Changes between Version 6 and Version 7 of WikiStart


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Timestamp:
04/13/16 15:43:24 (9 years ago)
Author:
hfinkel
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  • WikiStart

    v6 v7  
    3030 
    3131On Titan, for example, there are 1008 OSTs, and a default stripe count of 4, so we use approximately 256 files. 
     32 
     33== Benchmarks == 
     34 
     35Once you build the library and associated programs (using make), you can run, for example: 
     36 
     37{{{ 
     38  $ mpirun -np 8 ./mpi/GenericIOBenchmarkWrite /tmp/out.gio 123456 2 
     39  Wrote 9 variables to /tmp/out (4691036 bytes) in 0.2361s: 18.9484 MB/s 
     40}}} 
     41 
     42{{{ 
     43  $ mpirun -np 8 ./mpi/GenericIOBenchmarkRead /tmp/out.gio 
     44  Read 9 variables from /tmp/out (4688028 bytes) in 0.223067s: 20.0426 MB/s [excluding header read] 
     45}}} 
     46 
     47The read benchmark always reads all of the input data. The output benchmark takes two numerical parameters, one if the number of data rows to write, and the second is a random seed (which slightly perturbs the per-rank output sizes, but not by much). Each row is 36 bytes for these benchmarks.