# passenger-memory-stats - reports a snapshot of the Apache and Phusion Pas... - man(8) - [phpMan]

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## NAME
       passenger-memory-stats  -  reports a snapshot of the Apache and Phusion Passenger memory sta‐
       tistcs

## SYNOPSIS
### passenger-memory-stats

## DESCRIPTION
       **passenger-memory-stats **allows you to easily analyze the real memory usage of Phusion  Passen‐
       ger and Apache.

       Process inspection tools such as _ps_ and _top_ are useful, but they rarely show the correct mem‐
       ory 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  mem‐
       ory and copy-on-write.

       When  you run this tool the _Private_ or _private_ _dirty_ _RSS_ field shows the real memory usage of
       processes.

## ENVIRONMENT VARIABLES
       **HTTPD  **The full filename to the Apache executable. By default, Passenger will attempt to  au‐
              todetect  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 vari‐
              able.

## SEE ALSO
       [passenger-status(8)](https://www.chedong.com/phpMan.php/man/passenger-status/8/markdown), [ps(1)](https://www.chedong.com/phpMan.php/man/ps/1/markdown), [top(1)](https://www.chedong.com/phpMan.php/man/top/1/markdown),

       User guide at <https://www.phusionpassenger.com/documentation_and_support>

## AUTHOR
       Phusion Passenger is written by Phusion (<http://www.phusion.nl>)

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

Phusion Passenger                                2.0                       [_passenger-memory-stats_(8)](https://www.chedong.com/phpMan.php/man/passenger-memory-stats/8/markdown)