ULE vs. 4BSD scheduler benchmarks
ivoras at freebsd.org
Mon Jan 30 14:01:36 UTC 2012
On 28/01/2012 23:40, Florian Smeets wrote:
> The conclusion right now seems to be that ULE is faster for database
I've done the same benchmarks with Bullet Cache last year and 4BSD is
*ridiculously* inefficient and slow for this specific workload which
involves a lot of inter-thread and inter-process communications. The
results were somewhere in the ratio of 1:10 in favor of ULE.
>but for strongly CPU-bound workloads 4BSD can be a better
> choice. I can provide KTR traces and/or schedgraph output for cases
> where 4BSD is better than ULE.
Can you try manually bind processes to CPUs with the CPU-heavy
benchmark? This could be a bit hard if you use the regular pbzip2
because it spawns threads, but if you manually spawn 8 CPU-bound
processes (with cpuset(1)) in parallel and measure that, it would be useful.
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