黄页网站推广服务,设计logo的ai软件,有没关于做动画设计师的网站,书签制作方法使用jemalloc实现信号驱动的程序堆栈信息打印
本文介绍应用如何集成jemalloc#xff0c;在接收到SIGUSR1信号10时打印程序的堆栈信息。
1. 编译jemalloc
首先#xff0c;确保你已经编译并安装了启用prof功能的jemalloc。以下是ubuntu18.04上的编译步骤#xff1a;
git c…使用jemalloc实现信号驱动的程序堆栈信息打印
本文介绍应用如何集成jemalloc在接收到SIGUSR1信号10时打印程序的堆栈信息。
1. 编译jemalloc
首先确保你已经编译并安装了启用prof功能的jemalloc。以下是ubuntu18.04上的编译步骤
git clone https://github.com/jemalloc/jemalloc.git # 本文测试的版本是jemalloc-5.3.0
cd jemalloc
./configure --prefix/usr/local --enable-prof
make -j10
make install2. 测试
假如你的需要集成的程序为example通过LD_PRELOAD同时加载jemalloc和钩子库按照以下步骤运行和测试 设置环境变量 export MALLOC_CONFprof:true,prof_active:true,lg_prof_sample:0,tcache:false,prof_prefix:jeprof.outprof:true 启用配置文件prof_active:true 启用性能分析lg_prof_sample:0 设置采样率为最频繁tcache:false禁用线程缓存Thread Cache。 禁用线程缓存可能会影响性能但在进行性能分析时可以提供更准确的内存分配数据。 prof_prefix:jeprof.out 指定性能分析输出文件前缀 使用killall -10 example发送SIGUSR1信号以触发堆栈信息打印 killall -10 example # 或者 killall -SIGUSR1 example通过以上步骤你可以在接收到SIGUSR1信号时打印jemalloc的堆栈信息并将其输出到本地目录。 本文得到的堆栈信息文件名为jeprof.out.60571.0.m0.heap ,通过如下命令分析该堆栈信息文件 jeprof --show_bytes --text --lines ./example ./jeprof.out.60571.0.m0.heap解析的结果为 $ jeprof --show_bytes --text --lines ./example ./jeprof.out.60571.0.m0.heap
Using local file ./example.
Using local file ./jeprof.out.60571.0.m0.heap.
Total: 83512 B83512 100.0% 100.0% 83512 100.0% prof_backtrace_impl /home/test/jemalloc-5.3.0/src/prof_sys.c:1030 0.0% 100.0% 1024 1.2% _IO_new_file_overflow /build/glibc-2ORdQG/glibc-2.27/libio/fileops.c:7590 0.0% 100.0% 1024 1.2% _IO_new_file_xsputn /build/glibc-2ORdQG/glibc-2.27/libio/fileops.c:12660 0.0% 100.0% 1024 1.2% __GI__IO_doallocbuf /build/glibc-2ORdQG/glibc-2.27/libio/genops.c:3650 0.0% 100.0% 1024 1.2% __GI__IO_file_doallocate /build/glibc-2ORdQG/glibc-2.27/libio/filedoalloc.c:1010 0.0% 100.0% 1024 1.2% __GI__IO_fwrite /build/glibc-2ORdQG/glibc-2.27/libio/iofwrite.c:390 0.0% 100.0% 1592 1.9% __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:3100 0.0% 100.0% 81920 98.1% _dl_start_user :?0 0.0% 100.0% 1592 1.9% _start ??:?0 0.0% 100.0% 8 0.0% allocateDouble /home/test/jemalloc_test/example.cpp:190 0.0% 100.0% 80 0.1% allocateDynamicArray /home/test/jemalloc_test/example.cpp:32 (discriminator 1)0 0.0% 100.0% 448 0.5% allocateIntArray /home/test/jemalloc_test/example.cpp:130 0.0% 100.0% 1024 1.2% allocateIntArray /home/test/jemalloc_test/example.cpp:140 0.0% 100.0% 1472 1.8% allocateMemory /home/test/jemalloc_test/example.cpp:510 0.0% 100.0% 8 0.0% allocateMemory /home/test/jemalloc_test/example.cpp:520 0.0% 100.0% 32 0.0% allocateMemory /home/test/jemalloc_test/example.cpp:530 0.0% 100.0% 80 0.1% allocateMemory /home/test/jemalloc_test/example.cpp:540 0.0% 100.0% 32 0.0% allocateString /home/test/jemalloc_test/example.cpp:250 0.0% 100.0% 81920 