Bug#799857: apt: Low select timeout
On Wed, Sep 23, 2015 at 12:57:19PM +0200, Olaf van der Spek wrote:
> Subject: apt: Low select timeout
> Package: apt
> Version: 1.0.10.2
> Severity: wishlist
Thanks for your bugreport.
> Dear Maintainer,
>
> > pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> > waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
> > pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> > waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
>
> apt-get seems to use a timeout of 0.5ms for some select call.. Was
> this supposed to be 500ms?
> 0.5ms seems unrealistically low and results in unnecessary CPU usage.
> No big problem though. ;)
> This happened when hung on Installing new version of config file
> /etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf ...
This is fixed in git and will be part of the next upload.
Cheers,
Michael
> Greetings,
>
> Olaf
>
> -- Package-specific info:
>
> -- apt-config dump --
>
> APT "";
> APT::Architecture "i386";
> APT::Build-Essential "";
> APT::Build-Essential:: "build-essential";
> APT::Install-Recommends "1";
> APT::Install-Suggests "0";
> APT::Authentication "";
> APT::Authentication::TrustCDROM "true";
> APT::NeverAutoRemove "";
> APT::NeverAutoRemove:: "^firmware-linux.*";
> APT::NeverAutoRemove:: "^linux-firmware$";
> APT::NeverAutoRemove:: "^linux-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-2-686-pae$";
> APT::VersionedKernelPackages "";
> APT::VersionedKernelPackages:: "linux-image";
> APT::VersionedKernelPackages:: "linux-headers";
> APT::VersionedKernelPackages:: "linux-image-extra";
> APT::VersionedKernelPackages:: "linux-signed-image";
> APT::VersionedKernelPackages:: "kfreebsd-image";
> APT::VersionedKernelPackages:: "kfreebsd-headers";
> APT::VersionedKernelPackages:: "gnumach-image";
> APT::VersionedKernelPackages:: ".*-modules";
> APT::VersionedKernelPackages:: ".*-kernel";
> APT::VersionedKernelPackages:: "linux-backports-modules-.*";
> APT::VersionedKernelPackages:: "linux-tools";
> APT::Never-MarkAuto-Sections "";
> APT::Never-MarkAuto-Sections:: "metapackages";
> APT::Never-MarkAuto-Sections:: "restricted/metapackages";
> APT::Never-MarkAuto-Sections:: "universe/metapackages";
> APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
> APT::Never-MarkAuto-Sections:: "oldlibs";
> APT::Never-MarkAuto-Sections:: "restricted/oldlibs";
> APT::Never-MarkAuto-Sections:: "universe/oldlibs";
>
> [ Wrote 230 lines ]
>
> Report will be sent to "Debian Bug Tracking System" <submit@bugs.debian.org>
> Submit this report on apt (e to edit) [Y|n|a|c|e|i|l|m|p|q|d|t|s|?]?
> Bug report written as /var/tmp/apt.bug
>
> If you want to provide additional information, please wait to receive
> the bug tracking number via email; you may then send any extra
> information to n@bugs.debian.org (e.g.
> 999999@bugs.debian.org), where n is the bug number. Normally you will
> receive an acknowledgement via email including the bug report number
> within an hour; if you haven't received a confirmation,
> then the bug reporting process failed at some point (reportbug or MTA
> failure, BTS maintenance, etc.).
> olaf@unstable:~$ cat /var/tmp/apt.bug
> Content-Type: text/plain; charset="us-ascii"
> MIME-Version: 1.0
> Content-Transfer-Encoding: 7bit
> From: Olaf van der Spek <olaf@unstable>
> To: Debian Bug Tracking System <submit@bugs.debian.org>
> Subject: apt: Low select timeout
> Message-ID: <20150923105620.15397.70969.reportbug@unstable>
> X-Mailer: reportbug 6.6.5
> Date: Wed, 23 Sep 2015 12:56:20 +0200
>
> Package: apt
> Version: 1.0.10.2
> Severity: wishlist
>
> Dear Maintainer,
>
> > pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> > waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
> > pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> > waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
>
> apt-get seems to use a timeout of 0.5ms for some select call.. Was
> this supposed to be 500ms?
> 0.5ms seems unrealistically low and results in unnecessary CPU usage.
> No big problem though. ;)
> This happened when hung on Installing new version of config file
> /etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf ...
