#15418: Performance drop 60 times on non-profiling binary -------------------------------------+------------------------------------- Reporter: hth313 | Owner: (none) Type: bug | Status: infoneeded Priority: high | Milestone: 8.8.1 Component: Runtime System | Version: 8.4.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 Type of failure: Runtime | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #14414, #9599 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hth313): Here are the numbers for different optimization level (no profiling enabled). == `-O0` {{{ 15,092,192,977,712 bytes allocated in the heap 108,592,404,512 bytes copied during GC 186,703,440 bytes maximum residency (1432 sample(s)) 709,040 bytes maximum slop 451 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 13967958 colls, 0 par 301.484s 311.887s 0.0000s 0.0044s Gen 1 1432 colls, 0 par 100.350s 100.731s 0.0703s 0.2282s INIT time 0.000s ( 0.002s elapsed) MUT time 2260.896s (2283.741s elapsed) GC time 401.834s (412.618s elapsed) EXIT time 0.000s ( 0.002s elapsed) Total time 2662.730s (2696.363s elapsed) %GC time 15.1% (15.3% elapsed) Alloc rate 6,675,314,555 bytes per MUT second Productivity 84.9% of total user, 84.7% of total elapsed real 44m56.321s user 44m22.736s sys 0m31.989s }}} == `-O1` {{{ 2,608,631,901,600 bytes allocated in the heap 6,337,722,720 bytes copied during GC 80,513,992 bytes maximum residency (61 sample(s)) 434,080 bytes maximum slop 235 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 1993189 colls, 0 par 43.959s 45.610s 0.0000s 0.0021s Gen 1 61 colls, 0 par 2.810s 2.938s 0.0482s 0.1433s INIT time 0.000s ( 0.002s elapsed) MUT time 835.425s (843.204s elapsed) GC time 46.769s ( 48.548s elapsed) EXIT time 0.000s ( 0.001s elapsed) Total time 882.194s (891.755s elapsed) %GC time 5.3% (5.4% elapsed) Alloc rate 3,122,521,195 bytes per MUT second Productivity 94.7% of total user, 94.6% of total elapsed real 14m51.787s user 14m42.200s sys 0m7.372s }}} == `-O2` {{{ 2,608,768,497,856 bytes allocated in the heap 6,313,467,672 bytes copied during GC 80,449,120 bytes maximum residency (62 sample(s)) 487,840 bytes maximum slop 235 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 1993104 colls, 0 par 47.643s 49.406s 0.0000s 0.0017s Gen 1 62 colls, 0 par 2.746s 2.880s 0.0465s 0.1499s INIT time 0.000s ( 0.002s elapsed) MUT time 801.664s (809.891s elapsed) GC time 50.389s ( 52.286s elapsed) EXIT time 0.000s ( 0.009s elapsed) Total time 852.053s (862.189s elapsed) %GC time 5.9% (6.1% elapsed) Alloc rate 3,254,192,077 bytes per MUT second Productivity 94.1% of total user, 93.9% of total elapsed real 14m22.223s user 14m12.060s sys 0m7.559s }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15418#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler