24 Sep
2006
24 Sep
'06
1:34 p.m.
On Sun, 2006-09-24 at 01:28 +0400, Bulat Ziganshin wrote:
Hello Duncan,
Sunday, September 24, 2006, 12:22:38 AM, you wrote:
after program prints "40 mb allocated" look at Task Manager indication - it shows that two times more memory actually in use. it seems that problem is only with allocating memory buffers whose sizes are powers of 2 or very close - bug shows for bufsize = 4kb, 1mb or 4095, but not not for 4000 or 10^6
The reason for this is that for larger objects ghc has an allocation granularity of 4k. That is it always uses a multiple of 4k bytes.
with 512k blocks it also allocates two times more data than requested.
Oh, sorry I missed that point. Something fishy is going on then. Duncan