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_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_Requestsand might not work if the MPI and the application use the normal MPI-2
Applications which avoid the non-blocking IO calls should work either way.