Compute Resources

Contents

Reservations

Short (<1day) computations don't need a reservation,
Longer (>1day) are reccomended to be done with a reservation.
With reservation: In case of maintenance need, we typically schedule the maintenance according to the needs of the user.
Without reservation: We try to contact the user and wait several hours for an answer.
General: if we see running computations, we always contact the user first (independent of whether or not a reservation exists). If the user doesn't answer (weekend, holiday, ...) we decide on our own what to do.

For small / ad hoc computations, just start the compute software via the thinlinc environment.
For medium computations, please contact support@math.uzh.ch to ask for the best fitting possibilty and to reserve nodes.
For large computations and professional support please check http://www.s3it.uzh.ch/.

host	CPU type	cores	RAM	local disk	date	purpose	CPU specs
asprey	2 x Intel Xeon 4C E5-2643 3.30 GHz	16 (HT enabled)	128 GB	73 GB	12/2012	student: matlab, mathematica, maple, R	E5-2643
crous	8 x Intel Xeon 10C E7-2850 2.0 GHz	80 (HT disabled)	2 TB	300 GB	05/2013	research	E7-2850
david	"	"	"	"	"	magma host (temporary)	"
estonia0	2 x Intel Xeon 6C E5-2640 2.50 GHz	12 (HT disabled)	256 GB	2TB	05/2013	research	E5-2640
estonia1	"	"	"	"	"	"	"
estonia2	"	"	"	"	"	"	"
estonia3	"	"	"	"	"	"	"
georgia0	"	"	"	"	"	"	"
georgia1	"	"	"	"	"	"	"
georgia2	"	"	"	"	"	"	"
georgia3	"	"	"	"	"	"	"
iran0	"	"	"	"	"	"	"
iran1	"	"	"	"	"	"	"
iran2	"	"	"	"	"	"	"
iran3	"	"	"	"	"	"	"
jordan0	"	"	"	"	"	professor & assistant: matlab, mathematica, maple, R	"
jordan1	"	"	"	"	"	"	"
jordan2	"	"	"	"	"	courses	"
jordan3	"	"	"	"	"	courses	"
brady	1 x Intel Core 6C i7-8700K 3.70GHz	12 (HT enabled)	64GB	80GB,2TB	02/2018		i7-8700K

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Please report missing or outdated software or wishes to support@math.uzh.ch .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.