CPU: Run r.cost and r.path in parallel

benducke commented 3 years ago

Function model_complete():

It should be straight-forward to run r.cost and r.path in parallel (note that the m:n link packages differ in size for each run through the loop, so the thread run times will decrease linearly):

v.patch has an -a(ppend) flag: in theory, one could just start as many threads as there are m:n linking groups, create a temporary map for each result with a global ID suffix, then patch them all together, one after another. In that case, the only limit we face would be the number of processes that the OS allows (for Linux: "ulimit -u"; or "prlimit" (NPROC); use "sudo prlimit" to increase maximum number of processes)

benducke commented 3 years ago

Enable option "threads=" (default: 2) for specifying the number of concurrent operations.

benducke commented 1 year ago

Initial support implemented (so far tested only on Linux): v.net.models

benducke commented 1 month ago

Windows platform is missing a 'sleep' command for thread synchronisation. Win32 has "timeout": https://serverfault.com/questions/432322/how-to-sleep-in-a-batch-file

For the moment, multi-threading is disabled if $SLEEP is not set (see function 'check_setup').

benducke / Network-reconstruction-tools-for-GRASS-GIS

CPU: Run r.cost and r.path in parallel #4