Messages in this thread | | | Date | Mon, 15 Jan 2001 21:49:16 +0100 (CET) | From | Mike Galbraith <> | Subject | Re: mmap()/VM problems in 2.4.0 |
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On 15 Jan 2001, Zlatko Calusic wrote:
> "Vlad Bolkhovitine" <vladb@sw.com.sg> writes: > > > Here is updated info for 2.4.1pre3: > > > > Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/sec > > > > with mmap() > > > > File Block Num Seq Read Rand Read Seq Write Rand Write > > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > > ------- ------ ------- --- ----------- ----------- ----------- ----------- > > . 1024 4096 2 1.089 1.24% 0.235 0.45% 1.118 4.11% 0.616 1.41% > > > > without mmap() > > > > File Block Num Seq Read Rand Read Seq Write Rand Write > > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > > ------- ------ ------- --- ----------- ----------- ----------- ----------- > > . 1024 4096 2 28.41 41.0% 0.547 1.15% 13.16 16.1% 0.652 1.46% > > > > > > Mmap() performance dropped dramatically down to almost unusable level. Plus, > > system was unusable during test: "vmstat 1" updated results every 1-2 _MINUTES_! > > > > You need Marcelo's patch. Please apply and retest.
My box thinks quite highly of that patch fwiw, but insists that he needs to apply Jens Axboes' blk patch first ;-) (Not because of tiobench)
-Mike
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