celery变量共享
问题
很多情况下我们想让task共享变量,该怎么做?
celery的并发原理
celery的并发任务池,有eventlet, gevent, prefork, thread类型
eventlet/gevent协程: 只有一个进程一个线程, 全局变量在task之间共享
prefork属于multiprocessing: multiprocessing全局变量也是共享的
thread多线程: 全局变量共享
验证方法
用ab命令模拟大量并发,很容易测试出来
ab -n 1000 -c 100 -p ./post.txt -T application/json http://xxxx:5000/xxx
结论
1. celery如果访问数据库, gpu等资源, 不用担心多次加载
2. 注意: 如果在task中初始化全局变量, 初始化较慢, 同时又收到大量task请求,可能会导致初始化多次
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