ptmalloc 是glibc的内存分配管理
tcmalloc 是google的内存分配管理模块
jemalloc 是BSD的提供的内存分配管理
代码如下:
#include #include <map> using namespace std; int main(int argc, char**argv) { cout << "Hello world" << endl; std::map<int,int> int_map; for (int i = 0; i < 10000000; ++i) { int_map.insert(std::map<int,int>::value_type(i,i)); } return 0; } </map> |
都是执行一个map insert 100W次操作。
为了测试方便,我们生成了3个binary,分别链接使用jemalloc和tcmalloc 和ptmalloc的库做对比:
dd jemalloc_test linux-vdso.so.1 => (0x00007fffc6fc3000) libjemalloc.so.1 => /usr/local/lib/libjemalloc.so.1 (0x00007f45181aa000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f4517ea4000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4517c1e000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f4517a08000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4517673000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4517454000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4517250000) /lib64/ld-linux-x86-64.so.2 (0x00007f45183f2000) ldd tcmalloc_test linux-vdso.so.1 => (0x00007fff94160000) libtcmalloc.so.0 => /usr/lib/libtcmalloc.so.0 (0x00007f20107dc000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f20104d6000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f2010250000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f201003a000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f200fca5000) libunwind.so.7 => /usr/lib/libunwind.so.7 (0x00007f200fa8b000) /lib64/ld-linux-x86-64.so.2 (0x00007f2010a68000) ldd ptmalloc_test linux-vdso.so.1 => (0x00007fff08501000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f7e6c156000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7e6bed1000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f7e6bcba000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7e6b925000) /lib64/ld-linux-x86-64.so.2 (0x00007f7e6c483000)
然后分别执行各程序,使用time统计时间如下:
time./jemalloc_test Hello world real 0m9.927s user 0m9.650s sys 0m0.250s time ./tcmalloc_test Hello world real 0m9.836s user 0m9.410s sys 0m0.410s time ./ptmalloc_test Hello world real 0m11.890s user 0m11.520s sys 0m0.360s |
jemalloc和tcmalloc的性能不分伯仲,而ptmalloc则要低一些。
这里简单介绍下性能。后面抽时间再介绍下各自的实现原理。