9 Jun
2005
9 Jun
'05
10:49 a.m.
On 09 June 2005 11:47, Serge D. Mechveliani wrote:
On memory expense -----------------
A difference of 2.5Mb is really very small. If you could show that the space usage is linear in one case and flat in another, then we have a problem.
But a ratio 2600 K / 200 K for n = 55000 is not so small.
I never tested this, but what if in this mergeSort-like example the space sizes are space.6.4(n) = 13*space.5.02(n)
(which has the above ratio for n = 55000) ?
If you can demonstrate that GHC 6.4 uses 13 times more space than 5.02 on your example, then that's a performance bug - but all you showed so far is that 6.4 uses 2.5Mb more space. i.e. you need to do a few more measurements for different values of n. Cheers, Simon