https://community.intel.com/t5/Intel-MPI-Library/MPI-size-0-while-everithing-else-seems-to-work/m-p/1744810#M12272 <P>Hi,</P><P>I have installed the latest OneAPI of April 7, 2026, and run ifx together with MPI with Visual Studio 2022. For some reason MPI size=0 despite ierr=0 after MPI_INIT. Compilation, linking (mpiifx) and run (mpiexec) appear to work as expected.&nbsp;</P><P>Best regards</P><P>Sanders</P> Fri, 17 Apr 2026 19:37:37 GMT Sanders1 2026-04-17T19:37:37Z https://community.intel.com/t5/Intel-MPI-Library/MPI-size-0-while-everithing-else-seems-to-work/m-p/1744810#M12272 <P>Hi,</P><P>I have installed the latest OneAPI of April 7, 2026, and run ifx together with MPI with Visual Studio 2022. For some reason MPI size=0 despite ierr=0 after MPI_INIT. Compilation, linking (mpiifx) and run (mpiexec) appear to work as expected.&nbsp;</P><P>Best regards</P><P>Sanders</P> Fri, 17 Apr 2026 19:37:37 GMT https://community.intel.com/t5/Intel-MPI-Library/MPI-size-0-while-everithing-else-seems-to-work/m-p/1744810#M12272 Sanders1 2026-04-17T19:37:37Z