[Ganglia-general] How to annotate when we are using an HyperThreading processor

[Erwan V. <er...@ma...>]

I've just realised that ganglia is not able to count the number of
processors of a system.

I've been discussing of that with some other project, it could be good
to count or show the number of virtual processors.

when ganglia shows 2 processors on a host, is it 2 physical processors
or 1 phys with 1 virtual (ht).

We can use the physical_id (/proc/cpuinfo) to manage this. I suggest
something like for 1 CPU HT.

Name		Value 
cpu_phys_num	1
cpu_virtual_num	1

for 2 CPU non HT.
Name		Value 
cpu_phys_num	2
cpu_virtual_num	0

For a dual proc HT
Name		Value 
cpu_phys_num	2
cpu_virtual_num	2


WDYT about it ?
-- 
Erwan Velu
Linux Cluster Distribution Project Manager
Mandrakesoft
43 rue d'aboukir 75002 Paris
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