Package: squashfs-tools Version: 1:4.3-11 Severity: normal Dear Maintainer,
The mksquashfs from squashfs-tools 1:4.3-11 somehow can not make use all CPU cores. I found this when making a Debian live Sid system on my Stretch amd64 machine. Hence I have tried different versions of squashfs-tools. For mksquashfs from squashfs-tools 1:4.3-11 , I ran it by: time sudo mksquashfs squashfs-root filesystem.squashfs.new -b 1024k -comp xz -Xbcj x86 -e boot -no-progress The results: ===== Parallel mksquashfs: Using 16 processors Creating 4.0 filesystem on filesystem.squashfs.new, block size 1048576. [=========================================================================================================\] 26729/26729 100% Exportable Squashfs 4.0 filesystem, xz compressed, data block size 1048576 compressed data, compressed metadata, compressed fragments, compressed xattrs duplicates are removed Filesystem size 225629.14 Kbytes (220.34 Mbytes) 22.96% of uncompressed filesystem size (982728.66 Kbytes) Inode table size 270992 bytes (264.64 Kbytes) 23.39% of uncompressed inode table size (1158359 bytes) Directory table size 302522 bytes (295.43 Kbytes) 41.51% of uncompressed directory table size (728752 bytes) Number of duplicate files found 1981 Number of inodes 34931 Number of files 26518 Number of fragments 660 Number of symbolic links 4255 Number of device nodes 9 Number of fifo nodes 0 Number of socket nodes 0 Number of directories 4149 Number of ids (unique uids + gids) 15 Number of uids 4 root (0) messagebus (104) www-data (33) colord (108) Number of gids 13 root (0) dip (30) adm (4) shadow (42) nogroup (65534) utmp (43) tty (5) messagebus (109) crontab (107) staff (50) avahi (110) www-data (33) mail (8) real 5m38.136s user 10m51.448s sys 0m2.184s ===== In the beginning, from htop, I can see all the CPU cores are used, but suddenly there is only 1 or 2 cores are used. If I downgraded squashfs-tools to 1:4.3-10, the result from the time command: real 2m28.566s user 7m55.324s sys 0m1.819s Furthermore, when squashfs-tools 1:4.3-9 was used, the result: real 1m2.466s user 16m17.904s sys 0m7.610s Something has changed between 1:4.3-9 to 1:4.3-11, so it took much longer to create squashfs file system. If you need more tests or info, please let me know. Thanks you very much. Steven -- System Information: Debian Release: 9.7 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.18.0-0.bpo.3-amd64 (SMP w/16 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages squashfs-tools depends on: ii libc6 2.24-11+deb9u3 ii liblz4-1 0.0~r131-2+b1 ii liblzma5 5.2.2-1.2+b1 ii liblzo2-2 2.08-1.2+b2 ii libzstd1 1.3.8+dfsg-3 ii zlib1g 1:1.2.8.dfsg-5 squashfs-tools recommends no packages. squashfs-tools suggests no packages. -- no debconf information -- Steven Shiau <steven _at_ stevenshiau org> Public Key Server PGP Key ID: 4096R/163E3FB0 Fingerprint: EB1D D5BF 6F88 820B BCF5 356C 8E94 C9CD 163E 3FB0
