Date: Mon, 23 Feb 1998 14:26:01 -0800 From: Iyer Mahadevan <iyer@internetdevices.com> To: java@FreeBSD.ORG, iyer@internetdevices.com, saurabh@internetdevices.com, freebsd-java@FreeBSD.ORG, java-port@FreeBSD.ORG Subject: Socket IO problems using Java Sockets on FreeBSD Message-ID: <34F1F777.BEC2F180@internetdevices.com>
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I noticed some serious performance problems with Java Socket I/O.
I set up en echo server that echoes the request back to the client.
I found that there were serious performance problems when data was being
written to the socket and read at the other end
133 MH 64 MB
FreeBSD 2.2-STABLE
Request read time = Time request read by server - Time request sent by
client
Reply read time = Time reply read by client - Time reply sent by
server
Total time = Time received reply - Time connected to server
Server Client Request read
time Reply read time Total Time
C C
194 2 200
Java
C
400
Java Java
191 199 400
Next I decided to take a look at the corresponding performance on a
Sparc 4
70 MH 64 MB
SunOS Release 5.4
Server Client Request read
time Reply read time Total Time
C C
41 49 98
Java
C
103
Java Java
44 46 111
Note:
1. I took 5 samples for each case
2. Both client and server were running on the same machine (used
localhost to connect)
Questions
1. Do you understand why the socket I/O is twice as expensive on FreeBSD
for
(C Server - C Client)
2. Do you understand why the socket I/O is 4 times as expensive on
FreeBSD for
(Java Server - C Client)
PS : Let me know if you need any code, any generic Java/C socket code
should do
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