16 mutext lock/unlocks per query?
raj at cup.hp.com
Wed Dec 5 21:52:49 UTC 2001
> TSI is my generic term for "test and set interlocked", which means
> some instruction or sequence of instructions that's guaranteed to
> succeed for only one thread regardless of cache pipelines or number of
OK, for PA-RISC that would be load anc clear word (LDCW). There is
either a test and set or fetch and add or somesuch in IPF, which I'm
confident is being used by the pthread_mutex_lock calls.
> > The profile should show the syscall stubs for when those things were
> > called. As I recall, that was rather rare.
> so the lost processor time is all function call overhead unless your
> TSI has to empty the cache pipelines rather than snooping them.
I'm reasonably certain that the instruction does not have to flush the
Wisdom Teeth are impacted, people are affected by the effects of events.
these opinions are mine, all mine; HP might not want them anyway... :)
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