How can be switch from prefork to worker MPM in running apache on solaris10

From Apache 2.2.15 Changelog there is memory leaks fix in 2.2.15 but if you top output is after apache start it's really huge from my point of view.
Did you try a worker config ?
Could you add the output of ldd tool on you httpd binary ?

On my system I just edited the /etc/sysconfig/httpd file to enable the httpd.worker.

After restarting httpd, I ran "ps -ef | grep -i http" and got this:

[root@localhost httpd]# ps -ef | grep -i http
root     16334 17289  0 10:44 pts/1    00:00:00 grep -i http
root     30536     1  0 10:00 ?        00:00:00 /usr/sbin/httpd.worker
apache   30539 30536  0 10:00 ?        00:00:00 /usr/sbin/httpd.worker
apache   30541 30536  0 10:00 ?        00:00:02 /usr/sbin/httpd.worker
[root@localhost httpd]# 

If I switch the /etc/sysconfig/httpd back to the default, the ps output is like this:

[root@localhost httpd]# ps -ef | grep -i http
root     16447     1  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16448 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16449 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16450 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16451 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16453 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16454 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16455 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16456 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
root     16458 17289  0 10:47 pts/1    00:00:00 grep -i http
[root@localhost httpd]# 

And in this case the "httpd -V" output is the same as before.

Since the number of running processes matches my configuration options for the prefork and worker modules set in the "/etc/httpd/conf/httpd.conf" I believe it's working as advertised.

I suspect the "httpd -V" is reporting the compiled in defaults. because: server binary names are different. httpd (prefork,default) != httpd.worker (non-default)

Dan