Hello!
Just decided to run "perf top" on a web server which seemed to be
CPU-bound and saw this at the top:
samples pcnt function DSO
_______ _____ ________________________ __________________
5261.00 11.9% rpcauth_lookup_credcache [kernel.kallsyms]
2429.00 5.5% lex_scan php4
2184.00 5.0% thread_group_cputime [kernel.kallsyms]
1505.00 3.4% established_get_next [kernel.kallsyms]
1083.00 2.5% zendparse php4
1055.00 2.4% zend_hash_find php4
958.00 2.2% lex_scan php5
905.00 2.1% execute php4
890.00 2.0% memcpy /lib/libc-2.7.so
I see this just became configurable, but probably 4 bits (16 buckets?) is
probably a bit small for the default, no? (hlist_head is just a pointer,
4 or 8 bytes per bucket, so the default is 128 bytes on x64 :))
I guess it really needs to auto-scale...
Simon-