Thank you! I am sorry for asking, but how can I force the frequencies with sysfs? I found the following entries in /sys:
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq Only the last two are writable, but changing them does not effect the first three. I also do not really understand the differences. I hope you could help me out here. Thank you, Andrej But I am not allowed to write those from user space. Is t On Wed, Oct 15, 2008 at 4:56 PM, stephane eranian <[EMAIL PROTECTED]> wrote: > Andrej, > > > On Wed, Oct 15, 2008 at 7:32 AM, Andrej van der Zee > <[EMAIL PROTECTED]> wrote: >> Sorry, let me be more specific. Obviously I need the number of cycles >> per second to convert cycles to seconds. Is it possible to get this >> value programmatic? And supposedly I have the value, is there anything >> against using it in a simple formula like: CPU_SEC = MEASURED_CYCLES / >> CYCLES_PER_SEC. >> > You can get the cycles per second from the frequency of the CPU. This > is available > in /proc/cpuinfo and expressed in MHz. 1MHz is 1 million cycles per second. > > However, you have to be careful with CPU clock speed throttling, i.e., > varying clock > frequency based on utilization. To avoid problems, you need to lock the speed > by > forcing the min/max frequencies via sysfs. > -- Andrej van der Zee 2-40-19 Koenji-minami Suginami-ku, Tokyo 166-0003 JAPAN Mobile: 0031-(0)80-65251092 Phone/Fax: 0031-(0)3-3318-3155 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
