Sun Microsystems Sun Java System Web Server 7.0, Manual

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Avoiding Directories in the Classpath
For certain applications (especially if the Java Security Manager is enabled) you can improve
performance by ensuring that there are no unneeded directories in the classpath. To do so,
change the Server Class Path, Class Path Prefix, and Class Path Suffix fields on the
configuration's Java tab
⇒
General sub tab for the configuration or use the command
wadm
set-jvm-prop
. Also, package the web application's
.class
files in a
.jar
archive in
WEB-INF/lib
instead of packaging the
.class
files as is in
WEB-INF/classes
, and ensure that
the
.war
archive does not contain a
WEB-INF/classes
directory.
Configuring the Web Application’s Session Settings
If you have relatively short-lived sessions, try decreasing the session timeout by configuring the
value of the
timeOutSeconds
property under the
session-properties
element in
sun-web.xml
from the default value of 10 minutes.
If you have relatively long-lived sessions, you can try decreasing the frequency at which the
session reaper runs by increasing the value of the
reapIntervalSeconds
property from the
default value of once every minute.
For more information about these settings, and about session managers, see Sun Java System
Web Server 7.0 Update 1 Developer’s Guide to Java Web Applications .
In multi-process mode when the
persistence-type
in
sun-web.xml
is configured to be either
s1ws60
or
mmap
, the session manager uses cross-process locks to ensure session data integrity.
These can be configured to improve performance as described below.
Note –
For Java technology-enabled servers, multi-process mode is deprecated and included for
backward-compatibility only.
Tuning maxLocks (UNIX/Linux)
The implication of the number specified in the
maxLocks
property can be gauged by dividing
the value of
maxSessions
with
maxLocks
. For example, if
maxSessions = 1000
and you set
maxLocks = 10
, then approximately 100 sessions (1000/10) contend for the same lock.
Increasing
maxLocks
reduces the number of sessions that contend for the same lock and might
improve performance and reduce latency. However, increasing the number of locks also
increases the number of open file descriptors, and reduces the number of available descriptors
that would otherwise be assigned to incoming connection requests.
For more information about these settings, see Chapter 6, “Session Managers,” in Sun Java
System Web Server 7.0 Update 1 Developer’s Guide to Java Web Applications .
Tuning Java Web Application Performance
Sun Java System Web Server 7.0 Update 1 Performance Tuning, Sizing, and Scaling Guide • 80