Hi, Stephane On Thu, 31 Jan 2013 14:54:37 +0100, Stephane Eranian wrote: > This patchset adds a new command to perf: perf uncore. > It is used to measure processor socket-level metrics > on a system-wide basis and at all priv levels. > > The command comes with a set of predefined key metrics > which are useful to measure multi-socket system imbalance > and various bandwidths. > > The following metrics are currently defined: > - memory bandwidth (Nehalem, Westmere, SandyBridge-EP) > - PCIe bandwidth (SandyBridge-EP) > - QPI bandwidth (SandyBridge-EP) > - C-state residency (SandyBridge-EP) > > Others can be added in the future. > > The command provides options to modify the unit of the metrics > (default: MB/s for bandwidth). > > Example on Nehalem: > > # perf uncore > #------------------------------ > # Socket0 | > #------------------------------ > # RAM Bandwidth | > # Wr Rd| > # MB/s MB/s| > #------------------------------ > 4954.99 14897.29 > 4953.97 14894.56 > 4947.52 14874.97 > > To make plotting easier, the output can be augmented with a timestamp: > > # perf uncore -T > #---------------------------------------- > # | Socket0 | > # |------------------------------ > # Time | RAM Bandwidth | > # in | Wr Rd| > # secs | MB/s MB/s| > #---------------------------------------- > 1 4952.50 14890.49 > 2 4955.55 14900.19 > 3 4949.13 14879.60 > 4 4954.66 14896.26 > > The code is split between generic layer (builtin-uncore.c) and > an arch specific layer (arch/*/util/uncore.c). All events are > hardcoded because they don't change for a given processor and > metric computation requires combining multiple events.
>From a quick glancing, I think this is basically what perf stat does with selected events, right? As we now have your interval printing I can't find much difference. And there's a patchset [1] from Jiri to support some kind of formula - yeah, now I've written the correct spelling. :) - that might fit to this purpose if you provide suitable formula file IMHO. So I guess we don't need to have another command and can reuse perf stat, no? Thanks, Namhyung [1] http://lwn.net/Articles/532634/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
