LDAS @ LIGO-Livingston¶

Key information
Home page
Account sign-up	See Requesting an account on the LDG page
Support	ldas_admin_llo@ligo.caltech.edu
SSH CA Cert	`@cert-authority * ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBP68UP/uHcsHPUgZmy2WFK6fyhus937RqGQQ7lZuXwkCiu7g25hL3drV9CYEcy+Vcze3tIDyvPUR6FLSsdVUbNs= LLO_SSH_CERT_AUTHORITY`

This service is available for all @LIGO.ORG registered collaboration members with accounts and access coordinated as part of the LIGO Data Grid.

Hostname	Description	Memory	CPU model	# core	GPU
`ldas-grid.ligo-la.caltech.edu`	Production submit	64GB	2 x 2.4GHz Xeon E5-2630v3	16
`ldas-pcdev1.ligo-la.caltech.edu`	Large mem/post-processing	128GB	2 x 2.4GHz Xeon E5-2630v3	16
`ldas-pcdev2.ligo-la.caltech.edu`	Large mem/post-processing	512GB	4 x 2.7GHz Xeon E5-4650	32	4 x Tesla K10 + 2 x GTX750
`ldas-pcdev4.ligo-la.caltech.edu`		16GB	2 x AMD Opteron 2376	8
`ldas-pcdev5.ligo-la.caltech.edu`		512GB	2 x 2.2GHz Xeon E5-2698v4	40
`ldas-pcdev6.ligo-la.caltech.edu`		1.5TB	4 x 3.0GHz Xeon Gold 6154	72
`detchar.ligo-la.caltech.edu`	Dedicated DetChar	128GB	2 x 2.4GHz Xeon E5-2630v3	16
`dgx1.ligo-la.caltech.edu`		512GB	2 x 2.2GHz Xeon E5-2698v4	40	8 x Tesla V100-SXM2-16GB

For details on how to connect to these machines, please see Access to the LIGO Data Grid.

Additional services¶

Service	URL
JupyterLab	https://jupyter.ligo-la.caltech.edu
User webspace	https://ldas-jobs.ligo-la.caltech.edu/~USER/

Configuring your user environment on LDAS¶

This page describes the default user environments on LDAS, and how to customise availability and versions of the following software distributions:

Intel oneAPI¶

The Intel oneAPI Base Toolkit is available by default on LDAS, with the exception of the intelpython and mpi modules.

Disabling all Intel modules¶

To disable loading of all Intel oneAPI modules, create an empty file in your home directory called ~/.nointel:

touch ~/.nointel

Customising the included oneAPI modules¶

To take full control over which modules to include/exclude (including pinning specific versions) please create ~/.oneapi_config.txt that takes precedence over the default /opt/intel/oneapi/oneapi_config.txt

MATLAB¶

Enabling MATLAB¶

MATLAB is available on the command path by default, and can be discovered using which:

$ which matlab
/ldcg/matlab_r2015a/bin/matlab

Note

The default matlab version will be updated from time-to-time according to approval from the Software Change Control Board.

Enabling a specific version of MATLAB

To select a specific version of MATLAB, create a file in your ${HOME} directory named .usematlab_{release}, where {release} is the release number of MATLAB that you want, e.g:

touch ~/.usematlab_r2019a

Listing available MATLAB releases

To list the available MATLAB releases, just run this:

ls /ldcg/ | grep matlab

Disabling MATLAB¶

Disabling MATLAB

To opt out of all MATLAB releases, create a file in your ${HOME} directory named .nomatlab:

touch ~/.nomatlab

Warning

~/.nomatlab takes precedence over any ~/.usematlab_* files, so if you want to opt in after previously opting out, make sure and remove the old ~/.nomatlab file.