RE: Slow compile times

On Fri, May 02, 2003 at 02:56:45AM +0200, Peter Simons wrote:

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Kirsten Chevalier writes:

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I'm running GHC with the following options: -fallow-overlapping-instances -cpp -O1 -fvia-C -fglasgow-exts -package text -dcore-lint -prof -auto-all +RTS -K48M -M1024M -RTS -fno-strictness -Rghc-timing

Did you try setting a bigger "suggested heap size" for GHC with the run-time-system option "-H"? I found that setting something like "-H128M" affected compile times positively on my machine.

I hope this helps ...

I tried compiling the same file with -H512M -M512M instead of -M1024M, keeping all other options the same. I got the following results:

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With -O0, I get:

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This is better than before, but it still seems pretty slow; any other suggestions?

The main thing to reduce GC time is to use -H<size>, as suggested. We do have some compilation speed "issues" with large source files, which I hope we'll get around to investigating at some point. You're using -prof, which precludes use of the native code generator. If you can do without -prof, then -fasm should improve compilation times a lot without affecting performance of the compiled program too much. Cheers, Simon