Date: Mon, 23 Feb 1998 15:12:07 -0800 From: Iyer Mahadevan <iyer@internetdevices.com> To: iyer@internetdevices.com, java@FreeBSD.ORG, freebsd-java@FreeBSD.ORG, java-port@FreeBSD.ORG, saurabh@internetdevices.com Subject: IO Performace problems using Java Sockets on FreeBSD Message-ID: <34F20247.DCFAF718@internetdevices.com>
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Iyer Mahadevan wrote:
> There were some problems with the formatting on my previous mail.
> So I am sending the mail again
>
> 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
>
> R1 = Time request read by server - Time request sent by client
> R2 = Time reply read by client - Time reply sent by server
> Total = Time received reply - Time connected to server
>
> 133 MH 64 MB
> FreeBSD 2.2-STABLE
> -----------------
>
> Server Client R1 R2 Total
>
> C C 194 2 200
> Java C - - 400
> Java Java 191 199 400
>
> ===========================
>
> 70 MH 64 MB
> SunOS Release 5.4
> --------------
>
> Server Client R1 R2 Total
>
> 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
>
> When compared to the Solaris numbers ........
>
> 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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Date: Mon, 23 Feb 1998 15:06:59 -0800
From: Iyer Mahadevan <iyer@internetdevices.com>
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Subject: Socket IO Performance
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There were some problems with the formatting on my previous mail.
So I am sending the mail again
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
R1 = Time request read by server - Time request sent by client
R2 = Time reply read by client - Time reply sent by server
Total = Time received reply - Time connected to server
133 MH 64 MB
FreeBSD 2.2-STABLE
-----------------
Server Client R1 R2 Total
C C 194 2 200
Java C - - 400
Java Java 191 199 400
===========================
70 MH 64 MB
SunOS Release 5.4
--------------
Server Client R1 R2 Total
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
When compared to the Solaris numbers ........
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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