16 Dec
2013
16 Dec
'13
3:40 p.m.
From: Stephen Harris lists@spuddy.org
Having pages in swap is not indicative of a problem; what's more important is the level of swap _activity_. See "vmstat" output, for example, to determine how much swap activity is occuring. If that's zero then you're not throwing new pages out to swap.
Maybe unrelated but we ran into some NUMA memory allocation per cpu problem with our mysql servers. The swap would be used (up to 100%) while there was plenty of free RAM. Prefixing mysqld with "numactl --interleave all" seemed to fix it...
JD