Re: faster version of AllocSetFreeIndex for x86architecture

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Atsushi Ogawa <a_ogawa(at)hi-ho(dot)ne(dot)jp>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: faster version of AllocSetFreeIndex for x86architecture
Date: 2009-06-04 18:10:29
Message-ID: 1244139029.23910.235.camel@ebony.2ndQuadrant
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On Tue, 2009-06-02 at 23:53 +0900, Atsushi Ogawa wrote:

> I made a faster version of AllocSetFreeIndex for x86 architecture.

> Results of benchmark script:
> Xeon(Core architecture), RedHat EL4, gcc 3.4.6
> bytes : 4 8 16 32 64 128 256 512 1024 mix
> original: 0.780 0.780 0.820 0.870 0.930 0.970 1.030 1.080 1.130 0.950
> patched : 0.380 0.170 0.170 0.170 0.170 0.180 0.170 0.180 0.180 0.280

> The effect of the patch that I measured by oprofile is:
> - test program: pgbench -c 1 -t 50000 (fsync=off)
>
> original:
> CPU: P4 / Xeon with 2 hyper-threads, speed 2793.55 MHz (estimated)
> Counted GLOBAL_POWER_EVENTS events
> with a unit mask of 0x01 (mandatory) count 100000
> samples % symbol name
> 66854 6.6725 AllocSetAlloc

> patched:
> CPU: P4 / Xeon with 2 hyper-threads, speed 2793.55 MHz (estimated)
> Counted GLOBAL_POWER_EVENTS events
> with a unit mask of 0x01 (mandatory) count 100000
> samples % symbol name
> 47610 4.9333 AllocSetAlloc

> I think this patch improves AllocSetAlloc/AllocSetFree performance.

Looks like very good work. Much appreciated.

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support

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