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On Fri, 15 Jun 2007, Balbir Singh wrote: > malc wrote:>> On Thu, 14 Jun 2007, Ingo Molnar wrote:>> [..snip..] >>>> Now integral load matches the one obtained via the "accurate" method. >> However the report for individual cores are of by around 20% percent. >>>> I think I missed some of the context, is the accounting of individual tasks > or cpustat values off by 20%? I'll try and reproduce this problem. Neither actually, the individual core idle times reported via `/proc/stat' are off by 20 percent, one over estimates and the other under estimates and the sum is right on the mark. >> Could you provide more details on the APC tool that you are using -- I > do not understand the orange and yellow lines, do they represent system > and user time? It's somewhat documented on the page: http://www.boblycat.org/~malc/apc Anyway the left bar is based on information from `/proc/stat' the right one is derived from the kernel module that just times how much time was spent in idle handler. The graphs: red - `/proc/stat', yellow - module. > NOTE: There is some inconsistency in the values reported by /usr/bin/time > (getrusage) and values reported in /proc or through delay accounting. I don't really use `getrusage'. -- vale - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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