schedulers binding error
Fri Mar 5 18:40:33 CET 2010
after compiling erlang on a itanium numa machine i cant use +sbt flag
No cpu topology is detected, after asking here and playing a bit I got:
erl +sct L0c0p0N0:L1c1p1N0:L2c2p2N1:L3c3p3N1:L4c4p4N2:L5c5p5N2:L6c6p6N3:L7c7p7N3:L8c8p8N4:L9c9p9N4:L10c10p10N5:L11c11p11N5
that get me 12 procs over 6 numa nodes, good!!
but playing a bit with a lot of processes showed me that erlang was not fully use all proccesors
So i relayed to use +sbt to see how binding changes cpu stats....
but erlang refuses to use any bindings:
otp_src_R13B04]$ erl +scyt ... +sbt u +A6
setting scheduler bind type 'u' failed: not supported
otp_src_R13B04]$ erl +scyt ... +sbt nnps +A6
setting scheduler bind type 'nnps' failed: not supported
My kernel is 2.4.21-sgi306rp12 Its too old for this!!! isn't it?
Most people know C is not so high level....
...Everybody else just got assembler overdose
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