Heap Profiling Question

[Rich Fought]

Simon Marlow wrote:
>
> That's right - the general idea is to make the profile insensitive to 
> other loading on the machine.  I can see there might be an argument 
> for making this tweakable, though.
>
This would be nice to have if one is trying to correlate behavior with 
specific I/O events in time (i.e. messages coming into a server).

>>    Alloc    Collect    Live    GC    GC     TOT     TOT  Page Flts
>>    bytes     bytes     bytes  user  elap    user    elap
>>   264424    262144     20592  0.00  0.00    0.03    0.01    0    0  
>> (Gen:  1)
>>   311540    270336     63732  0.00  0.00    3.84    5.25    0    0  
>> (Gen:  0)
>
> So between these first two GCs, your program spent nearly 4 seconds 
> doing something, but only allocated 300k.  What was it doing?
If I'm not mistaken, it's negotiating a TLS session.

I think I tracked down the bizarre timetag issue, it is already in Trac:

http://hackage.haskell.org/trac/ghc/ticket/769

So the out of order timetag of 3.100 in my original e-mail should really 
be 4.0.

Rich