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Siebel Server Installation Guide for UNIX > Tuning UNIX Operating Systems for Siebel Installation > Tuning Siebel eBusiness Applications for AIX >

Tuning the Web Server for AIX

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This section describes default values for environmental variables that are optimized for scalability on IHS Web server. You can further adjust these settings at your discretion to optimize the performance of your Web server.

The following environmental variables are set in $SIEBEL_ROOT/bin/startapa, where SIEBEL_ROOT is the root directory in which your Web server is installed:

export AIXTHREAD_SCOPE=S
export AIXTHREAD_MNRATIO=1:1
export AIXTHREAD_MUTEX_DEBUG=OFF
export AIXTHREAD_RWLOCK_DEBUG=OFF
export AIXTHREAD_COND_DEBUG=OFF
export RT_GRQ=ON
export YIELDLOOPTIME=4
export SPINLOOPTIME=1000
export SIEBEL_ASSERT_MODE=0
export MALLOCMULTIHEAP=considersize,heaps:No_of_CPUs_on_machine
export MALLOCTYPE=buckets
export LDR_CNTRL=LOADPUBLIC@MAXDATA=0x60000000

The heaps parameter value should be the number of CPUs on the Web server machine. For example, if there are two CPUs, this line should be:

export MALLOCMULTIHEAP=considersize,heaps:2

NOTE:  To conserve disk space, you can set SIEBEL_ASSERT_MODE to reduce the logging level for the Web server to a minimum.

To set the number of threads for the Web server on IHS

Using a text editor, set the values in the workers.c section of $SVR_ROOT/httpd.conf as follows:

StartServers	1
ServerLimit	1
ThreadLimit	N
MaxClients	N
MinSpareThreads	1
MaxSpareThreads	N
ThreadsPerChild	N
MaxRequestsPerChild	0

where:

N = three times the average number of concurrent users that the Web server must support, or N = (3*average_number_of_concurrent_users).

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