Bug 662347
| Summary: | dependency solving by file name is very slow | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | John Reiser <jreiser> |
| Component: | yum | Assignee: | Packaging Maintenance Team <packaging-team-maint> |
| Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 19 | CC: | ffesti, james.antill, maxamillion, pmatilai, tim.lauridsen |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-02-17 13:32:03 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
John Reiser
2010-12-11 21:51:35 UTC
> libguestfs has about 190 dependencies; about 140 of them are file names (not > package names). Why? You don't even need package names as they are all libraries like: /usr/lib64/libssl.so.10 /lib64/libcap.so.2 /lib64/libc.so.6 [...] ...at _best_ this will require the user having to download filelists. We know the filelists has a bad schema, and want to change the repodata ... but getting the time to do a change like that isn't easy (esp. now). > Applying 'strace' shows that the ...-filelists.sqlite is > searched linearly for each dependent file name. If filelists.sqlite does not > have an index which enables random access by file name Yes, it does. Putting some debugging in there, though I see we were running some debug code for every file lookup ... which is fine normally (when we do a couple of file looksup total) as it only has an overhead of about 0.1 second, libguestfs isn't normal though. It's still not perfect, but for comparison: Before: sudo repoquery --verbose --requires libguestfs --resolve 16.64s user 0.43s system 99% cpu 17.226 total After: sudo repoquery --verbose --requires libguestfs --resolve 4.42s user 0.18s system 99% cpu 4.629 total ...as a comparison, perl has ~194 requirements (although they mostly come from perl itself): sudo repoquery --verbose --requires perl --resolve 1.96s user 0.13s system 94% cpu 2.219 total This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19 This message is a notice that Fedora 19 is now at end of life. Fedora has stopped maintaining and issuing updates for Fedora 19. It is Fedora's policy to close all bug reports from releases that are no longer maintained. Approximately 4 (four) weeks from now this bug will be closed as EOL if it remains open with a Fedora 'version' of '19'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 19 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed. |