#2002: problems with very large (list) literals
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Reporter: Isaac Dupree | Owner: simonmar
Type: compile-time performance bug | Status: new
Priority: high | Milestone: 6.10 branch
Component: Compiler | Version: 6.8.2
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Linux |
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Comment (by Isaac Dupree):
update: with my 2 GB RAM and 3 GB swap space, gcc took a long time
swapping, but got in a good 2 minutes of CPU time according to `top` (cc1
achieving about 80% of my RAM used at any one time, and between 0 and 50
percent of my 2GHz CPU) before dying due to lack of virtual memory.
Therefore, it seems that while there is a moderate performance issue with
GHC through STG (2 minutes for a single file?), the assembly is the really
difficult part: GCC needs an obscene amount of memory, and GHC's -fasm
either needs an obscene or infinite amount of time. But let me check back
again... that might have been the optimizations and my cutting corners...
{{{
Makefile:1004: LIBRARY is libHSghc.a
../compiler/stage1/ghc-inplace -no-user-package-conf -H128m -O0 -fvia-C
-istage2/utils -istage2/basicTypes -istage2/types -istage2/hsSyn
-istage2/prelude -istage2/rename -istage2/typecheck -istage2/deSugar
-istage2/coreSyn -istage2/vectorise -istage2/specialise
-istage2/simplCore -istage2/stranal -istage2/stgSyn -istage2/simplStg
-istage2/codeGen -istage2/main -istage2/profiling -istage2/parser
-istage2/cprAnalysis -istage2/iface -istage2/cmm -istage2/nativeGen
-istage2/ghci -Wall -fno-warn-name-shadowing -fno-warn-orphans -Istage2
-package hpc -package bytestring -DGHCI -package template-haskell
-DGHCI_TABLES_NEXT_TO_CODE -I../libffi/build/include -cpp -fglasgow-exts
-fno-generics -Rghc-timing -I. -Iparser -Iutil -package unix -package
Cabal -ignore-package lang -recomp -Rghc-timing -O0 -fvia-C -DDEBUG -H16M
'-#include "cutils.h"' -package-name ghc-6.9.20080602 -fgenerics
-funbox-strict-fields -c parser/Lexer.hs -o stage2/parser/Lexer.o -ohi
stage2/parser/Lexer.hi
Binary: expanding to size: 6144
Binary: expanding to size: 6144
Binary: expanding to size: 6144
Binary: expanding to size: 6144
virtual memory exhausted: Cannot allocate memory
<<ghc: 25106288876 bytes, 47369 GCs, 25428014/262348800 avg/max bytes
residency (89 samples), 612M in use, 0.00 INIT (0.00 elapsed), 61.75 MUT
(1451.24 elapsed), 68.52 GC (69.86 elapsed) :ghc>>
make: *** [stage2/parser/Lexer.o] Error 1
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2002#comment:11>
GHC <http://www.haskell.org/ghc/>
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