2 Commits

Author	SHA1	Message	Date
Volker Lendecke	9af73f62ce	lib: Add lib/util/server_id.h ... Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>	2017-01-22 18:30:11 +01:00
Volker Lendecke	4288c5496b	messaging3: Add msg_sink/source -- perftest ... With this pair of programs I did some performance tests of the messaging system. Guess what -- I found two bugs :-) See the subsequent patches. With 1500 msg_source processes I can generate message overload: A Intel(R) Xeon(R) CPU L5640 @ 2.27GHz can receive roughly 100k messages per second. When using messaging_read_send/recv user/system time is roughly even, a bit more work done in user space. When using messaging_register, due to less malloc activity, user space chews a lot less. By the way: 1.500 helper threads in a blocking sendto() against a single datagram socket reading as fast as it can (with epoll_wait in between) only drove the loadavg to 12 on a 24-core machine. So I guess unix domain datagram sockets are pretty well protected against overload. No thundering herd or so. Interestingly "top" showed msg_sink at less than 90% CPU, although it was clearly the bottleneck. But that must be a "top" artifact. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>	2014-08-23 00:24:18 +02:00