标签：fetch time size 代码 批评 val ssi tracking mon
<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">又到了一个能够沉思的夜晚。近期事情比較繁杂，大脑全然平静不下来。就想着研究点东西来平复一下。</span>
<?php
/**
*生成100个数据到memcache里。能够思考下，数据会怎么存储
*/
$memClient = new Memcached();
$memClient->addServers(array(’10.21.1.11’,’11233’),array(’10.21.1.12’,’11233’));
for($i = 0;$i < 100;$i++){
$memClicent->set(“prefix_key_”.$i,$i,3600);
}<?php
$memClient = new Memcached();
$memClient->addServers(array(’10.21.1.11’,’11233’),array(’10.21.1.12’,’11233’));
for($i = 0;$i < 100;$i++){
$memClicent->get(“prefix_key_”.$i);
}PHP_METHOD(Memcached, set)
{
php_memc_store_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, MEMC_OP_SET, 0);
}status = memcached_set(m_obj->memc, key, key_len, payload, payload_len, expiration, flags);
uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length); memcached_instance_st* instance= memcached_instance_fetch(ptr, server_key);
return hashkit_digest(&ptr->hashkit, key, key_length);返回一个长整型，返回的这个值就是路由到哪个server的关键
return self->base_hash.function(key, key_length, self->base_hash.context);
status = memcached_set(m_obj->memc, key, key_len, payload, payload_len, expiration, flags);这里有个m_obj->memc。这是memcached_set传递的第一个參数，于是self->base_hash能够想像成
m_obj->memc->hashkit->base_hash.function(key, key_length, self->base_hash.context);
typedef struct {
zend_object zo;
struct memc_obj {
memcached_st *memc;
zend_bool compression;
enum memcached_serializer serializer;
enum memcached_compression_type compression_type;
#if HAVE_MEMCACHED_SASL
zend_bool has_sasl_data;
#endif
long store_retry_count;
} *obj;
zend_bool is_persistent;
zend_bool is_pristine;
int rescode;
int memc_errno;
} php_memc_t;struct hashkit_st
{
struct hashkit_function_st {
hashkit_hash_fn function;
void *context;
} base_hash, distribution_hash;
struct {
bool is_base_same_distributed:1;
} flags;
struct {
bool is_allocated:1;
} options;
void *_key;
}; if (hashkit_create(&self->hashkit) == NULL)
{
return false;
}static inline void _hashkit_init(hashkit_st *self)
{
self->base_hash.function= hashkit_one_at_a_time;
self->base_hash.context= NULL;
self->distribution_hash.function= hashkit_one_at_a_time;
self->distribution_hash.context= NULL;
self->flags.is_base_same_distributed= true;
self->_key= NULL;
}#include <libhashkit/common.h>
uint32_t hashkit_one_at_a_time(const char *key, size_t key_length, void *context)
{
const char *ptr= key;
uint32_t value= 0;
(void)context;
while (key_length--)
{
uint32_t val= (uint32_t) *ptr++;
value += val;
value += (value << 10);
value ^= (value >> 6);
}
value += (value << 3);
value ^= (value >> 11);
value += (value << 15);
return value;
}标签：fetch time size 代码 批评 val ssi tracking mon
原文地址：http://www.cnblogs.com/wzzkaifa/p/6898548.html
