Introduction
mimi is currently (2025) the most powerful of the servers at Dept. of Geosciences. It has 256 CPUs (2 AMD EPYC 7742 64-core processors, with hyper-threading), and 1 TiB memory. It also has a fast, local NVMe-disk for scratch use, and a Nvidia Quadro RTX 6000 card, with 24GB GPU memory and 4608 CUDA cores.
mimi runs RedHat Enterprise Linux 8.
mimi is named after Wilhelmine "Mimi" Johnson.
Access & Use
mimi is free to use for all users at Dept. of Geosciences. If you are unable to log in, please get in touch.
There is no CPU quota or queuing system. You just run your jobs, and take care not to overwhelm the available resources.
To log in from a terminal window on a Linux or Mac machine, or from Windows with WSL and OpenSSH, use the command
ssh username@mimi.uio.no
where username is your UiO username.
There is a limit in place for virtual memory usage of ~250 GiB per process. This is a soft limit, the user can increase this to ~500 GiB with the ulimit command. E.g.
ulimit -v 400000000
Don't do this unless you need it! If you need this much memory, please consider using ivan.
Do's and don'ts
- As a rule of thumb, don't use more than half of the available resources (CPUs, memory, scratch space).
- Need to run something super-heavy? Run it during the night, or weekends.
- Check the load before you start a heavy calculation, and occasionally during execution. Consider interrupting or pausing your processes if resources become scarce.
Resources
Here's a list of links that could be useful when using mimi or ivan:
- Access from outside, how to access a Linux machine from outside UiO.
- Storage on hypatia, how access storage on hypatia from servers et al.
- Running programs, how to run your programs efficiently, without overloading the system.
- ssh tips and tricks, some handy ways to use ssh - the secure shell.
- Building software with Easybuild. With EasyBuild, you can build the software you need yourself.
- Using Servers, the parent document of this, also contains many useful pointers.