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This is a prerequisite for #3074, see that ticket for more details.
Fields changed
milestone: NEEDS_TRIAGE => SSSD 1.14.2
rhbz: => 0
Moving tickets that didn't make it into the 1.14.2 release into the next point release.
milestone: SSSD 1.14.2 => SSSD 1.14.3
id performance statistics with both caches in tmpfs:
WARNING: Missing unwind data for a module, rerun with 'stap -d /usr/lib64/libtevent.so.0.9.28' Total run time of id was: 35260 ms Number of zero-level cache transactions: 537 Time spent in level-0 sysdb transactions: 19004 ms Time spent writing to LDB: 17 ms Number of LDAP searches: 1114 Time spent waiting for LDAP: 10819 ms LDAP searches breakdown: Number of user requests: 1 Time spent in user requests: 7
Number of group requests: 534 Time spent in group requests: 31628 Number of initgroups requests: 1 Time spent in initgroups requests: 109
Unaccounted time: 5437 ms sysdb transaction breakdown:
and the group searches breakdown, since the group requests took the most time:
stap /sssd/contrib/systemtap/nested_group_perf.stp ^CTime spent in group sssd_be searches: 33346 Time spent in sdap_nested_group_send/recv: 11106 ms (ratio: 33.30%) Time spent in zero-level sysdb transactions: 20299 ms (ratio: 60.87%) Breakdown of sdap_nested_group req (total: 11106 ms) sdap_nested_group_process req: 11084 sdap_nested_group_process_split req: 1110 sdap_nested_group_check_cache: 1095 sdap_nested_group_sysdb_search_users: 660 sdap_nested_group_sysdb_search_groups: 412 ldap request breakdown of total 9564 sdap_nested_group_deref req: 9904 sdap_deref_search_send req 9494 processing deref results: 402 sdap_nested_group_lookup_user req: 35 sdap_nested_group_lookup_group req: 0 Time spent refreshing unknown members: 35 Breakdown of results processing (total 20299) Time spent populating nested members: 18653 Time spent searching ldb while populating nested members: 15927 Time spent saving nested members: 1535 Time spent writing to the ldb: 3 ms
id performance statistics with both caches on a regular partition on an SSSD drive:
Total run time of id was: 35623 ms Number of zero-level cache transactions: 537 Time spent in level-0 sysdb transactions: 19310 ms Time spent writing to LDB: 29 ms Number of LDAP searches: 1114 Time spent waiting for LDAP: 10825 ms LDAP searches breakdown: Number of user requests: 1 Time spent in user requests: 12
Number of group requests: 534 Time spent in group requests: 31952 Number of initgroups requests: 1 Time spent in initgroups requests: 116
Unaccounted time: 5488 ms
group requests breakdown
stap /sssd/contrib/systemtap/nested_group_perf.stp ^CTime spent in group sssd_be searches: 32576 Time spent in sdap_nested_group_send/recv: 10788 ms (ratio: 33.11%) Time spent in zero-level sysdb transactions: 19834 ms (ratio: 60.88%) Breakdown of sdap_nested_group req (total: 10788 ms) sdap_nested_group_process req: 10771 sdap_nested_group_process_split req: 1100 sdap_nested_group_check_cache: 1078 sdap_nested_group_sysdb_search_users: 689 sdap_nested_group_sysdb_search_groups: 355 ldap request breakdown of total 9266 sdap_nested_group_deref req: 9611 sdap_deref_search_send req 9199 processing deref results: 406 sdap_nested_group_lookup_user req: 33 sdap_nested_group_lookup_group req: 0 Time spent refreshing unknown members: 34 Breakdown of results processing (total 19834) Time spent populating nested members: 18198 Time spent searching ldb while populating nested members: 15424 Time spent saving nested members: 1529 Time spent writing to the ldb: 1 ms
In my opinon these measurements show that there is not much value in mounting the cache in tmpfs over mounting it in the async mode. The most time SSSD spends during processing of many large requests is parsing the data from LDAP and searching the cache.
resolution: => fixed status: new => closed
Metadata Update from @jhrozek: - Issue set to the milestone: SSSD 1.14.3
SSSD is moving from Pagure to Github. This means that new issues and pull requests will be accepted only in SSSD's github repository.
This issue has been cloned to Github and is available here: - https://github.com/SSSD/sssd/issues/4130
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