How to use parallel computing/multithreading on ISIS4

[pruthviacharya]

I have ISIS 4.3.1 installed on a Linux machine with 10 cores and 20 threads; however, when I am running cam2map and it is taking forever. According to System Monitor on my system, only one CPU core is getting used at a time.

Is there an option that I can use to enable multithreading or use parallel computing to speed up the process.

[jlaura]

@pruthviacharya cam2map is (unfortunately) neither threaded nor capable of parallel processing. The classic technique to apply is to use an application like GNU Parallel to run many concurrent cam2map calls on different input observations at once.

Depending on your use case, you might consider using the ASP mapproject application that tiles the data and can be run using multiple processes.

[pruthviacharya]

I just need to do a polar projection for a MARCI image. I will check out mapproject.

Thanks!

[thareUSGS]

You might also want to check out this script (the bash *.sh file) which shows how one can use GNU Parallel. This codes happens to be using MARCI also. Looks like it is only issuing 2-6 parallel calls but that can be as many as you want. In your case you might want to limit it to ~10.
https://github.com/AsterAphelion/marci-parallel/tree/main