devel August 2019

devel@lists.stg.fedoraproject.org

236 participants
361 discussions

Re: Better interactivity in low-memory situations
by Gordan Bobic 04 Sep '19

04 Sep '19

On Sun, Aug 11, 2019 at 10:36 AM <mcatanzaro(a)gnome.org> wrote: > This seems like a distraction from the real goal here, which is to > ensure Fedora remains responsive under heavy memory pressure, I think this is an overwhelmingly important point, and as somebody regularly working with ARM machines with tiny amounts of RAM, it is of considerable interest to me. I typically use CentOS because stability is important to me, but most worthwhile things filter to there, so I hope what I'm about to say is not _too_ deprecated. 1) Compile options From what I can tell from rpm macro options, default on C7 seems to be -O2. -Os seems to help in most cases. Adding -ffunction-sections -fdata-sections to defaults can help considerably in producing smaller binaries, and is not the default. Linking with -Wl,--gc-sections helps a lot and is not the default Extensive stripping seems to already be the default (--strip-unneeded, removal of .comment and .note sections) 2) Runtime condiguration Default stack size is 8192 (ulimit -s). This unnecessarily eats a considerably amount of memory. I have yet to see anything that actually experiences problems with 1M. 3) zram This was mentioned earlier in the thread, and on most of my systems, memory constrained or otherwise, unless I have an overwhelming reason not to, I run with zram swap equal in size to RAM with lz4 compression and vm.swappiness=100. I typically see compression ratios between 2:1 and 3:1 in zram, so on a system with, say, 10GB of RAM, it would provide 10GB of very fast swap at a cost of 3-5GB of RAM. This seems like a favourable trade off, especially on systems with extremely constrained RAM (e.g. ARM devices with 512MB of RAM). I'm sure there is more that can be done, but this seems like a good start as far as the cost / benefit is concerned.

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BackupPC selinux help
by Richard Shaw 04 Sep '19

04 Sep '19

I've got a bug report[1] for BackupPC where the user is having issues with AVC denials when browsing hosts. This is actually from my COPR but it's the same SRPM I use for Fedora. There are almost 50k downloads and this is the only report of a problem so I don't think there's a fundamental issue with the package but I would still like to help them out. They are getting AVC denials when browsing hosts which seems to cause BackupPC_Admin to write LOCK files in the subdirectories of /var/lib/BackupPC/. I can find plenty of LOCK files written in my instance of BackupPC on Centos 7 (same as the user) but NO AVC denials for me. Here's a snippit from the bug: $ sudo tail -f /var/log/audit/audit.log | grep avc type=AVC msg=audit(1567181425.724:40002): avc: denied { write } for pid=3608 comm="BackupPC_Admin" name="LOCK" dev="sda1" ino=336086870 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0 type=AVC msg=audit(1567181425.730:40003): avc: denied { write } for pid=3608 comm="BackupPC_Admin" name="LOCK" dev="sda1" ino=109977609 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0 ... It happens one for every host he backs up so the inodes are different but the error is the same for all. Currently the selinux policy built into the package doesn't modify /var/lib/BackupPC but in my experience it hasn't needed to. He's already tried restorecon, changed from a symlink to a bind mount (for the backup root)... I'm hesitant to modify the the selinux policy when I can reproduce the problem... Ideas? [1] https://bugzilla.redhat.com/show_bug.cgi?id=1746598

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Fedora Workstation and disabled by default firewall
by Vitaly Zaitsev 04 Sep '19

04 Sep '19

Hello all. Is it okay that firewall is completely disabled by default (opened all ports 1025-65535) on Fedora Workstation? I think that this is a major vulnerability and it must be fixed by changing default zone to public. firewall-cmd --list-all FedoraWorkstation (active) target: default icmp-block-inversion: no interfaces: enp1s0 sources: services: dhcpv6-client mdns samba-client ssh ports: 1025-65535/udp 1025-65535/tcp protocols: masquerade: no forward-ports: source-ports: icmp-blocks: rich rules: -- Sincerely, Vitaly Zaitsev (vitaly(a)easycoding.org)

34 163

Debates/back and forths
by Danny Lee 04 Sep '19

04 Sep '19

Hi all, I'm new to the devel list and fedora in general, but i was wondering if these kind of back and forths between a few people is a frequent occurrence. I came to Fedora to volunteer what little spare time I have to help the Fedora project in some little ways. I don't feel that should include wading through dozens of emailed back and forths between individuals who seem to have strong, immovable opinions, I just don't have time for that. Is there any chance there is a moderated list or discussion group about current project tasks and issues rather than debates about how to do things? Or perhaps, a way to turn off certain threads or block certain posters? Thanks for your time and info you can provide.

