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Article #2583Re: [SS20] Mixing two CPUs
From: Scott Howard
Date: Thu, 02 Oct 2003 17:06
Date: Thu, 02 Oct 2003 17:06
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In aus.computers.sun The One4Sun - GWS <one4sun@lios.apana.org.au> wrote: >>The only real negative aspect of doing this is that Solaris assumes >>all processors are equal for purposes of scheduling, so CPU scheduling >>priorities may be slightly sub-optimal. > > Perhaps there is a way to tweak the way each CPU is indexed for scheduling > purposes but it would not be a very good idea to be fiddling with timing > factors in software as the complexity of the kernel code would no doubt > increase significantly. Yup, and it's all been in there since about Solaris 8. This is the Solaris scheduler we're talking about here, not that crappy Linux thing :) Solaris 8 and 9 have full support for scheduling onto different speed CPUs, although exactly how "intelligently" they do it is debatable, but it does try to be smart about it (being more intelligent needs more clock cycles, so it's a compromise) Newer version of 9 even include features to allow things like running a process "near" to it's memory to improve performance - although this is only an issue on the ccNUMA machines. Of course, I'd be fairly certain that none of this is done on SS20... :) Scott
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From: Scott Howard <scott@hunterlink.net.au>
Newsgroups: comp.sys.sun.hardware,aus.computers.sun,uk.comp.sys.sun
Subject: Re: [SS20] Mixing two CPUs
Date: 2 Oct 2003 17:06:14 GMT
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