* cpufreq/ does not exist
@ 2004-09-09 14:46 Marco Aurelio Stelmar Netto
2004-09-09 16:13 ` Dominik Brodowski
0 siblings, 1 reply; 5+ messages in thread
From: Marco Aurelio Stelmar Netto @ 2004-09-09 14:46 UTC (permalink / raw)
To: cpufreq
Hello,
I have a machine (desktop machine) HP EP-C c10 with a Pentium III
(Coppermine) 1GHz and I'm making some performance tests so I would like
to have the machine processor working at 500 MHz. I have configured the
cpufreq option (kernel 2.6.6) but the cpufreq directory in
/sys/devices/system/cpu/cpu0 does not exist.
I have used the deprecated interface (/proc/cpufreq), but I think it didn't
work (I think it should show some values here):
cat /proc/cpufreq
minimum CPU frequency - maximum CPU frequency - policy
I don't know if I have made some mistake or my cpu does not support the
cpufreq. I have tried to modify the clock frequency via BIOS, but such an
option is not available. All I want is to modify the clock frequency. It
does not need be on-the-fly.
Can anyone give me some help?
Thanks,
Marco
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: cpufreq/ does not exist 2004-09-09 14:46 cpufreq/ does not exist Marco Aurelio Stelmar Netto @ 2004-09-09 16:13 ` Dominik Brodowski 2004-09-09 16:35 ` last alternative : program to consume CPU?! Marco Aurelio Stelmar Netto 0 siblings, 1 reply; 5+ messages in thread From: Dominik Brodowski @ 2004-09-09 16:13 UTC (permalink / raw) To: Marco Aurelio Stelmar Netto; +Cc: cpufreq On Thu, Sep 09, 2004 at 11:46:35AM -0300, Marco Aurelio Stelmar Netto wrote: > > Hello, > > I have a machine (desktop machine) HP EP-C c10 with a Pentium III > (Coppermine) 1GHz and I'm making some performance tests so I would like > to have the machine processor working at 500 MHz. I have configured the > cpufreq option (kernel 2.6.6) but the cpufreq directory in > /sys/devices/system/cpu/cpu0 does not exist. ... > I don't know if I have made some mistake or my cpu does not support the > cpufreq. I have tried to modify the clock frequency via BIOS, but such an > option is not available. All I want is to modify the clock frequency. It > does not need be on-the-fly. A desktop Coppermine Pentium III does not support SpeedStep, so no cpufreq support exists. Possibly you can change the CPU speed in your system BIOS. Dominik ^ permalink raw reply [flat|nested] 5+ messages in thread
* last alternative : program to consume CPU?! 2004-09-09 16:13 ` Dominik Brodowski @ 2004-09-09 16:35 ` Marco Aurelio Stelmar Netto 2004-09-10 0:11 ` GoatZilla 0 siblings, 1 reply; 5+ messages in thread From: Marco Aurelio Stelmar Netto @ 2004-09-09 16:35 UTC (permalink / raw) To: Dominik Brodowski; +Cc: cpufreq The BIOS of my machine does not support the modification of the CPU speed. My problem is that I have a homogeneous cluster composed of 16 machines and I need to perform some tests of my application on a heterogeneous cluster. So my first option was to change the cpu speed in the BIOS, but failed. The second option was to find some support in the linux itself. I have found the cpufreq, but failed. My last option is to implement or find a program to consume a percentage of CPU. Do you know where I can find a good program to perform this task? Or do you know another alternative to solve my problem? Thank you very much for your attention. Marco On Thu, 9 Sep 2004, Dominik Brodowski wrote: > On Thu, Sep 09, 2004 at 11:46:35AM -0300, Marco Aurelio Stelmar Netto wrote: > > > > Hello, > > > > I have a machine (desktop machine) HP EP-C c10 with a Pentium III > > (Coppermine) 1GHz and I'm making some performance tests so I would like > > to have the machine processor working at 500 MHz. I have configured the > > cpufreq option (kernel 2.6.6) but the cpufreq directory in > > /sys/devices/system/cpu/cpu0 does not exist. > ... > > I don't know if I have made some mistake or my cpu does not support the > > cpufreq. I have tried to modify the clock frequency via BIOS, but such an > > option is not available. All I want is to modify the clock frequency. It > > does not need be on-the-fly. > > A desktop Coppermine Pentium III does not support SpeedStep, so no cpufreq > support exists. Possibly you can change the CPU speed in your system BIOS. > > Dominik > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: last alternative : program to consume CPU?! 2004-09-09 16:35 ` last alternative : program to consume CPU?! Marco Aurelio Stelmar Netto @ 2004-09-10 0:11 ` GoatZilla 2004-09-10 0:27 ` Marco Aurelio Stelmar Netto 0 siblings, 1 reply; 5+ messages in thread From: GoatZilla @ 2004-09-10 0:11 UTC (permalink / raw) To: cpufreq Uhm... Treat the machine as a dual CPU resource, and load it down with 2 jobs instead of 1? On Thu, 9 Sep 2004 13:35:56 -0300 (BRT), Marco Aurelio Stelmar Netto <stelmar@cpad.pucrs.br> wrote: > > The BIOS of my machine does not support the modification of the CPU speed. > > My problem is that I have a homogeneous cluster composed of 16 machines > and I need to perform some tests of my application on a heterogeneous > cluster. So my first option was to change the cpu speed in the BIOS, but > failed. The second option was to find some support in the linux itself. > I have found the cpufreq, but failed. My last option is to implement or > find a program to consume a percentage of CPU. Do you know where I