On 21 Feb 2008, at 19:52, Ben Chobot wrote:
It sounds like you don't have a very firm grasp on what's going on,
under the covers. If you need persistence, have you tried pulling
the power cord from your server and verifying you haven't lost
messages? If you don't care, why do you need persistence? :)
I suspect that what might be happening is that your writes are going
very fast because they're going into a write buffer somewhere along
the line. Your reads are not going so fast, because what you're
trying to read has left the buffer and now has to come off disk, and
your disk isn't very fast.
zaoliu wrote:
I have no idea about the IO systems. The server is using Linux
Operating
System and has 6 cpus. I find that the speed is getting lower and
lower
with time. When produce 500000 messages, the speed is 3500/s. But
when
consumer 700000 messages, the speed get down to avg 1700/s. I
think I need
to run the test for longer time to get a fair result. When
consuming the
messages from the server, the speed is getting down much faster. Is
50 msg/s
in normal condition?
Ben Chobot wrote:
What is the underlying I/O system like for your broker? As I
understand the persistence layer for ActiveMQ, 3,500 durable
messages a second sounds too good to be true, assuming you're
writing them safely.
Writes are usually fast because of the journaling part of the default
message store
Which version are you using btw?
cheers,
Rob
