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All the Perl that's Practical to Extract and Report

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  • How does the cache behave if you add new multi subs at runtime? Does it wipe and start over, or does it figure out which entries to clear? Similarly, if the ISA chain of any class changes at runtime, do all of the multi caches get wiped? Or do you look at the isa tree before changing it to just clear part of the cache?

    Caveat: I have not looked at the code at all yet...

    • I haven't handled the case where you add new multis at runtime yet), but yes, it'll just clear the cache for that bunch of multis. It's easy enough to do (few lines of code); it's on my task list and will be done before we merge the branch in. We don't support changing the isa chain of a class at runtime yet in Rakudo, but I expect once we do then it will just wipe all MMD caches.

      We may be able to do something smarter in the future. But for Rakudo 1.0, I'm not really interested in making doing things like c

  • Does this have anything to do with ticket #60692? I just repeated a run of examples/benchmarks/primes2.pir with current parrot and what used to run in 8 seconds before commit 31668, took 220 after that and now takes 133 seconds. What's so unusual evil about this program?

    • Yes, it has something to do with it. I knew we'd need an MMD cache at some point, though I didn't plan it for further down the line. A bunch of changes done in that commit (actually a branch merge) resulted in opcode dispatch in many cases going through the standard multi-dispatcher, where before they just were done with a 2D lookup table (which gets unsustainable when you get lots of types). The changes means that at least multi subs and ops dispatch the same way, which is good, but there were some issues.