Re: high load on server

Hello Scott,

thanks for answering.

Scott Marlowe schrieb:
> 2009/4/3 Gerd König <koenig(at)transporeon(dot)com>:
>> Hello,
>>
>> since 2 days ago we're facing an increased load on our database server
>> (opensuse10.3-64bit, PostgreSQL 8.3.5, 8GB Ram). This high load stays the whole
>> working day.
>
> How man cores?

The server contains two
"model name : Intel(R) Xeon(R) CPU X5355 @ 2.66GHz"
CPU's, thereby 8 cores...

>
>> ==================
>> current situation:
>> ==================
>> #>top
>> top - 14:09:46 up 40 days, 8:08, 2 users, load average: 7.60, 7.46, 7.13
>> ...
>> Mem: 8194596k total, 5716680k used, 2477916k free, 185516k buffers
>> Swap: 4200988k total, 204k used, 4200784k free, 5041448k cached
>>
>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>> 17478 postgres 15 0 610m 455m 444m R 52 5.7 0:08.78 postmaster
>> 17449 postgres 15 0 606m 497m 489m S 37 6.2 0:16.35 postmaster
>> 22541 postgres 16 0 607m 522m 516m R 31 6.5 123:25.17 postmaster
>> 17491 postgres 15 0 618m 447m 435m S 22 5.6 0:03.97 postmaster
>> 17454 postgres 15 0 616m 474m 457m S 18 5.9 0:15.88 postmaster
>> 22547 postgres 15 0 608m 534m 527m S 18 6.7 100:12.01 postmaster
>> 17448 postgres 16 0 616m 517m 501m S 17 6.5 0:15.60 postmaster
>> 17451 postgres 15 0 611m 491m 479m S 11 6.1 0:25.04 postmaster
>> 17490 postgres 15 0 606m 351m 344m S 10 4.4 0:02.69 postmaster
>> 22540 postgres 15 0 607m 520m 513m S 2 6.5 33:46.47 postmaster
>> 17489 postgres 15 0 604m 316m 311m S 2 4.0 0:03.34 postmaster
>
> Next time hit c first to see what the postmasters are up to.

good hint, I'll perform this the next time the server runs under higher
load (probably on monday...)

>
>> I assume the problem is caused by heavy writing slows down the
>> server....?!?...why?=>
>
> The problem might be that you're assuming there's a problem. Looking
> at the rest of your diags, you're data set fits in memory, I/O wait is
> < 10% and there are no processes waiting for a CPU to free up, they're
> all running.
>
> Looks healthy to me.
Perfect, probably our customers didn't work that much in the past, but
now they do ;-)

kind regards...:GERD:...