Error on Win32

[KingOfGerrit]

I have that error on Windows 10 x64 with aria2c.exe x32:
[WARN] [SelectEventPoll.cc:235] The number of file descriptor exceeded FD_SETSIZE. Download may slow down or fail.
How fix this error?

[tatsuhiro-t]

Do you have lots of concurrent downloads? It looks like the aria2 process ran out of file descriptor (sockets + opened file), which is capped by 1024. Try to reduce the number of downloads.

[KingOfGerrit]

Yes, I have lots of concurrent downloads because I test aria2 with a lots of downloads. Can you fix this problem in next vesion?

[tatsuhiro-t]

The next version, v1.24.0 is released today, and we'd like to avoid last minutes change.

If you can build aria2, try increase value of FD_SETSIZE macro:

aria2/src/common.h

Line 61 in 09e7cfc

#define FD_SETSIZE 1024

[KingOfGerrit]

Can you do auto select of value?

[tatsuhiro-t]

Based on what?

FD_SETSIZE is compile time constant. You cannot change it in runtime.

[KingOfGerrit]

I read that for Windows fd_setsize can be changed and more then 1024 but for Linux hardcore 1024.
How compile aria2 for windows?

[tatsuhiro-t]

We use epoll for Linux, which is not limited by 1024 file descriptor.

We have Dockerfile.mingw to compile windows binary. It clones master branch, so you have to change it to your copy to include the change.

[KingOfGerrit]

Okey. Thanks.
Have any idea how to behave aria2 if I shall increase FD_SETSIZE?

[tatsuhiro-t]

I made a commit to increase FD_SETSIZE to 32768.
Now you can build aria2c windows binary using our stock Dockerfile.mingw.
Please test the build and see that it does not show the error message you encountered before.

[KingOfGerrit]

Okay.
In the near future results.

[KingOfGerrit]

I tested aria 2 with FD_SETSIZE 32768, and after 2 days work with 20 torrents all okay. No have any error.

[tatsuhiro-t]

Thank you. I think this issue has been fixed.