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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.</div>
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There is environment variable <code>MPIR_CVAR_CH4_XPMEM_ENABLE</code> which is set to 1 by default. And there is
<code>MPIR_CVAR_CH4_IPC_XPMEM_P2P_THRESHOLD</code> which is set to 16384 by default.</div>
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Hui</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Pascal Boeschoten via discuss <discuss@mpich.org><br>
<b>Sent:</b> Wednesday, May 1, 2024 12:58 PM<br>
<b>Cc:</b> Pascal Boeschoten <pascal.boeschoten@hapteon.com>; discuss@mpich.org <discuss@mpich.org><br>
<b>Subject:</b> Re: [mpich-discuss] Zero-copy non-contiguous types</font>
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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@ anl. gov>
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<div>Hello,<br>
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<div>Thanks. Besides compiling MPICH with xpmem support, are there any particular configuration options or environment variables needed for this to happen?<br>
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<div>Kind regards,<br>
Pascal Boeschoten</div>
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<div dir="ltr" class="x_gmail_attr">On Mon, 29 Apr 2024 at 15:54, Zhou, Hui <<a href="mailto:zhouh@anl.gov">zhouh@anl.gov</a>> wrote:<br>
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Yes, intra-node ipc including non-contig datatypes is supported via xpmem.</div>
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Hui Zhou</div>
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<div id="x_m_-5452879090950862313divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Pascal Boeschoten via discuss <<a href="mailto:discuss@mpich.org" target="_blank">discuss@mpich.org</a>><br>
<b>Sent:</b> Monday, April 29, 2024 2:37 AM<br>
<b>To:</b> <a href="mailto:discuss@mpich.org" target="_blank">discuss@mpich.org</a> <<a href="mailto:discuss@mpich.org" target="_blank">discuss@mpich.org</a>><br>
<b>Cc:</b> Pascal Boeschoten <<a href="mailto:pascal.boeschoten@hapteon.com" target="_blank">pascal.boeschoten@hapteon.com</a>><br>
<b>Subject:</b> [mpich-discuss] Zero-copy non-contiguous types</font>
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Hello, Does MPICH support zero-copy intra-node communication for non-contiguous datatypes? Thanks, Pascal Boeschoten
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<div dir="ltr">Hello,<br>
<br>
Does MPICH support zero-copy intra-node communication for non-contiguous datatypes?<br>
<br>
Thanks,<br>
Pascal Boeschoten</div>
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