| From: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | mark(at)mark(dot)mielke(dot)cc, Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>, PGSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: New CRC algorithm: Slicing by 8 |
| Date: | 2006-10-23 05:20:54 |
| Message-ID: | 453C5136.1060004@paradise.net.nz |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
>
>
> Yah, I checked. Several times... but if anyone else wants to repeat
> the experiment, please do. Or look for bugs in either my test case
> or Gurjeet's.
FWIW - FreeBSD and Linux results using Tom's test program on almost
identical hardware[1]:
Std crc Slice-8 crc
Intel P-III 1.26Ghz (FreeBSD 6.2)
8192 bytes 12.975314 14.503810
1024 bytes 1.633557 1.852322
64 bytes 0.111580 0.206975
Intel P-III 1.26Ghz (Gentoo 2006.1)
8192 bytes 12.967997 28.363876
1024 bytes 1.632317 3.626230
64 bytes 0.111513 0.326557
Interesting that the slice-8 algorithm seems to work noticeably better
on FreeBSD than Linux - but still not as well as the standard one (for
these tests anyway)...
Cheers
Mark
[1] Both boxes have identical mobos, memory and CPUs (same sspec nos).
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