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How do I remove GLIBCXX_ASSERTIONS?
by Steven A. Falco 03 Sep '19

03 Sep '19

The upstream KiCAD project has requested that I remove GLIBCXX_ASSERTIONS from the Fedora package, as described here: https://bugs.launchpad.net/kicad/+bug/1838448 What is the best way to do that? I can add "%undefine _hardened_build" (which I am testing now) but I think that will remove other hardening features that I might want to leave enabled. Steve

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f32/rawhide, nothing provides module(platform:f31)
by Kaleb Keithley 03 Sep '19

03 Sep '19

`dnf update` on my f32/rawhide machine is giving me: Problem 1: conflicting requests - nothing provides module(platform:f31) needed by module bat:latest:3120190714171319:22d7e2a5-0.x86_64 Problem 2: conflicting requests - nothing provides module(platform:f31) needed by module exa:latest:3120190721165838:22d7e2a5-0.x86_64 Problem 3: conflicting requests - nothing provides module(platform:f31) needed by module libgit2:0.28:3120190714114509:f636be4b-0.x86_64 Problem 4: conflicting requests - nothing provides module(platform:f31) needed by module silver:rolling:3120190728135623:22d7e2a5-0.x86_64 What do I need to do for this? Thanks, -- Kaleb

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[HEADS UP] Fedora 32 Python 3.8 rebuilds have started in a side tag
by Miro Hrončok 02 Sep '19

02 Sep '19

Hello, in order to deliver Python 3.8, we are running a coordinated rebuild in a side tag. https://fedoraproject.org/wiki/Changes/Python3.8 If you see a "Rebuild for Python 3.8" commit in your package, please don't rebuild it in regular rawhide. If you need to, please let me know, so we can coordinate. If you'd like to update the package, you should be able to build it in the side tag via: on branch master: $ fedpkg build --target=f32-python Note that it will take a while before the essential packages are rebuilt, so don't except all your dependencies to be available right away. Thanks. Let us know if you have any questions. -- Miro Hrončok -- Phone: +420777974800 IRC: mhroncok

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testing oomd, cgroupsv2, was: Better interactivity in low-memory situations
by Chris Murphy 01 Sep '19

01 Sep '19

Hi, This is a follow-up for this thread: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org… Has anyone looked at oomd, or is anyone interested in testing and comparing it to alternatives? https://facebookmicrosites.github.io/oomd/docs/overview https://news.ycombinator.com/item?id=17590858 The origin for oomd is servers, and the case study at Facebook is also server centric. But oomd is also very flexible, with the option to arrive over the medium term a cooperative approach to resource management. However, my more immediate interest is to make heavy memory pressure and swap usage (versus incidental use of swap) result in a more predictable outcome. Right now this is all over the map, maybe the process you would have picked to kill (if you could) is killed. Maybe something else is killed and you don't notice, but it frees up just enough memory to prevent anything else from being killed, and now you're stuck in swap hell. It's a lot of maybes. And the final implosion of a system isn't really what matters because at this point, once it happens, the system is already in some kind of tail spin. And what that means is we can't even really iterate on any improvements because all the outcomes right now appear to suck. So how about avoiding tail spins in the first place? And a quick search, Lennart mentions oomd in the 'raise fileno limit...' thread from Oct 2018 during early discussions of cgroupsv2. -- Chris Murphy

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Fedora 31 System-Wide Change proposal: Switch RPMs to zstd compression
by Ben Cotton 01 Sep '19

