From: "cs96and (Alan Davies)" <alan.n.davies@...>
Date: 2013-03-10T03:40:34+09:00
Subject: [ruby-core:53270] [ruby-trunk - Bug #7968] Poor UDPSocket#send performance in ruby 2.0.0 on windows


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


The bind and connect can be different.  The bind specifies what port you are sending from, and connect specifies the port you are sending to (the ip address can be a different box too).  It runs fine for me with different ports, but you can make them the same if you want.
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Bug #7968: Poor UDPSocket#send performance in ruby 2.0.0 on windows
https://bugs.ruby-lang.org/issues/7968#change-37444

Author: cs96and (Alan Davies)
Status: Open
Priority: Normal
Assignee: cruby-windows
Category: platform/windows
Target version: 
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.


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