| 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 |
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=?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
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