[Darshan-users] Darshan & EPCC benchio different behaviour

[Piero LANUCARA]

p.s

to be more "verbose" I add to the discussion:

Darshan output for the "serial" run (serial.pdf)

Darshan output for the MPI-IO run (mpiio.pdf)

benchio output for "serial" run (serial.out)

benchio output for "MPI-IO" run (mpi-io.out)

thanks

Piero

Il 04/02/2020 19:44, Piero LANUCARA ha scritto:
> Dear all
>
> I'm using Darshan to measure EPCC benchio benchmark 
> (https://github.com/EPCCed/benchio) behaviour on a given x86 Tier1 
> machine.
>
> running two benchio tests (MPI-IO and serial) a different behaviour 
> appear
>
> while Darhsan pdf log file is able to recover the estimated time and 
> bandwidth in the MPI-IO case, the "serial" run is completely 
> underestimated by Darshan (the time and bandwidth are less/greater 
> than benchio output).
>
> Suggestions are welcomed
>
> thanks
>
> Piero
>
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> Darshan-users mailing list
> Darshan-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/darshan-users
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-------------- next part --------------
 
 
 Simple Parallel IO benchmark
 ----------------------------
 
 Running on           36  process(es)
 Process grid is (           3 ,            3 ,            4 )
 Array size is   (         256 ,          256 ,          256 )
 Global size is  (         768 ,          768 ,         1024 )
 
 Total amount of data =    4608.00000000000       MiB
 
 Clock resolution is    1.00000000000000      , usecs
 
 ------
 Serial                                                          
 ------
 
 Writing to benchio_files/serial.dat                                        
 time =    4.84900808334351      , rate =    950.297446570284       MiB/s
 time =    4.83415985107422      , rate =    953.216306857548       MiB/s
 time =    4.82698416709900      , rate =    954.633336361116       MiB/s
 time =    4.82474207878113      , rate =    955.076960541716       MiB/s
 time =    4.82010507583618      , rate =    955.995756835366       MiB/s
 time =    4.82056093215942      , rate =    955.905353100847       MiB/s
 time =    4.81360197067261      , rate =    957.287292982415       MiB/s
 time =    4.81427383422852      , rate =    957.153697248804       MiB/s
 time =    4.81633496284485      , rate =    956.744087682433       MiB/s
 time =    4.82088708877563      , rate =    955.840681423281       MiB/s
 mintime =    4.81360197067261      , maxrate =    957.287292982415       MiB/s
 avgtime =    4.82406580448151      , avgrate =    955.215091960381       MiB/s
 Deleting: benchio_files/serial.dat                                        
 
 
 --------
 Finished
 --------
 

real	0m51.136s
user	0m0.028s
sys	0m0.019s
-------------- next part --------------
 
 
 Simple Parallel IO benchmark
 ----------------------------
 
 Running on           36  process(es)
 Process grid is (           3 ,            3 ,            4 )
 Array size is   (         256 ,          256 ,          256 )
 Global size is  (         768 ,          768 ,         1024 )
 
 Total amount of data =    4608.00000000000       MiB
 
 Clock resolution is    1.00000000000000      , usecs
 
 ------
 MPI-IO                                                          
 ------
 
 Writing to benchio_files/mpiio.dat                                         
 time =    3.85350108146667      , rate =    1195.79569398905       MiB/s
 time =    3.90402007102966      , rate =    1180.32180064706       MiB/s
 time =    3.88898396492004      , rate =    1184.88531749314       MiB/s
 time =    3.89588212966919      , rate =    1182.78732431550       MiB/s
 time =    3.88649392127991      , rate =    1185.64446345062       MiB/s
 time =    3.90831685066223      , rate =    1179.02416208123       MiB/s
 time =    3.90417695045471      , rate =    1180.27437241627       MiB/s
 time =    3.89346003532410      , rate =    1183.52312806427       MiB/s
 time =    3.89405012130737      , rate =    1183.34378255330       MiB/s
 time =    3.89044594764709      , rate =    1184.44005186266       MiB/s
 mintime =    3.85350108146667      , maxrate =    1195.79569398905       MiB/s
 avgtime =    3.89193310737610      , avgrate =    1184.00400968731       MiB/s
 Deleting: benchio_files/mpiio.dat                                         
 
 
 --------
 Finished
 --------
 

real	0m41.803s
user	0m0.033s
sys	0m0.021s