IBM WEBSPHERE 6.1.X Manual do Utilizador descarregar pdf (Página 61)

WE BSPHERE PORTAL V6.1 TUNING GUIDE

Real-World Network Considerations

In our lab environment, we had the luxury of our clients and servers being on the same LAN

segment, so that they could take advantage of a high-bandwidth, low-latency network

connection. However, this is typically not the case for real clients. Over a wide-area network,

latencies can be significant, and bandwidth limited. In this case, the time to transfer the page

content from the server to the client can become a significant contributor to overall page

response time.

Here are some steps which can help alleviate this situation:

•

Compress content on the HTTP server

•

Allow client-side caching of images, Javascript files, and stylesheets,

Details on these steps will be given below.

C O M P R E S S C O N T E N T O N T H E H T T P S E R V E R

Much of the content served by a WebSphere Portal site can be compressed to reduce

transmission time and save network bandwidth. Typically, images should not be

compressed (as they are usually stored in a compressed format), but other types of content

can show a significant size reduction from compression.

IBM HTTP Server supports Deflate compression through the mod_deflate module. When

it is enabled, the HTTP server checks the Accept-Encoding: header sent by the browser

to see if it can accept a compressed version of the content. If so, the HTTP server will

compress the content before sending it to the browser.

In one measurement, we observed an average of 65% network traffic reduction when

Deflate compression is enabled. However, the compression operation does not come free

as we also observed approximately a 10% processor utilization increase on the HTTP

server.

To enable deflate compression in IBM HTTP Server, add the following lines in

httpd.conf:

# compress everything but images

LoadModule deflate_module modules/mod_deflate.so

DeflateFilterNote Input instream

DeflateFilterNote Output outstream

DeflateFilterNote Ratio ratio

# Insert filter

SetOutputFilter DEFLATE

# Netscape 4.x has some problems...

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 96 97

ChrisCaddy 27 Apr 2024 | 05:14:13

Hello, im noob :)

IBM WEBSPHERE 6.1.X Manual do Utilizador Página 61