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44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
Zend Memory Manager
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===================
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General:
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--------
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The goal of the new memory manager (available since PHP 5.2) is to reduce memory
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allocation overhead and speedup memory management.
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The new manager's "configure" has no "--disable-zend-memory-manager" option,
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but it has "--enable-malloc-mm" instead. It is enabled by default in DEBUG
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build and disabled by default in RELEASE build. When enabled it allows selecting
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between malloc and emalloc at runtime so you can use internal and external memory
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debuggers without recompilation.
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Debugging:
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----------
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Normal:
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$ sapi/cli/php -r 'leak();'
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Zend MM disabled:
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$ USE_ZEND_ALLOC=0 valgrind --leak-check=full sapi/cli/php -r 'leak();'
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Shared extensions:
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------------------
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Since PHP 5.4 it is possible to prevent shared extensions from unloading so
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that valgrind can correctly track the memory leaks in shared extensions. For
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this there is the ZEND_DONT_UNLOAD_MODULES environment variable. If set, then
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DL_UNLOAD() is skipped during the shutdown of shared extensions.
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Tweaking:
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---------
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The Zend MM can be tweaked using ZEND_MM_MEM_TYPE and ZEND_MM_SEG_SIZE environment
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variables. Default values are "malloc" and "256K". Dependent on target system you
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can also use "mmap_anon", "mmap_zero" and "win32" storage managers.
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$ ZEND_MM_MEM_TYPE=mmap_anon ZEND_MM_SEG_SIZE=1M sapi/cli/php ..etc.
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