On 10/10/05, S Destika <[EMAIL PROTECTED]> wrote: > Ok. On the SPEC benchmarks does JBB count as a good one to measure kernel > scalability? If so I posted a reply to barts above - Linux/IA-32 achieves 72% > of perfect scalability when going from 1 to 8 way. Solaris10/AMD64 (all 64bit > kernel, jvm, cpu) achieves 82% when going from 2-way to 4-way. Not apples to > apples but enough to prove the point that Linux scalability isn't bad at all. >
I'm a little fuzzy on numbers here but does that mean that a four way machine will be 28% idle? Which means one processor doing nothing? Or does it imply that there were application throughput measurments and the four way result was only 72% of the expected 400% increase from 1 to 4 CPU's? Truth is .. I don't know. I do know that a 14 way E4500 can be really really loaded up like mad ( like 98% busy ) and there will be one proc that has really high context switching and handled interrupts while all the others seem busy with doing work. Seems like a master-worker_node arrangement with threads being handed around to worker CPUs by some master controlling CPU. Of course that was years ago. I am sure that Solaris 10 is better. Has there been an update to the Porsche book in a while? Any one know ? Dennis
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