On 2016-04-05 17:36:49 +0300, Alexander Korotkov wrote:
> Could the reason be that we're increasing concurrency for LWLock state
> atomic variable by placing queue spinlock there?

Don't think so, it's the same cache-line either way.

> But I wonder why this could happen during "pgbench -S", because it doesn't
> seem to have high traffic of exclusive LWLocks.

Yea, that confuses me too. I suspect there's some mis-aligned
datastructures somewhere. It's hard to investigate such things without
access to hardware.

(FWIW, I'm working on getting pinunpin committed)


Andres Freund

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