[mpich-discuss] Zero-copy non-contiguous types

[Zhou, Hui]

As long as the configure find the xpmem – use --with-xpmem= to set its installation path – it should configure and use xpmem for IPC by default.

There is environment variable MPIR_CVAR_CH4_XPMEM_ENABLE​ which is set to 1 by default.  And there is MPIR_CVAR_CH4_IPC_XPMEM_P2P_THRESHOLD​ which is set to 16384 by default.

--
Hui
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From: Pascal Boeschoten via discuss <discuss at mpich.org>
Sent: Wednesday, May 1, 2024 12:58 PM
Cc: Pascal Boeschoten <pascal.boeschoten at hapteon.com>; discuss at mpich.org <discuss at mpich.org>
Subject: Re: [mpich-discuss] Zero-copy non-contiguous types

Hello, Thanks. Besides compiling MPICH with xpmem support, are there any particular configuration options or environment variables needed for this to happen? Kind regards, Pascal Boeschoten On Mon, 29 Apr 2024 at 15: 54, Zhou, Hui <zhouh@ anl. gov>
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Hello,

Thanks. Besides compiling MPICH with xpmem support, are there any particular configuration options or environment variables needed for this to happen?

Kind regards,
Pascal Boeschoten

On Mon, 29 Apr 2024 at 15:54, Zhou, Hui <zhouh at anl.gov<mailto:zhouh at anl.gov>> wrote:
Yes, intra-node ipc including non-contig datatypes is supported via xpmem.

--
Hui Zhou
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From: Pascal Boeschoten via discuss <discuss at mpich.org<mailto:discuss at mpich.org>>
Sent: Monday, April 29, 2024 2:37 AM
To: discuss at mpich.org<mailto:discuss at mpich.org> <discuss at mpich.org<mailto:discuss at mpich.org>>
Cc: Pascal Boeschoten <pascal.boeschoten at hapteon.com<mailto:pascal.boeschoten at hapteon.com>>
Subject: [mpich-discuss] Zero-copy non-contiguous types

Hello, Does MPICH support zero-copy intra-node communication for non-contiguous datatypes? Thanks, Pascal Boeschoten ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍
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Hello,

Does MPICH support zero-copy intra-node communication for non-contiguous datatypes?

Thanks,
Pascal Boeschoten
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