I use benchmarksql with more than 200 clients on pg 9.3.3. when the test is going on, I collect all the process stack. I found about 100 processes are blocked by btree insert. Another 100 are blocked by xloginsert.
Does btree has bad performance in concurrency scenarios? Sum:66 #0 0x00007f8273a77627 in semop () from /lib64/libc.so.6 #1 0x000000000060cda7 in PGSemaphoreLock () #2 0x00000000006511a9 in LWLockAcquire () #3 0x00000000004987f7 in _bt_relandgetbuf () #4 0x000000000049c116 in _bt_search () #5 0x0000000000497e13 in _bt_doinsert () #6 0x000000000049af52 in btinsert () #7 0x000000000072dce4 in FunctionCall6Coll () #8 0x000000000049592e in index_insert () #9 0x0000000000590ac5 in ExecInsertIndexTuples () Sum:36 #0 0x00007f8273a77627 in semop () from /lib64/libc.so.6 #1 0x000000000060cda7 in PGSemaphoreLock () #2 0x00000000006511a9 in LWLockAcquire () #3 0x0000000000497e31 in _bt_doinsert () #4 0x000000000049af52 in btinsert () #5 0x000000000072dce4 in FunctionCall6Coll () #6 0x000000000049592e in index_insert () #7 0x0000000000590ac5 in ExecInsertIndexTuples () -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
