> first of all, let me thank you for writing and maintaining this
> excellent compiler! I am using it a lot recently and I couldn't be
> more happy with it. Thanks! :-)
>
> I wouldn't be posting here, though, if hadn't had a questions ... So
> here I go:
>
> (1) Using the DtdToHaskell tool, I converted the XML Docbook DTD to
> Haskell code. The resulting parser is amazing: It is almost 4
> megabyte large, 72800 lines of code. Now I tried to compile this
> beast and ran fresh out of memory.
>
> I fiddled with the RTS options to no avail. At some point GHC was
> consuming more than 800 megabytes of RAM, what resulted in
> serious thrashing (my machine has only 512 MB) and eventually the
> process was terminated.
>
> Does anyone have by any ideas how I could tackle this problem?
> Can I reduce GHC's memory requirements somehow? Can I split the
> module up and compile it in parts? In different phases? Anything?
> (If nothing comes up, I guess buying some more RAM is the
> answer.)
You can try fiddling with GHC's GC settings to reduce memory
consumption. The section of the User's Guide on runtime flags has some
hints; I would try -c first (turn on the compacting collector). Adding
more generations (eg. -G3) might help, and setting a maximum heap size
(eg. -M512m) will cause GHC to try to trim down its memory use when it
gets close to this boundary. Remember to surround any RTS options with
+RTS ... -RTS.
> (2) According to the documentation, GHC allows for setting the
> literate pre-processor to be used when compiling an .lhs file.
> This is supposed to occur with the '-pgmL' option, but no matter
> what I try, GHC always tells me:
>
> | ghc-5.04.2: unrecognised flags: -pgmL
> | Usage: For basic information, try the `--help' option.
>
> Am I doing something wrong or is the documentation out of synch
> with the implementation?
Hmm, good point. This option is missing from the implementation, thanks
for pointing it out.
Cheers,
Simon
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