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What is the PHP Shared Memory (mm, --with-mm) session module?

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http://stackoverflow.com – What is the PHP Shared Memory Allocation (mm, compiled --with-mm) session module? Have you used it? Have you tested it? Does it work good? Did you have session locking problems? It's easy to view the contents of your session data when using files or a custom session handler (like a database), but is it possible to view the session data with this module? Personal reasons for wanting to view the session data would be to (1) test PHP garbage collection is working properly and (2) make sure it isn't hogging all the system memory. I think it used to be a separate (PECL? Zend?) extension, but now (HowTos)