Messages in this thread | | | Date | Tue, 04 Jun 2002 18:10:25 -0700 | From | Hanna Linder <> | Subject | Re: Lockstats for SMP DB Workload |
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--On Tuesday, June 04, 2002 17:16:46 -0700 Ruth Forester <lilo@us.ibm.com> wrote:
> Everyone, > > I am running with the following configuration > > 2.4.19pre8aa2+dj2+ (dj2 removes global semaphore_lock spinlock) > +fast_walkA3-2_4_19-pre8_patch. > > The database is set up to use raw-io, yet looking at this data, it appears that > I am still hitting a lot of filesystem accesses, among other things. This is an > oltp workload, although there are some contentions (pread?) that cause the > cpu sys time to go to 99%, it was during this part of the "workload" that this > snapshot of lockmeter was taken. >
> SPINLOCKS HOLD WAIT > UTIL CON MEAN( MAX ) MEAN( MAX )(% CPU) TOTAL NOWAIT SPIN RJECT NAME > > 6.7% 2.5us( 25ms) 62us( 12ms)( 6.8%) 2650959 93.3% 6.6% 0.05% *TOTAL* > > 2.4% 1.0% 38us( 15ms) 3185us( 12ms)(0.13%) 6291 99.0% 1.0% 0% kernel_flag_cacheline > 2.3% 9.1% 6865us( 15ms) 3551us(5592us)(0.01%) 33 90.9% 9.1% 0% do_exit+0xf4
Dave Hanson has a do_exit patch you might want to look at...
Hanna
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