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c.f. bug 424647
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To: 'Denis Shcherbakov' <deniss@...>, gentoo-admin@g.o
From: "Ciaravino, Tido" <tciaravino@...>
Subject: RE: confine process on SMP system
Date: Fri, 20 Dec 2002 18:48:32 -0500
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<TITLE>RE: [gentoo-admin] confine process on SMP system</TITLE>
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<P><FONT SIZE=2>You can probably turn off hyperthreading in the BIOS</FONT>
<BR><FONT SIZE=2>(which would reduce your 4 virtual processors to two real)</FONT>
</P>

<P><FONT SIZE=2>What kernel are you using?</FONT>
<BR><FONT SIZE=2>&nbsp; See gentoo bugzilla bug 11095 (and vote for it!!!)</FONT>
</P>

<P><FONT SIZE=2>Hope this helps,</FONT>
</P>

<P><FONT SIZE=2>odiT</FONT>
</P>

<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Denis Shcherbakov [<A HREF="mailto:deniss@...">mailto:deniss@...</A>]</FONT>
<BR><FONT SIZE=2>Sent: Friday, December 20, 2002 5:50 PM</FONT>
<BR><FONT SIZE=2>To: gentoo-admin@g.o</FONT>
<BR><FONT SIZE=2>Subject: [gentoo-admin] confine process on SMP system</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=2>Hello,</FONT>
</P>

<P><FONT SIZE=2>Can someone tell me if it's possible to assign a certain task to a certain</FONT>
<BR><FONT SIZE=2>processor and keep it there (lock it)?</FONT>
</P>

<P><FONT SIZE=2>There is a C++ code that runs on my dual processor system (with</FONT>
<BR><FONT SIZE=2>hyperthreading).&nbsp; 4 processors are seen by Linux.&nbsp; When one instance of</FONT>
<BR><FONT SIZE=2>the code runs, everything is fine.&nbsp; When 2 instances, it is also ok.&nbsp; But</FONT>
<BR><FONT SIZE=2>when 3 or 4 instances of the code run simultaneously, they crash my</FONT>
<BR><FONT SIZE=2>machine.&nbsp; I think this is a scheduling issue.&nbsp; I have seen these processes</FONT>
<BR><FONT SIZE=2>jump to a different processor in the midst of execution.&nbsp; This could be a</FONT>
<BR><FONT SIZE=2>problem, if two processes collide.</FONT>
</P>

<P><FONT SIZE=2>What do you think is the best way to deal with such an issue?&nbsp; I only have</FONT>
<BR><FONT SIZE=2>this happen with the C++ code.&nbsp; When I ran 4 simultaneous instances of C</FONT>
<BR><FONT SIZE=2>code for 7 hours, the system remained stable.</FONT>
</P>

<P><FONT SIZE=2>Thanks in advance!</FONT>
<BR><FONT SIZE=2>Denis</FONT>
</P>
<BR>

<P><FONT SIZE=2>--</FONT>
<BR><FONT SIZE=2>gentoo-admin@g.o mailing list</FONT>
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Updated Jun 17, 2009

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