On an Intel Xeon dual CPU machine running 2.6.16 and up...
I have two highly CPU/memory/network intensive processes with 3-5
threads each. I am using sched_setaffinity calls to make sure these two
processes never compete for the same physical CPU. Am I right to assume
that CPU #0 and #1 vs CPU #2 and #3 are separate physical CPUs on a
2-CPU w/ hyperthreading box?
I've spent some time looking, but I did not find documentation on
exactly how CPUs are numbered in a hyperthreaded box.
For a process with N threads where N is generally <=5, where each thread
shares access to the same large (300Mb) data structure across several
threads, and which pumps the data from memory to a TCP socket, making
many futex, select, write(), send() network calls (but no disk I/O), I
assume it is best to keep said process on the same physical CPU but
allow use both logical processors on that CPU (vs. keeping it to a
single logical CPU)?
Thanks,
A.
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