January 2020 - discuss - mailman3.cels.anl.gov

Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn
by Raffenetti, Kenneth J. 13 Jan '20

13 Jan '20

I'm afraid I don't have a great answer for this. Hydra, the default MPICH process manager, uses fork/execvp to launch (or spawn) MPI processes. But this happens at the node-level daemon. As you noted, this may not be safe to do from the MPI-level, particularly if using an RDMA network. If MPICH is not configured for RDMA (i.e. TCP/IP), fork/exec should be OK for creating non-MPI processes. Ken On 1/7/20 10:07 AM, Mccall, Kurt E. (MSFC-EV41) wrote: > Ken, > > Issue created. Can you suggest any other way to launch non-MPI processes? > > Thanks, > Kurt > > -----Original Message----- > From: Raffenetti, Kenneth J. <raffenet(a)mcs.anl.gov> > Sent: Tuesday, January 7, 2020 9:32 AM > To: discuss(a)mpich.org > Cc: Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall(a)nasa.gov> > Subject: [EXTERNAL] Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn > > We do not support such a key at this time, but it seems reasonable to add. Could you create an issue on our GitHub? > https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_pmodels_mpi… > > Thanks, > Ken > > On 1/6/20 9:50 AM, Mccall, Kurt E. (MSFC-EV41) via discuss wrote: >> I'm attempting to use MPICH to manage a number of non-MPI processes. >> The latter call system() and fork(), which as I understand it may >> cause undefined behavior if they were spawned as MPI processes. How >> do I use >> MPI_Comm_spawn() to launch these processes? >> >> For example, OpenMpi has a key for the "info" field named >> "ompi_non_mpi", which causes a non-MPI process to be spawned. Is >> there something similar in MPICH? >> >> Thanks, >> >> Kurt >> >> >> _______________________________________________ >> discuss mailing list discuss(a)mpich.org >> To manage subscription options or unsubscribe: >> https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.mpich.org_m >> ailman_listinfo_discuss&d=DwIF-g&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiM >> k5Csz9Zk&r=6cP1IfXu3IZOHSDh_vBqciYiIh4uuVgs1MSi5K7l5fQ&m=H8FYbetRLxBRS >> aC9l0ktwX7ok3zyPRdhUlWXZZq9nsc&s=cUS7Q28AAksa_KLLMwTztXCU3BiO0lIEKb-bM >> Wpcvfk&e= >>

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Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn
by Mccall, Kurt E. (MSFC-EV41) 07 Jan '20

07 Jan '20

Ken, Issue created. Can you suggest any other way to launch non-MPI processes? Thanks, Kurt -----Original Message----- From: Raffenetti, Kenneth J. <raffenet(a)mcs.anl.gov> Sent: Tuesday, January 7, 2020 9:32 AM To: discuss(a)mpich.org Cc: Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall(a)nasa.gov> Subject: [EXTERNAL] Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn We do not support such a key at this time, but it seems reasonable to add. Could you create an issue on our GitHub? https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_pmodels_mpi… Thanks, Ken On 1/6/20 9:50 AM, Mccall, Kurt E. (MSFC-EV41) via discuss wrote: > I'm attempting to use MPICH to manage a number of non-MPI processes. > The latter call system() and fork(), which as I understand it may > cause undefined behavior if they were spawned as MPI processes. How > do I use > MPI_Comm_spawn() to launch these processes? > > For example, OpenMpi has a key for the "info" field named > "ompi_non_mpi", which causes a non-MPI process to be spawned. Is > there something similar in MPICH? > > Thanks, > > Kurt > > > _______________________________________________ > discuss mailing list discuss(a)mpich.org > To manage subscription options or unsubscribe: > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.mpich.org_m > ailman_listinfo_discuss&d=DwIF-g&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiM > k5Csz9Zk&r=6cP1IfXu3IZOHSDh_vBqciYiIh4uuVgs1MSi5K7l5fQ&m=H8FYbetRLxBRS > aC9l0ktwX7ok3zyPRdhUlWXZZq9nsc&s=cUS7Q28AAksa_KLLMwTztXCU3BiO0lIEKb-bM > Wpcvfk&e= >

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Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn
by Raffenetti, Kenneth J. 07 Jan '20

07 Jan '20

We do not support such a key at this time, but it seems reasonable to add. Could you create an issue on our GitHub? https://github.com/pmodels/mpich Thanks, Ken On 1/6/20 9:50 AM, Mccall, Kurt E. (MSFC-EV41) via discuss wrote: > I’m attempting to use MPICH to manage a number of non-MPI processes. > The latter call system() and fork(), which as I understand it may cause > undefined behavior if they were spawned as MPI processes. How do I use > MPI_Comm_spawn() to launch these processes? > > For example, OpenMpi has a key for the “info” field named > “ompi_non_mpi”, which causes a non-MPI process to be spawned. Is there > something similar in MPICH? > > Thanks, > > Kurt > > > _______________________________________________ > discuss mailing list discuss(a)mpich.org > To manage subscription options or unsubscribe: > https://lists.mpich.org/mailman/listinfo/discuss >

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Re: [mpich-discuss] How to add user-defined lib in MPICH
by Raffenetti, Kenneth J. 07 Jan '20

07 Jan '20

What is the purpose of the library? What function does it provide for MPICH? Ken On 1/7/20 3:53 AM, wanghao via discuss wrote: > The lib HCOLL is added in the MPICH-3.2.1, so if I have a similarly > user-defined lib, how can I add it in MPICH? Is there an official > operating manual to help me? > > I sincerely hope that the mpich community gets better and better. > > Thank you. > > H.Wang > > > _______________________________________________ > discuss mailing list discuss(a)mpich.org > To manage subscription options or unsubscribe: > https://lists.mpich.org/mailman/listinfo/discuss >

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How to add user-defined lib in MPICH
by wanghao 07 Jan '20

07 Jan '20

The lib HCOLL is added in the MPICH-3.2.1, so if I have a similarly user-defined lib,  how can I add it in MPICH? Is there an official operating manual to help me? I sincerely hope that  the mpich community gets better and better. Thank you. H.Wang

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How to spawn a non-MPI process with MPI_Comm_spawn
by Mccall, Kurt E. (MSFC-EV41) 06 Jan '20

06 Jan '20

I'm attempting to use MPICH to manage a number of non-MPI processes. The latter call system() and fork(), which as I understand it may cause undefined behavior if they were spawned as MPI processes. How do I use MPI_Comm_spawn() to launch these processes? For example, OpenMpi has a key for the "info" field named "ompi_non_mpi", which causes a non-MPI process to be spawned. Is there something similar in MPICH? Thanks, Kurt

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