>
> Greetings,
>
> Olaf
>
> -- Package-specific info:
>
> -- apt-config dump --
>
> APT "";
> APT::Architecture "i386";
> APT::Build-Essential "";
> APT::Build-Essential:: "build-essential";
> APT::Install-Recommends "1";
> APT::Install-Suggests "0";
> APT::Authentication "";
> APT::Authentication::TrustCDROM "true";
> APT::NeverAutoRemove "";
> APT::NeverAutoRemove:: "^firmware-linux.*";
> APT::NeverAutoRemove:: "^linux-firmware$";
> APT::NeverAutoRemove:: "^linux-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-2-686-pae$";
> APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-1-686-pae$";
> APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-2-686-pae$";
> APT::VersionedKernelPackages "";
> APT::VersionedKernelPackages:: "linux-image";
> APT::VersionedKernelPackages:: "linux-headers";
> APT::VersionedKernelPackages:: "linux-image-extra";
> APT::VersionedKernelPackages:: "linux-signed-image";
> APT::VersionedKernelPackages:: "kfreebsd-image";
> APT::VersionedKernelPackages:: "kfreebsd-headers";
> APT::VersionedKernelPackages:: "gnumach-image";
> APT::VersionedKernelPackages:: ".*-modules";
> APT::VersionedKernelPackages:: ".*-kernel";
> APT::VersionedKernelPackages:: "linux-backports-modules-.*";
> APT::VersionedKernelPackages:: "linux-tools";
> APT::Never-MarkAuto-Sections "";
> APT::Never-MarkAuto-Sections:: "metapackages";
> APT::Never-MarkAuto-Sections:: "restricted/metapackages";
> APT::Never-MarkAuto-Sections:: "universe/metapackages";
> APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
> APT::Never-MarkAuto-Sections:: "oldlibs";
> APT::Never-MarkAuto-Sections:: "restricted/oldlibs";
> APT::Never-MarkAuto-Sections:: "universe/oldlibs";
> APT::Never-MarkAuto-Sections:: "multiverse/oldlibs";
> APT::Architectures "";
> APT::Architectures:: "i386";
> APT::Compressor "";
> APT::Compressor::. "";
> APT::Compressor::.::Name ".";
> APT::Compressor::.::Extension "";
> APT::Compressor::.::Binary "";
> APT::Compressor::.::Cost "1";
> APT::Compressor::gzip "";
> APT::Compressor::gzip::Name "gzip";
> APT::Compressor::gzip::Extension ".gz";
> APT::Compressor::gzip::Binary "gzip";
> APT::Compressor::gzip::Cost "2";
> APT::Compressor::gzip::CompressArg "";
> APT::Compressor::gzip::CompressArg:: "-9n";
> APT::Compressor::gzip::UncompressArg "";
> APT::Compressor::gzip::UncompressArg:: "-d";
> APT::Compressor::bzip2 "";
> APT::Compressor::bzip2::Name "bzip2";
> APT::Compressor::bzip2::Extension ".bz2";
> APT::Compressor::bzip2::Binary "bzip2";
> APT::Compressor::bzip2::Cost "3";
> APT::Compressor::bzip2::CompressArg "";
> APT::Compressor::bzip2::CompressArg:: "-9";
> APT::Compressor::bzip2::UncompressArg "";
> APT::Compressor::bzip2::UncompressArg:: "-d";
> APT::Compressor::xz "";
> APT::Compressor::xz::Name "xz";
> APT::Compressor::xz::Extension ".xz";
> APT::Compressor::xz::Binary "xz";
> APT::Compressor::xz::Cost "4";
> APT::Compressor::xz::CompressArg "";
> APT::Compressor::xz::CompressArg:: "-6";
> APT::Compressor::xz::UncompressArg "";
> APT::Compressor::xz::UncompressArg:: "-d";
> APT::Compressor::lzma "";
> APT::Compressor::lzma::Name "lzma";
> APT::Compressor::lzma::Extension ".lzma";
> APT::Compressor::lzma::Binary "xz";
> APT::Compressor::lzma::Cost "5";
> APT::Compressor::lzma::CompressArg "";
> APT::Compressor::lzma::CompressArg:: "--format=lzma";
> APT::Compressor::lzma::CompressArg:: "-9";
> APT::Compressor::lzma::UncompressArg "";
