[slurm-users] [External] Re: openmpi / UCX / srun

[Max Quast]

Hello Prentice, 

sorry for that. 

My post refers to a post by Dean Hidas on Mon Jun 17 17:40:56 UTC 2019:

 

> Hello,

> 

> I am trying to use ucx with slurm/pmix and run into the error below.  The
following works using mpirun, but what I was hoping was the srun equivalent
fails.  Is there some flag or configuration I might be missing for slurm?

> 

> Works fine:

> mpirun -n 100 --host apcpu-004:88,apcpu-005:88 --mca pml ucx --mca osc ucx
./hello

> 

> does not work:

> srun -n 100 ./hello

> slurmstepd: error: apcpu-004 [0] pmixp_dconn_ucx.c:668 [_ucx_connect]
mpi/pmix: ERROR: ucp_ep_create failed: Input/output error

> slurmstepd: error: apcpu-004 [0] pmixp_dconn.h:243 [pmixp_dconn_connect]
mpi/pmix: ERROR: Cannot establish direct connection to apcpu-005 (1)

> slurmstepd: error: apcpu-004 [0] pmixp_server.c:731
[_process_extended_hdr] mpi/pmix: ERROR: Unable to connect to 1

> slurmstepd: error: *** STEP 50.0 ON apcpu-004 CANCELLED AT
2019-06-17T13:30:11 ***

> 

> The configurations for pmix, openmpi, slurm, ucx are the following (on
Debian 8):

> pmix 3.1.2

> ./configure --prefix=/opt/apps/gcc-7_4/pmix/3.1.2

> 

> openmpi 4.0.1

> ./configure --prefix=/opt/apps/gcc-7_4/openmpi/4.0.1
--with-pmix=/opt/apps/gcc-7_4/pmix/3.1.2
--with-libfabric=/opt/apps/gcc-7_4/libfabric/1.7.2
--with-ucx=/opt/apps/gcc-7_4/ucx/1.5.1 --with-libevent=external
--disable-dlopen --without-verbs

> 

> slurm 19.05.0

> ./configure --enable-debug --enable-x11
--with-pmix=/opt/apps/gcc-7_4/pmix/3.1.2 --sysconfdir=/etc/slurm
--prefix=/opt/apps/slurm/19.05.0 --with-ucx=/opt/apps/gcc-7_4/ucx/1.5.1

> 

> ucx 1.5.1

> ./configure --enable-optimizations --disable-logging --disable-debug
--disable-assertions --disable-params-check
--prefix=/opt/apps/gcc-7_4/ucx/1.5.1

> 

> Any advice is much appreciated.

> 

> Best,

> 

> -Dean

 

>> Max, 

>> You didn't quote the original e-mail so I'm not sure what the original
problem was, or who "you" is. 

>> --

>> Prentice

>> On 8/12/20 6:55 AM, Max Quast wrote:

>> I am also trying to use ucx with slurm/PMIx and get the same error.  Also
mpirun with "--mca pml ucx" works fine.

>>  

>> Used versions: 

>> Ubuntu 20.04

>> slurm 20.02.4

>> OMPI 4.0.4

>> PMIx 3.1.5

>> UCX 1.9.0-rc1

>> OFED 4.9

>>  

>> With ucx 1.8.1 I got a slightly different error:

>> error: host1 [0] pmixp_dconn_ucx.c:245 [pmixp_dconn_ucx_prepare]
mpi/pmix: ERROR: Fail to init UCX: Unsupported operation

>> [2020-08-11T20:24:48.117] [2.0] error: host1 [0] pmixp_dconn.c:72
[pmixp_dconn_init] mpi/pmix: ERROR: Cannot get polling fd

>> [2020-08-11T20:24:48.117] [2.0] error: host1 [0] pmixp_server.c:402
[pmixp_stepd_init] mpi/pmix: ERROR: pmixp_dconn_init() failed

>> [2020-08-11T20:24:48.117] [2.0] error: (null) [0] mpi_pmix.c:161
[p_mpi_hook_slurmstepd_prefork] mpi/pmix: ERROR: pmixp_stepd_init() failed

>> [2020-08-11T20:24:48.119] [2.0] error: Failed mpi_hook_slurmstepd_prefork

>> [2020-08-11T20:24:48.121] [2.0] error: job_manager exiting abnormally, rc
= -1

>>  

>> Did you solve the problem?

>>  

>>  

>> Greetings,

>> Max

>> -- 

>> Prentice 

>> 

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