[Darshan-users] This darshan log has no file records. No summary was produced.

[Jérémy Fouriaux]

Hello everyone,

I enjoyed a lot working with installed darshan on HPC systems and I tried to install it on my Linux Ubuntu machine to profile posix related IOs.

Installation went fine using darshan 3.1.6

```

./configure CC=mpicc --prefix /home/jeremy/Devel/Darshan_try/ --with-mem-align=8 --with-log-path-by-env=DARSHAN_LOG_DIR --with-jobid-env=NONE

make && make install

```


Then I have intended to use darshan dynamic load mode with a sample program that write a file with 4k bytes:


```

include <fstream>
#include <cstdlib>
#include <mpi.h>
int main (int argc, char** argv) {
  MPI_Init (0, nullptr);
  std::ofstream output (argv[1], std::ofstream::binary);
  size_t size = atoi(argv[2]);
  char* buffer = new char[size];
  output.write (buffer, size);
  output.close();
  delete [] buffer;
  MPI_Finalize();
  return 0;
}
```

compiled with mpic++, backend compiler g++, mpi library: openmpi

```

mpic++ --std=c++14 my_program.cpp -o my_program

```

launched in a test.sh file:


```

#!/usr/bin/env sh
current_path=`pwd`
#export DARSHAN_LOGFILE=${current_path}/logs/darshan.log
export PATH=${PATH}:/home/jeremy/Devel/Darshan_try/bin
export DARSHAN_LOG_DIR=${current_path}/logs
rm -rf ${current_path}/logs
mkdir ${current_path}/logs
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/jeremy/Devel/Performances/Darshan/example/
export LD_PRELOAD=/home/jeremy/Devel/Darshan_try/lib/libdarshan.so
# writing 4k bytes in a file
mpirun -n 1 ./mpi_write_file test.txt 4000

darshan-job-summary.pl ${current_path}/logs/*
```


the output of darshan-job-summary is the following:

```

This darshan log has no file records. No summary was produced.
    jobid:  3881
      uid:  1000
starttime: Mo Okt 29 16:07:41 2018 ( 1540825661 )
  runtime:  1 (seconds)
   nprocs:  1
  version: 3.10


```


I don't really understand why there is no records for my file write of 4000 bytes, is there something I have done incorrectly ?

I have attached the darshan output file.



Best regards,

Jeremy.

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