Reply To: Interruption during design optimisation in ANSYS APDL

[Aniket]

The error you're encountering, known as a Segmentation Violation, is indeed often related to memory issues. It can occur when the program tries to access a memory location that it's not allowed to, which can be due to various reasons. Here are some possible solutions:

1. **Balancing CPU, Memory, and I/O**: To achieve good overall performance, it's crucial to have the correct balance of processors, memory, and disk I/O. The CPU speed is an obvious factor of performance. However, the other two factors—memory and disk I/O—are not always so obvious. Large amounts of memory can not only extend the model size that can be simulated on a given machine but also play a significant role in achieving optimal performance https://ansyshelp.ansys.com/Views/Secured/corp/v232/en/ans_per/percpumemio.html

2. For desktop systems and many cluster configurations, it's important to understand that many cores share the same disk resources. Therefore, obtaining fast I/O performance in applications such as Mechanical APDL is often not as simple as adding a fast RAID0 configuration. Performance is best when solver I/O can be eliminated or when multiple nodes are used for parallel runs, each with a separate local I/O resource: https://ansyshelp.ansys.com/Views/Secured/corp/v232/en/ans_per/perioansys.html

3. If Mechanical APDL simulations can run with all file I/O cached by a large amount of physical memory, then disk resources can be concentrated on storage more than performance. A good rule of thumb is to have 10 times more disk space than physical memory available for your simulation

4. If all fails, and memory upgrade is not possible, you can try to reduce your model size

-Aniket

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