01 Sep '19

https://fedoraproject.org/wiki/Changes/Switch_RPMs_to_zstd_compression = Switch RPMs to zstd compression = == Summary == Binary RPMs are currently compressed with xz level 2. Switching to zstd would increase decompression speed significantly. == Owner == * Name: [[User:dmach| Daniel Mach]] * Email: dmach(a)redhat.com == Detailed Description == * The change requires setting a new compression algorithm in rpm macros. Then a mass rebuild of all packages is required. * The macro for setting the compression is: %define _binary_payload w19.zstdio * The recommended compression level is 19. The builds will take longer, but the additional compression time is negligible in the total build time and it pays off in better compression ratio than xz lvl2 has. * SRPM payload compression should stay at gzip (there's almost no benefit in changing the compression, because SRPM's contents is compressed already) === Use case: Firefox installation === I rebuilt firefox-66.0.5-1.fc30 with zstd level19. Then I compared installation times with the original (xz compressed) package: {| class="wikitable" |- ! Compression !! Target File System !! Time |- | xz level 2 || tmpfs || 8s |- | xz level 2 || ext4 on nvme || 11s |- | zstd level 19 || tmpfs || 2s |- | zstd level 19 || ext4 on nvme || 4s |- |} === Comparison of compression algorithms and levels === Following table shows '''cpio''' and '''compressed cpio''' extraction times into a tmpfs. Actual times in decompressing RPMs will differ due to extracting on an actual disk and also some overhead in the RPM tool (checks, scriptlets). {| class="wikitable" |- ! Compression !! Level !! Size B !! Size GiB !! Compression time !! Compression time, 4 threads !! Decompression time !! Comment |- | CPIO || - || 5016785692 || 4,7 || - || - || - || |- | xz || 2 || 1615017616 || 1,6 || 9m55s || - || 1m36s || slow decompression |- | pxz || 2 || 1631869880 || 1,6 || - || 6m11s || 1m38s || slow decompression |- | gzip || 9 || 2086354992 || 2,0 || 10m23s || - || 31s || insufficient compression ratio |- | bzip2 || 9 || 1889161565 || 1,8 || 8m || - || 2m50s || very slow decompression; compression ratio could be better |- | zstd || 3 || 1913536587 || 1,8 || 31s || 29s || 6,5s || |- | zstd || 10 || 1737928978 || 1,7 || 3m27s || 2m34s || 6,3s || |- | zstd || 15 || 1717303256 || 1,7 || 9m37s || 6m34s || 6,3s || identical compression speed to xz; fast decompression; slightly worse compression ratio than xz |- | zstd || 17 || 1635525492 || 1,6 || 16m16s || 11m20s || 6,7s || |- | zstd || 19 || 1575843696 || 1,5 || 24m2s || 18m55s || 7,7s || |- |} == Benefit to Fedora == * Faster installations/upgrades of user systems * Faster koji builds (installations in build roots) * Faster container builds * Lower bandwidth on mirrors if we choose the highest compression level == Scope == * Proposal owners: submit a patch to redhat-rpm-config * Other developers: redhat-rpm-config maintainer: include the patch and make a new build * Release engineering: [https://pagure.io/releng/issue/8345 #8345] mass rebuild is needed == Upgrade/compatibility impact == * RPM in Fedora supports zstd compression already (from Fedora 28, rpm-4.14.0-0.rc2.5.fc28). No impact on Fedora users is expected. * Fedora <= 27 and some other distros will not be able to decompress zstd-compressed RPMs. == How To Test == * dnf install <package> * rpm -q --qf "%{PAYLOADCOMPRESSOR} %{PAYLOADFLAGS}\n" <package> * expected output: zstd 19 Also the overall system installation time should decrease significantly. == User Experience == See '''Benefit to Fedora''' == Dependencies == N/A == Contingency Plan == * Contingency mechanism: Not needed, Fedora will stay at current compression. * Contingency deadline: N/A * Blocks release? No * Blocks product? N/A == Documentation == N/A == Release Notes == RPMs have switched to zstd compression level 19. Users will benefit from faster package decompression. Users that build their packages will experience slightly longer build times. -- Ben Cotton He / Him / His Fedora Program Manager Red Hat TZ=America/Indiana/Indianapolis

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Fedora 31 compose report: 20190831.n.0 changes
by Fedora Branched Report 31 Aug '19

