________________________________ > From: devnull@xxxxxxx > To: pgsql-performance@xxxxxxxxxxxxxx > Subject: Re[2]: [PERFORM] SMP on a heavy loaded database > Date: Fri, 4 Jan 2013 18:41:25 +0400 > > > > > Пятница, 4 января 2013, 0:42 -07:00 от Scott Marlowe > <scott.marlowe@xxxxxxxxx>: > On Thu, Jan 3, 2013 at 4:45 PM, nobody nowhere > <devnull@xxxxxxx<http://sentmsg?compose&To=devnull%40mail.ua>> wrote: > > Centos 5.X kernel 2.6.18-274 > > pgsql-9.1 from pgdg-91-centos.repo > > relatively small database 3.2Gb > > Lot of insert, update, delete. > > > > I see non balanced _User_ usage on 14 CPU, exclusively assigned to > the hardware raid controller. > > What I'm doing wrong, and is it possible somehow to fix? > > > > Thanks in advance. > > > > Andrew. > > > > # top -d 10.00 -b -n 2 -U postgres -c > > > > top - 23:18:19 up 453 days, 57 min, 3 users, load average: 0.55, 0.47, 0.42 > > Tasks: 453 total, 1 running, 452 sleeping, 0 stopped, 0 zombie > > Cpu0 : 0.6%us, 0.1%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu3 : 1.2%us, 0.1%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu4 : 2.6%us, 0.4%sy, 0.0%ni, 96.8%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st > > Cpu5 : 0.8%us, 0.0%sy, 0.0%ni, 99.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu6 : 5.4%us, 0.2%sy, 0.0%ni, 94.2%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu7 : 3.3%us, 0.4%sy, 0.0%ni, 96.1%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st > > Cpu8 : 1.4%us, 0.3%sy, 0.0%ni, 98.2%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st > > Cpu9 : 0.0%us, 0.1%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu10 : 0.0%us, 0.1%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu11 : 1.6%us, 0.6%sy, 0.0%ni, 97.4%id, 0.0%wa, 0.0%hi, 0.4%si, 0.0%st > > Cpu12 : 0.5%us, 0.1%sy, 0.0%ni, 99.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu13 : 1.4%us, 0.2%sy, 0.0%ni, 98.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > > Cpu14 : 24.2%us, 0.8%sy, 0.0%ni, 74.5%id, 0.3%wa, 0.0%hi, 0.2%si, 0.0%st > > Cpu15 : 0.7%us, 0.1%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.1%hi, 0.1%si, 0.0%st > > Mem: 16426540k total, 16356772k used, 69768k free, 215764k buffers > > Swap: 4194232k total, 145280k used, 4048952k free, 14434356k cached > > > > So how many concurrent users are accessing this db? pgsql assigns one > process on one core so to speak. It can't spread load for one user > over all cores. > 64 php Fast-cgi processes over the Unix socket and about 20-30 over tcp Are you running IRQ Balance ? The OS can pin process to the respective IRQ handler. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
