HP-UX 11i v3 Read Before Installing or Updating, September 2007 (Update 1 Release)

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Performance Degradation with Single-Threaded
Applications
Single-threaded applications linked with libpthread
shows performance degradation because of thread safe
libraries having to acquire and release mutex locks.
What To Do
Install patch PHCO_36551. The new libpthread patch
PHCO_36551 reduces the overhead of calling
pthread_mutex_lock(3T) and
pthread_mutex_unlock(3T) in a single threaded
application.