[rabbitmq-discuss] 3.2.2 triple mem
simon at rabbitmq.com
Wed Feb 19 10:30:19 GMT 2014
On 19/02/14 09:25, der.hans wrote:
> Is there a known reason for 3.2.2 to use 3x the memory used by 3.1.5 for
> the same load?
Possibly. 3.1.x and earlier would page messages to disk if memory use
went above 20% of the vm_memory_high_watermark (i.e. if > 8% memory was
used with the default watermark).
3.2.x made this setting configurable (as
vm_memory_high_watermark_paging_ratio) and also changed the default
value for it from 20% to 50%, so it will start paging once > 20% memory
See http://www.rabbitmq.com/memory.html#memsup-paging for information on
In general the default values for vm_memory_high_watermark and
vm_memory_high_watermark_paging_ratio are set on the assumption that
RabbitMQ is the only significant thing running on the machine, and thus
that it's reasonable for it to use all available memory if it will make
things go faster.
More information about the rabbitmq-discuss