Am Dienstag 15 September 2009 21:13:02 schrieb Daniel Fischer:
Still, the body should be read lazily. I'm not sure, but the tracing message may be output because of its position.
With
where readBody = withFile fn ReadMode $ \h -> do b <- hGetContents h seq b $ return (trace ("Read body from: " ++ fn) b)
there's no tracing output.
Yes, tested with -rw-r--r-- 1 me users 243M 15. Sep 21:17 file1.txt -rw-r--r-- 1 me users 243M 15. Sep 21:18 file2.txt original: ./cparis2 +RTS -Sstderr Alloc Copied Live GC GC TOT TOT Page Flts bytes bytes bytes user elap user elap Read body: file1.txt Read body: file2.txt 2 3 427996 1408 18620 0.00 0.00 0.00 0.00 0 0 (Gen: 1) 4096 0.00 0.00 432,092 bytes allocated in the heap 1,408 bytes copied during GC 18,620 bytes maximum residency (1 sample(s)) 22,340 bytes maximum slop 1 MB total memory in use (0 MB lost due to fragmentation) Generation 0: 0 collections, 0 parallel, 0.00s, 0.00s elapsed Generation 1: 1 collections, 0 parallel, 0.00s, 0.00s elapsed INIT time 0.00s ( 0.00s elapsed) MUT time 0.00s ( 0.00s elapsed) GC time 0.00s ( 0.00s elapsed) EXIT time 0.00s ( 0.00s elapsed) Total time 0.00s ( 0.00s elapsed) %GC time 0.0% (8.3% elapsed) Alloc rate 432,092,000,000 bytes per MUT second Productivity 100.0% of total user, 0.1% of total elapsed moved trace: ./CParis +RTS -Sstderr Alloc Copied Live GC GC TOT TOT Page Flts bytes bytes bytes user elap user elap 2 3 426100 1408 18476 0.00 0.00 0.00 0.00 0 0 (Gen: 1) 4096 0.00 0.00 430,196 bytes allocated in the heap 1,408 bytes copied during GC 18,476 bytes maximum residency (1 sample(s)) 22,484 bytes maximum slop 1 MB total memory in use (0 MB lost due to fragmentation) Generation 0: 0 collections, 0 parallel, 0.00s, 0.00s elapsed Generation 1: 1 collections, 0 parallel, 0.00s, 0.00s elapsed INIT time 0.00s ( 0.00s elapsed) MUT time 0.00s ( 0.00s elapsed) GC time 0.00s ( 0.00s elapsed) EXIT time 0.00s ( 0.00s elapsed) Total time 0.00s ( 0.00s elapsed) %GC time 0.0% (9.3% elapsed) Alloc rate 107,549,000 bytes per MUT second Productivity 100.0% of total user, 230.3% of total elapsed