[Haskell-cafe] Spurious memory leak example from the wiki

[Christopher Allen]

Here's the profiling report:

  11,371,237,400 bytes allocated in the heap
   6,880,974,648 bytes copied during GC
      17,531,336 bytes maximum residency (848 sample(s))
       4,580,080 bytes maximum slop
              51 MB total memory in use (5 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max
pause
  Gen  0     18716 colls,     0 par    0.140s   0.137s     0.0000s
 0.0003s
  Gen  1       848 colls,     0 par    4.324s   4.219s     0.0050s
 0.0095s

  TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1)

  SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled)

  INIT    time    0.000s  (  0.001s elapsed)
  MUT     time    1.680s  (  1.884s elapsed)
  GC      time    4.464s  (  4.356s elapsed)
  RP      time    0.000s  (  0.000s elapsed)
  PROF    time    0.000s  (  0.000s elapsed)
  EXIT    time    0.004s  (  0.000s elapsed)
  Total   time    6.280s  (  6.241s elapsed)

  Alloc rate    6,768,593,690 bytes per MUT second

  Productivity  28.9% of total user, 29.1% of total elapsed

gc_alloc_block_sync: 0
whitehole_spin: 0
gen[0].sync: 0
gen[1].sync: 0
6.30user 0.10system 0:06.44elapsed 99%CPU (0avgtext+0avgdata
109020maxresident)k
0inputs+24outputs (0major+41639minor)pagefaults 0swaps

I've attached a postscript of the heap profile, but that's from running it
just now and it's dying on segfault before finishing execution now
for...some reason. The above profiling report is from when I originally ran
it.

>From the segfault:

56109148054202365158913895741900770318778Command terminated by signal 11
6.79user 0.08system 0:06.96elapsed 98%CPU (0avgtext+0avgdata
125036maxresident)k
384inputs+120outputs (9major+44372minor)pagefaults 0swaps
Makefile:2: recipe for target 'profile' failed
make: *** [profile] Error 139

The numbers are from it trying to finish printing the result.

On Mon, Jan 4, 2016 at 2:21 PM, Joachim Breitner <mail at joachim-breitner.de>
wrote:

> Hi,
>
> Am Montag, den 04.01.2016, 08:26 -0600 schrieb Christopher Allen:
> > I can't get the two examples (sum/product) in:
> >
> > https://wiki.haskell.org/Memory_leak#Holding_a_reference_for_a_too_lo
> > ng_time
> >
> > to behave differently under O2 or O0.
> >
> > Same profile report each time.
>
> do you observe the leaking or the non-leaking behavior?
>
> Gruß,
> Joachim
>
> --
> Joachim “nomeata” Breitner
>   mail at joachim-breitner.de • http://www.joachim-breitner.de/
>   Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
>   Debian Developer: nomeata at debian.org
>
>
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-- 
Chris Allen
Currently working on http://haskellbook.com
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