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IST-033576 D2.1.4

Unfortunately BLCR has not yet been integrated with many batch systems.

Support for serial jobs is available through SGE. See this report for more in-

formation.

As with MPI implementations, efforts are under way to integrate BLCR with

additional batch systems, so check your batch system’s documentation for the

latest info.

The rest of this document assumes that your batch scheduler does not have

built-in support for BLCR. In this case you will manually run the BLCR com-

mands needed to checkpoint/restart your jobs.

Note: this does not mean that you cannot checkpoint/restart your applications

if you use a batch system without built-in support for BLCR. It simply means that

you have to do your checkpoints/restarts manually as described in the remainder

of this document. To the batch system, a job that is checkpointed and terminated

manually simply looks like a job that has "completed". A restart of an application

looks like a "new" job.

B.3 Checkpointing Jobs with the BLCR command-line tools

B.3.1 Make sure BLCR is installed and loaded

This guide assumes that BLCR has already been successfully built, installed, and

conﬁgured on your system (presumably by you or your system administrator).

One easy way to test this is to use the lsmod command to see if the BLCR kernel

module is loaded on the node(s) that your program will run on:

% / s b i n / lsmod

Module S i z e Used by Not t a i n t e d

b l c r 47508 0

blcr_vmadump 24744 1 b l c r

b l c r _ i m p o r t s 7808 2 b l c r , blcr_vmadump

i p t a b l e _ f i l t e r 2412 0 ( a u t o c l e a n ) ( un us ed )

i p _ t a b l e s 15864 1 [ i p t a b l e _ f i l t e r ]

If you don’t see the three modules that begin with ’blcr’ in the output of lsmod,

than BLCR is not yet running on your system. Consult the BLCR Administrators

Guide for instructions on building and installing BLCR.

B.3.2 Make sure your environment is set up correctly

You must ensure that the BLCR commands, libraries and manual pages can be

found in your shell.

Try running

XtreemOS–Integrated Project 40/49

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