Sun Java System Web Server 7.0 Update 3 Performance Tuning, Sizing, and Scaling Guide

Using Performance Buckets

Performance buckets allow you to define buckets and link them to various server functions. Every time one of these functions is invoked, the server collects statistical data and adds it to the bucket. For example, send-cgi and service-j2ee are functions used to serve the CGI and Java servlet requests respectively. You can either define two buckets to maintain separate counters for CGI and servlet requests, or create one bucket that counts requests for both types of dynamic content. The cost of collecting this information is minimal, and the impact on the server performance is usually negligible. This information can later be accessed using perfdump. The following information is stored in a bucket:


You must specify all configuration information for performance buckets in the magnus.conf and obj.conf files. Only the default-bucket is automatically enabled.

First, you must enable performance statistics collection and perfdump.

The following examples show how to define new buckets in magnus.conf:

Init fn="define-perf-bucket" name="acl-bucket" description="ACL bucket"

Init fn="define-perf-bucket" name="file-bucket" description="Non-cached responses"

Init fn="define-perf-bucket" name="cgi-bucket" description="CGI Stats"

The previous examples create three buckets: acl-bucket, file-bucket, and cgi-bucket. To associate these buckets with functions, add bucket=bucket-name to the obj.conf function for which to measure performance.


PathCheck fn="check-acl" acl="default" bucket="acl-bucket"
Service method="(GET|HEAD|POST)" type="*~magnus-internal/*" 
fn="send-file" bucket="file-bucket"
<Object name="cgi">
ObjectType fn="force-type" type="magnus-internal/cgi"
Service fn="send-cgi" bucket="cgi-bucket"

For more information, see The bucket Parameter in Sun Java System Web Server 7.0 Update 3 Administrator’s Configuration File Reference.

Performance Report

The server statistics in buckets can be accessed using perfdump. The performance buckets information is located in the last section of the report returned by perfdump.

The report contains the following information:

The following is an example of the performance bucket information available through perfdump:

Performance Counters:
                           Average         Total      Percent

Total number of requests:               62647125
Request processing time:    0.0343  2147687.2500

default-bucket (Default bucket)
Number of Requests:                     62647125    (100.00%)
Number of Invocations:                3374170785    (100.00%)
Latency:                    0.0008    47998.2500    (  2.23%)
Function Processing Time:   0.0335  2099689.0000    ( 97.77%)
Total Response Time:        0.0343  2147687.2500    (100.00%)