Q: What's the ideal MPI number and thread number with current RELION APP?

A: 4 MPI with 4 threads. If it's GPU accelerated process, please use 5 MPI with 4 threads

Q: What's the ideal MPI number and thread number with Premium RELION v100 app?

A: The v100 GPU is relatively powerful GPU against GTX-1080Ti. So, it can bear much load than 1080ti. In principle, with following job setup, user can get pretty nice speed up when dealing 2D and 3D classifications:
2D: Number of MPI procs: 16, Number of Threads: 1
3D: Number of MPI procs: 9, Number of Threads: 2

Q: What if RELION encounters error?

A: RELION is often stable. When error occurs, it would usually caused by:
1. Memory or resources are not enough. For such error, simply reducing Thread number would just help. If the error lasts, then try reducing MPI number.
2. Input file error. Checking log and removing problematic file indicated in log may just solve this issue.


This article was last modified 12 months ago by Felix Lee.