[slurm-users] [pmix] [Cross post - Slurm, PMIx, UCX] Using srun with SLURM_PMIX_DIRECT_CONN_UCX=true fails with input/output error

Thu Oct 22 14:20:01 UTC 2020

was there ever a result to this?  i'm seeing the same error message,
but i'm not adding in all the environ flags like the original poster.

On Wed, Jul 10, 2019 at 9:18 AM Daniel Letai <dani at letai.org.il> wrote:
>
> Thank you Artem,
>
>
> I've made a mistake while typing the mail, in all cases it was 'OMPI_MCA_pml=ucx' and not as written. When I went over the mail before sending, I must have erroneously 'fixed' it for some reason.
>
>
> ----
>
> Best regards,
>
> --Dani_L.
>
>
> On 7/9/19 9:06 PM, Artem Polyakov wrote:
>
> Hello, Daniel
>
> Let me try to reproduce locally and get back to you.
>
> ----
> Best regards,
> Artem Y. Polyakov, PhD
> Senior Architect, SW
> Mellanox Technologies
> ________________________________
> От: pmix at googlegroups.com <pmix at googlegroups.com> от имени Daniel Letai <dani at letai.org.il>
> Отправлено: Tuesday, July 9, 2019 3:25:22 AM
> Кому: Slurm User Community List; pmix at googlegroups.com; ucx-group at elist.ornl.gov
> Тема: [pmix] [Cross post - Slurm, PMIx, UCX] Using srun with SLURM_PMIX_DIRECT_CONN_UCX=true fails with input/output error
>
>
> Cross posting to Slurm, PMIx and UCX lists.
>
>
> Trying to execute a simple openmpi (4.0.1) mpi-hello-world via Slurm (19.05.0) compiled with both PMIx (3.1.2) and UCX (1.5.0) results in:
>
>
> [root at n1 ~]# SLURM_PMIX_DIRECT_CONN_UCX=true SLURM_PMIX_DIRECT_CONN=true OMPI_MCA_pml=true OMPI_MCA_btl='^vader,tcp,openib' UCX_NET_DEVICES='mlx4_0:1'  SLURM_PMIX_DIRECT_CONN_EARLY=false UCX_TLS=rc,shm srun --export SLURM_PMIX_DIRECT_CONN_UCX,SLURM_PMIX_DIRECT_CONN,OMPI_MCA_pml,OMPI_MCA_btl, UCX_NET_DEVICES,SLURM_PMIX_DIRECT_CONN_EARLY,UCX_TLS --mpi=pmix -N 2 -n 2 /data/mpihello/mpihello
>
>
> slurmstepd: error: n1 [0] pmixp_dconn_ucx.c:668 [_ucx_connect] mpi/pmix: ERROR: ucp_ep_create failed: Input/output error
> slurmstepd: error: n1 [0] pmixp_dconn.h:243 [pmixp_dconn_connect] mpi/pmix: ERROR: Cannot establish direct connection to n2 (1)
> slurmstepd: error: n1 [0] pmixp_server.c:731 [_process_extended_hdr] mpi/pmix: ERROR: Unable to connect to 1
> srun: Job step aborted: Waiting up to 32 seconds for job step to finish.
> slurmstepd: error: n2 [1] pmixp_dconn_ucx.c:668 [_ucx_connect] mpi/pmix: ERROR: ucp_ep_create failed: Input/output error
> slurmstepd: error: n2 [1] pmixp_dconn.h:243 [pmixp_dconn_connect] mpi/pmix: ERROR: Cannot establish direct connection to n1 (0)
> slurmstepd: error: *** STEP 7202.0 ON n1 CANCELLED AT 2019-07-01T13:20:36 ***
> slurmstepd: error: n2 [1] pmixp_server.c:731 [_process_extended_hdr] mpi/pmix: ERROR: Unable to connect to 0
> srun: error: n2: task 1: Killed
> srun: error: n1: task 0: Killed
>
>
> However, the following works:
>
>
> [root at n1 ~]# SLURM_PMIX_DIRECT_CONN_UCX=false SLURM_PMIX_DIRECT_CONN=true OMPI_MCA_pml=true OMPI_MCA_btl='^vader,tcp,openib' UCX_NET_DEVICES='mlx4_0:1'  SLURM_PMIX_DIRECT_CONN_EARLY=false UCX_TLS=rc,shm srun --export SLURM_PMIX_DIRECT_CONN_UCX,SLURM_PMIX_DIRECT_CONN,OMPI_MCA_pml,OMPI_MCA_btl, UCX_NET_DEVICES,SLURM_PMIX_DIRECT_CONN_EARLY,UCX_TLS --mpi=pmix -N 2 -n 2 /data/mpihello/mpihello
>
>
> n2: Process 1 out of 2
> n1: Process 0 out of 2
>
>
> [root at n1 ~]# SLURM_PMIX_DIRECT_CONN_UCX=false SLURM_PMIX_DIRECT_CONN=true OMPI_MCA_pml=true OMPI_MCA_btl='^vader,tcp,openib' UCX_NET_DEVICES='mlx4_0:1'  SLURM_PMIX_DIRECT_CONN_EARLY=true UCX_TLS=rc,shm srun --export SLURM_PMIX_DIRECT_CONN_UCX,SLURM_PMIX_DIRECT_CONN,OMPI_MCA_pml,OMPI_MCA_btl, UCX_NET_DEVICES,SLURM_PMIX_DIRECT_CONN_EARLY,UCX_TLS --mpi=pmix -N 2 -n 2 /data/mpihello/mpihello
>
>
> n2: Process 1 out of 2
> n1: Process 0 out of 2
>
>
> Executing mpirun directly (same env vars, without the slurm vars) works, so UCX appears to function correctly.
>
>
> If both SLURM_PMIX_DIRECT_CONN_EARLY=true and SLURM_PMIX_DIRECT_CONN_UCX=true then I get collective timeout errors from mellanox/hcoll and glibc detected /data/mpihello/mpihello: malloc(): memory corruption (fast)
>
>
> Can anyone help using PMIx direct connection with UCX in Slurm?
>
>
>
>
> Some info about my setup:
>
>
> UCX version
>
> [root at n1 ~]# ucx_info -v
>
> # UCT version=1.5.0 revision 02078b9
> # configured with: --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --target=x86_64-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --disable-optimizations --disable-logging --disable-debug --disable-assertions --enable-mt --disable-params-check
>
>
> Mellanox OFED version:
>
> [root at n1 ~]# ofed_info -s
> OFED-internal-4.5-1.0.1:
>
>
> Slurm:
>
> slurm was built with:
> rpmbuild -ta slurm-19.05.0.tar.bz2 --without debug --with ucx --define '_with_pmix --with-pmix=/usr'
>
>
> PMIx:
>
> [root at n1 ~]# pmix_info -c --parsable
> config:user:root
> config:timestamp:"Mon Mar 25 09:51:04 IST 2019"
> config:host:slurm-test
> config:cli: '--host=x86_64-redhat-linux-gnu' '--build=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info'
>
>
> Thanks,
>
> --Dani_L.
>
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