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 ________________________________ From: Pascal Boeschoten via discuss <[email protected]> Sent: Wednesday, May 1, 2024 12:58 PM Cc: Pascal Boeschoten <[email protected]>; [email protected] <[email protected]> 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> ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd 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 <[email protected]<mailto:[email protected]>> wrote: Yes, intra-node ipc including non-contig datatypes is supported via xpmem. -- Hui Zhou ________________________________ From: Pascal Boeschoten via discuss <[email protected]<mailto:[email protected]>> Sent: Monday, April 29, 2024 2:37 AM To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Cc: Pascal Boeschoten <[email protected]<mailto:[email protected]>> Subject: [mpich-discuss] Zero-copy non-contiguous types Hello, Does MPICH support zero-copy intra-node communication for non-contiguous datatypes? Thanks, Pascal Boeschoten ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hello, Does MPICH support zero-copy intra-node communication for non-contiguous datatypes? Thanks, Pascal Boeschoten