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<H1>Re: Just a bit of musing</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: Re: Just a bit of musing</LI>
<LI><em>From</em>: <A HREF="mailto:claw#null,net">claw#null,net</A></LI>
<LI><em>Date</em>: Fri, 14 Mar 97 15:28:59 -0800</LI>
<LI><em>Reply-to</em>: <A HREF="mailto:claw#null,net">claw#null,net</A></LI>
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<PRE>
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...
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: Just a bit of musing</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00105" HREF="msg00105.html">Re: Just a bit of musing</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Thu 13 Mar 1997, 23:28 GMT
</LI>
<LI><strong><A NAME="00106" HREF="msg00106.html">Re: Just a bit of musing</A></strong>,
Wout Mertens <a href="mailto:Wout.Mertens#rug,ac.be">Wout.Mertens#rug,ac.be</a>, Thu 13 Mar 1997, 23:48 GMT
</LI>
<LI><strong><A NAME="00108" HREF="msg00108.html">Re: Just a bit of musing</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Fri 14 Mar 1997, 11:13 GMT
</LI>
<LI><strong><A NAME="00110" HREF="msg00110.html">Re: Just a bit of musing</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Fri 14 Mar 1997, 13:17 GMT
</LI>
<LI><strong><A NAME="00114" HREF="msg00114.html">Re: Just a bit of musing</A></strong>,
claw <a href="mailto:claw#null,net">claw#null,net</a>, Sat 15 Mar 1997, 07:53 GMT
</LI>
<LI><strong><A NAME="00115" HREF="msg00115.html">Re: Just a bit of musing</A></strong>,
claw <a href="mailto:claw#null,net">claw#null,net</a>, Sat 15 Mar 1997, 08:02 GMT
</LI>
<LI><strong><A NAME="00116" HREF="msg00116.html">Re: Just a bit of musing</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 15 Mar 1997, 10:54 GMT
</LI>
<LI><strong><A NAME="00117" HREF="msg00117.html">Re: Just a bit of musing</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sat 15 Mar 1997, 14:29 GMT
</LI>
<LI><strong><A NAME="00118" HREF="msg00118.html">Re: Just a bit of musing</A></strong>,
Travis Casey <a href="mailto:casey#NU,cs.fsu.edu">casey#NU,cs.fsu.edu</a>, Sat 15 Mar 1997, 21:20 GMT
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</UL></BLOCKQUOTE>
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