February 1997
- Its nice to be back Nathan Yospe
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- Just a bit of musing Nathan Yospe
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On 08/03/97 at 09:41 AM, cg@ami-cg.GraySage.Edmonton.AB.CA (Chris Gray)
said:
>>Well, given an SMP machine, with an OS that will intelligently
>>distributes threads -- that all semi happens for free with me (its not
>>quite so good as I try to minimise thread creations, as few to no
>>current OS'es will migrate a thread across processors for load sharing).
>Huh? As far as I know, all SMP OS's will readily run a runnable thread on
>whatever CPU is free in the SMP. Solaris, AIX4, HPUX all do this, and I
>have no reason to believe any other wouldn't as well. Are you suggesting
>that once a thread in a process has run on a given CPU, it is somehow
>bound to that CPU for execution? If so, can you point me at some docs
>that say this - it could be quite significant for us at work.
I phrased the above incorrectly. I'll try to clarify.
I am not aware of a MT SMP OS which will migrate an already started thread
between CPU's. Yes, this means that once you start the thread, it is
assigned to a CPU, and there it will stay until it dies. Note: I don't
have any supporting documentation, but I recall early docs from Cutler and
the Hursley guys mentioning this and the base reasons.
I suggest querying your MT SMP OS vendor.
The base problem with what I wrote above is that the reasoning is crap. I
minimise thread creations because they are expensive. What I should have
written with corrections in [squares]:
>>Well, given an SMP machine, with an OS that will intelligently
>>distributes threads -- that all semi happens for free with me (its not
>>quite so good as I try to minimise thread creations, [which] as few to no
>>current OS'es will migrate a thread across processors for load sharing,
>> [doesn't necessarily gain me much]).
I have slated at some point a touch that will preferentially kill older
threads as vs newer threads with the idea being that newer threads are
more likely to have been allocated to a currently free CPU. Of course its
not really true, but what the heck. I haven't thought of a better/cheaper
approach.
--
J C Lawrence Internet: coder@null.net
----------(*) Internet: coder@ibm.net
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith... - Just a bit of musing Chris Gray
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- Quadtrees? Wout Mertens
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- Quadtrees? Greg Munt
- Quadtrees? Ola Fosheim Grøstad
- Quadtrees? Ling
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- Quadtrees? Carter T Shock
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