In a multi-processor environment running on an AIX platform, if you are intending to use multi-threaded applications,
the OS recommendation is to set the environment variable AIXTHREAD_SCOPE=S before invoking this application.
It results in improved performance of the application.
The syntax to set this variable is:
% export AIXTHREAD_SCOPE=S
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Please also note that setting AIXTHREAD_SCOPE=S is recommended in
Note 169706.1 : Oracle Database (RDBMS) on Unix AIX,HP-UX,Linux,Mac OS X,Solaris,Tru64 Unix Operating Systems Installation and Configuration Requirements Quick Reference (8.0.5 to 11.2)