Using logging and visualization

Logging and visualization support for MPI programs is provided with the MPE (MPI Programming Environment) software. The logging library provided with MPE tracks all MPI calls and saves the information to a log file that can be visualized.

• Link with the libraries -llmpe -lmpe to enable logging and the MPE environment. Then run the program as usual and a log file will be produced.
• The log file can be visualized using the jumpshot program that comes bundled with MPE.

When a program is linked with the MPE libraries, you will see a bit of extra output at the end that shows the logfile being written out.

[amit@localhost token-ring]: mpiexec -n 4 token_ring_mpi 
Pass a token through the   4 id ring:
     0 ->      1 ->      2 ->      3 ->      0
received token ring on 1 from 0
received token ring on 2 from 1
received token ring on 3 from 2
token ring done
...
Writing logfile....
Enabling the Default clock synchronization...
Finished writing logfile token_ring_mpi.clog2.
[amit@localhost token-ring]

After the program finishes, then there will be a log file created with the exntensiom clog2. Start the jumpshot program on this file as follows:
jumpshot token_ring_clog2
and follow directions from the program. Figure 1 shows a sample visualization.

Figure 1: MPI Visualization using Jumpshot