I am trying what you said, but can you clarify this: Although the -F option is 20M instruction in both versions, I noticed that the old version enters real simulation at tick 22,407,755,000 but the new version enters at tick 90,443,309,000
I made the config files as closely as possible (same system bus freq, O3 parameters, ...) Why they switch at different tick numbers? -- // Naderan *Mahmood; On Sun, Apr 15, 2012 at 9:35 AM, Korey Sewell <[email protected]> wrote: > - make every O3CPU parameter that is different in the new version, the > same as the old version > > - check the stats file for major differences. > For example: Are the L1/L2 miss rates higher or lower? Are your caches the > same size and associativity? This is h.264, so is there a lot of floating > point insts being committed? If so, maybe the change is in the latencies of > the FP-Unit in the Function Unit Pool. > > - run gem5 for a small # of instructions (e.g. maxinsts=10) and see if > there is a difference in the number of ticks it takes to complete (this is > *after* all the O3 parameters are the same). If there is a difference, then > turn on some O3 flags or check the stats and see what's going on there. If > there is no difference increase the maxinsts and try again until you see > the simulations diverging. > > > > On Sun, Apr 15, 2012 at 12:46 AM, Mahmood Naderan <[email protected]>wrote: > >> I did that. >> There are some differences and I attached them. In short, I see this: >> >> old: >> children=dcache dtb icache itb tracer workload >> >> new: >> children=dcache dtb icache interrupts itb tracer workload >> >> Also the commitwidth, fetchwidth and some other parameters are 8 in the >> new version, but they are 4 in the old version. So I really wonder why it >> has a very low IPC. >> >> I will be greatly thankful if someone else try that. >> Also, I emailed another problem at >> http://permalink.gmane.org/gmane.comp.emulators.m5.devel/14987 about >> "Unable to find destination for addr" which I encountered in the new >> version. >> >> Appreciate any idea. >> >> >> >> >I believe the 'dotencode' message just means you should upgrade to a >> newer version of mercurial. >> ok I will try that. >> -- >> // Naderan *Mahmood; >> >> >> >> On Sun, Apr 15, 2012 at 3:45 AM, Steve Reinhardt <[email protected]>wrote: >> >>> I believe the 'dotencode' message just means you should upgrade to a >>> newer version of mercurial. >>> >>> >>> On Sat, Apr 14, 2012 at 10:36 AM, Mahmood Naderan >>> <[email protected]>wrote: >>> >>>> I forgot to say that I removed the 'dotencode' feature and the "hg >>>> heads" says: >>>> >>>> mahmood@tiger:gem5$ hg heads >>>> changeset: 8920:99083b5b7ed4 >>>> abort: data/.hgtags.i@b151ff1fd9df: no match found! >>>> >>>> >>>> On 4/14/12, Mahmood Naderan <[email protected]> wrote: >>>> > For the old one, I use: >>>> > build/X86_SE/m5.fast configs/example/cmp.py -F 20000000 --maxtick >>>> > 10000000000 -d --caches --l2cache -b h264_sss --prog-interval=1000000 >>>> > >>>> > for the new one I use: >>>> > build/X86/m5.fast configs/example/cmp.py --cpu-type=detailed -F >>>> > 20000000 --maxtick 10000000000 --caches --l2cache -b h264_sss >>>> > --prog-interval=1000000 >>>> > >>>> > I attached the configs and stats. Thanks >>>> > >>>> > On 4/14/12, Nilay Vaish <[email protected]> wrote: >>>> >> So, with 8613:712d8bf07020 you got and IPC of 1.54, and with some >>>> version >>>> >> near 8944:d062cc7a8bdf, you get an ipc of 0.093. Which CPU type are >>>> you >>>> >> using? >>>> >> >>>> >> -- >>>> >> Nilay >>>> >> >>>> >> On Sat, 14 Apr 2012, Mahmood Naderan wrote: >>>> >> >>>> >>> The previous release is: >>>> >>> changeset: 8613:712d8bf07020 >>>> >>> tag: tip >>>> >>> user: Nilay Vaish<[email protected]> >>>> >>> date: Sat Nov 05 15:32:23 2011 -0500 >>>> >>> summary: Tests: Update stats due to addition of fence microop >>>> >>> >>>> >>> >>>> >>> And the IPC is 1.541534 >>>> >>> >>>> >>> However for the new release, I am not able to find the head: >>>> >>> mahmood@tiger:gem5$ hg head >>>> >>> abort: requirement 'dotencode' not supported! >>>> >>> >>>> >>> >>>> >>> On 4/14/12, Nilay Vaish <[email protected]> wrote: >>>> >>>> How much is the difference and which versions of gem5 are you >>>> talking >>>> >>>> about? >>>> >>>> >>>> >>>> -- >>>> >>>> Nilay >>>> >>>> >>>> >>>> On Sat, 14 Apr 2012, Mahmood Naderan wrote: >>>> >>>> >>>> >>>>> Hi, >>>> >>>>> In the new version, I see that the IPC of h264 (with sss input) is >>>> >>>>> very very low. However with the previous releases, this value is >>>> fine >>>> >>>>> and acceptable. >>>> >>>>> >>>> >>>>> Do you know how can I find the bottleneck? Which stat value shows >>>> the >>>> >>>>> weired behaviour? >>>> >>>>> >>>> >>>>> ISA = x86 >>>> >>>>> -F = 50,000,000 >>>> >>>>> --maxtick = 10,000,000,000 >>>> >>>>> L1 = 32kB, 4 >>>> >>>>> L2 = 2MB, 16 >>>> >>>>> >>>> >>>>> the IPC obtained is 0.093432 >>>> >>>>> >>>> >>>>> Have you faced such result? Please let me know >>>> >>>>> >>>> >>>>> >>>> >>>>> -- >>>> >>>>> // Naderan *Mahmood; >>>> >>>>> _______________________________________________ >>>> >>>>> gem5-users mailing list >>>> >>>>> [email protected] >>>> >>>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>>>> >>>> >>>> _______________________________________________ >>>> >>>> gem5-users mailing list >>>> >>>> [email protected] >>>> >>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>>> >>>> >>> >>>> >>> >>>> >>> -- >>>> >>> -- >>>> >>> // Naderan *Mahmood; >>>> >>> _______________________________________________ >>>> >>> gem5-users mailing list >>>> >>> [email protected] >>>> >>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>> >>>> >> _______________________________________________ >>>> >> gem5-users mailing list >>>> >> [email protected] >>>> >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >> >>>> > >>>> > >>>> > -- >>>> > -- >>>> > // Naderan *Mahmood; >>>> > >>>> >>>> >>>> -- >>>> -- >>>> // Naderan *Mahmood; >>>> _______________________________________________ >>>> gem5-users mailing list >>>> [email protected] >>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>> >>> >>> _______________________________________________ >>> gem5-users mailing list >>> [email protected] >>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>> >> >> >> _______________________________________________ >> gem5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> > > > > -- > - Korey > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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