Nick Lunt wrote:
[...]
thanks for the c prog, with that I proved that swap does work.
With the system under stress here are the settings you asked for:
[r...@psl-cu ~]# sysctl -q vm.overcommit_memory
vm.overcommit_memory = 0
[r...@psl-cu ~]# sysctl -q vm.overcommit_ratio
vm.overcommit_ratio = 50
What I have noticed is when I stress the system (whilst using hugepages
and memlock ulimit) the system will never swap, I have tried with
different valued for hugepages and memlock with no luck. The only way to
get the system to swap is to:
a. turn off hugepages and memlock
b. leave hugepages on but turn off memlock, however the system soon
freezes after doing this.
Nick, I do not have a lot of experience with Oracle, but my guess is
maybe your Oracle apps use mostly the hugepage memory or maybe they have
not used a lot of the rest of your memory, which is up to 10G ?
When you do your stress tests, check values of Committed_AS in
/proc/meminfo see if it is close to CommitLimit. I think when they are
close, you can see swap usage becomes more active and then cached memory
reduces quickly.
Vu
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