Andrea Rossato wrote:
I did not get an appreciable improvement with performGC, as you can see from here: http://gorgias.mine.nu/haskell/a.out.withPerformGC.ps
But I found a solution: just write the opml state component to a file!
Obviously the values in question were not garbage, rather these were unevaluated thunks. Writing the data causes it to be evaluated, the thunks become garbage and get collected. The correct solution however, is the application of 'seq' at the right places. To understand where these are, perform a simulation of Haskell's reduction strategy on paper.
second, each Char in ghc occupies 12 bytes (!)
multiplying this at 2.5 or even 3 factor which i described in previous letter means, say, 30 mb used
30 Mega used for reading a feed is a number that I seem to get.
Depends on what you're doing with the data. If you scan a stream of Chars exactly once, the space requirement per Char is next to irrelevant. If you're keeping lots of Strings around, using PackedStrings will help (and be sure to pack strictly). But I actually suspect, you are running a backtracking parser over your input, so the whole input is read into a String and cannot be disposed of as long as the parser might backtrack. If this is Parsec, you need to remove a redundant 'try'. If it is the Read class, you need to replace it by Parsec or ReadP... Udo. -- <Lorien> Ich glaub vorher defragmentier ich meine Festplatte, schmeiß alle CDs weg und installier Löwenzahn, Teletubbies, Pokemon usw. auf meinem Rechner. Dann lauf ich amok. Das wird den Psychologen EINIGES zu denken geben.