Hi Hui On Thu, May 27, 2021 at 7:28 PM Zhou, Hui <[email protected]> wrote:

Similar issues can be very different in causes. Checking the referenced discussion, I wasn’t sure what was the original issues. We suggested to try ch4 as to get more data points rather than as a solution. Nevertheless, ch4 is the current recommended device as it is more actively developed.

Ch3 is not broken as far as we know. Could you describe your issue in more details?

I get Assertion failed in file src/mpid/ch3/channels/nemesis/src/ch3_progress.c at line 530: payload_len >= sizeof (MPIDI_CH3_Pkt_t) after some loop. or sometime I see like : Assertion failed in file src/mpid/ch3/channels/nemesis/src/ch3_progress.c at line 567: !vc_ch->recv->active The number of pass loop does depends on number of CPUs used. (more number of CPUs more failure). With One CPU, no failure.

-- Hui Zhou

From: Alim Akhtar via discuss <[email protected]> Date: Wednesday, May 26, 2021 at 10:51 PM To: [email protected] <[email protected]> Cc: Alim Akhtar <[email protected]> Subject: [mpich-discuss] mpich3 error with ch3

Hi mpich dev team,

I am facing one issue similar to discussed in below discussion

https://lists.mpich.org/pipermail/devel/2021-January/000826.html

Someone in the mailing list suggested recompiling the mpi bench using CH4. as below:

https://lists.mpich.org/pipermail/devel/2021-January/000828.html

"MPICH with ch4, with `--with-device=ch4:ofi`"

Actually this fixes the failure on this CPU architecture.

Questions: 1. Is this a known issue with MPI bench on the recent CPU architecture? (I am running on ARM's Cortex -A 75), like ch3 is broken? 2. With no error after using CH4, does this mean the CPU is all good?

Note: using ch3 was working fine on our previous CPU (A-72)

Any input will be really appreciated.

-- Regards, Alim _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

-- Regards, Alim