Servers
The PHYMATH and IDCS calculation servers¶
CMAP is member and co-founder of the mesocenter of the Ecole Polytechnique. The mesocenter of the Ecole Polytechnique was born from the initiative of research units (CMLS - CPHT - CMAP - LPP) to pool their IT resources around the High Performance Computing (HPC) field within the IPP (Institut Polytechnique de Paris) campus. These resources are guaranteed by a collaboration of engineers attached to each of IPP’s partner laboratories.
| Machine | DNS name | Description |
|---|---|---|
| Cholesky | cholesky.mesocentre.idcs.polytechnique.fr |
cf. documentation |
Once you have been added to a project, you will be able to connect to the cluster.
The Cholesky cluster is accessible using the Polytechnique VPN, or from the CMAP SSH gateway. It is possible to jump directly from your PC to the cluster though the SSH gateway by editing the ~/.ssh/config file on your computer:
Host cholesky
HostName cholesky.mesocentre.idcs.polytechnique.fr
User firstane.lastname #to be adapted according to your credentials
IdentityFile ~/.ssh/id_rsa #enter here the path to your private key
ProxyJump firstname.lastane@ssh.cmap.polytechnique.fr
Ensuite, pour se connecter :
$ ssh cholesky
The CMAP calculation servers¶
CMAP also provides some multi-processor machines (i.e. Boosted PCs).
Warning
Starting in December 2021, the computing machines will gradually be upgraded from CentOS 7 to Rocky Linux 8. This upgrade comes with changes in the use of scientific software. See https://intranet.cmap.polytechnique.fr/modules for the corresponding documentation.
Warning
When you connect to one of the computing machines, if you get a warning message about the server’s fingerprint having changed "WARNING : REMOTE HOST IDENTIFICATION HAS CHANGED ! IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY !" You should delete the line that begins with the name of the machine from the ~/.ssh/known_hosts file.
| Machine | CPU | Frequency | Memory | OS |
|---|---|---|---|---|
| porte-d-auteuil | 12 cores | 2,9 GHz | 192 Go | Rocky Linux 8 |
| porte-d-orleans | 20 cores | 2,4 GHz | 256 Go | Rocky Linux 8 |
| porte-de-choisy | 36 cores | 3,0 Ghz | 512 Go | Rocky Linux 8 |
| porte-de-la-chapelle | 8 cores | 3,3 Ghz | 128 Go | Rocky Linux 8 |
| republique | 16 cores | 3,2 GHz | 128 Go | Rocky Linux 8 |
| porte-pouchet | 12 cores | 3,0 GHz | 146 Go | Rocky Linux 8 |
| porte-brancion | 12 cores | 3,0 GHz | 48 Go | Rocky Linux 8 |
Usage¶
- Direct execution of the programs with ssh (no queue management).
- Free access, you must select the least loaded machine yourself (use 'ordistat' to check the load of all machines).
- No constraint on the execution time, but you must not use more than one machine simultaneously (decision of the ’GT ressources de calcul’).
Priority periods¶
Due to the overall high load on these machines, you may want to notify the IT team of times when you need priority access to these machines. These times will be listed below and a login message will be added to the affected machines.
No priority periods reported at this time