problem was
> by copying large amount of data over SCP to that Linux machine. Try that
> and see if you can reproduce the vmcp --buffer=1M failure.
>
> Tomas
>
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