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about the advantages of caching metainformation...

From: Yves Lafon <ylafon@w3.org>
Date: Fri, 3 Mar 2000 15:02:11 +0100 (MET)
To: www-jigsaw@w3.org
Message-ID: <Pine.GSO.4.21.0003031445450.23120-100000@tarantula.inria.fr>
I just installed apache 1.3.12 to do some basic tests.

The configuration is the following:
1/ Apache - compiled using gcc2.95.2

   1.3.12, bare configuration, with just two modification:
   Port 8000, and ContentDigest on, to give the Content-MD5 
   header.

   HEAD /Distrib/jigsaw_2.0.4.zip HTTP/1.1
   Host: tarantula.inria.fr:8000

   HTTP/1.1 200 OK
   Date: Fri, 03 Mar 2000 13:49:12 GMT
   Server: Apache/1.3.12 (Unix)
   Last-Modified: Fri, 21 Jan 2000 17:21:36 GMT
   ETag: "1fd26-63c0ef-388895a0"
   Accept-Ranges: bytes
   Content-Length: 6537455
   Content-MD5: BnTW0ZfYueUDCY1U67jtdg==
   Content-Type: application/zip

2/ Jigsaw 2.1.0

   Running using jdk1.2.2_05.
   The configuration is not fair for Jigsaw, it has virtual hosts
   3 servers running (including one experimental 2.1 cache)...

   HEAD /Distrib/jigsaw_2.0.4.zip HTTP/1.1
   Host: tarantula.inria.fr:8007

   HTTP/1.1 200 OK
   Cache-Control: max-age=432000
   Date: Fri, 03 Mar 2000 13:48:34 GMT
   Content-Length: 6537455
   Content-Md5: BnTW0ZfYueUDCY1U67jtdg==
   Content-Type: application/zip
   Etag: "1vtq0oq:rjaogu80"
   Expires: Wed, 08 Mar 2000 13:48:34 GMT
   Last-Modified: Fri, 03 Mar 2000 13:24:38 GMT
   Server: Jigsaw/2.1.0

The test client is ptester, from the phttpd distribution, still 1.0 but
the test is not about HTTP/1.0 / 1.1 but about caching meta information ;)
So, we are asking as many time as possible the /Distrib/jigsaw_2.0.4.zip
file, the test runs for 2 minutes, with 5 concurrent clients.
Here are the results:

1: Apache
ptester -t120 -h138.96.10.3 -p8000 /Distrib/jigsaw_2.0.4.zip
    /Distrib/jigsaw_2.0.4.zip /Distrib/jigsaw_2.0.4.zip
    /Distrib/jigsaw_2.0.4.zip /Distrib/jigsaw_2.0.4.zip

URL                  NRq  Min Ct Avg Ct Max Ct  Min Tx Avg Tx Max Tx
Bytes
/Distrib/jigsaw_2.0.4.zip   15  0.0002 0.0003 0.0006  7.2549 8.2440 9.4845 6537754
/Distrib/jigsaw_2.0.4.zip   15  0.0002 0.0003 0.0009  6.8569 8.2588 9.2060 6537754
/Distrib/jigsaw_2.0.4.zip   15  0.0002 0.0003 0.0017  7.2966 8.2644 9.5115 6537754
/Distrib/jigsaw_2.0.4.zip   15  0.0002 0.0002 0.0006  7.5706 8.2792 9.8478 6537754
/Distrib/jigsaw_2.0.4.zip   16  0.0002 0.0003 0.0006  4.7803 7.8056 8.7447 6537754

Actual test time.. 125 seconds
Total requests.... 76 (0 requests/sec)
Total failed...... 0 (0 requests/sec)
Total bytes....... 496869304 (3974954 bytes/sec)

Min Tx: 4.7803
Max Tx: 9.8478

2: Jigsaw
ptester -t120 -h138.96.10.3 -p8007 /Distrib/jigsaw_2.0.4.zip
    /Distrib/jigsaw_2.0.4.zip /Distrib/jigsaw_2.0.4.zip
    /Distrib/jigsaw_2.0.4.zip /Distrib/jigsaw_2.0.4.zip
   
URL                  NRq  Min Ct Avg Ct Max Ct  Min Tx Avg Tx Max Tx
Bytes
/Distrib/jigsaw_2.0.4.zip   74  0.0002 0.0002 0.0007  0.7829 1.6449 2.8596 6537740
/Distrib/jigsaw_2.0.4.zip   81  0.0002 0.0002 0.0010  0.3938 1.5040 2.3876 6537740
/Distrib/jigsaw_2.0.4.zip   76  0.0002 0.0002 0.0007  0.6084 1.6051 2.3686 6537740
/Distrib/jigsaw_2.0.4.zip   80  0.0002 0.0002 0.0007  0.3588 1.5259 2.5286 6537740
/Distrib/jigsaw_2.0.4.zip   81  0.0002 0.0002 0.0007  0.4944 1.5087 2.7251 6537740

Actual test time.. 122 seconds
Total requests.... 392 (3 requests/sec)
Total failed...... 0 (0 requests/sec)
Total bytes....... -1732173216 (-14198141 bytes/sec)

Of course the test was run on the same machine as bandwidth was a
limitation (still 10Bt).
Why is Apache so slow? because it computes for every request the
content-md5 of the file before sending the reply.
It is just a proof that you can adapt easily a bench to be good to one
particular server (Hey, Jigsaw is 5 time faster than Apache! ;) ). 

      /\          - Yves Lafon - World Wide Web Consortium - 
  /\ /  \        Architecture Domain - Jigsaw Activity Leader
 /  \    \/\    
/    \   /  \   http://www.w3.org/People/Lafon - ylafon@w3.org    
Received on Friday, 3 March 2000 09:02:24 UTC

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