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Hi Bill,
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<div class="">To clarify, a singleton refers to a process started directly — such as ./real.exe, right? For the case of `mpirun ./real.exe`, or even `mpirun -np 1 ./real.exe`, is not technically a singleton, correct?</div>
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Hui Zhou</div>
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<div class="">On Nov 13, 2018, at 9:30 PM, William Gropp via discuss <<a href="mailto:discuss@mpich.org" class="">discuss@mpich.org</a>> wrote:</div>
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This is not quite true. From the MPI standard:
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<p class=""><span style="font-size: 12pt; font-family: CMSS12;" class="">10.5.2 Singleton MPI</span><span style="font-size: 12pt; font-family: CMTT12;" class="">_</span><span style="font-size: 12pt; font-family: CMSS12;" class="">INIT</span></p>
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<p class=""><span style="font-family: CMR10; font-size: 11pt;" class="">A high-quality implementation will allow any process (including those not started with a</span><span style="font-size: 6pt; font-family: CMR6; vertical-align: -1pt;" class=""> </span><span style="font-size: 11pt; font-family: CMR10;" class="">“parallel
application” mechanism) to become an </span><span style="font-size: 11pt; font-family: CMSS10;" class="">MPI
</span><span style="font-size: 11pt; font-family: CMR10;" class="">process by calling
</span><span style="font-size: 11pt; font-family: CMSS10;" class="">MPI</span><span style="font-size: 11pt; font-family: CMTT10;" class="">_</span><span style="font-size: 11pt; font-family: CMSS10;" class="">INIT</span><span style="font-size: 11pt; font-family: CMR10;" class="">.
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<div class="">There was a time when MPICH could do this, and there were features in the original PMI to support this.</div>
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<div class="">Bill</div>
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William Gropp<br class="">
Director and Chief Scientist, NCSA<br class="">
Thomas M. Siebel Chair in Computer Science<br class="">
University of Illinois Urbana-Champaign</div>
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<div class="">On Nov 13, 2018, at 10:27 AM, Si, Min via discuss <<a href="mailto:discuss@mpich.org" class="">discuss@mpich.org</a>> wrote:</div>
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<div text="#000000" bgcolor="#FFFFFF" class="">Hi Zhifeng,<br class="">
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You have to always execute the MPI program by using mpirun or mpiexec with -np <number of processes>.<br class="">
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At MPI_Init, the process tries to read information (e.g., MPI rank, number of processes) from the PMI server which is another process launched by the mpiexec command. This information is necessary for MPI library to initialize communication (e.g., connecting
two processes).<br class="">
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Best regards,<br class="">
Min<br class="">
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<div class="moz-cite-prefix">On 2018/11/04 10:27, Zhifeng Yang via discuss wrote:<br class="">
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<div dir="ltr" class="">Hi
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<div class="">After I installed mpich and used it in a FORTRAN code. There is an error while running this FORTRAN code called real.exe by using the following command</div>
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<div class="">$./real.exe</div>
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<div class="">$mpirun ./real.exe</div>
<div class="">real.exe: error: _get_addr: No such file or directory</div>
<div class="">real.exe: error: _get_addr: No such file or directory</div>
<div class="">real.exe: error: _get_addr: No such file or directory</div>
<div class="">Fatal error in MPI_Init: Other MPI error, error stack:</div>
<div class="">MPIR_Init_thread(784).....:</div>
<div class="">MPID_Init(1323)...........: channel initialization failed</div>
<div class="">MPIDI_CH3_Init(120).......:</div>
<div class="">MPID_nem_init_ckpt(852)...:</div>
<div class="">MPIDI_CH3I_Seg_commit(364): PMI_Barrier returned -1</div>
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<div class="">But while using mpirun with specifying number of processors. as follows</div>
<div class="">$mpirun -np 1 ./real.exe</div>
<div class="">There is no error any more. I am not sure why? do you have any explanation? Thank you very much</div>
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<div class="">Best regards</div>
<div class="">Zhifeng</div>
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