[rabbitmq-discuss] RabbitMQ-C library: channel_max
simon at rabbitmq.com
Wed Oct 26 10:28:32 BST 2011
On 25/10/11 23:25, Pieter de Zwart wrote:
> Dumb question alert, sorry. In the rabbitmq-c library, there are a few
> parameters to the amqp_login function that confuse me: channel_max and
> frame_max. Are these essentially the global QOS settings (how many
> channels can be on this connection, 0 being unlimited AND maximum window
> frame size, within which the client will try to tune the connection)?
No, not at all.
frame_max is the maximum AMQP frame size the client should accept when
negotiating a frame size with the server. Zero is unlimited.
channel_max is the maximum number of channels per connection that the
client will use. Zero is unlimited.
RabbitMQ really doesn't care much about this, but conceivably other
server implementations might require your client to agree to a low value.
> What are legitimate values for these? Should I expose them in the PHP
> extension, and allow people to change them prior to connecting?
Depends how completist you feel. Tuning frame_max can make differences
to throughput in some situations. channel_max is not very interesting
when connecting to RabbitMQ.
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