Package: apt Version: 1.0.7 Severity: normal Dear Maintainer,
The current implementation of the http method puts a much higher load on the CPU than a similar call done in wget or curl. As an example I downloaded a large file from the deb mirror (0ad-data) which is then cached by local squid. Which in turn then provides higher transfer rates in case I download it again and causing this bug to appear: cli: % apt-get download 0ad-data Get:1 http://ftp.de.debian.org/debian/ jessie/main 0ad-data all 0.0.16-1 [530 MB] 46% [1 0ad-data 247 MB/530 MB 46%] 24.6 MB/s 11s top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 8516 weller 20 0 5516 4200 3944 R 99.4 0.0 0:04.60 http For comparison the same download with wget: cli: % wget http://ftp.de.debian.org/debian/pool/main/0/0ad-data/0ad-data_0.0.16-1_all.deb (58.5 MB/s) - '0ad-data_0.0.16-1_all.deb' saved [530253138/530253138] top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 12578 weller 20 0 5992 4104 3712 R 18.2 0.0 0:00.57 wget As you can see from these lines the download is capped by the http method to almost 40% of the transfer rate due to the single core CPU usage. My guess is that this problem stems from the circular buffer design used in the http method which might've provided a speed boost back in the day but hinders it now. /proc/cpuinfo: processor : 31 model name : Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz cpu MHz : 2328.042 -- Package-specific info: -- (/etc/apt/preferences present, but not submitted) -- -- (/etc/apt/sources.list present, but not submitted) -- -- System Information: Debian Release: jessie/sid APT prefers testing APT policy: (550, 'testing'), (500, 'stable'), (210, 'unstable'), (1, 'experimental') Architecture: i386 (x86_64) Kernel: Linux 3.15.3-64+ (SMP w/32 CPU cores; PREEMPT) Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Shell: /bin/sh linked to /bin/dash Versions of packages apt depends on: ii debian-archive-keyring 2012.4 ii gnupg 1.4.18-2 ii libapt-pkg4.12 1.0.7 ii libc6 2.19-9bfw1 ii libgcc1 1:4.9.1-4bfw1 ii libstdc++6 4.9.1-4bfw1 apt recommends no packages. Versions of packages apt suggests: pn apt-doc <none> ii aptitude 0.6.11-1bfw1 ii dpkg-dev 1.17.13 ii python-apt 0.9.3.9 -- Configuration Files: /etc/logrotate.d/apt changed [not included] -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org