Effective Bandwidth (beff) Benchmark - Output


Output of the beff Benchmark

If not stated other, always the bandwidth per process is printed.

The output has the following sections:

HEAD
Short information about the memory per processor, the used cartesian dimensions, and the used values for L (message length).

LOOP
The time spent on the measurements is printed.

LOOPLNGS
The automatically adapted values of looplength are printed.

VALUES
The benchmark measurements are done in this sections. Following output is printed:

For each value of L, each method and each pattern:

min:
b(L) / (total number of messages of a pattern) * (maximum of messages in one process)
i.e. the minimal bandwidth of one process (except bundary nodes in acyclic cartesian topologies).
The value is printed for each repetition.
->
The maximum of all repetitions and in parentheses the amount of time spent on the measurement of these values.
avg:
Same as min, but the average of the time spent on the several processes is computed
max:
Same as min, but the maximum of the time spent on the several processes is computed

ELAPSED
The time spent on the measurements and the same time computed via the values of b(L), i.e. computed with the maximum of time spent for each measurement on all nodes. If the difference is more than 5% of the whole time then this is a hint, that the benchmark was not executed on a dedicated system or the MPI implementation has a bug.

PATTERN
Description of the patterns.

BY-METHODS
Separate analysis for each pattern and each communication method.

BY-REPETITIONS
Separate analysis for each pattern and each repetition.

BY-MTHD-MSGLNG
Separate analysis for each pattern, each communication method and each message length.

BY-MSGLNG
Separate analysis for each message length. The columns are

BY-PATTERN-MSGLNG
Separate analysis for each pattern and some message lengths. The last column is the base for computing the logarithmic average of the cartesian and random patterns. The last line shows the effective bandwidth per process.

BEFF
The effective bandwidth beff and the system parameters are printed.

Final result line
Summary of the result on one line.


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Rolf Rabenseifner