24 Jun
2010
24 Jun
'10
2:30 p.m.
On 24 June 2010 13:10, Simon Marlow
On 17/06/2010 06:23, braver wrote:
I'll work with Simon to investigate the runtime, but would welcome any ideas on further speeding up cafe4.
An update on this: with the help of Alex I tracked down the problem (an integer overflow bug in GHC's memory allocator), and his program now runs to completion.
This is the largest program (in terms of memory requirements) I've ever seen anyone run using GHC. In fact there was no machine in our building capable of running it, I had to fire up the largest Amazon EC2 instance available (68GB) to debug it - this bug cost me $26.
I foresee Simon not having to pay for any of his beer at ICFP thus summer... Duncan