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Re: ULE/SCHED_SMP diff for 7.0
- To: "Eric Anderson" <anderson_(_at_)_freebsd_(_dot_)_org>
- Subject: Re: ULE/SCHED_SMP diff for 7.0
- From: "Claus Guttesen" <kometen_(_at_)_gmail_(_dot_)_com>
- Date: Tue, 17 Jul 2007 15:18:43 +0200
- Cc: current_(_at_)_freebsd_(_dot_)_org
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>> This patch is scheduled for inclusion in 7.0. I would like anyone who
>> cares to run it to validate that it does not create any stability or
>> performance regression over the existing ULE. This patch replaces ULE
>> with SCHED_SMP, which will now no longer exist as a seperate fork of ULE.
> Not very scientific nor precise but using 4bsd as scheduler 'make -j 3
> buildkernel' completed in 11 min. 58 secs. and ule did the same in 13
> min. 26 secs. So ule seems slower. This is on a dual zeon @ 3.2 Ghz
> (the first 64-bit from Intel, not very fast but hot) and 3 GB ram and
> 15 RPM scsi-disk with /usr on zfs.
Ahah! 15 RPM drives, no wonder! :)
On a serious note, can you do that same test, with '-j 4' or higher? I
think you can easily do two per processor, at least that's what I do on
a Core 2 Duo.
-j 3 buildkernel: 13:23
-j 4 buildkernel: 12:38
-j 5 buildkernel: 12:41
-j 6 buildkernel: 12:47
-j 3 buildkernel: 11:43
-j 4 buildkernel: 12:02
So sched_ule seems to handle more processes slightly better than 4bsd
albeit it does it slower. ule's sweet spot is -j 4 and 4bsd is -j 3.
When lenity and cruelty play for a kingdom,
the gentlest gamester is the soonest winner.
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