Date: Mon, 11 Jan 2016 16:04:05 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: "William A. Mahaffey III" <wam@hiwaay.net> Cc: freebsd-questions@freebsd.org Subject: Re: Task to busy one CPU 100% for a period of time? Message-ID: <20160111154616.G93547@sola.nimnet.asn.au> In-Reply-To: <56928802.2040802@hiwaay.net> References: <20160111002439.Q93547@sola.nimnet.asn.au> <56928802.2040802@hiwaay.net>
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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. Anyone? cheers, Ian
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