关于内存限制1MB

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2026-04-08 22:57:17

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tough@localhost:/mnt/c/Users/nansh/Downloads$ g++ -O2 -nostdlib -nostartfiles -static test.cpp -o test
tough@localhost:/mnt/c/Users/nansh/Downloads$ ./test
7tough@localhost:/mnt/c/Users/nansh/Downloads$ smem -p -P test
  PID User     Command                         Swap      USS      PSS      RSS
 1949 tough    /usr/bin/python3 /usr/bin/s    0.00%    0.09%    0.12%    0.18%
tough@localhost:/mnt/c/Users/nansh/Downloads$ perf stat ./test
7
 Performance counter stats for './test':

                 0      context-switches:u               #      0.0 cs/sec  cs_per_second
                 0      cpu-migrations:u                 #      0.0 migrations/sec  migrations_per_second
                 1      page-faults:u                    #   2278.4 faults/sec  page_faults_per_second
              0.44 msec task-clock:u                     #      0.0 CPUs  CPUs_utilized
                 3      branch-misses:u                  #    100.0 %  branch_miss_rate
                 3      branches:u                       #      0.0 M/sec  branch_frequency
             1,564      cpu-cycles:u                     #      0.0 GHz  cycles_frequency
                12      instructions:u                   #      0.0 instructions  insn_per_cycle
     <not counted>      stalled-cycles-frontend:u        #      nan frontend_cycles_idle        (0.00%)

       0.003985969 seconds time elapsed

       0.000000000 seconds user
       0.001766000 seconds sys


tough@localhost:/mnt/c/Users/nansh/Downloads$

Ubuntu 24.04 LTS 内核上内存使用小于1MB
我的代码：

#pragma GCC optimize("O2")
#pragma GCC optimize("Os")
#pragma GCC optimize("no-exceptions")

asm(".global _start\n"
    "_start:\n"
    "sub $8, %rsp\n"
    "movb $0x37, (%rsp)\n"
    "mov $1, %rax\n"
    "mov $1, %rdi\n"
    "mov %rsp, %rsi\n"
    "mov $1, %edx\n"
    "syscall\n"
    "add $8, %rsp\n"
    "mov $60, %rax\n"
    "xor %rdi, %rdi\n"
    "syscall\n"
);

由于ACGO上无法使用-nostdlib -nostartfiles -static，我会把代码改成有主函数的版本：

#pragma GCC optimize("O2")
#pragma GCC optimize("Os")
#pragma GCC optimize("no-exceptions")

int main() {
    asm volatile (
        "sub $8, %%rsp\n"
        "movb $0x37, (%%rsp)\n"
        "mov $1, %%rax\n"
        "mov $1, %%rdi\n"
        "mov %%rsp, %%rsi\n"
        "mov $1, %%edx\n"
        "syscall\n"
        "add $8, %%rsp\n"
        "mov $60, %%rax\n"
        "xor %%rdi, %%rdi\n"
        "syscall\n"
        ::: "rax","rdi","rsi","rdx","rsp"
    );
}

测评结果：
测试结果
ACGO兼容版的测试：

tough@localhost:/mnt/c/Users/nansh/Downloads$ smem -p -P test
  PID User     Command                         Swap      USS      PSS      RSS
 2165 tough    /usr/bin/python3 /usr/bin/s    0.00%    0.09%    0.12%    0.18%
tough@localhost:/mnt/c/Users/nansh/Downloads$ perf stat ./test
7
 Performance counter stats for './test':

                 0      context-switches:u               #      0.0 cs/sec  cs_per_second
                 0      cpu-migrations:u                 #      0.0 migrations/sec  migrations_per_second
                 1      page-faults:u                    #   2155.8 faults/sec  page_faults_per_second
              0.46 msec task-clock:u                     #      0.0 CPUs  CPUs_utilized
                 3      branch-misses:u                  #    100.0 %  branch_miss_rate
                 3      branches:u                       #      0.0 M/sec  branch_frequency
             2,810      cpu-cycles:u                     #      0.0 GHz  cycles_frequency
                12      instructions:u                   #      0.0 instructions  insn_per_cycle
     <not counted>      stalled-cycles-frontend:u        #      nan frontend_cycles_idle        (0.00%)

       0.003652769 seconds time elapsed

       0.000000000 seconds user
       0.001615000 seconds sys


tough@localhost:/mnt/c/Users/nansh/Downloads$