#3110: Setting the hard maximum heap size no longer works
------------------------------+---------------------------------------------
Reporter: dons | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Runtime System | Version: 6.10.1
Severity: normal | Resolution: invalid
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
------------------------------+---------------------------------------------
Changes (by dons):
* status: new => closed
* resolution: => invalid
Comment:
Looks like this might be the GC bug that's already fixed.
Another example:
{{{
main = do print (product s)
print (sum s)
where s = [1..]
}}}
With GHC 6.10.1
{{{
-bash-3.2$ ./A1 +RTS -sstderr -M4M
./A1 +RTS -sstderr -M4M
16,307,808 bytes allocated in the heap
3,982,800 bytes copied during GC
3,061,660 bytes maximum residency (3 sample(s))
214,100 bytes maximum slop
2932 MB total memory in use (1204 MB lost due to
fragmentation)
Generation 0: 29 collections, 0 parallel, 0.02s, 0.03s elapsed
Generation 1: 3 collections, 0 parallel, 0.02s, 3.06s elapsed
INIT time 0.00s ( 0.00s elapsed)
MUT time 10.27s ( 21.53s elapsed)
GC time 0.04s ( 3.09s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 10.31s ( 24.62s elapsed)
%GC time 0.4% (12.5% elapsed)
Alloc rate 1,587,907 bytes per MUT second
Productivity 99.6% of total user, 41.7% of total elapsed
}}}
It uses too much heap.
With 6.10.2 it is fixed:
{{{
-bash-3.2$ ./A1 +RTS -sstderr -M4M
./A1 +RTS -sstderr -M4M
Heap exhausted;
Current maximum heap size is 3997696 bytes (3 MB);
use `+RTS -M<size>' to increase it.
28,835,361,100 bytes allocated in the heap
8,082,024 bytes copied during GC
3,809,076 bytes maximum residency (5 sample(s))
385,760 bytes maximum slop
17 MB total memory in use (11 MB lost due to fragmentation)
Generation 0: 46743 collections, 0 parallel, 0.21s, 0.26s elapsed
Generation 1: 5 collections, 0 parallel, 0.03s, 0.04s elapsed
INIT time 0.00s ( 0.00s elapsed)
MUT time 14.01s ( 14.10s elapsed)
GC time 0.24s ( 0.31s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 14.25s ( 14.41s elapsed)
%GC time 1.7% (2.1% elapsed)
Alloc rate 2,058,198,508 bytes per MUT second
Productivity 98.3% of total user, 97.2% of total elapsed
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3110#comment:1>
GHC <http://www.haskell.org/ghc/>
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