On 01/06/2013 01:57, "Flanagan, Elizabeth" <[email protected]> wrote:
>On Fri, May 31, 2013 at 7:41 AM, Barros Pena, Belen ><[email protected]> wrote: >> On 31/05/2013 15:20, "Paul Eggleton" <[email protected]> >>wrote: >> >>>On Friday 31 May 2013 14:05:08 Barros Pena, Belen wrote: >>>> We have answered pretty much all questions about task-related >>>>information, >>>> except one about task Disk I/O. Just wondering if anybody could help >>>>us >>>> with it. >>>> >>>> Looking at the buildstats directory, it looks like we collect a whole >>>> bunch of task information that seems disk I/O related: >>>> >>>> EndIOinProgress >>>> EndReadsComp >>>> EndReadsMerged >>>> EndSectRead >>>> EndSectWrite >>>> EndTimeIO >>>> EndTimeReads >>>> EndTimeWrite >>>> EndWTimeIO >>>> EndWritesComp >>>> StartIOinProgress >>>> StartReadsComp >>>> StartReadsMerged >>>> StartSectRead >>>> StartSectWrite >>>> StartTimeIO >>>> StartTimeReads >>>> StartTimeWrite >>>> StartWTimeIO >>>> StartWritesComp >>>> >>>> I have no idea what the above really means, but I wonder if we could >>>>use >>>> it to calculate a single (yet meaningful) measure of Disk I/O for a >>>>given >>>> task. What such measure would be and how to calculate it is what I >>>>need >>>> help with. >>>> > >So, all of this comes from iostats in the kernel. For full documentation >see: > >https://www.kernel.org/doc/Documentation/iostats.txt > >I think what you're probably looking for is the difference between >EndTimeIO and StartTimeIO... Thanks, Beth! I think we'll take your advice and report the number of ms spent doing I/Os If someone does not agree, please let me know. Belen > >-b > >>>> Any thoughts? >>> >>>FYI some hints on some of these from one of Beth's original commits: >>> >>>http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=b525fc13063a6d >>>68 >>>1a14c871580efaab458dd370 >> >> This really helps. Thanks Paul! >> >> Could Weighted time doing I/O (WTimeIO) be the measure we are looking >>for? >> > > > >>> >>>Cheers, >>>Paul >>> >>>-- >>> >>>Paul Eggleton >>>Intel Open Source Technology Centre >> >> --------------------------------------------------------------------- >> Intel Corporation (UK) Limited >> Registered No. 1134945 (England) >> Registered Office: Pipers Way, Swindon SN3 1RJ >> VAT No: 860 2173 47 >> >> This e-mail and any attachments may contain confidential material for >> the sole use of the intended recipient(s). Any review or distribution >> by others is strictly prohibited. If you are not the intended >> recipient, please contact the sender and delete all copies. > > > >-- >Elizabeth Flanagan >Yocto Project >Build and Release --------------------------------------------------------------------- Intel Corporation (UK) Limited Registered No. 1134945 (England) Registered Office: Pipers Way, Swindon SN3 1RJ VAT No: 860 2173 47 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. _______________________________________________ webhob mailing list [email protected] https://lists.yoctoproject.org/listinfo/webhob