can > find a good program to perform this task? Or do you know another alternative > to solve my problem? > > Thank you very much for your attention. > > Marco > > On Thu, 9 Sep 2004, Dominik Brodowski wrote: > > > On Thu, Sep 09, 2004 at 11:46:35AM -0300, Marco Aurelio Stelmar Netto wrote: > > > > > > Hello, > > > > > > I have a machine (desktop machine) HP EP-C c10 with a Pentium III > > > (Coppermine) 1GHz and I'm making some performance tests so I would like > > > to have the machine processor working at 500 MHz. I have configured the > > > cpufreq option (kernel 2.6.6) but the cpufreq directory in > > > /sys/devices/system/cpu/cpu0 does not exist. > > ... > > > I don't know if I have made some mistake or my cpu does not support the > > > cpufreq. I have tried to modify the clock frequency via BIOS, but such an > > > option is not available. All I want is to modify the clock frequency. It > > > does not need be on-the-fly. > > > > A desktop Coppermine Pentium III does not support SpeedStep, so no cpufreq > > support exists. Possibly you can change the CPU speed in your system BIOS. > > > > Dominik > > > > _______________________________________________ > Cpufreq mailing list > Cpufreq@www.linux.org.uk > http://www.linux.org.uk/mailman/listinfo/cpufreq > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: last alternative : program to consume CPU?! 2004-09-10 0:11 ` GoatZilla @ 2004-09-10 0:27 ` Marco Aurelio Stelmar Netto 0 siblings, 0 replies; 5+ messages in thread From: Marco Aurelio Stelmar Netto @ 2004-09-10 0:27 UTC (permalink / raw) To: GoatZilla; +Cc: cpufreq Hi, I'm almost there. A friend of mine gave me a program to consume CPU. I'm just performing some tuning in it. Of course it is not an elegant solution, but I think it will resolve my problem. Note that suggestions are still very welcome ;) -------------------------------- #define RESOLUTION 1000000 struct itimerval value; unsigned long busy, idle; void sigHandler(int signum) { usleep(idle); setitimer(ITIMER_REAL, &value, NULL); } int main(int argc, char **argv) { struct sigaction sa; float perc; if(argc != 2) { printf("Usage: %s <value>\n", argv[0]); exit(0); } perc = atof(argv[1]); if((perc < 0) || (perc > 1)) { printf("Value must be between 0 and 1\n"); exit(0); } busy = perc*RESOLUTION; idle = (1-perc)*RESOLUTION; memset(&sa, 0, sizeof(sa)); sa.sa_handler = sigHandler; sigaction(SIGALRM, &sa, NULL); memset(&value, 0, sizeof(struct itimerval)); value.it_value.tv_usec = busy; setitimer(ITIMER_REAL, &value, NULL); for(;;); return 0; } ------------------------------- Thanks for your suggestion. On Thu, 9 Sep 2004, GoatZilla wrote: > Uhm... > > Treat the machine as a dual CPU resource, and load it down with 2 jobs > instead of 1? > > > > > On Thu, 9 Sep 2004 13:35:56 -0300 (BRT), Marco Aurelio Stelmar Netto > <stelmar@cpad.pucrs.br> wrote: > > > > The BIOS of my machine does not support the modification of the CPU speed. > > > > My problem is that I have a homogeneous cluster composed of 16 machines > > and I need to perform some tests of my application on a heterogeneous > > cluster. So my first option was to change the cpu speed in the BIOS, but > > failed. The second option was to find some support in the linux itself. > > I have found the cpufreq, but failed. My last option is to implement or > > find a program to consume a percentage of CPU. Do you know where I can > > find a good program to perform this task? Or do you know another alternative > > to solve my problem? > > > > Thank you very much for your attention. > > > > Marco > > > > On Thu, 9 Sep 2004, Dominik Brodowski wrote: > > > > > On Thu, Sep 09, 2004 at 11:46:35AM -0300, Marco Aurelio Stelmar Netto wrote: > > > > > > > > Hello, > > > > > > > > I have a machine (desktop machine) HP EP-C c10 with a Pentium III > > > > (Coppermine) 1GHz and I'm making some performance tests so I would like > > > > to have the machine processor working at 500 MHz. I have configured the > > > > cpufreq option (kernel 2.6.6) but the cpufreq directory in > > > > /sys/devices/system/cpu/cpu0 does not exist. > > > ... > > > > I don't know if I have made some mistake or my cpu does not support the > > > > cpufreq. I have tried to modify the clock frequency via BIOS, but such an > > > > option is not available. All I want is to modify the clock frequency. It > > > > does not need be on-the-fly. > > > > > > A desktop Coppermine Pentium III does not support SpeedStep, so no cpufreq > > > support exists. Possibly you can change the CPU speed in your system BIOS. > > > > > > Dominik > > > > > > > _______________________________________________ > > Cpufreq mailing list > > Cpufreq@www.linux.org.uk > > http://www.linux.org.uk/mailman/listinfo/cpufreq > > > > _______________________________________________ > Cpufreq mailing list > Cpufreq@www.linux.org.uk > http://www.linux.org.uk/mailman/listinfo/cpufreq > ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-09-10 0:27 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2004-09-09 14:46 cpufreq/ does not exist Marco Aurelio Stelmar Netto 2004-09-09 16:13 ` Dominik Brodowski 2004-09-09 16:35 ` last alternative : program to consume CPU?! Marco Aurelio Stelmar Netto 2004-09-10 0:11 ` GoatZilla 2004-09-10 0:27 ` Marco Aurelio Stelmar Netto
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