On 06/22/2011 01:22 PM, Zhemzhitsky Sergey wrote:
Hi there,
I'm using qpid 0.8 and I'm trying to configure queue to use the limit-policy
parameter without luck.
Here is the command to create a queue
qpid-config add queue myQueue --durable --file-size=256 --file-count=96
--max-queue-count=100 --limit-policy=flow-to-disk
Here is output of the top command after qpid starts
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28146 qpidd 19 0 123m 5596 4104 S 0.0 0.3 0:00.00 qpidd
As you can see it uses ~5.6mb of memory.
After I start to send non-persistent messages (size of each message is 32
bytes) without consumption the output of the top command is the following:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28146 qpidd 16 0 2541m 1.8g 3520 S 49.0 94.1 0:41.75 qpidd
Now qpid consumes 1.8Gb and it continues to consume more.
I'm wondering why so? How to make the queue to use the limit-policy parameter
correctly?
That policy allows the body of the message to be released from memory,
but the headers etc will still be held in memory. For small messages
(such as the 32 byte message you are sending), this policy will not
really do anything useful.
Your use case really requires a proper paging solution which qpidd does
not yet support.
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