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| | The ch_p4 device |
 | | P4 (Portable Programs for Parallel Processors) is an older message passing library that was used to implement the MPICH ADI[9]. |
 | | P4 runs on Sun/SunOS, Sun/Solaris, Solaris86, Cray, HP, Dec 5000, Dec Alpha, Next, IBM RS6000, Linux86, FreeBSD, IBM3090, SGI (5, 6), and others. |
 | | P4 processes start a ``listener'' subprocess that helps to establish process-to-process connections if there aren't enough TCP connections to fully connect the MPI application. |
| www.netlib.org /utk/mpi-review/node15.html (425 words) |
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