Your message dated Wed, 12 Dec 2012 17:03:48 +0000 with message-id <[email protected]> and subject line Bug#677096: fixed in ghc 7.6.1.20121207-1 has caused the Debian Bug report #677096, regarding thread-using code built with current ghc's non-threaded runtime spins to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 677096: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=677096 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: ghc Version: 7.4.1-3 Severity: normal Stracing xmonad, I see a rather tight loop like this: --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) poll([{fd=3, events=POLLIN}], 1, -1) = ? ERESTART_RESTARTBLOCK (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) poll([{fd=3, events=POLLIN}], 1, -1) = ? ERESTART_RESTARTBLOCK (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) poll([{fd=3, events=POLLIN}], 1, -1) = ? ERESTART_RESTARTBLOCK (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) poll([{fd=3, events=POLLIN}], 1, -1) = ? ERESTART_RESTARTBLOCK (To be restarted) This is probably bad for a daemon or long-running program, especially on a laptop. It will probably keep the CPU from entering wait states. Powertop seems to bear this out; when xmonad is running my laptop enters the C1 idle state less than 10% of the time; when I kill -STOP xmonad, this jumps to 20% or more. Also, xmonad is at the top of powertop's list of offenders: Usage Events/s Category Description 11.0 ms/s 46.7 Process /home/joey/.xmonad/xmonad I can reproduce a similar tight loop in strace with this simple program, when built with ghc 7.4, without the threaded runtime: import Control.Monad import Control.Concurrent fooThread = forever $ threadDelay 100000000 -- 100 seconds main = do forkIO fooThread fooThread The strace is much the same as the xmonad one, only the condition the threads are waiting on varies, but the constant waking up remains the same. gettimeofday({1339429713, 896353}, NULL) = 0 select(0, [], [], NULL, {99, 540844}) = ? ERESTARTNOHAND (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) gettimeofday({1339429713, 906388}, NULL) = 0 select(0, [], [], NULL, {99, 532563}) = ? ERESTARTNOHAND (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) gettimeofday({1339429713, 917327}, NULL) = 0 select(0, [], [], NULL, {99, 524158}) = ? ERESTARTNOHAND (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) gettimeofday({1339429713, 926545}, NULL) = 0 select(0, [], [], NULL, {99, 516729}) = ? ERESTARTNOHAND (To be restarted) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- With the threaded runtime, this doesn't happen. And, if I build it with ghc 6.12, nonthreaded runtime, the strace looks like this: gettimeofday({1339429071, 169771}, NULL) = 0 gettimeofday({1339429071, 169926}, NULL) = 0 select(0, [], [], NULL, {100, 20000} If we're going to ship this GHC, then this bug should at least be cloned to xmonad and it made to build with -threaded. That seems to work well for me. -- System Information: Debian Release: wheezy/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: i386 (i686) Kernel: Linux 3.2.0-2-686-pae (SMP w/2 CPU cores) Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages ghc depends on: ii gcc 4:4.7.0-6 ii libbsd-dev 0.3.0-2 ii libc6 2.13-32 ii libc6-dev 2.13-32 ii libffi-dev 3.0.10-3 ii libffi5 3.0.10-3 ii libgmp-dev 2:5.0.5+dfsg-1.1 ii libgmp10 2:5.0.5+dfsg-1.1 ii libncurses5 5.9-7 ii libtinfo5 5.9-7 ghc recommends no packages. Versions of packages ghc suggests: ii ghc-doc 7.4.1-3 ii ghc-prof 7.4.1-3 ii haskell-doc <none> ii llvm-3.0 <none> ii perl 5.14.2-10 -- no debconf information -- see shy jo
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--- Begin Message ---Source: ghc Source-Version: 7.6.1.20121207-1 We believe that the bug you reported is fixed in the latest version of ghc, which is due to be installed in the Debian FTP archive. A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to [email protected], and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. Joachim Breitner <[email protected]> (supplier of updated ghc package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing [email protected]) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Format: 1.8 Date: Wed, 12 Dec 2012 12:32:48 +0100 Source: ghc Binary: ghc ghc-prof ghc-doc ghc-dynamic ghc-haddock ghc6 ghc6-doc ghc6-prof Architecture: source all amd64 Version: 7.6.1.20121207-1 Distribution: experimental Urgency: low Maintainer: Debian Haskell Group <[email protected]> Changed-By: Joachim Breitner <[email protected]> Description: ghc - The Glasgow Haskell Compilation system ghc-doc - Documentation for the Glasgow Haskell Compilation system ghc-dynamic - Dynamic libraries for the Glasgow Haskell Compilation system ghc-haddock - Documentation tool for annotated Haskell source code ghc-prof - Profiling libraries for the Glasgow Haskell Compilation system ghc6 - transitional dummy package ghc6-doc - transitional dummy package ghc6-prof - transitional dummy package Closes: 677096 695739 Changes: ghc (7.6.1.20121207-1) experimental; urgency=low . * New upstream release (aka 7.6.1-rc). + Closes: #677096 (huge number of wakeups) * Remove debian/patches/armhf_llvm_abi, applied upstream, thanks to Shawn Landden for noticing (Closes: #695739) * Hardcode in debian/rules that haddock supportin interface version 22 also supports interface version 21. 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