Memory analysis tool for finding gather / scatter (gs) accesses from DynamoRio traces. gs_patterns discovers gather/scatters from analyzing access patterns in memory traces (doesn't just look for gs instructions). gs_patterns writes the "subtraces" to a binary trace and spatter yaml format. The source lines of the top aggressors are reported. Use the provided pin clients in the pin_tracing folder or use DynamoRio. Pin tends to be more reliable for larger applications.
mkdir build
cd build
cmake ..
make
gs_pattern <trace.gz> <binary>
trace file should be gzipped. Binary file should be compiled with symbols turned on (-g)
g/s accesses are found by looking at repeated instruction addresses (loops) that are memory instructions (scalar and vector). The first pass finds the top g/s's. The second pass focuses on the top g/s accesses and records the normalized address distances to a binary file and spatter yaml.
BSD-3 License. See the LICENSE file.
Kevin Sheridan, kss@lanl.gov