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Annotation of embedaddon/php/Zend/README.ZEND_MM, revision 1.1.1.2

1.1       misho       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
1.1.1.2 ! misho      12: build and disabled by default in RELEASE build. When enabled it allows selecting
1.1       misho      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: 
1.1.1.2 ! misho      27: Shared extensions:
        !            28: ------------------
        !            29: 
        !            30: Since PHP 5.3.11 it is possible to prevent shared extensions from unloading so
        !            31: that valgrind can correctly track the memory leaks in shared extensions. For
        !            32: this there is the ZEND_DONT_UNLOAD_MODULES environment variable. If set, then
        !            33: DL_UNLOAD() is skipped during the shutdown of shared extensions.
        !            34: 
        !            35: 
1.1       misho      36: Tweaking:
                     37: ---------
                     38: 
                     39: The Zend MM can be tweaked using ZEND_MM_MEM_TYPE and ZEND_MM_SEG_SIZE environment
                     40: variables.  Default values are "malloc" and "256K". Dependent on target system you
                     41: can also use "mmap_anon", "mmap_zero" and "win32" storage managers.
                     42: 
                     43:        $ ZEND_MM_MEM_TYPE=mmap_anon ZEND_MM_SEG_SIZE=1M sapi/cli/php ..etc.