Re: [PATCH] pgbench --throttle (submission 7 - with lag measurement)
От | Fabien COELHO |
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Тема | Re: [PATCH] pgbench --throttle (submission 7 - with lag measurement) |
Дата | |
Msg-id | alpine.DEB.2.02.1307180950310.3991@localhost6.localdomain6 обсуждение исходный текст |
Ответ на | Re: [PATCH] pgbench --throttle (submission 7 - with lag measurement) (Tatsuo Ishii <ishii@postgresql.org>) |
Список | pgsql-hackers |
Hello again Tatsuo, > For your information, included is the patch against git master head to > implement the lag in a way what I proposed. With the patch, I get more > consistent number on Linux (and Mac OS X). I must disagree with your proposal: At least, it does not provide the information I want, but another one. ISTM that this patch measures the lag which is due to pgbench thread coming around to deal with a transaction after sleeping. I would expect that to be quite small most of the time, so I agree that it must be reassuringly consistent. However it does not provide the information I want, which is the measure of the health of pgbench with respect to the stochastic process scheduled transactions. Basically you propose a partial lag measure, which will be smaller, but which does not tell whether pgbench is able to follow the schedule, which is the information I find useful in this context to appreciate if the throttling is going well. -- Fabien.
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