Scale on EGI

EGI is a grid infrastructure gathering computing resources from all over the world. It is a very powerful computing environment, but is transpires as technically challenging to use. OpenMOLE makes it very simple to benefit from the grid.

Setup your grid credentials

You first need to set your EGI certificate. The way to achieve this is describe in the GUI guide")

Note: The following instructions explain how to setup the EGI authentication in console mode (not recommended). To delegate a task to EGI you need to register your certificate in OpenMOLE. In the console execute:
EGIAuthentication() = P12Certificate(encrypted, "/path/to/your/certificate.p12")

You need to execute this operation only once and for all. OpenMOLE persists this information in your preferences folder.

Submitting job to EGI

To use EGI through DIRAC you should setup an EGIAuthentication as explained above using a P12 certificate bundle. Other methods are not supported by DIRAC. In order to use EGI you must be registered in a Virtual Organisation (VO). The VO is the only compulsory parameter when creating an EGI environment:

val env = EGIEnvironment("biomed")

Here the VO biomed is specified, but you can specify the EGI VO of you choice.

Options available for DIRAC are:
  • cpuTime: the maximum duration for the job in terms of CPU consumption, for instance 1 hour,
  • openMOLEMemory: the memory of attributed to the OpenMOLE runtime on the execution node, if you run external tasks you can reduce the memory for the OpenMOLE runtime to 256MB in order to have more memory for you program on the execution node, for instance openMOLEMemory = 256 megabytes,
  • service: a DIRAC REST API,
  • group: the name of the DIRAC group,
  • bdii: the BDII to use for listing resources accessible from this VO. The BDII in your preference file is used, when this field is left unspecified.
  • vomsURL: the URL of the VOMS server used for the authentication,
  • fqan: additional flags for authentication,
  • setup: setup to use on the DIRAC server. It is set to "Dirac-Production" by default,
  • name: the name an environment will take in the logs.

The EGIEnvironment can be tuned using the previous options as in this example:
val env =
    cpuTime = 4 hours,
    openMOLEMemory = 200 megabytes