gpuOwL

GPU Lucas-Lehmer primality test.

Build

Use make or build.sh.

Prerequisites:

• a C++ compiler (e.g. gcc, clang)
• an OpenCL implementation (which provides the libOpenCL library), e.g. AMDGPU-Pro

The build is just a C++ compiler invocation on gpuowl.cpp, specifying the OpenCL library in the -L to the compiler, e.g.:

g++ gpuowl.cpp -ogpuowl -L/opt/amdgpu-pro/lib/x86_64-linux-gnu -lOpenCL

Usage

• Get exponents for testing from GIPMS Manual Testing ( http://mersenne.org/ ). gpuOwL best handles exponents is the vicinity of 77M, less than 78M.
• Copy the lines from GIMPS to a file named 'worktodo.txt'
• Run gpuowl. It prints progress report on stdout and in gpuowl.log, and writes result lines to results.txt
• Submit the result lines from results.txt to http://mersenne.org/ manual testing.

Command line arguments

• It is possible to pass arguments to the OpenCL compiler by passing "-cl" to gpuowl. For example, to dump the compiled ISA use gpuowl -cl -save-temps ; to put the ISA into an existing folder 'isa' use gpuowl -cl -save-temps=isa/