> > In the last episode (Apr 02), Mark said: > > Dan Nelson wrote: > > >>> Someone can send some pointers on how to measure global CPU load > > >>> under FreeBSD from a C program ? I'm looking for values for > > >>> idle/kernel/user, in a similar way as does top. Is there any > > >>> pointer or doc ?. I'd like to avoir browsing top code. > > >> > > >> Use sysctlbyname(3) to retrieve vm.loadavg, which is a struct > > >> loadavg (defined in <sys/resource.h>) > > > > > > Actually the kern.cp_time variable might be better if you want > > > idle/kernel/user values. > > > > I current let snmpd do the job. Is that as accurate as manually > > reading the kern.cp_time variable? > > If you're talking about enterprises.ucdavis.systemStats, then yes. > Snmpd digs directly into /dev/kmem instead of using sysctl (so it can > run on older kernels that didn't provide the sysctl variable), but the > values are the same. enterprises.ucdavis.laTable is populated from the > vm.loadavg sysctl variable.
If I'm not wrong, loadavg gives the mean number of processes in the run queue averaged on 1, 5 and 15 minutes. This gives an idea of system load but lacks precision. It seems to me that kern.cp_time counters is a better metrics of CPU load. > > -- > Dan Nelson > [EMAIL PROTECTED] > _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
