MPCO file not generated properly (0 bytes) even though analysis runs successfully
Posted: Tue Aug 26, 2025 7:03 am
Hello,
I am working on a structural model in STKO and trying to perform an Eigen Analysis with an MPCO Recorder to visualize the modal shapes in the Post-Processor.
The analysis itself runs successfully (message: ANALYSIS SUCCESSFULLY FINISHED), and the file Results.mpco.cdata is created. However, the actual Results.mpco file is also generated but remains 0 bytes, so nothing can be opened in the Post-Processor.
What I did:
Added an MPCO Recorder in the Analysis Steps, placed before the Eigen step.
Gave a proper name (e.g., Results).
Checked Nodal results → displacement and modesOfVibration.
Also tried adding Element results (force, deformation, localForce).
Ran Write Input File and then executed main.tcl with OpenSees (3.7.1 64-bit).
The analysis runs without any error, but the .mpco database remains empty (0 bytes).
What I expected:
Both Results.mpco and Results.mpco.cdata files with actual results that can be opened in the Post-Processor.
Has anyone experienced this behavior? Could it be related to my recorder configuration or file path issues?
I have attached my full project folder (scd + tcl files) for reference.
Thank you very much for your help.
Best regards,
Hongki Park
I am working on a structural model in STKO and trying to perform an Eigen Analysis with an MPCO Recorder to visualize the modal shapes in the Post-Processor.
The analysis itself runs successfully (message: ANALYSIS SUCCESSFULLY FINISHED), and the file Results.mpco.cdata is created. However, the actual Results.mpco file is also generated but remains 0 bytes, so nothing can be opened in the Post-Processor.
What I did:
Added an MPCO Recorder in the Analysis Steps, placed before the Eigen step.
Gave a proper name (e.g., Results).
Checked Nodal results → displacement and modesOfVibration.
Also tried adding Element results (force, deformation, localForce).
Ran Write Input File and then executed main.tcl with OpenSees (3.7.1 64-bit).
The analysis runs without any error, but the .mpco database remains empty (0 bytes).
What I expected:
Both Results.mpco and Results.mpco.cdata files with actual results that can be opened in the Post-Processor.
Has anyone experienced this behavior? Could it be related to my recorder configuration or file path issues?
I have attached my full project folder (scd + tcl files) for reference.
Thank you very much for your help.
Best regards,
Hongki Park