On 10/9/06, Jason Dagit <[EMAIL PROTECTED]> wrote:
Hello,
I have a program and I'd like to permanently change the default RTS
options. According to the GHC manual I can do that by linking with a
snippet of C code:
http://www.haskell.org/ghc/docs/latest/html/users_guide/runtime-control.html
Look at section 4.14.5 at the bottom of the page.
I can't seem to get cabal to link my program together so that my
custom rts options take affect. To help demonstrate I've created a
minimal test case:
------------- oom.cabal -------------------
name: OutOfMemory
version: 0.1
cabal-version: -any
license: AllRightsReserved
license-file: ""
build-depends: base -any
c-sources: rtsoptions.c
exposed-modules: Main
Executable: oom
Main-is: Main.hs
------------- end oom.cabal -----------
--------------- Main.hs ---------------------
module Main where
main :: IO ()
main = print $ foldl (+) 0 [1..100000000]
--------------- End Main.hs --------------
/* rtsoptions.c */
char *ghc_rts_opts = "-M1024M -K256M";
/* end rtsoptions.c */
Also using the standard Setup.lhs:
#! /usr/bin/runghc
\begin{code}
import Distribution.Simple
main = defaultMain
\end{code}
When build and run this I get:
C:\projects\tmp>runghc Setup.lhs build
Preprocessing library OutOfMemory-0.1...
Preprocessing executables for OutOfMemory-0.1...
Building OutOfMemory-0.1...
[1 of 1] Compiling Main ( Main.hs, dist\build\oom\oom-tmp/Main.o )
Linking dist\build\oom\oom.exe ...
C:\projects\tmp>dist\build\oom\oom.exe
Heap exhausted;
Current maximum heap size is 268435456 bytes (256 Mb);
use `+RTS -M<size>' to increase it.
On the other hand, if I build rtsoptions.c manually and add it to the
ghc-options line in the .cabal file it does build and run until in
needs more than 976Mb (showing that the default RTS options are indeed
different).
Add the C source to the executable instead of the library. In other
words, move the 'c-sources' under 'main-is'.
--
Cheers,
Lemmih
_______________________________________________
cabal-devel mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/cabal-devel
