Hi Zoya, Did you run the darshan-mk-log-dirs.pl script that installs with darshan-runtime? That has to be run first to format the output log directory —when using --log-path option to Darshan, it will output files in year/month/day subdirectories in the file path you give it. Thanks, --Shane ________________________________ From: Darshan-users <[email protected]> on behalf of Zoya Masih <[email protected]> Sent: Monday, November 18, 2024 2:51 AM To: [email protected] <[email protected]> Subject: [Darshan-users] darshan_library_warning Hello, I have installed Darshan version 3. 4. 6 on an HPC cluster with the following configuration: ./configure --enable-mmap-logs --with-log-path=/mnt/lustre-grete/usr/u11509/DARSHAN/darshan-logs --with-jobid-env=PBS_JOBID --prefix=/path/to/DARSHAN/ ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hello, I have installed Darshan version 3.4.6 on an HPC cluster with the following configuration: ./configure --enable-mmap-logs --with-log-path=/mnt/lustre-grete/usr/u11509/DARSHAN/darshan-logs --with-jobid-env=PBS_JOBID --prefix=/path/to/DARSHAN/ CC=mpicc The installation of darshan-runtime and darshan-util is correctly done. Then I followed the instructions: 1- export LD_PRELOAD=/path/to/lib/libdarshan.so 2- export DARSHAN_ENABLE_NONMPI=1 3- python Hello_world.py I get this error: darshan_library_warning: unable to create log file /path/to/darshan-logs/2024/11/18/u11509_python_id1736997-1736997_11-18-34797-17835898535848440029.darshan_partial. The code is siply a hello world code, and python package doesn't have any problem. The permissions are also met. Would you please help me understand the issue? Sincerely Zoya Masih