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In this work we describe the implementation of a An Example Usage Scenario In order to illustrate how trace-driven debugging appears to a user, consider the following scenario. The user is experiencing problems with an MPI program that iteratively solves for the vector X in the matrix equation A * X = B. The program seems to hang indefinitely, with no warning messages or errors produced by MPI. The program breaks down into two main phases: a workload distribution phase where the rows of thedoi:10.1109/ccgrid.2001.923219 dblp:conf/ccgrid/HoodM01 fatcat:tqcdm7amgzcubmwevyhrh65cne