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[2009-02-16 17:23 UTC] basant dot kukreja at gmail dot com
Description:
------------
I found that APC is consuming twice more time in my_compile_file in threaded version than in single threaded
fastcgi version.
Later on debugging, I found out that apc is always copying opcodes in threaded
php. needcopy variable in my_prepare_op_array_for_execution was always 1.
From my_prepare_op_array_for_execution :
apc_opflags_t * flags = APCG(reserved_offset) != -1 ?
(apc_opflags_t*) & (src->reserved[APCG(reserved_offset)]) : NULL;
int needcopy = flags ? flags->deep_copy : 1;
flags variable was mostly NULL in my_prepare_op_array_for_execution.
Further debugging showed that reserved_offset is initialized in apc_zend_init
function. It is initialized once in multithreaded server.
In my opinion, it should have been a true global variable, not a thread local
variable.
Reproduce code:
---------------
Test simple test.php code and put a printf of needcopy. It is always 1.
Expected result:
----------------
APC should not copy opcodes for individual threads unless necessary.
Actual result:
--------------
needcopy should be 0 for most scripts. It is 1.
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Last updated: Wed Nov 05 08:00:02 2025 UTC |
Here is a patch which fixes the performance issue for APC inside multi-threaded php. --- ../../../unchanged/APC-3.0.19/./apc_compile.c 2008-05-14 23:45:27.000000000 -0700 +++ ./apc_compile.c 2009-02-16 13:48:53.978726000 -0800 @@ -1236,10 +1236,10 @@ } #ifdef ZEND_ENGINE_2 - if(APCG(reserved_offset) != -1) { + if(apc_reserved_offset != -1) { /* Insanity alert: the void* pointer is cast into an apc_opflags_t * struct. apc_zend_init() checks to ensure that it fits in a void* */ - flags = (apc_opflags_t*) & (dst->reserved[APCG(reserved_offset)]); + flags = (apc_opflags_t*) & (dst->reserved[apc_reserved_offset]); memset(flags, 0, sizeof(apc_opflags_t)); /* assert(sizeof(apc_opflags_t) < sizeof(dst->reserved)); */ } @@ -2040,8 +2040,8 @@ zend_op *zo; zend_op *dzo; #ifdef ZEND_ENGINE_2 - apc_opflags_t * flags = APCG(reserved_offset) != -1 ? - (apc_opflags_t*) & (src->reserved[APCG(reserved_offset)]) : NULL; + apc_opflags_t * flags = apc_reserved_offset != -1 ? + (apc_opflags_t*) & (src->reserved[apc_reserved_offset]) : NULL; int needcopy = flags ? flags->deep_copy : 1; /* auto_globals_jit was not in php4 */ int do_prepare_fetch_global = PG(auto_globals_jit) && (flags == NULL || flags->unknown_global); --- ../../../unchanged/APC-3.0.19/./apc_globals.h 2008-05-14 23:45:27.000000000 -0700 +++ ./apc_globals.h 2009-02-16 13:50:18.718915000 -0800 @@ -79,9 +79,6 @@ double rfc1867_freq; /* Update frequency as percentage or bytes */ #endif HashTable *copied_zvals; /* my_copy recursion detection list */ -#ifdef ZEND_ENGINE_2 - int reserved_offset; /* offset for apc info in op_array->reserved[] */ -#endif zend_bool force_file_update; /* force files to be updated during apc_compile_file */ char canon_path[MAXPATHLEN]; /* canonical path for key data */ #if APC_FILEHITS @@ -103,6 +100,9 @@ extern apc_cache_t* apc_cache; /* the global compiler cache */ extern apc_cache_t* apc_user_cache; /* the global user content cache */ extern void* apc_compiled_filters; /* compiled filters */ +#ifdef ZEND_ENGINE_2 +extern int apc_reserved_offset; /* offset for apc info in op_array->reserved[] */ +#endif #endif --- ../../../unchanged/APC-3.0.19/./apc_zend.c 2008-05-14 23:45:27.000000000 -0700 +++ ./apc_zend.c 2009-02-16 13:48:53.992013000 -0800 @@ -195,9 +195,9 @@ zval_dtor(&tmp_inc_filename); } - if(APCG(reserved_offset) != -1) { + if(apc_reserved_offset != -1) { /* Insanity alert: look into apc_compile.c for why a void** is cast to a apc_opflags_t* */ - flags = (apc_opflags_t*) & (execute_data->op_array->reserved[APCG(reserved_offset)]); + flags = (apc_opflags_t*) & (execute_data->op_array->reserved[apc_reserved_offset]); } #ifdef ZEND_ENGINE_2 @@ -223,9 +223,9 @@ { zend_extension dummy_ext; #ifdef ZEND_ENGINE_2 - APCG(reserved_offset) = zend_get_resource_handle(&dummy_ext); - assert(APCG(reserved_offset) == dummy_ext.resource_number); - assert(APCG(reserved_offset) != -1); + apc_reserved_offset = zend_get_resource_handle(&dummy_ext); + assert(apc_reserved_offset == dummy_ext.resource_number); + assert(apc_reserved_offset != -1); assert(sizeof(apc_opflags_t) <= sizeof(void*)); #endif if (!APCG(include_once)) { --- ../../../unchanged/APC-3.0.19/./php_apc.c 2008-05-14 23:45:28.000000000 -0700 +++ ./php_apc.c 2009-02-16 13:48:53.993278000 -0800 @@ -72,6 +72,9 @@ apc_cache_t* apc_cache = NULL; apc_cache_t* apc_user_cache = NULL; void* apc_compiled_filters = NULL; +#ifdef ZEND_ENGINE_2 +int apc_reserved_offset = -1; +#endif static void php_apc_init_globals(zend_apc_globals* apc_globals TSRMLS_DC) { @@ -90,9 +93,6 @@ apc_globals->rfc1867 = 0; #endif apc_globals->copied_zvals = NULL; -#ifdef ZEND_ENGINE_2 - apc_globals->reserved_offset = -1; -#endif apc_globals->force_file_update = 0; apc_globals->coredump_unmap = 0; }