Computer Accessories User Manual

Running the Oracle HTTP Server on OpenVMS
Apache Server Installation/Configuration D-5
Performance Considerations
You should have prior experience tuning the performance of the OpenVMS
operating system
. For general information on OpenVMS performance, see the
OpenVMS Performance Management Manual at the following URL:
http://www.openvms.compaq.com:8000/73final/6491/6491pro.html
Recommendations for improving performance on a Oracle HTTP Server are
provided below and in the Release Notes:
Limits and Quotas
The following table shows sample values for the ORACLE Account from a working
and exercised Oracle HTTP Server with a light to moderate load
. These values are
presented as an example of a system performing well within its context
. If you
should experience performance difficulties, refer to this table for guidelines in
making adjustments
. For heavier loads, we point out which values, in our
experience, need to be increased as load increases
. Keep in mind that no one set of
values will be appropriate for all situations.
Table D–1 Sample Values for the ORACLE Account
Parameter Default On Hewlett-Packard Web Server
ASTLM (NonPooled)
Total number of asynchronous
system trap (AST) operations and
scheduled wake-up requests the
user can have queued at one time
250 610
Or BIOLM + DIOLM + 10
BIOLM (NonPooled)
Number of outstanding buffered
I/O operations permitted for a
user’s process
150 300
You might also need to increase the
SYSGEN parameter CHANNELCNT
because it limits BIOLM,DIOLM, and
FILLM.
BYTLM (Pooled)
Amount of buffer space a user’s
process can use
64000 200000
Increase this value for a heavy load.
CHANNELCNT 256 FILLM and CHANNELCNT should be
increased to match each other.