I'm a new user of nvprof and I got an error when I tried to use nvprof to profile my code. I added some OpenACC directives to my code. The cuda toolkit I used is Cuda8.0. My code is written in fortran90+OpenMPI. I used 16 cores for parallel computing. Here is the script I used to submit the code:
#!/bin/bash -l
#
#SBATCH --nodes=1
#SBATCH --ntasks=16
#SBATCH --ntasks-per-node=24
#SBATCH --ntasks-per-core=2
#SBATCH --cpus-per-task=1
#SBATCH --constraint=gpu
#SBATCH --time=24:00:00
#SBATCH --account=s807
export OMP_NUM_THREADS=$SLURM_CPUS_PER_TASK
export CRAY_CUDA_MPS=1
export TMPDIR=/scratch/snx3000/guow/Incompact3d_GPU/test1
export PGI_ACC_TIME=1
set -ex
# set some parameters
OUT=log.txt
#WMIN=1400
NP=16
# tasks: $SLURM_NTASKS
# tasks-per-node: $SLURM_NTASKS_PER_NODE
# cpus-per-task: $SLURM_CPUS_PER_TASK
srun nvprof -o nvprof.out ./incompact3d $WMIN >> $OUT
The job is terminated after running for several seconds and I got the error message below:
+ OUT=log.txt
+ NP=16
+ srun nvprof -o nvprof.out ./incompact3d
==20144== NVPROF is profiling process 20144, command: ./incompact3d
==20148== NVPROF is profiling process 20148, command: ./incompact3d
==20140== NVPROF is profiling process 20140, command: ./incompact3d
==20133== NVPROF is profiling process 20133, command: ./incompact3d
==20134== NVPROF is profiling process 20134, command: ./incompact3d
==20150== NVPROF is profiling process 20150, command: ./incompact3d
==20146== NVPROF is profiling process 20146, command: ./incompact3d
==20128== NVPROF is profiling process 20128, command: ./incompact3d
==20154== NVPROF is profiling process 20154, command: ./incompact3d
==20156== NVPROF is profiling process 20156, command: ./incompact3d
==20152== NVPROF is profiling process 20152, command: ./incompact3d
==20136== NVPROF is profiling process 20136, command: ./incompact3d
==20130== NVPROF is profiling process 20130, command: ./incompact3d
==20158== NVPROF is profiling process 20158, command: ./incompact3d
==20138== NVPROF is profiling process 20138, command: ./incompact3d
==20142== NVPROF is profiling process 20142, command: ./incompact3d
==20146== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20142== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20138== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20133== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20134== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20136== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
==20156== Error: Cannot create profiling file: /scratch/snx3000/guow/Incompact3d_GPU/test2_OpenAcc/nvprof.out
srun: First task exited 30s ago
srun: tasks 0,4,6-7,9-13: running
srun: tasks 1-3,5,8,14-15: exited
srun: Terminating job step 3892463.0
slurmstepd: error: *** STEP 3892463.0 ON nid04439 CANCELLED AT 2017-10-12T15:04:00 ***
srun: Job step aborted: Waiting up to 32 seconds for job step to finish.
srun: error: nid04439: tasks 0,4,6-7,9-13: Killed
srun: Terminating job step 3892463.0
A nvprof.out file is generated but nothing is shown when I use the command "nvvp nvprof.out" to check it. Have you ever met this kind of situation before? Any suggestions will be appreciated!
Try using the command:
srun nvprof -o nvprof.%p.out ./incompact3d $WMIN >> $OUT
"%p" will get filled in with the process ID for each MPI Rank so each rank will output it's profile to different files. Otherwise, all the ranks are trying to use the same file which can cause problems.