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       passenger-memory-stats  -  reports a snapshot of the Apache and Phusion
       Passenger memory statistcs




       passenger-memory-stats allows you to easily  analyze  the  real  memory
       usage of Phusion Passenger and Apache.

       Process inspection tools such as ps and top are useful, but they rarely
       show the correct memory usage. The real memory usage is  usually  lower
       than what ps and top report.

       There  are many technical reasons why this is so, but an explanation is
       beyond the scope of this  page.  We  refer  the  interested  reader  to
       operating systems literature about virtual memory and copy-on-write.

       When you run this tool the Private or private dirty RSS field shows the
       real memory usage of processes.


       HTTPD  The  full  filename  to  the  Apache  executable.  By   default,
              Passenger  will  attempt to autodetect the Apache executable. If
              autodetection fails for whatever reason, then  Apache  processes
              will  not  be  shown in the memory statistics. In that case, you
              may manually specify the location to the Apache executable using
              this environment variable.


       passenger-status(8), ps(1), top(1),

       User guide at


       Phusion Passenger is written by Phusion (

       "Phusion"  and  "Phusion Passenger" are trademarks of Hongli Lai & Ninh

       This manual page was written by Neil Wilson <>  for
       the Ubuntu project (but may be used by others).