Re: Performance degradation in commit ac1d794

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Васильев Дмитрий <d(dot)vasilyev(at)postgrespro(dot)ru>
Cc: Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Performance degradation in commit ac1d794
Date: 2015-12-25 18:10:23
Message-ID: 19322.1451067023@sss.pgh.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

=?UTF-8?B?0JLQsNGB0LjQu9GM0LXQsiDQlNC80LjRgtGA0LjQuQ==?= <d(dot)vasilyev(at)postgrespro(dot)ru> writes:
> Samples: 1M of event 'cycles', Event count (approx.): 816922259995, UID:
> pgpro
> Overhead Shared Object Symbol

> 69,72% [kernel] [k] _raw_spin_lock_irqsave
> 1,43% postgres [.] _bt_compare
> 1,19% postgres [.] LWLockAcquire
> 0,99% postgres [.] hash_search_with_hash_value
> 0,61% postgres [.] PinBuffer

Seems like what you've got here is a kernel bug.

regards, tom lane

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Andres Freund 2015-12-25 18:20:26 Re: Performance degradation in commit ac1d794
Previous Message Tom Lane 2015-12-25 18:05:25 Re: MergeAttributes type (mod) conflict error detail