higher speed mutexes
Petri Helenius
pete at he.iki.fi
Thu Jan 6 09:15:59 GMT 2005
David Xu wrote:
> I will have low overhead pthread library available soon, for
> simple mutex, it is only an atomic_cmpset_long() plus a function
> call (pthread_mutex_lock) overhead.
>
Sounds great. Will this change the performance of rwlocks or is simple
mutex preferred for performance sensitive applications?
Is this something that I could drop on top of RELENG_5 or RELENG_5_3 or
is CURRENT required?
Do you have this in some public depository already?
Pete
> David Xu
>
> Petri Helenius wrote:
>
>>
>> Hi,
>>
>> I have some low-contention mutexes which I'm trying to make perform
>> better and I'm wondering if the current threading library does have
>> some primitives I could use or if I'm better off using
>> atomic_cmpset_* and pthread_yield() if the thread hit's contention
>> (which should be about 1:10000 of the lock/unlock operation).
>>
>> Any scheduling caveats from above, except obviously it would spin
>> while waiting for the lock. Most systems I plan on running this on
>> have dual-hypethreading CPU's.
>>
>> I remember there were some discussion about dropping i386 compatible
>> support for mutexes and using atomic operations instead. Is there
>> code/compile time options for this on a branch I could check out and
>> give it a spin?
>>
>> Pete
>>
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>
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