Subject: Re: Lock benchmarks
To: Gregory McGarry <>
From: None <>
List: tech-kern
Date: 09/17/2002 09:10:12
> I've placed a benchmark program at
> to test the performance of different userlevel locking schemes.
> It compares RAS locks and CPU locks (inlined and not).  All CPUs
> (except SH5) should now support CPU locks so the benchmark should
> compile OK for all machines.  A recent -current should be OK.
> RAS kernel support for your CPU isn't required.
> I'd appreciate receiving the timings on different CPUs.  I guess
> the results are somewhat academic since there is marginally any
> difference between the locking schemes.  But numbers are cool.
> The assembler routines will be the ones used in the pthread library
> if it is decided that RAS locks should be used by default on
> uniprocessor machines.  I guess the jury is still out on that one.


I'll give it a try on a AMD XP2000+ system tonight. Will data received be published? It would make interesting reading for some of us.

cheerio Berndt