On Sun, 22 Mar 2009, Matt Domsch wrote: > On Sat, Mar 21, 2009 at 10:26:21PM -0500, Mike McGrath wrote: > > What am I missing here? This happened on db3 again - > > > > total used free shared buffers cached > > Mem: 18480632 18383512 97120 0 25968 17305332 > > -/+ buffers/cache: 1052212 17428420 > > Swap: 3145720 3145720 0 > > > > > > 1) This box was swapping out like crazy. > > > > 2) All swap was full > > > > 3) oomkiller didn't start > > > > 4) Load went up a little bit, topped out at 3 > > > > 5) no issues with the box at all, has postgres on it, kept running, wasn't > > slow, box was completely responsive. > > > > 6) It's done this before, and aside from nagios alerting us the swap was > > full, not had any issues with the box. > > There are ~30 postgres processes running, many with RSS > 1.6GB, and > nearly all marked idle. If these processes aren't actively running, > they each can get swapped out to free memory for use by the page > cache. The page cache is consuming 17GB, which it's free to do if no > applications are actually _running_ that need more memory. The > processes that are running and touching the database will cause those > disk accesses to get cached in the page cache. > Very interesting, I didn't realize that RSS could be swapped out for page cache on apps that weren't in the run state. -Mike _______________________________________________ Fedora-infrastructure-list mailing list Fedora-infrastructure-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-infrastructure-list
