[GHC] #3048: Heap size suggestion gets ignored when -G1 flag is passed

[GHC]

#3048: Heap size suggestion gets ignored when -G1 flag is passed
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Reporter:  tim               |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Runtime System  
 Version:  6.10.1            |       Severity:  minor           
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 Try running any program with {{{-G1}}} and a large {{{-H}}} option -- for
 example, cichelli from the nofib suite:
 {{{
 $ ./cichelli  +RTS -s -H32M -G1
 [output snipped]
 41,211,752 bytes allocated in the heap
       19,329,984 bytes copied during GC
        1,760,916 bytes maximum residency (34 sample(s))
           36,724 bytes maximum slop
                7 MB total memory in use (0 MB lost due to fragmentation)
 }}}

 Here, the suggestion of 32M seems to have been ignored, as the heap is at
 most 7M during execution. Whereas without {{{-G1}}}:
 {{{
 ./cichelli  +RTS -s -H32M
 [output snipped]
 41,212,300 bytes allocated in the heap
        1,121,304 bytes copied during GC
           49,484 bytes maximum residency (1 sample(s))
           36,824 bytes maximum slop
               31 MB total memory in use (0 MB lost due to fragmentation)
 }}}

 Here, the size suggestion is used and a 32M heap is allocated.

 Shouldn't the GC use the heap size suggestion even when there is only one
 generation?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3048>
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