使用pyev的epool还是从Python中的stdlib中选择?
有人通过Python stdlib中的使用pyev的epool还是从Python中的stdlib中选择?,python,gevent,libevent,libev,Python,Gevent,Libevent,Libev,有人通过Python stdlib中的select,在Python中衡量pyev相对于标准绑定的速度和有用性吗 在选择上使用pyev有什么好处 pyev是通过C扩展构建的,所以它不是可移植的解决方案。我尝试用PyPy构建它,但开箱即用没有成功。 所以我只是想知道它是否值得使用 我知道gevent在其1.0版本中使用libev(在使用libevent之前)。他们真的需要吗? 我不关心非事件循环功能(如libevent中的dns)。Python的select模块只是select()、poll()和e
select
,在Python中衡量pyev相对于标准绑定的速度和有用性吗
在选择上使用pyev有什么好处
pyev是通过C扩展构建的,所以它不是可移植的解决方案。我尝试用PyPy构建它,但开箱即用没有成功。
所以我只是想知道它是否值得使用
我知道gevent在其1.0版本中使用libev(在使用libevent之前)。他们真的需要吗?
我不关心非事件循环功能(如libevent中的dns)。Python的select模块只是select()、poll()和epoll()系统调用的包装器,而libev和libevent实现了事件循环。事件循环管理观察器和计时器、排队等待事件、调用回调等
如果要将libev/libevent与Python进行比较,需要将它们与twisted的reactor和tornado的IOLoop进行比较
发件人:
下面是关于ev_run所做工作的血淋淋的细节(这是为了你的理解,不能保证事情会像这样工作
在未来版本中):
- Increment loop depth.
- Reset the ev_break status.
- Before the first iteration, call any pending watchers.
LOOP:
- If EVFLAG_FORKCHECK was used, check for a fork.
- If a fork was detected (by any means), queue and call all fork watchers.
- Queue and call all prepare watchers.
- If ev_break was called, goto FINISH.
- If we have been forked, detach and recreate the kernel state
as to not disturb the other process.
- Update the kernel state with all outstanding changes.
- Update the "event loop time" (ev_now ()).
- Calculate for how long to sleep or block, if at all
(active idle watchers, EVRUN_NOWAIT or not having
any active watchers at all will result in not sleeping).
- Sleep if the I/O and timer collect interval say so.
- Increment loop iteration counter.
- Block the process, waiting for any events.
- Queue all outstanding I/O (fd) events.
- Update the "event loop time" (ev_now ()), and do time jump adjustments.
- Queue all expired timers.
- Queue all expired periodics.
- Queue all idle watchers with priority higher than that of pending events.
- Queue all check watchers.
- Call all queued watchers in reverse order (i.e. check watchers first).
Signals and child watchers are implemented as I/O watchers, and will
be handled here by queueing them when their watcher gets executed.
- If ev_break has been called, or EVRUN_ONCE or EVRUN_NOWAIT
were used, or there are no active watchers, goto FINISH, otherwise
continue with step LOOP.
FINISH:
- Reset the ev_break status iff it was EVBREAK_ONE.
- Decrement the loop depth.
- Return.