Re: New SCHED_SMP diff.

From: Thomas Sparrevohn <Thomas.Sparrevohn_at_btinternet.com>
Date: Mon, 2 Jul 2007 19:56:00 +0100
On Monday 02 July 2007 17:50:44 Abdullah Ibn Hamad Al-Marri wrote:
> On 7/2/07, Jeff Roberson <jroberson_at_chesapeake.net> wrote:
> > I fixed a major bug in SCHED_SMP that impacted some users causing bad
> > performance and invalid load counts.  Attilio also added support for i386
> > based machines.  I have tested on UP which works although INVARIANTS and
> > WITNESS don't work properly on UP kernels.  Single processor SMP kernels
> > work fine.
> >
> > This diff also includes another patch that I intend to commit to current
> > which significantly improved write performance for mysql by removing
> > all use of Giant in fcntl().
> >
> > Please report any stability or performance problems with this patch.  The
> > more positive reports I get the more likely it will go into 7.0.
> >
> > Thanks,
> > Jeff
> 
> Jeff,
> 
> This makes my Intel C2D E6660 get really busy, and MySQL 5.0.41 from
> ports run faster :)
> 
> Thanks for making such great SCHED, when will you make it in the tree? :)
> 

Hmm - Weird it gives negative results on my C2D XQ6700 - I ran four 
tests using "make world" benchmark - I am using ZFS for all filesystems
except root - however I would not think that matters - I tested with "-j 8"
and "-j 4" but it did not change the overall result 


SCHED_SMP - rm -rf /usr/obj/* && /usr/bin/time -l make -j 4 buildworld

 1272.53 real      2482.83 user       945.08 sys
 1268.45 real      2483.46 user       950.95 sys
 1274.19 real      2481.91 user       953.19 sys
 1292.27 real      2482.59 user       957.37 sys

   2423814  voluntary context switches
    885934  involuntary context switches


SCHED_4BSD - rm -rf /usr/obj/* && /usr/bin/time -l make -j 4 buildworld

 1125.28 real      2675.17 user      1055.18 sys
 1124.74 real      2684.95 user      1057.64 sys
 1123.76 real      2678.64 user      1061.89 sys
 1120.68 real      2676.78 user      1061.03 sys


   2587885  voluntary context switches
    708274  involuntary context switches
Received on Mon Jul 02 2007 - 16:56:04 UTC

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