IIRC, the lgroup probing code is different for every SPARC platform, and
lives in a platform-specific source file, which is probably not open. But
it's not done in lgrp_plat_probe(); the OBP sends up information about the
NUMA topology.
Mike Marty wrote:
Hello,
I've noticed that the OpenSolaris seems to support NUMA memory allocation
(memory placement optimization) for Opteron machines. Specifically the lgroups
are created in this platform-specific file:
/usr/src/uts/i86pc/os/lgrpplat.c
However the corresponding Sparc platform file appears *not* to probe memory
latencies and assumes UMA memory allocation:
/usr/src/uts/sun4/os/lgrpplat.c
In the above file, the lgrp_plat_probe() function is stubbed out whereas the
i86pc file appears to have full functionality.
I know that the Sun Enterprise 25000 machine is NUMA.
I would like NUMA in-order to simulate future NUMA chip-multiprocessors using
Virtutech Simics and the Wisconsin GEMS toolkit.
Why does OpenSolaris lack the Lgroup memory-probing functionality for the Sparc
platform?
Thanks,
Mike Marty
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