Re: How can I optimize a process on a NUMA architecture(x86-64 specifically)?

[Martin J. Bligh]

> Right now, 5 processes are running taking up a good deal of the CPU doing memory-intensive work(cacheing) and I notice that none of the processes seem to have CPU affinity.  top shows they execute pseudo randomly on the CPU's.
> 
> 
> At this point I'd like to decrease the number of processes to 4 and test performance with and without setting CPU & memory allocation affinity.
> 
> I've read the archives and I'm not sure how to get numactl running, both .5 and .6 versions give me:
> 
># numactl --show
> No NUMA support available on this system.
> 
> despite using kernel 2.6.6.
> 
> running numactl under strace gives me:
> 
> 32144 sched_getaffinity(32144, 16,  { 0 }) = 8
> 32144 syscall_239(0, 0, 0, 0, 0, 0, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30, 0x401e30) = -1 (errno 38)
> 32144 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 53), ...}) = 0
> 32144 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2a9556c000
> 32144 write(1, "No NUMA support available on thi"..., 42) = 42
> 32144 munmap(0x2a9556c000, 4096)        = 0
> 32144 exit_group(1)                     = ?
> 
> 
> In case someone might have ran into this before.

Did you turn on CONFIG_NUMA?

M.

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