On Fri, 2022-09-02 at 22:43 +0200, Fabio Valentini wrote: > On Thu, Sep 1, 2022 at 8:02 PM Demi Marie Obenour <demioben...@gmail.com> > wrote: > > > > On 9/1/22 13:47, Jaroslav Mracek wrote: > > > With loading or not loading file list it is not so easy or in general - > > > performance optimization is allways a trade one resource for another one > > > or for some features. DNF5 will provide a setting to not load file list, > > > as well to not create disk cache, or not using zchunk (already > > > implemented in DNF). How it can help? It allows to trade download for > > > disk space and CPU, or RAM for HDD, or RAM, HDD, CPU for features. And > > > each user prefers or requires different different things. > > > > > > Without file lists there will be not available some functionality: > > > 1 dnf install/repoquery/whatprovides <file outside of /etc and > > > /usr/(s)bin> => will not work > > > 2. resolve transaction can fail - keep in mind that people are not only > > > using packages from Fedora distribution. > > > > From my perspective, the main problem here is that DNF (possibly via > > libsolv) loads all metadata into memory, instead of only the parts > > it actually needs. This should not be necessary, and I consider it > > a significant limitation of DNF. > > I wonder, would it be better for memory-constrained systems to memmap > (and possibly uncompress on disk before doing that, if necessary) > repository data instead of loading it into memory directly? Or is the > limitation not the size of the repository data itself, but the > in-memory data structures that are generated *from* it?
Before this goes too far into the weeds, please remember DNF is already being revised to do this a lot better. The numbers about that are in the original bug report. Whenever DNF 5 lands in Fedora, the problem should get a lot smaller. -- Adam Williamson Fedora QA IRC: adamw | Twitter: adamw_ha https://www.happyassassin.net _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
