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SubjectRe: [PATCH] Radix-tree pagecache for 2.5
On Wed, Feb 06, 2002 at 09:44:33AM -0200, Rik van Riel wrote:
> Once you get over 'dbench 16' or so the whole thing basically
> becomes an excercise in how well the system can trigger task
> starvation in get_request_wait.

It's neat you've identified that bottleneck.

dbench 192 also appears to trigger more swapin/swapout than
usual with rmap based kernels about 12-15 minutes into the test;
and it remains unusually high for the duration of the run.
(not a huge amount of swapping, but vmstat 60 shows double digit
numbers, rather than the more typical 0 with occasional single
digits "spikes"). dbench 64 doesn't trigger this behavior on
my test box.

I want diversity in the workloads. bonnie++ does a single
thread, and tiobench is doing 1, 2, 4, and 8 threads. dbench
fits in well at the other end of the spectrum.

The newest bench added to the lineup is OSDB on postgresql.
If everything executes properly, 2.5.3-dj3 (which includes
radix-tree) will win the first timer award for OSDB. :)

Randy Hron

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