Description of problem: My today's rawhide upgrade seems to be very CPU intensive task for 'dnf'. It spends nearly 1.5 minute before it starts to download package from the moment I confirm upgrade transaction. I've even upgraded to very later libsolv library available at koji/updates. Perf record seems to point to heavy usage of these functions: 46.01% dnf libsolv.so.0 [.] dataiterator_step | --- dataiterator_step 8.53% dnf libc-2.21.90.so [.] __GI___strcmp_ssse3 | --- __GI___strcmp_ssse3 7.38% dnf libsolv.so.0 [.] data_skip_key.isra.5 | --- data_skip_key.isra.5 4.29% dnf libhawkey.so.2 [.] 0x000000000000f425 | |--34.48%-- 0x7fadf9b157d6 | hy_query_run_set | 0x55fc8051a108 | |--14.16%-- 0x7fadf9b15425 | hy_query_run_set | 0x55fc8051a108 4.29% dnf libc-2.21.90.so [.] strlen | --- strlen Version-Release number of selected component (if applicable): libsolv-0.6.11-1.fc23.x86_64 How reproducible: Steps to Reproduce: 1.dnf upgrade 2.confirm 'y' 3.measure time before download really starts Actual results: Expected results: Additional info:
Created attachment 1042319 [details] My current list of rawhide rpm packages
Created attachment 1042331 [details] timed dnf upgrade --assumeno
Created attachment 1042337 [details] /var/log/hawkey.log
This bug appears to have been reported against 'rawhide' during the Fedora 23 development cycle. Changing version to '23'. (As we did not run this process for some time, it could affect also pre-Fedora 23 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 23 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora23
*** This bug has been marked as a duplicate of bug 1194222 ***
I think the cause is the bad performance of queries. The depsolving is fast.