ub_server_running_memory_layout

2016-06-22 11:31:05   0  举报

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ub_server_running_memory_layout 是一个用于描述服务器运行时内存布局的概念。它涉及到服务器在运行过程中，各种数据和程序在内存中的分配和组织方式。一个良好的内存布局可以提高服务器的性能和稳定性，因为它可以确保关键数据和代码位于内存中容易访问的位置，从而减少访问延迟并提高缓存命中率。此外，合理的内存布局还可以帮助服务器更有效地利用有限的内存资源，避免内存碎片和浪费。在实际应用中，开发人员需要根据服务器的硬件特性、操作系统和应用程序的需求来设计和优化内存布局。

作者其他创作

大纲/内容

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void* user_buf

....................

void* parent

指针service_handler_base*

thread_data

从client fd读入请求内容

12 pointers 1 per threadeach stores addr of athread_instance_data objadjacently allocated in heap

type=void *size=8 bytes

...........................

nshead

mcpack

ub_server_pdata_t

int fd

字符串\"create_direct_trans\"

一个thread的client fd读入的请求放入本thread的read buffer发往该thread的thread_instance_data里面的handlers_ map里面的对应的service_handler_wrapper对象中的handler对象，比如create_direct_trans_service对象的handle函数处理处理的响应也存入本thread的write buffer最终发给本thread的client fd

内部调用obj-handle()

void* data

thread_instance_data

create_direct_trans_service obj

pay_direct_trans_service obj

pthread_t pid

void* write_buf

12 thread_instance_data obj separately allocated in heap

associate with

g_pkey for thread 1

按nshead+mcpack协议解析请求内容供实际各service对象的handle函数内部消费

.................................

ub_server_handle

Stack

void* usersef_buf

each per-thread pointerstores addr of another pointer storing the addr of the per-thread thread_instance_data obj

type=void*size=sizeof(/thread_instance_data**)

1)inside one thread_instance_data its thread_data member variable is used by all service objs like create_direct_trans_serice for construction2)members of thread_data like sql_db_session_map are initialized inside constructors of service classes like create_direct_trans_service

int (* cb_native)()

thread_instance_data for thread 0newed inside dispatcher::create_thread_datahold own map of cmd-service_handler_wrapper*

total size=12*sizeof(void *)there are 12 pointers1 per threadadjacently allocated in heap

.........................

int sev_sock

13 per-thread data key12 worker threads1 main threadthis is in kernel space

字符串\"pay_direct_trans\"

void* pool

each thread_instance_data objhas its own set of pointerspointing to their own set of service objs like create_direct_trans_serivce

all service objs in one thread share db sessions(essentially connections to mysql servers)held by that thread's thread_data instance

void* read_buf

Heap