From: "cs96and (Alan Davies) via ruby-core" <ruby-core@...>
Date: 2023-11-15T19:25:25+00:00
Subject: [ruby-core:115399] [Ruby master Bug#7968] Poor UDPSocket#send performance in ruby 2.0.0 on windows

Issue #7968 has been updated by cs96and (Alan Davies).


JesseJohnson (Jesse Johnson) wrote in #note-12:
> Can anyone replicate this on Ruby 3 or later?

Still poor performance in 3.1.3...

**1.9.3 send()**
```
$ ./ruby-1.9.3-p551-i386-mingw32/bin/ruby.exe --version
ruby 1.9.3p551 (2014-11-13) [i386-mingw32]

$ time ./ruby-1.9.3-p551-i386-mingw32/bin/ruby.exe d:/socketsendtest.rb

real    0m1.086s
user    0m0.000s
sys     0m0.000s
```
**1.9.3 print()**
```
$ time ./ruby-1.9.3-p551-i386-mingw32/bin/ruby.exe d:/socketsendtest.rb

real    0m1.108s
user    0m0.000s
sys     0m0.000s
```

**3.1.3 send()**
```
$ /c/tools/ruby31/bin/ruby --version
ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x64-mingw-ucrt]

$ time /c/tools/ruby31/bin/ruby d:/socketsendtest.rb

real    0m1.927s
user    0m0.000s
sys     0m0.015s
```

**3.1.3 print()**
```
$ time /c/tools/ruby31/bin/ruby d:/socketsendtest.rb

real    0m1.273s
user    0m0.000s
sys     0m0.015s
```

I also tried 3.2.2, however it runs incredibly quickly, and looking in Wireshark, I cannot see it actually generating any traffic.

----------------------------------------
Bug #7968: Poor UDPSocket#send performance in ruby 2.0.0 on windows
https://bugs.ruby-lang.org/issues/7968#change-105336

* Author: cs96and (Alan Davies)
* Status: Assigned
* Priority: Normal
* Assignee: windows
* ruby -v: ruby 2.0.0p0 (2013-02-24) [x64-mingw32]
----------------------------------------
I have noticed that the performance of UDPSocket#send on ruby 2.0.0 on windows is much poorer than that of 1.9.3 or 1.8.7.  Running the attahced script on 2.0.0 gives the following...

d:\scripts>bash -c "ruby --version"
ruby 2.0.0p0 (2013-02-24) [x64-mingw32]

d:\scripts>bash -c "time ruby socketsendtest.rb"

real    0m2.572s
user    0m0.000s
sys     0m0.016s

However, running the same test with 1.9.3 is much faster...

d:\scripts>pik 193

d:\scripts>bash -c "ruby --version"
ruby 1.9.3p374 (2013-01-15) [i386-mingw32]

d:\scripts>bash -c "time ruby socketsendtest.rb"

real    0m0.993s
user    0m0.015s
sys     0m0.016s

Additionally, if I change the send call to a print (commented out in the script), then the performance is fine on 2.0.0....

d:\scripts>pik 200

d:\scripts>bash -c "ruby --version"
ruby 2.0.0p0 (2013-02-24) [x64-mingw32]

d:\scripts>bash -c "time ruby socketsendtest.rb"

real    0m0.907s
user    0m0.000s
sys     0m0.015s

What is send() doing that print() doesn't do that is causing the massive performance drop?

Thanks
Alan.

---Files--------------------------------
socketsendtest.rb (266 Bytes)


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