STAP: Only print transaction statistics if the script caught some transactions If the script measured an 'id' run from the cache, there would be no transactions and dereferencing the aggrefate would throw an error. Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

CONTRIB: Add a systemtap script to analyze the performance of the 'id' command Run this script using "stap" as root: sudo stap /path/to/sssd/contrib/systemtap/id_perf.stp It is not required to restart the script between successive id runs, the variables are cleared when systemtap detects id had started or finished. You should see output as this one: Total run time of id was: 112 ms Number of zero-level cache transactions: 9 Time spent in level-0 sysdb transactions: 84 ms Time spent writing to LDB: 80 ms Number of LDAP searches: 13 Time spent waiting for LDAP: 11 ms LDAP searches breakdown: Number of user requests: 1 Time spent in user requests: 15 Number of group requests: 6 Time spent in group requests: 71 Number of initgroups requests: 1 Time spent in initgroups requests: 20 Unaccounted time: 17 ms sysdb transaction breakdown: 1 hits of transaction sysdb_transaction_commit+0x6b [libsss_util.so] sdap_save_users+0x2d2 [libsss_ldap_common.so] sdap_get_users_done+0x186 [libsss_ldap_common.so] sdap_search_user_process+0x2d9 [libsss_ldap_common.so] generic_ext_search_handler+0x22f [libsss_ldap_common.so] sdap_get_and_parse_generic_done+0x6f [libsss_ldap_common.so] sdap_get_generic_op_finished+0x806 [libsss_ldap_common.so] sdap_process_message+0x3c4 [libsss_ldap_common.so] sdap_process_result+0x33a [libsss_ldap_common.so] sdap_ldap_next_result+0x2f [libsss_ avg:14 min: 14 max: 14 sum: 14 5 hits of transaction sysdb_transaction_commit+0x6b [libsss_util.so] sdap_nested_done+0x2c8 [libsss_ldap_common.so] sdap_nested_group_done+0x9b [libsss_ldap_common.so] 0x7f47a6320be4 [libtevent.so.0.9.26+0x4be4] avg:9 min: 9 max: 11 sum: 49 1 hits of transaction sysdb_transaction_commit+0x6b [libsss_util.so] sdap_nested_done+0x2c8 [libsss_ldap_common.so] sdap_nested_group_done+0x9b [libsss_ldap_common.so] sdap_nested_group_process_done+0x1dc [libsss_ldap_common.so] sdap_nested_group_single_done+0x112 [libsss_ldap_common.so] sdap_nested_group_recurse_done+0x95 [libsss_ldap_common.so] 0x7f47a6320be4 [libtevent.so.0.9.26+0x4be4] avg:11 min: 11 max: 11 sum: 11 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>