98.1% call_init /build/glibc-2ORdQG/glibc-2.27/elf/dl-init.c:720 0.0% 100.0% 83512 100.0% imalloc (inline) /home/test/jemalloc-5.3.0/src/jemalloc.c:26940 0.0% 100.0% 83512 100.0% imalloc_body (inline) /home/test/jemalloc-5.3.0/src/jemalloc.c:25500 0.0% 100.0% 83512 100.0% je_malloc_default /home/test/jemalloc-5.3.0/src/jemalloc.c:27220 0.0% 100.0% 83512 100.0% je_prof_backtrace /home/test/jemalloc-5.3.0/src/prof_sys.c:2840 0.0% 100.0% 83512 100.0% je_prof_tctx_create /home/test/jemalloc-5.3.0/src/prof.c:1950 0.0% 100.0% 1592 1.9% main /home/test/jemalloc_test/example.cpp:730 0.0% 100.0% 83512 100.0% prof_alloc_prep (inline) /home/test/jemalloc-5.3.0/include/jemalloc/internal/prof_inlines.h:1410 0.0% 100.0% 81920 98.1% std::__once_callable ??:00 0.0% 100.0% 1024 1.2% std::__ostream_insert ??:?0 0.0% 100.0% 1024 1.2% std::operator ??:?0 0.0% 100.0% 568 0.7% void* fallback_impl /home/test/jemalloc-5.3.0/src/jemalloc_cpp.cpp:98
3. 本人测试的example.cpp代码
以下是完整的example.cpp代码编译方法: g -g -o example example.cpp
// g -g -o example example.cpp
#include jemalloc/jemalloc.h // jemalloc
#include sys/mman.h // mmap, munmap
#include unistd.h // usleep
#include csignal // signal, sigaction
#include cstdlib // rand()和srand()
#include ctime // time()
#include iostream
#include string
#include vector// 分配int数组
void allocateIntArray() {const int* intPtr new int[100];std::cout Allocated int array at: intPtr std::endl;
}// 分配double
void allocateDouble() {const double* doublePtr new double(3.14);std::cout Allocated double at: doublePtr , value: *doublePtr std::endl;
}// 分配字符串
void allocateString() {const std::string* strPtr new std::string(Hello, World!);std::cout Allocated string at: strPtr , value: *strPtr std::endl;
}// 分配动态数组
void allocateDynamicArray() {size_t arraySize 10;size_t* const arrayPtr new size_t[arraySize];std::cout Allocated array of arraySize ints at: arrayPtr std::endl;for (size_t i 0; i arraySize; i) {arrayPtr[i] i;}
}// 使用mmap分配内存
void allocateMmap() {size_t mmapSize 4096; // 4KBconst void* mmapPtr mmap(nullptr, mmapSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);if (mmapPtr MAP_FAILED) {perror(mmap failed);} else {std::cout Allocated mmap at: mmapPtr , size: mmapSize bytes std::endl;}
}void allocateMemory() {allocateIntArray();allocateDouble();allocateString();allocateDynamicArray();allocateMmap();
}// 信号处理函数
void signalHandler(int signum) {std::cout Signal ( signum ) received, printing heap profile: std::endl;mallctl(prof.dump, nullptr, nullptr, nullptr, 0);
}int main() {// 设置信号处理函数struct sigaction action;action.sa_handler signalHandler;sigemptyset(action.sa_mask);action.sa_flags 0;sigaction(SIGUSR1, action, nullptr);usleep(100000); // 100msallocateMemory();while (true) {usleep(100000); // 100ms}return 0;
}
