How many cores does (an older) RabbitMQ use #8510
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Hi, we have an older RabbitMQ 3.3.1 connected application, with Erlang 17. I see maximum CPU usage clamping at about 25%, which suggests me that it's using one of 4 vcpus to the max. |
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Replies: 2 comments 1 reply
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Hello, thanks for using RabbitMQ. Obviously, the version of RabbitMQ and Erlang you're using are extremely out-of-date. How many queues are you using? |
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Around 10 durable ones, and as much auto delete. |
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Just like 3.12, RabbitMQ 3.3 will use a single core for every queue replica. So if you see a node only use one core, then either your workload is dominated by a single very busy queue, or the process is limited (e.g. using cgroups) to use just one core, or the runtime hasn't detected the CPU topology correctly (I highly doubt it). |
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Just like 3.12, RabbitMQ 3.3 will use a single core for every queue replica. So if you see a node only use one core, then either your workload is dominated by a single very busy queue, or the process is limited (e.g. using cgroups) to use just one core, or the runtime hasn't detected the CPU topology correctly (I highly doubt it).