Re: cyclic test results on 8 way (2.6.23.1-rt7 through 2.6.23.1-rt11)

[Darren Hart <dvhltc@us.ibm.com>]

On Tuesday 13 November 2007 05:30:52 Jaswinder Singh wrote:
> Hello Greg and Darren,
>
> If possible, can you please also add processor ID/number in your
> cyclictest and run more tasks (say 40, 60 or 80 tasks) then we have
> good picture like how many processes are running in which processor
> and how they switching between processors.

Sorry I'm not quite sure what you are requesting.  

What do you mean by "add processor ID/number in your cyclictest"?  

Are you suggesting running 40-80 copies of cyclictest in parallel?

>
> And can we force processes to run on specific processor or core.

We certainly can... it seems to me that pinning the tasks to CPUs just 
reducing scheduling interference and makes the test easier... what are you 
trying to accomplish by doing this?

--Darren

>
> Thank you,
>
> Jaswinder Singh.
>
> On Nov 8, 2007 7:26 PM, Gregory Haskins <ghaskins@novell.com> wrote:
> > >>> On Thu, Nov 8, 2007 at  2:34 AM, in message
> >
> > <200711072334.40216.dvhltc@us.ibm.com>, Darren Hart <dvhltc@us.ibm.com> 
wrote:
> > > Greg,
> > >
> > > Here are the results I promised you.
> >
> > Darren,
> >   First off, thanks a bunch for running through those tests!
> >
> > > I don't think they are particularly interesting
> >
> > They *are* interesting in the sense that peaks of 40ish for an 8-way are
> > excellent IMO ;)  But yeah, i see what you mean; theres no interesting
> > difference between them.
> >
> > Do you have any comparative data from runs in -rt1 or earlier kernels?
> >
> > > perhaps more iterations, say 1000000?
> >
> > We generally load the system up a lot more (e.g. "make -j 128")  or let
> > it run for a long time with the make in a loop (or both).  For instance,
> > here is the last data I gathered (with plot attached).  This was for a
> > single pass of "make mrproper; make allmodconfig; time make -j 128"
> >
> > 23.1-rt7
> > -----------------
> > real    10m49.312s
> > user    49m59.674s
> > sys     16m15.404s
> >
> > 26.38 76.02 56.11 1/304 21301
> >
> > T: 0 ( 5959) P:90 I:100 C:7500381 Min:      2 Act:    2 Avg:    4 Max:   
> >   78 T: 1 ( 5960) P:89 I:200 C:3750191 Min:      2 Act:    3 Avg:    5
> > Max:      91 T: 2 ( 5961) P:88 I:300 C:2500127 Min:      2 Act:    3 Avg:
> >    4 Max:      66 T: 3 ( 5962) P:87 I:400 C:1875096 Min:      2 Act:    5
> > Avg:    6 Max:     106 T: 4 ( 5963) P:86 I:500 C:1500077 Min:      2 Act:
> >    6 Avg:    5 Max:      92 T: 5 ( 5964) P:85 I:600 C:1250064 Min:      2
> > Act:    5 Avg:    6 Max:      93 T: 6 ( 5965) P:84 I:700 C:1071483 Min:  
> >    2 Act:    3 Avg:    6 Max:      78 T: 7 ( 5966) P:83 I:800 C: 937548
> > Min:      2 Act:    5 Avg:    6 Max:      97
> >
> > 23.1-rt10
> > -----------------
> >
> > real    10m39.046s
> > user    56m31.662s
> > sys     12m51.158s
> >
> > 7.64 63.88 62.70 1/291 30774
> >
> > T: 0 (15455) P:90 I:100 C:8001856 Min:      2 Act:    3 Avg:    4 Max:   
> >   65 T: 1 (15456) P:89 I:200 C:4000928 Min:      2 Act:    3 Avg:    4
> > Max:      46 T: 2 (15457) P:88 I:300 C:2667286 Min:      2 Act:    3 Avg:
> >    5 Max:      54 T: 3 (15458) P:87 I:400 C:2000464 Min:      2 Act:    3
> > Avg:    5 Max:      46 T: 4 (15459) P:86 I:500 C:1600372 Min:      2 Act:
> >    3 Avg:    5 Max:      46 T: 5 (15460) P:85 I:600 C:1333643 Min:      2
> > Act:    5 Avg:    5 Max:      75 T: 6 (15461) P:84 I:700 C:1143123 Min:  
> >    2 Act:    5 Avg:    6 Max:      52 T: 7 (15462) P:83 I:800 C:1000232
> > Min:      2 Act:    4 Avg:    5 Max:      66
> >
> > 23.1-rt11
> > -----------------
> >
> > real    10m41.610s
> > user    55m37.065s
> > sys     13m16.394s
> >
> > 101.92 101.56 61.65 1/308 21349
> >
> > T: 0 ( 6028) P:90 I:100 C:6584414 Min:      2 Act:    3 Avg:    4 Max:   
> >   55 T: 1 ( 6029) P:89 I:200 C:3292207 Min:      2 Act:    6 Avg:    5
> > Max:      58 T: 2 ( 6030) P:88 I:300 C:2194805 Min:      2 Act:    5 Avg:
> >    5 Max:      54 T: 3 ( 6031) P:87 I:400 C:1646104 Min:      2 Act:    5
> > Avg:    5 Max:      79 T: 4 ( 6032) P:86 I:500 C:1316883 Min:      2 Act:
> >    5 Avg:    5 Max:      60 T: 5 ( 6033) P:85 I:600 C:1097403 Min:      2
> > Act:    5 Avg:    6 Max:      45 T: 6 ( 6034) P:84 I:700 C: 940631 Min:  
> >    2 Act:    3 Avg:    6 Max:      45 T: 7 ( 6035) P:83 I:800 C: 823052
> > Min:      2 Act:    5 Avg:    6 Max:      47
> >
> > As Steven Rostedt pointed out on IRC, numbers coming from me are suspect
> > ;).  But we can at least use them to see if you can repro similar
> > results.
> >
> > Thanks again!
> >
> > Regards,
> > -Greg



-- 
Darren Hart
IBM Linux Technology Center
Realtime Linux Team