compute_resources

Access

The compute nodes can be accessed by SSH only from inside I-MATH.
Use thinlinc
- matlab, mathematica, maple, R, rstudio: just start the application via menu 'Applications > Science > ...' - you'll automatically be redirected to the appropriate compute server.
- For non standard compute software please first log on the compute node via 'ssh', then start the program.
SSH: Log onto 'ssh.math.uzh.ch' and jump to the compute node again via 'ssh'.

All compute servers use the same applications and versions as installed on the thinlinc terminals.
Please report missing or outdated software or wishes to support@math.uzh.ch .
There is no Intel C or Intel Fortran Compiler.
If you need other program versions than the default one: open a terminal, type the program name followed by two 'TAB' presses: this will show all available installed versions of the specified program.

Cluster software
- Not installed / offered at I-MATH.
- Various MPI packages and libs are installed. Compiling and preparation to run programs later on a distributed compute cluster are possible.
Some programs, like matlab, offer limited built-in auto parallelization.
All of the compute nodes are shared memory machines. It's reasonable to start as many programs in parallel as long the load is less or equal the number of cores.
- Determine the load by using the command uptime via a terminal. The last three numbers are the average number of jobs (=load) in the run queue over the last 1, 5 and 15 minutes.
```
$ uptime
 15:55:20 up 22 days, 24 min,  1 user,  load average: 11.97, 11.73, 11.62
```

$ ulimit -m unlimited
$ ulimit -u 4096

Make sure to increase a hard limit only one time. If you try to increase it a second time, you'll get an error. You have to log out and log in again to get a new chance.