Пятница, 4 января 2013, 0:42 -07:00 от Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>:
>On Thu, Jan 3, 2013 at 4:45 PM, nobody nowhere < devnull(at)mail(dot)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