> APT::Compressor::lzma::UncompressArg:: "--format=lzma";
> APT::Compressor::lzma::UncompressArg:: "-d";
> Dir "/";
> Dir::State "var/lib/apt/";
> Dir::State::lists "lists/";
> Dir::State::cdroms "cdroms.list";
> Dir::State::mirrors "mirrors/";
> Dir::State::extended_states "extended_states";
> Dir::State::status "/var/lib/dpkg/status";
> Dir::Cache "var/cache/apt/";
> Dir::Cache::archives "archives/";
> Dir::Cache::srcpkgcache "srcpkgcache.bin";
> Dir::Cache::pkgcache "pkgcache.bin";
> Dir::Etc "etc/apt/";
> Dir::Etc::sourcelist "sources.list";
> Dir::Etc::sourceparts "sources.list.d";
> Dir::Etc::vendorlist "vendors.list";
> Dir::Etc::vendorparts "vendors.list.d";
> Dir::Etc::main "apt.conf";
> Dir::Etc::netrc "auth.conf";
> Dir::Etc::parts "apt.conf.d";
> Dir::Etc::preferences "preferences";
> Dir::Etc::preferencesparts "preferences.d";
> Dir::Etc::trusted "trusted.gpg";
> Dir::Etc::trustedparts "trusted.gpg.d";
> Dir::Bin "";
> Dir::Bin::methods "/usr/lib/apt/methods";
> Dir::Bin::solvers "";
> Dir::Bin::solvers:: "/usr/lib/apt/solvers";
> Dir::Bin::dpkg "/usr/bin/dpkg";
> Dir::Bin::bzip2 "/bin/bzip2";
> Dir::Bin::xz "/usr/bin/xz";
> Dir::Bin::lzma "/usr/bin/xz";
> Dir::Media "";
> Dir::Media::MountPath "/media/cdrom";
> Dir::Log "var/log/apt";
> Dir::Log::Terminal "term.log";
> Dir::Log::History "history.log";
> Dir::Ignore-Files-Silently "";
> Dir::Ignore-Files-Silently:: "~$";
> Dir::Ignore-Files-Silently:: "\.disabled$";
> Dir::Ignore-Files-Silently:: "\.bak$";
> Dir::Ignore-Files-Silently:: "\.dpkg-[a-z]+$";
> Dir::Ignore-Files-Silently:: "\.save$";
> Dir::Ignore-Files-Silently:: "\.orig$";
> Dir::Ignore-Files-Silently:: "\.distUpgrade$";
> Acquire "";
> Acquire::cdrom "";
> Acquire::cdrom::mount "/media/cdrom";
> Acquire::Languages "";
> Acquire::Languages:: "en";
> Acquire::Languages:: "none";
> Aptitude "";
> Aptitude::Get-Root-Command "sudo:/usr/bin/sudo";
> DPkg "";
> DPkg::Pre-Install-Pkgs "";
> DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
> CommandLine "";
> CommandLine::AsString "apt-config dump";
>
> -- (no /etc/apt/preferences present) --
>
>
> -- /etc/apt/sources.list --
>
> deb http://ftp.nl.debian.org/debian/ unstable main
> deb-src http://ftp.nl.debian.org/debian/ jessie main
>
> deb http://security.debian.org/ jessie/updates main
> deb-src http://security.debian.org/ jessie/updates main
>
> # jessie-updates, previously known as 'volatile'
> deb http://ftp.nl.debian.org/debian/ jessie-updates main
> deb-src http://ftp.nl.debian.org/debian/ jessie-updates main
>
> # jessie-backports, previously on backports.debian.org
> deb http://ftp.nl.debian.org/debian/ jessie-backports main
> deb-src http://ftp.nl.debian.org/debian/ jessie-backports main
>
> -- System Information:
> Debian Release: stretch/sid
> APT prefers stable-updates
> APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'stable')
> Architecture: i386 (i686)
>
> Kernel: Linux 4.1.0-2-686-pae (SMP w/3 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
>
> Versions of packages apt depends on:
> ii debian-archive-keyring 2014.3
> ii gnupg 1.4.19-5
> ii libapt-pkg4.16 1.0.10.2
> ii libc6 2.19-22
> ii libgcc1 1:5.2.1-17
> ii libstdc++6 5.2.1-17
>
> apt recommends no packages.
>
> Versions of packages apt suggests:
> pn apt-doc <none>
> pn aptitude | synaptic | wajig <none>
> pn dpkg-dev <none>
> ii python-apt 1.0.0
>
> -- no debconf information
>
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