Sorry, something went wrong. I know, this issue is very broad. There are multiple possible reasons as to why Cygwin could be slow. The stat issue is also something I didn't hear about before. For now, this repository seems to allow performance-related issues only. So I just made this issue about performance. Such workarounds often end up in bad performance, as seen on Cygwin.
Yes, but it's still just a glorified VM. It doesn't help in the example of FFmpeg, unless you cross-compile to Windows. But there are problems with that I could go into details. For other types of programs, this isn't feasible, because they need access to windows APIs. It's not just for GNU tools. If carefully written, an application that didn't even attempt to target Cygwin, will build and run just fine on Cygwin. Even git for windows appears to use Cygwin, even though it's not a GNU tool.
I didn't look too closely though. I've only seen the dev folder, which seems to be an artifact of Cygwin going a bit too far to pretend to be Unix. However, Cygwin does not run unmodified Linux binaries and so you cannot "apt install No, that isn't Cygwin's goal. However, Cygwin has its own repository of pre-built binaries, which surely made a lot of people happy.
I mean, that's certainly true, but on the other hand there are a lot of staggering similarities. At least on Linux, FDs are used whenever userspace needs a handle to a kernel object. There are many types of FDs that are not associated with any kind of byte stream consider device files, memfd, epoll, signalfd, pidfd, listener-only sockets. Portable programs can mostly just use open instead of CreateFile. They're their own thing, and it's awful. So awful.
Sorry, I guess that got quite offtopic wrt. Though going through these layers will also cost performance, and they require making a lot of choices that might impact performance. A nice example which I've seen in libusb: they use win32 "events" to emulate wakeup pipes.
Their central mainloop is a poll call, which waits on all wakeup pipes. But unlike poll, WaitForMultipleObjects has a limit on the number of objects it can wait on. So they start an additional thread for every 64 objects, and at the end of the wait, they destroy the threads.
Every time. That doesn't seem to be ideal. This probably affects native windows programs as well. Listing directory contents isn't the only purpose of stat.
Often, you may want to run it on a single file, or on a separate list of files maybe "git status"? I use Avast antivirus. Cygwin is excruciatingly slow to do any operation.
Disabling the Avast shield makes Cygwin very fast. In my case, I had a really poor performing PS1 custom prompt variable set. Once I removed it, everything was really fast. Show 5 more comments. Add a comment. I can't find the cygwin installer. That is not a Cygwin setting, but rather a Windows setting — Demi. Right on. Thanks man, been looking for a while for a solution to slow directory changes on network UNC paths.
By disabling it, the time of the script in the question falls back to: real 0m0. This still much slower than Linux, but gets the same "real time" of other cygwin computers. Thank you all! How did you determine this?
I looked for the service, but don't see it and I'm having the same issue. I checked that every item in my path was a valid directory. Desmond Campbell Desmond Campbell 21 1 1 bronze badge. Teresa e Junior Teresa e Junior 1, 2 2 gold badges 16 16 silver badges 27 27 bronze badges.
Let's put some numbers to it. Hello Hello real 0m0. Jared Jared 1, 3 3 gold badges 19 19 silver badges 43 43 bronze badges.
OK, something is definitely wrong with your setup if it's taking ms to execute a single echo. Did you try it in xterm? You have to download the X packages too to get that. By the way, the slow behaviour also showed itself with the Windows command prompt and portable applications.
Some portable applications took several hours to produce a window when started. Python Javascript Linux Cheat sheet Contact. Simply run cygserver on login. Do you want to install cygserver as service?
Please read the inline information in that file carefully. The best option for the start is to just leave it alone. Basic Cygserver configuration finished.
It turns out this is easy to do. To set this up properly, run cygserver-config once only. This will set up cygserver to run as a Windows service with the correct credentials. Do this from an administrator Cygwin window. Have a look at the documentation over at the Cygwin site. Basically it does the user caching stuff, together with ensuring IPC works between all Cygwin processes.
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