Re: High SYS CPU - need advise
| От | Vlad |
|---|---|
| Тема | Re: High SYS CPU - need advise |
| Дата | |
| Msg-id | CAKeSUqXc_2A4tPrAVJ-uSw1wdbt9_ZQprboLGiWL-xodt5=aZA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: High SYS CPU - need advise (John R Pierce <pierce@hogranch.com>) |
| Список | pgsql-general |
I just did a little experiment: extracted top four queries that were executed the longest during stall times and launched pgbench test with 240 clients. Yet I wasn't able to put the server into a stall with that. Also load average was hitting 120+, it was all user cpu, single digit % system. The system remained pretty responsive (on a keypress), in contrary to when high-sys-cpu stall happens, showing similar LA numbers.
-- Vlad
This makes me think that there is probably a different (than ones I tried) query or condition that is responsible for creating high-sys-cpu. Also, from my limited knowledge of postgresql and kernel internals, this experiment puts under question idea that linux scheduler might be the corner stone....
Here is a longer log, first column is PID. High-sys-cpu stall happened around 10:42:37
I'll try to put pgbouncer in place and repeat, also though this will take longer time to setup.
-- Vlad
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