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Tracing MPI File IO
On Linux* OS, Intel® Trace Collector does not support tracing of ROMIO*, a portable implementation of MPI-IO. Fully standard-compliant implementations of MPI-IO are untested, but might work.
This distinction is necessary because ROMIO normally uses its own request handles (MPIO_Request) for functions like MPI_File_iread() and expects the application to call MPIO_Wait()/MPIO_Test(). These two functions are supported if and only if Intel® Trace Collector is compiled with ROMIO support. In that case the wrapper functions for MPI_File_iread() are compiled for MPIO_Requests and might not work if the MPI and the application use the normal MPI-2 MPI_Request.
Applications which avoid the non-blocking IO calls should work either way.
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