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.