Accounts and Resources

A description of the LCLS computing resources can be found at the PCDS Computing page.

Setting Up the Software Environment

For the analysis software to work correctly it has to run in a correct environment. LCLS Analysis environment consists of few environment variables that either point to a location of specific directories or define some configuration options such as type of the machine, compiler versions, etc. Users do not need to set environment variables manually, instead users need to execute just one simple command which defines the complete environment. The command that needs to be run from Bourne-type shell (e.g. bash) is:

...

The <test-release> place holder is the absolute path to test release which is a release that is based on a base release (in $SIT_RELEASE). All these variables could be set manually, but there is a single convenience script which can be sourced from the user's shell which does all the tedious work.

Setup scripts and their effect

Regular way to handle environment setup would be to use a special setup script which need to be sourced by user's shell. For convenience this can be included into a user's login script (.bashrc/.cshrc). The exact name of the script depends on the shell flavor and also on the type of the environment. For the data-management environment one needs to use:

...

The script needs to be executed again if a user wants to switch to a different release or to use different build option (debug vs optimized builds).

Obtaining Kerberos ticket

If you plan to work with code repository and use commands like svn, addpkg, etc. then for authorization you will need to obtain a Kerberos ticket. Ticket can be obtained at any time after you logged in by running command kinit which will prompt your for your regular password. Kerberos ticket is valid for 25 hours after which time one needs to re-run the command. Without ticket svn will print an error message "authorization failed" when it tries to access repository (some svn commands do not require repository access).