On 17/02/2009, at 3:56 PM, Jeff Douglas wrote:
Hello All,
The kind people at #haskell suggested I come to haskell-cafe for
questions about haskell performance issues.
I'm new to haskell, and I'm having a hard time understanding how to
deal with memory leaks.
I've been playing with some network server examples and I noticed with
each new connection, the memory footprint increases by about 7k
However, the leaks don't seem to have anything to do with the
networking code. Actually I get a huge leak just from using using
'forever'.
import Control.Monad
import System.IO
main = forever $ putStrLn "hi"
When I run it for a few seconds with profiling...
total time = 0.36 secs (18 ticks @ 20 ms)
total alloc = 54,423,396 bytes (excludes profiling overheads)
Can this be right?
I don't think there should be a space leak in the code you posted.
On my mac, OS X 10.5.6, GHC version 6.8.3, it appears to run in
constant space with or without optimisation.
GHCi seems to gobble a little bit of memory (but that could be
incidental).
My terminal application does gobble memory for a while (and then frees
it), but that is presumably because it is hammering the buffer (and it
nearly sets my lap on fire when running).
Perhaps you could post more details about how it is compiled, and what
versions of things are being used.
How are you detecting the leak (via top?).
Cheers,
Bernie.
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