I'm trying to determine how to correctly use cProfile and pstats with asyncio code. I am profiling my script by running cProfile.run('loop.run_until_complete(main())', 'profile.stats'). After usi...

I'm doing some event handling with C++ and pthreads. I have a main thread that reads from event queue I defined, and a worker thread that fills the event queue. The queue is of course thread safe. ...

when using epoll_ctl(), I found that the third parameter "fd" is another file descriptor besides the epoll file descriptor "epfd". And I saw an example like this: event.data.fd = sfd; //sfd is a f...

We all know that using asyncio substantially improves the performance of a socket server, and obviously things get even more awesome if we could take advantage of all cores in our cpu (maybe via mu...

I am creating a multithreaded server using epoll (edge-triggered) and non-blocking sockets. Currently I'm creating an event loop on the main thread and waiting for notifications and it works correc...

I try to rebuild an electron app but I got this error regarding the epoll installation. Building module: epoll, Completed: 0gyp: name 'openssl_fips' is not defined while evaluating condition 'opens...

Registering a level triggered eventfd on epoll_ctl only fires once, when not decrementing the eventfd counter. To summarize the problem, I have observed that the epoll flags (EPOLLET, EPOLLONESHOT ...

Wikipedia says unlike the older system calls, which operate at O(n), epoll operates in O(1) [2]). http://en.wikipedia.org/wiki/Epoll However, the source code at fs/eventpoll.c on Linux-2.6...

I'm trying to learn how to use epoll() for TCP server application, because I'm expecting many connections. I tried checking samples and tutorials, they always recommend using/setting sockets ...

From epoll's man page: epoll is a variant of poll(2) that can be used either as an edge-triggered or a level-triggered interface When would one use the edge triggered option? The man page gives ...

I'm migrating my project to io_uring for better performance. However, some part of the system depends on epoll being event system and not movable to io_uring (ex: database drivers, they write to so...

I'm on a laptop with 2 connected keyboards (built-in and USB). I'm obtaining these connected keyboards with libudev and using epoll to poll them for input via the evdev interface: // Compile with $...

I'm writing my own echo server using sockets and syscalls. I am using epoll to work with many different clients at the same time and all the operations done with clients are nonblocking. When the s...

I am trying to understand how to use the epoll library (Linux) in combination with socket file descriptors. There is limited information about epoll available online as far as I can tell. So far th...

According to the linux man page, EPOLLHUP When reading from a channel such as a pipe or a stream socket, this event merely indicates that the peer closed its end of the channel. E...

I am trying to figure out what is more performant, edge triggered or level triggered epoll. Mainly I am considering "performant" as: Ability to handle multiple connections without degred...

My application is a web version of the board game Settlers of Catan. I'm using node --prof app.js to profile the app and node --prof-process ISOLATE_LOG_FILE > processed.txt to turn them into a...

I am developing a node-js application that expects midi input and sends midi output. In order to measure and improve the performance of the application, following this guide, I have extracted the C...

There are two functions in epoll: epoll_ctl epoll_wait Are they thread-safe when I use the same epoll_fd? What will happen if one thread calls epoll_wait and others call epoll_ctl at the same t...

I'm developing a server in C with the epoll library and I have a question as to how memory is handled for struct epoll_event. I've noticed in some online examples that, when making epoll_ctl calls,...

I want to create a non-blocking connect. Like this: socket.connect(); // returns immediately For this, I use another thread, an infinite loop and Linux epoll. Like this(pseudocode): // in anoth...

I'm currently writing a multi-threaded server where each thread has an io_context and a list of task objects to execute, with each task object having an associated ip::tcp::socket object. For load...

Event-driven and asynchronous are often used as synonyms. Are there any differences between the two? Also, what is the difference between epoll and aio? How do they fit together? Lastly, I've rea...

Thaks for guys in previous answer, now I can build a multi process TCP server with each process running a asynchronous server respectively but all binding to one port. (Could not use os.fork() bind...

According to the poll man page, the poll function can return POLLHUP and POLLRDHUP events. From what I understand, only POLLHUP is POSIX compliant, and POLLRDHUP is a Linux non-standard extension. ...