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C++ exe程序内存占用分析之Linux篇

news 来源：原创 2024/9/21 0:56:08

基础分析

git clone --recursive https://github.com/google/bloatycd bloatygit submodule updatemkdir buildcd buildcmake ..make -j8bloaty bloatyFILE SIZE        VM SIZE    --------------  --------------35.5%  16.9Mi   0.0%       0    .debug_info25.2%  12.0Mi   0.0%       0    .debug_loc11.2%  5.36Mi   0.0%       0    .debug_str6.9%  3.29Mi   0.0%       0    .debug_ranges5.8%  2.75Mi   0.0%       0    .debug_line5.2%  2.46Mi  34.0%  2.46Mi    .rodata4.6%  2.21Mi  30.6%  2.21Mi    .text0.0%       0  14.0%  1.01Mi    .bss1.1%   556Ki   0.0%       0    .strtab0.9%   441Ki   6.0%   441Ki    .data0.8%   395Ki   5.4%   395Ki    .rela.dyn0.7%   344Ki   4.7%   344Ki    .data.rel.ro0.7%   334Ki   0.0%       0    .debug_abbrev0.6%   274Ki   3.7%   274Ki    .eh_frame0.5%   226Ki   0.0%       0    .symtab0.1%  50.5Ki   0.7%  50.5Ki    .gcc_except_table0.1%  49.3Ki   0.7%  49.3Ki    .eh_frame_hdr0.1%  37.0Ki   0.0%       0    .debug_aranges0.0%  21.6Ki   0.3%  18.7Ki    [25 Others]0.0%  6.67Ki   0.0%       0    [Unmapped]0.0%  6.06Ki   0.1%  6.06Ki    .dynstr100.0%  47.7Mi 100.0%  7.22Mi    TOTA

源文件分析

bloaty bloaty -d compileunitsFILE SIZE        VM SIZE    --------------  -------------- 37.0%  17.6Mi  48.6%  3.51Mi    [155 Others]15.1%  7.22Mi   3.5%   258Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/descriptor.cc6.5%  3.09Mi   2.9%   216Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/descriptor.pb.cc4.8%  2.28Mi   1.4%   100Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/text_format.cc4.7%  2.25Mi   5.7%   424Ki    /home/vboxuser/Desktop/bloaty/third_party/capstone/arch/ARM/ARMDisassembler.c3.1%  1.48Mi   1.2%  90.7Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/generated_message_reflection.cc2.6%  1.25Mi   0.5%  33.3Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/descriptor_database.cc2.4%  1.15Mi   0.9%  68.6Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/extension_set.cc2.3%  1.07Mi   0.4%  31.6Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/generated_message_util.cc0.8%   379Ki  14.6%  1.06Mi    /home/vboxuser/Desktop/bloaty/third_party/capstone/arch/M68K/M68KDisassembler.c2.1%  1.02Mi   0.8%  60.9Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/wire_format.cc2.1%  1.02Mi   1.5%   111Ki    /home/vboxuser/Desktop/bloaty/third_party/capstone/arch/AArch64/AArch64Disassembler.c2.0%   981Ki  11.7%   862Ki    /home/vboxuser/Desktop/bloaty/third_party/capstone/arch/X86/X86Mapping.c2.0%   981Ki   1.1%  79.1Ki    /home/vboxuser/Desktop/bloaty/third_party/capstone/arch/SystemZ/SystemZDisassembler.c2.0%   970Ki   0.5%  37.1Ki    /home/vboxuser/Desktop/bloaty/third_party/re2/re2/re2.cc1.9%   920Ki   0.8%  60.3Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/map_field.cc1.9%   920Ki   0.5%  33.3Ki    /home/vboxuser/Desktop/bloaty/third_party/re2/re2/dfa.cc1.8%   889Ki   1.7%   125Ki    /home/vboxuser/Desktop/bloaty/src/bloaty.cc1.6%   788Ki   0.5%  33.7Ki    /home/vboxuser/Desktop/bloaty/third_party/re2/re2/regexp.cc1.6%   781Ki   0.7%  51.4Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/repeated_field.cc1.6%   766Ki   0.5%  37.9Ki    /home/vboxuser/Desktop/bloaty/third_party/protobuf/src/google/protobuf/message.cc100.0%  47.7Mi 100.0%  7.22Mi    TOTAL

测试


#include <iostream>const char* data = "而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九而此时是ii四十九";int main() {printf("test main\n");
}

g++ -g main.cpp -o mytest
bloaty mytest -d compileunitsFILE SIZE        VM SIZE    --------------  -------------- 56.9%  21.6Ki  16.6%     609    main.cpp22.2%  8.46Ki   0.0%       0    [Unmapped]5.9%  2.25Ki   0.0%       0    [ELF Section Headers]4.1%  1.57Ki   0.0%       0    [section .symtab]1.9%     728  19.9%     728    [ELF Program Headers]1.5%     603   0.0%       0    [section .strtab]1.3%     512  14.0%     512    [section .dynamic]1.0%     394   9.2%     335    [16 Others]0.9%     346   0.0%       0    [section .shstrtab]0.6%     247   6.7%     247    [section .rodata]0.6%     240   6.6%     240    [section .dynsym]0.6%     233   6.4%     233    [section .text]0.6%     229   6.3%     229    [section .dynstr]0.4%     152   0.0%       0    0.3%     136   3.7%     136    [section .eh_frame]0.2%      88   2.4%      88    [section .got]0.2%      80   2.2%      80    [section .gnu.version_r]0.2%      64   1.7%      64    [ELF Header]0.2%      64   1.7%      64    [section .plt]0.1%      48   1.3%      48    [section .note.gnu.property]0.1%      48   1.3%      48    [section .plt.sec]100.0%  38.0Ki 100.0%  3.58Ki    TOTAL