> That's percentage of what, exactly? For example, if one CPU is in a > low power state (I know Solaris 10 doesn't do this now, but I'm thinking > ahead to the future), then does the X% CPU cap represent the fraction > relative to a all-CPUs-full-on 100%, or to the reduced-power-condition's > 100%?
CPU cap is a percentage of absolute time over some short absolute time period that a system can spend running threads from a specific application (as identified by project ID or zone ID). It is not based on the actual amount of executed instructions and/or a processor's power management settings. CPU cap of 10 means 10% of a single CPU, no matter how many CPUs are available. CPU cap of 200 means that application can use up to 2 whole CPUs. Note that this is done without binding threads to CPUs, so threads can still migrate but they will be artificially slowed down by the scheduler if their usage goes above the cap. - Andrei _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
