Compilation tips

How can I speed up the SOLPS-ITER build?

Note: This experimental feature currently exists only in the feature/parallel_build fork.

Use a top-level -j flag to run compilation in parallel across all submodules:

make -j $(nproc) solps
make -j 16 solps_openmp

This lets GNU make's jobserver share compile jobs across B2.5, Eirene, Carre, Uinp, etc. simultaneously. Typical speed-up on 32 cores: ~40% wall-clock reduction compared to the older MAKE_OPTIONS=-j8 approach.

Note: The older form make MAKE_OPTIONS=-j8 is still supported but only parallelises within each submodule — it does not share jobs across modules.

Running in debug mode

b2run -d b2mn means you want to run b2mn inside the debugger (defined by your DBX environment variable). While set_debug ; b2run b2mn will just run the b2mn executable compiled with the debug options, and built from gmake solps_debug.