[fpc-devel] AMD & Intel CPUCount

[Mark Morgan Lloyd]

Marco van de Voort wrote:
> In our previous episode, Mark Morgan Lloyd said:
>>> cards and has been told to shut one down for maintenance. Solaris 
>>> definitely does this on SPARC, I don't know about its position on x86, 
>>> and I don't know about Linux's general position.
>> Also somebody needs to check the situation with VMWare, Qemu etc., since 
>> they might be uncomfortable virtualising CPUID.
>>
>> I've just checked and taskset is supported on zLinux, so I'm fairly 
>> confident that the API that underlies it is universal on Linux 2.6+: I 
>> really do think that that's what should be used for this job.
> 
> Note that in applications this should never be used for more than the
> default of a configurable option anyway.
> 
> The way new processors deal with this, can change at any time, and not
> making this configurable would seriously limit the durability of the
> software.

If the number of CPUs changed during the lifetime of an app, it would 
need to know the current situation rather than the original one.

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]