Обсуждение: Suspicious top output
Hello, i have a postgresql server running and from time to time it gets painfully slow. When this happens i usually connect to the server and run a "top" command, the output i get is filled with lines like the following 71872 pgsql 1 4 0 48552K 42836K sbwait 1:41 4.79% postgres Are those connections that were not closed or something like that? should i worry? Thanks in advance, as always yours trully Rafael
Rafael Barrera Oro wrote: > Hello, i have a postgresql server running and from time to time it gets > painfully slow. When this happens i usually connect to the server and > run a "top" command, the output i get is filled with lines like the > following > > 71872 pgsql 1 4 0 48552K 42836K sbwait 1:41 4.79% > postgres > > Are those connections that were not closed or something like that? This looks like FreeBSD; "sbwait" state is socket buffer wait, and guessing from the CPU usage the process seems to be talking to another process. > should i worry? Don't know. Are you sure all client processes disconnect properly from the database?
On Tue, 22 Apr 2008, Rafael Barrera Oro wrote: > Hello, i have a postgresql server running and from time to time it gets > painfully slow. The usual information you should always include when posting messages here is PostgreSQL and operating system versions. > When this happens i usually connect to the server and run a "top" > command The other thing you should fire up in another window is "vmstat 1" to figure out just what's going on in general. The great thing about those is you can save them when you're done and easily analyze the results later easily, which is trickier to do with top. > 71872 pgsql 1 4 0 48552K 42836K sbwait 1:41 4.79% > postgres Some searching found this interesting suggestion from Darcy about things stuck in sbwait: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/performance/2004-03/0015.html -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD