On Thu, Sep 5, 2013 at 09:13:23PM +0200, Andres Freund wrote:
> Hi,
>
> Heikki's catcache rehashing stuff reminded me that I'd posted an
> optimization to catcache (20121220153555.GH4303@awork2.anarazel.de) some
> time back which I didn't have energy to pursue at that point.
>
> I've brushed the patch up a bit and verified it still gives be a
> performance improvement. It's still about 2% in a readonly pgbench on my
> elderly laptop.
>
> There's basically two tricks in the patch:
> 1) Don't always copy the cache's ScanKey to the stack. Instead pass
> an array of arguments around. That get's rid of a good amount of
> memcpy()ing in the common, cached case.
> 2) If we have to memcpy() because we need to pass a ScanKey to
> systable_*, copy only cache->cc_nkey * sizeof(ScanKeyData) instead of
> always copying the maximum size.
>
> I'd be nicer to get rid of the mostly copied HeapKeyTestArg, but I don't
> immediately see how.
Where are we on this?
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ Everyone has their own god. +
