Solution to slow build of apache and gcc
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We found it was taking from two to three hours to run the configure script for apache. After searching we found that the solution was to change the environment variable CONFIG_SHELL to point to a different shell than the default ksh. When this was done, the multi-hour run of ./configure was done in 3 minutes.
From the Mozilla site for AIX it says:
From testing, I found I could also use ksh93 and get similar results.
Why does this happen? What has been reported is that ksh uses /tmp files for redirection, piping, shelling, etc., while the other shells actually use memory for these purposes.
ls -l | grep -E "Feb 15"
showed that while running with ksh I had 50 or so files active at any time, while with the other shells there was very little activity.
showed that I had 100% usage of hdisk0.
Spread the word.