LUB
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LUB is an LU matrix decomposition by blocks

Usage::

    ./LUB <size-matrix> <size-block>

**Goals of this exercise**

 * Run the instrumented version of LUB and analyse the Paraver trace.
 * Enable DLB options. Run and analyse the Paraver trace.
 * Run the multirun.sh script and compare the execution performance with and without DLB.