| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Matt Clarkson <mattc(at)catalyst(dot)net(dot)nz> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: 60 core performance with 9.3 |
| Date: | 2014-07-31 21:38:08 |
| Message-ID: | 20140731213807.GD5475@eldon.alvh.no-ip.org |
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| Lists: | pgsql-performance |
Matt Clarkson wrote:
> The LWLOCK_STATS below suggest that ProcArrayLock might be the main
> source of locking that's causing throughput to take a dive as the client
> count increases beyond the core count.
> Any thoughts or comments on these results are welcome!
Do these results change if you use Heikki's patch for CSN-based
snapshots? See
http://www.postgresql.org/message-id/539AD153.9000004@vmware.com for the
patch (but note that you need to apply on top of 89cf2d52030 in the
master branch -- maybe it applies to HEAD the 9.4 branch but I didn't
try).
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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