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    1: Zend Memory Manager
    2: ===================
    3: 
    4: General:
    5: --------
    6: 
    7: The goal of the new memory manager (available since PHP 5.2) is to reduce memory
    8: allocation overhead and speedup memory management.
    9: 
   10: The new manager's "configure" has no "--disable-zend-memory-manager" option,
   11: but it has "--enable-malloc-mm" instead.  It is enabled by default in DEBUG
   12: build and disabled by default in RELEASE build.  when enabled it allows selecting
   13: between malloc and emalloc at runtime so you can use internal and external memory
   14: debuggers without recompilation.
   15: 
   16: Debugging:
   17: ----------
   18: 
   19: Normal:
   20: 
   21:     $ sapi/cli/php -r 'leak();'
   22: 
   23: Zend MM disabled:
   24: 
   25:     $ USE_ZEND_ALLOC=0 valgrind --leak-check=full sapi/cli/php -r 'leak();'
   26: 
   27: Tweaking:
   28: ---------
   29: 
   30: The Zend MM can be tweaked using ZEND_MM_MEM_TYPE and ZEND_MM_SEG_SIZE environment
   31: variables.  Default values are "malloc" and "256K". Dependent on target system you
   32: can also use "mmap_anon", "mmap_zero" and "win32" storage managers.
   33: 
   34: 	$ ZEND_MM_MEM_TYPE=mmap_anon ZEND_MM_SEG_SIZE=1M sapi/cli/php ..etc.