RELION (REgularised LIkelihood OptimisatioN) is a stand-alone computer program for the refinement of 3D reconstructions or 2D class averages in electron cryo-microscopy.
RELION is available on the OSC clusters. The versions currently available at OSC are:
| Version | Pitzer | Ascend | Note |
|---|---|---|---|
| 3.1-cuda10.1 | X | Built with CUDA 10.1 | |
| 4.0-cuda10.1 | X | RELION 4.0 beta2 Built with CUDA 10.1 |
|
| 4.0.1 | X | Built with CUDA 10.2 (11.8 for Ascend) | |
| 5.0b | X | Built with CUDA 11.8 | |
| 5.0 | X | Built with CUDA 11.8 and OpenMPI |
You can use module spider relion to view available modules for a given machine. Feel free to contact OSC Help if you need other versions for your work.
| Cluster | RELION | CTFFIND | MotionCor2 | GCTF | ResMap | Unblur & Summovie |
|---|---|---|---|---|---|---|
| Pitzer | 4.0.1, 5.0b | 4.1.14 | 1.4.4 | 1.18 | 1.1.4 | 1.0.2 |
| Ascend | 5.0 | 4.1.14 | 1.4.5 |
RELION is available to all OSC users.
MRC Lab of Molecular Biology, Open source
To set up the environment for RELION on the Pitzer cluster, use the command:
module load relion/version
where version is chosen from the available versions (omitting the version will load the default version).
Hybrid MPI+OpenMP jobs utilizing programs built with the Intel compiler and MVAPICH2 may experience hangs when running on multiple nodes. This issue is attributed to a known problem in MVAPICH2 built with the Intel compiler stack.
All versions of Intel+MVAPICH2 have been removed to address this issue.
RELION versions prior to 5 may exhibit poor performance in hybrid MPI+OpenMP jobs when the number of MPI tasks exceeds 4 on multiple nodes.
If possible, limit the number of MPI tasks to 4 or less for optimal performance. Consider using RELION version 5 or later, as newer versions may include optimizations and improvements that address this performance issue.