RabbitMQ调优系列1 调整I/O线程线程池

 

RabbitMQ调优系列1 调整I/O线程线程池

Erlang runtime uses a pool of threads for performing I/O operations asynchronously. The size of the pool is configured via the RABBITMQ_IO_THREAD_POOL_SIZE environment variable. The variable is a shortcut to setting the +A VM command line flag, e.g. +A 128.
【Erlang 运行时使用一个线程池执行异步I/O操作。该线程池的大小通过RABBITMQ_IO_THREAD_POOL_SIZE 环境变量配置。该变量也可设置为 +A 的VM命令行快捷方式标志，例如+A 128。】

# reduces number of I/O threads from 128 to 32
RABBITMQ_IO_THREAD_POOL_SIZE=32

To set the flag directly, use the `RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS` environment variable:
【使用RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS环境变量可以直接设置该标志】

RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+A 128"

Default value in recent RabbitMQ releases is 128 (30 previously). Nodes that have 8 or more cores available are recommended to use values higher than 96, that is, 12 or more I/O threads for every core available. Note that higher values do not necessarily mean better throughput or lower CPU burn due to waiting on I/O.
【该变量的默认值从早期版本的30个线程，增加到128个线程。建议具有8个或更多可用内核的节点服务器使用大于96个线程的值，即每个可用内核使用12个或更多I/O线程。请注意，较高的值并不一定意味着由于等待I/O而带来更好的吞吐量或更低的CPU消耗。】