Yes, you can use +RTS -hT, which is available even in the non-profiled runtime. This breaks down the heap by closure type. Of course, you don't have visibility into the source of the allocation, but this is often still quite useful.
— Ben
On May 23, 2020 8:58:30 AM EDT, Richard Eisenberg
Hi devs,
Is there a way to count the number of times a particular constructor is allocated? I might want to know, say, the total number of cons cells allocated over the course of a program, or (in my actual case) the total number of FunTy cells allocated over the course of a program.
I can try to do this with an SCC. But it's very clunky: * The constructor may be used in a number of places; each such place would need the SCC. * SCCs can interfere with optimizations. In my use case, this would negate the usefulness of the exercise entirely, as I think some of the structures I wish to observe should never come into being, due to optimizations (e.g. case-of-known-constructor after inlining).
Surely, the RTS must be able to count the number of times a constructor is used. But is there any way to access such a feature? If others agree that this would sometimes be helpful, perhaps we can build the feature. Now is not the first time I've wanted this.
Thanks! Richard _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
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