31 Aug '19

OLD: Fedora-31-20190829.n.0 NEW: Fedora-31-20190831.n.0 ===== SUMMARY ===== Added images: 3 Dropped images: 1 Added packages: 2 Dropped packages: 5 Upgraded packages: 7 Downgraded packages: 0 Size of added packages: 949.00 KiB Size of dropped packages: 26.63 MiB Size of upgraded packages: 9.05 MiB Size of downgraded packages: 0 B Size change of upgraded packages: -372.42 KiB Size change of downgraded packages: 0 B ===== ADDED IMAGES ===== Image: Server raw-xz aarch64 Path: Server/aarch64/images/Fedora-Server-31-20190831.n.0.aarch64.raw.xz Image: Workstation raw-xz aarch64 Path: Workstation/aarch64/images/Fedora-Workstation-31-20190831.n.0.aarch64.raw.xz Image: SoaS raw-xz armhfp Path: Spins/armhfp/images/Fedora-SoaS-armhfp-31-20190831.n.0-sda.raw.xz ===== DROPPED IMAGES ===== Image: Silverblue dvd-ostree x86_64 Path: Silverblue/x86_64/iso/Fedora-Silverblue-ostree-x86_64-31-20190829.n.0.iso ===== ADDED PACKAGES ===== Package: gnome-python2-desktop-2.32.0-38.fc31 Summary: The sources for additional PyGNOME Python extension modules RPMs: gnome-python2-desktop gnome-python2-gnomekeyring gnome-python2-libwnck gnome-python2-rsvg Size: 592.79 KiB Package: pacrunner-0.14-1.fc30 Summary: Proxy configuration d��mon RPMs: pacrunner Size: 356.21 KiB ===== DROPPED PACKAGES ===== Package: compat-SFML16-1.6-21.fc31 Summary: Simple and Fast Multimedia Library RPMs: compat-SFML16 compat-SFML16-devel Size: 5.60 MiB Package: dpm-contrib-admintools-0.2.5-2.fc31 Summary: DPM administration toolkit (contrib from GridPP) RPMs: dpm-contrib-admintools Size: 322.17 KiB Package: lcgdm-1.13.0-2.fc31 Summary: LHC Computing Grid Data Management RPMs: dpm dpm-copy-server-mysql dpm-devel dpm-libs dpm-name-server-mysql dpm-perl dpm-rfio-server dpm-server-mysql dpm-srm-server-mysql lcgdm-devel lcgdm-libs lfc lfc-devel lfc-dli lfc-libs lfc-perl lfc-server-mysql python2-dpm python2-lfc python3-dpm python3-lfc Size: 19.57 MiB Package: puddletag-1.2.0-9.fc31 Summary: Feature rich, easy to use tag editor RPMs: puddletag Size: 1.08 MiB Package: standard-test-roles-4.3-1.module_f31+5938+451518a9 Summary: Standard Test Interface Ansible roles RPMs: standard-test-roles standard-test-roles-inventory-docker standard-test-roles-inventory-qemu Size: 72.78 KiB ===== UPGRADED PACKAGES ===== Package: gnome-python2-2.28.1-27.fc31 Old package: gnome-python2-2.28.1-23.fc29 Summary: PyGNOME Python extension module RPMs: gnome-python2 gnome-python2-bonobo gnome-python2-canvas gnome-python2-devel gnome-python2-gconf gnome-python2-gnome gnome-python2-gnomevfs Size: 2.16 MiB Size change: -370.25 KiB Changelog: * Fri Jul 13 2018 Fedora Release Engineering <releng(a)fedoraproject.org> - 2.28.1-24 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild * Thu Jan 31 2019 Fedora Release Engineering <releng(a)fedoraproject.org> - 2.28.1-25 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild * Thu Jul 25 2019 Fedora Release Engineering <releng(a)fedoraproject.org> - 2.28.1-26 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 2.28.1-27 - Fix FTBFS Package: python-blivet-1:3.1.5-2.fc31 Old package: python-blivet-1:3.1.5-1.fc31 Summary: A python module for system storage configuration RPMs: blivet-data python3-blivet Size: 869.24 KiB Size change: -2.41 KiB Changelog: * Tue Aug 27 2019 Vojtech Trefny <vtrefny(a)redhat.com> - 3.1.5-2 - Do not try to normalize size for zero size device factories (#1743753) Package: sugar-0.114-1.fc31 Old package: sugar-0.113-4.fc31 Summary: Constructionist learning platform RPMs: sugar sugar-cp-all sugar-cp-background sugar-cp-backup sugar-cp-datetime sugar-cp-frame sugar-cp-keyboard sugar-cp-language sugar-cp-modemconfiguration sugar-cp-network sugar-cp-power sugar-cp-updater sugar-cp-webaccount Size: 1.22 MiB Size change: -3.23 KiB Changelog: * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 0.114-1 - Update to 0.114 release Package: sugar-artwork-0.114-1.fc31 Old package: sugar-artwork-0.113-2.fc31 Summary: Artwork for Sugar look-and-feel RPMs: sugar-artwork Size: 1.07 MiB Size change: -1.19 KiB Changelog: * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 0.114-1 - Update to 0.114 release Package: sugar-browse-203.1-1.fc31 Old package: sugar-browse-203-2.fc31 Summary: Browse activity for Sugar RPMs: sugar-browse Size: 367.47 KiB Size change: -84 B Changelog: * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 203.1-1 - Update to 203.1 release Package: sugar-datastore-0.114-1.fc31 Old package: sugar-datastore-0.113-2.fc31 Summary: Sugar Datastore RPMs: sugar-datastore Size: 318.77 KiB Size change: -1.19 KiB Changelog: * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 0.114-1 - Update to 0.114 release Package: sugar-toolkit-gtk3-0.114-1.fc31 Old package: sugar-toolkit-gtk3-0.113-3.fc31 Summary: Sugar toolkit GTK+ 3 RPMs: sugar-toolkit-gtk3 sugar-toolkit-gtk3-devel Size: 3.08 MiB Size change: 5.92 KiB Changelog: * Wed Aug 28 2019 Peter Robinson <pbrobinson(a)fedoraproject.org> 0.114-1 - Update to 0.114 release ===== DOWNGRADED PACKAGES =====

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devel August 2019