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cpp-doc-jemalloc使用

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介绍

jemalloc是有名的内存管理模块，比libc速度更快的库，可以替换libc的malloc，从而使得程序的性能得到提升。

安装

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# 下载
wget https://github.com/jemalloc/jemalloc/releases/download/5.2.0/jemalloc-5.2.0.tar.bz2
# 解压
tar xjvf jemalloc-5.2.0.tar.bz2
cd jemalloc-5.2.0/
# 函数编译
# 不加 --with-jemalloc-prefix=je_，默认函数会编译成malloc等，与libc一样的名称
./configure --with-jemalloc-prefix=je_  
make

网址

官网 http://jemalloc.net

文档 https://people.freebsd.org/~jasone/jemalloc/bsdcan2006/jemalloc.pdf

GitHub 版本 https://github.com/jemalloc/jemalloc/releases

静态库使用

库相关处理

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cd ../
mkdir testproject
mkdir lib
mkdir include

# 头文件和库文件拷贝
cp jemalloc-5.2.0/include/jemalloc/jemalloc.h ./include/ 
cp jemalloc-5.2.0/include/jemalloc/jemalloc_defs.h ./include
cp libjemalloc.a ./lib/

测试代码

jemalloc.h
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#ifndef _DIYMALLOC_H_
#define _DIYMALLOC_H_

#include <jemalloc.h>

// 重新定义malloc等函数
#define malloc(size) je_malloc(size)
#define calloc(count,size) je_calloc(count,size)
#define realloc(ptr,size) je_realloc(ptr,size)
#define free(ptr) je_free(ptr)

#endif
main.cpp
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#include <stdio.h>
#include "jemalloc.h"

int main(void)
{
    char *pcon;

    pcon = (char *)malloc(10*sizeof(char));
    if (!pcon)
        fprintf(stderr, "malloc failed!\n");

	if (pcon != NULL) {
		free(pcon);
		pcon = NULL;
	}
    fprintf(stderr, "main end!\n");
    return 0;
}
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CC=g++
CFLAGS=-Wall -g
INCLUDES=-I ./include/
ALLOC_DEP=./lib/libjemalloc.a
ALLOC_LINK=$(ALLOC_DEP) -lpthread -ldl

dtest: dtest.o
    $(CC) $(INCLUDES) $(CFLAGS) -o dtest dtest.o $(ALLOC_LINK)

dtest.o: dtest.c $(ALLOC_DEP)
    $(CC) -c $(INCLUDES) $(CFLAGS) dtest.c

clean:
    rm -f dtest dtest.o