Greets :) On Mon 17 Sep 2018 11:35, l...@gnu.org (Ludovic Courtès) writes:
>> The threshold at which Guile will automatically JIT-compile is set from >> the GUILE_JIT_THRESHOLD environment variable. By default it is 50000. >> If you set it to -1, you disable the JIT. If you set it to 0, *all* >> code will be JIT-compiled. The test suite passes at >> GUILE_JIT_THRESHOLD=0, indicating that all features in Guile are >> supported by the JIT. Set the GUILE_JIT_LOG environment variable to 1 >> or 2 to see JIT progress. > > Just to be clear, does GUILE_JIT_THRESHOLD represents the number of > times a given instruction pointer is hit? No. It is an abstract "hotness" counter associated with a function's code. (I say "function's code" because many closures can share the same code and thus the same counter. It's not in the scm_tc7_program object because some procedures don't have these.) All counters start at 0 when Guile starts. A function's counters increment by 30 when a function is called, currently, and 2 on every loop back-edge. I have not attempted to tweak these values yet. >> Using GNU Lightning has been useful but in the long term I don't think >> it's the library that we need, for a few reasons: > > [...] > > It might be that the lightning 1.x branch would be a better fit (it was > exactly as you describe.) I think that’s what Racket was (is?) using. Could be! I will have a look. Cheers, Andy
