Comment 3 for bug 497645

James Troup wrote:
> Michael Hudson <email address hidden> writes:
>
>> I talked about this with Aaron a little, and we decided that passing
>> the number of CPUs on the slave to the getJobForMachine XML-RPC call
>> would be less work. "os.sysconf('SC_NPROCESSORS_ONLN')" is a way to
>> find the number of CPUs.
>
> This will misrepresent the capacity of SMT boxes (as our current
> generation of servers are)

Bugger. I thought I checked this, but obviously got it wrong somehow.

> and for something like code import that's
> probably bad (it's not the kind of work load which will benefit from
> scaling with number of threads rather than cores).

Yeah/

> That said, I'm afraid I don't know a particular clean way to detect
> active SMT other than to check for duplicate core id's in /proc/cpuinfo.
> (And bear in mind that older CPUs won't have a core ID in /proc/cpuinfo)

That sounds fairly horrible. Maybe CodeImportMachine.cpu_count is
easier then.

Cheers,
mwh