[commit: testsuite] master: Fix remaining test failures on OS X/x86_64 (bea1187)

[Manuel M T Chakravarty]

Ian Lynagh:
> On Fri, Aug 05, 2011 at 03:09:11PM +0100, Simon Marlow wrote:
>> 
>> I get almost identical results on my Linux box here.  Ok, so to
>> summarise the T4801 results:
>> 
>> peak MB:     Linux; 61
>>              OS X : 72
>> 
>> allocations: Linux: 72GB
>>              OS X:  81GB
>> 
>> those differences are large enough to be a concern, I think (>10%).
>> 
>> There are no differences in the RTS that would cause extra
>> allocation on OS X.  It seems to be just the compiler tests that
>> need more memory - so something in GHC maybe?
> 
> Here's T4801 run with -hT:
>    http://lambda.haskell.org/~igloo/linux.png
>    http://lambda.haskell.org/~igloo/mac.png
> 
> It looks like they're the same until the code gen stage, where we use
> more memory to generate MachO code than ELF code. Could be due to some
> missing strictness, as it looks like there is quite a bit of extra
> THUNK.
> 
> FWIW, here are the compiler stats:
> 
> Linux:
> [("bytes allocated", "723833288")
> ,("num_GCs", "1297")
> ,("average_bytes_used", "15074188")
> ,("max_bytes_used", "22636088")
> ,("num_byte_usage_samples", "1297")
> ,("peak_megabytes_allocated", "59")
> ,("init_cpu_seconds", "0.00")
> ,("init_wall_seconds", "0.00")
> ,("mutator_cpu_seconds", "0.91")
> ,("mutator_wall_seconds", "1.05")
> ,("GC_cpu_seconds", "75.07")
> ,("GC_wall_seconds", "75.07")
> ]

Is that correct?  1s mutator versus 75s GC?

> Mac:
> [("bytes allocated", "812618832")
> ,("num_GCs", "1466")
> ,("average_bytes_used", "16302266")
> ,("max_bytes_used", "27078816")
> ,("num_byte_usage_samples", "1466")
> ,("peak_megabytes_allocated", "69")
> ,("init_cpu_seconds", "0.00")
> ,("init_wall_seconds", "0.00")
> ,("mutator_cpu_seconds", "0.79")
> ,("mutator_wall_seconds", "1.06")
> ,("GC_cpu_seconds", "73.02")
> ,("GC_wall_seconds", "74.44")
> ]

Seems the version is a bit faster, though.  (Or is that on different hardware?)

Manuel