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Subject: [OMPI users] Deadly warning "Epoll ADD(4) on fd 2 failed." ?
From: Filippo Spiga (spiga.filippo_at_[hidden])
Date: 2014-05-27 04:22:20

Dear all,

I am using Open MPI v1.8.2 night snapshot compiled with SLURM support (version 14.03pre5). These two messages below appeared during a job of 2048 MPI that died after 24 hours!

[warn] Epoll ADD(1) on fd 0 failed. Old events were 0; read change was 1 (add); write change was 0 (none): Operation not permitted

[warn] Epoll ADD(4) on fd 2 failed. Old events were 0; read change was 0 (none); write change was 1 (add): Operation not permitted

The first one, appeared immediately at the beginning had no effect. The application started to compute and it successfully called a big parallel eigensolver. The second message appeared after 18~19 hours of non-stop computation and the application crashed without showing any other error message! Regularly I was checking that MPI processes were not stuck, after this message the processes were all aborted without dumping anything on stdout/stderr. It is quite weird.

I believe these messages come from Open MPI (but correct me if I am wrong!). I am going to look at the application and the various libraries to find out if something is wrong. In the meanwhile it will be a great help if anyone can clarify the exact meaning of these warning messages.

Many thanks in advance.


Mr. Filippo SPIGA, M.Sc. ~ skype: filippo.spiga
«Nobody will drive us out of Cantor's paradise.» ~ David Hilbert
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