Task to busy one CPU 100% for a period of time?

Ian Smith smithi at nimnet.asn.au
Mon Jan 11 05:04:11 UTC 2016

On Sun, 10 Jan 2016 10:39:40 -0553.75, William A. Mahaffey III wrote:

 > Date: Sun, 10 Jan 2016 10:39:40 -0553.75

That's a seriously strange timezone you're inhabiting, Wiliiam ..
fly.hiwaay.net processed this at Sun, 10 Jan 2016 10:34:11 -0600

 > On 01/10/16 10:03, Ian Smith wrote:

 > > So I'm looking for some utility, preferably in the base system but a
 > > port/pkg could do, that can just burn one CPU (ie is single-threaded)
 > > for a specified number of iterations.  And not for a specified time -
 > > which would use system time to query time - nor in any interpreted
 > > (syscall-rich) language.
 > > 
 > > A little pre- and/or post-loop reporting is not a problem.
 > > 
 > > I'm likely missing something quite obvious; suggestions welcome.
 > > 
 > > cheers, Ian  (please cc me, I'm subscribed to the daily digest)

 > Well, this (benchmarking) really strikes a chord w/ me, I have done
 > *extensive* benchmarking of compiled code (simple benchmarking code & full-up
 > analysis codes) under different compiler/OS combos over 25-ish years. FWIW
 > most compilers I am familiar with have an option to compile
 > single-core/thread/CPU code, which might serve your needs. Also most recent
 > (last 15-ish years) pay attention to environment variables such as
 > OMP_NUM_THREADS & kin, even if they don't use OpenMP coding/directives. This
 > can be used to make 1 process use a specified number of threads/cores/CPU's,
 > up to a compiled-in/hardwired limit.

Thanks for your response.  However I don't do C, and really need to find
something out of the box that I can configure to run at 100% of one CPU 
for a specified number of iterations, which will then run for a certain 
amount of CPU time on my hardware, while always on the run queue.


cheers, Ian

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