... | @@ -5,18 +5,22 @@ Ticky-ticky profiling adds counters to every STG function. It's very low-level, |
... | @@ -5,18 +5,22 @@ Ticky-ticky profiling adds counters to every STG function. It's very low-level, |
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- Add the `-ticky` flag when compiling a Haskell module to enable "ticky-ticky" profiling of that module. This makes GHC emit performance-counting instructions in every STG function.
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- Add the `-ticky` flag when compiling a Haskell module to enable "ticky-ticky" profiling of that module. This makes GHC emit performance-counting instructions in every STG function.
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- Add `-ticky` to the command line when linking, so that you link against a version of the runtime system that allows you to display the results.
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- Add `-debug` to the command line when linking, so that you link against a version of the runtime system that allows you to display the results. \[Adding `-ticky` should work too, but it doesn't yet; see [\#3439](https://gitlab.haskell.org//ghc/ghc/issues/3439).\]
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- Add `+RTS -rfoo.ticky` to the run-time command line, to put the ticky-ticky profile in the file `foo.ticky`.
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- Add `+RTS -rfoo.ticky` to the run-time command line, to put the ticky-ticky profile in the file `foo.ticky`.
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It's very low level stuff. You need to use `-ddump-simpl -ddump-prep` when compiling the source files to see the functions that correspond to the performance counter report.
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You need to use `-ddump-simpl -ddump-prep` when compiling the source files to see the functions that correspond to the performance counter report.
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You can mix modules compiled with `-ticky` and modules compiled without.
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It's very low level stuff, but in exchange:
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- It's guaranteed that adding `-ticky` doesn't affect optimisation or transformation. It just adds the overhead of performance counters to the final code.
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To really see everything you need to compile all the libraries with `-ticky`. To do that in a standard build tree, here are some flag settings in `build.mk` that work:
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- You can mix modules compiled with `-ticky` and modules compiled without.
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To *really* see everything you need to compile all the libraries with `-ticky`. To do that in a standard build tree, here are some flag settings in `build.mk` that work:
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```wiki
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```wiki
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# Build all libraries with -ticky
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# Build all libraries with -ticky
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... | @@ -27,13 +31,4 @@ GhcRTSWays += t |
... | @@ -27,13 +31,4 @@ GhcRTSWays += t |
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# Currently ticky is incompatible with threading
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# Currently ticky is incompatible with threading
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GhcThreaded = NO
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GhcThreaded = NO
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# When linking stage2 you need -ticky, else you get unresolved symols
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GhcStage2HcOpts += -ticky
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# Ditto Haddock
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utils/haddock_dist_EXTRA_HC_OPTS += -ticky
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``` |
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``` |
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\ No newline at end of file |
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But see [\#3439](https://gitlab.haskell.org//ghc/ghc/issues/3439), which would allow you to drop the last two. |
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