too much mem cost when create a lot of thread?

[MagicGeeker]

in windows 10,create 10000 threads and each alloc 1000B,use too much memory.

#include "mimalloc.h"
#include <iostream>
#include <memory>
#include <thread>

using namespace std;

#if 0
#define my_malloc malloc
#define my_free free
#define my_realloc realloc
#else
#define my_malloc mi_malloc
#define my_free mi_free
#define my_realloc mi_realloc
#endif

const int N = 10 * 1000;
void *ptrs[N];

int main() {
  for (int i = 0; i < N; i++) {
    std::thread([i]() {
      ptrs[i] = my_malloc(1000);
      memset(ptrs[i], 0x11, 1000);
      std::this_thread::sleep_for(chrono::seconds(30));
      my_free(ptrs[i]);
    }).detach();
  }
  getchar();
}

malloc test:

mimalloc test:

if set N bigger,the program will crash:

PS D:\Codes\CMake\mimalloc_test\build> .\mimalloc_test.exe
mimalloc: warning: thread 0xa484d66000: commit error: start: 000002ED0C000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fbe000: mimalloc: warning: thread 0xa535fbc000: commit error: start: 000002ED10000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fc2000: commit error: start: 000002ED1C000000, csize: 0x200000, err: 1455
commit error: start: 000002ED14000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa484d6e000: commit error: start: 000002ED20000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa535fc8000: commit error: start: 000002ED28000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fd4000: commit error: start: 000002ED40000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fcc000: mimalloc: warning: thread 0xa606f08000: mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa535fd0000: commit error: start: 000002ED38000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fd2000: commit error: start: 000002ED3C000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fc0000: commit error: start: 000002ED18000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa535fd6000: mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa535fda000: commit error: start: 000002ED4C000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
commit error: start: 000002ED34000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa606efc000: mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: warning: thread 0xa535fca000: commit error: start: 000002ED2C000000, csize: 0x200000, err: 1455
commit error: start: 000002ED44000000, csize: 0x200000, err: 1455
mimalloc: warning: thread 0xa535fd8000: commit error: start: 000002ED48000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
commit error: start: 000002ED30000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
commit error: start: 000002ED24000000, csize: 0x200000, err: 1455
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
mimalloc: error: thread 0xa535e1a000: unable to allocate thread local heap metadata (6968 bytes)
mimalloc: assertion failed: at "D:\Codes\CMake\mimalloc_test\mimalloc\src\os.c":952, mi_os_commitx
  assertion: "err == 0"
libc++abi: terminating due to uncaught exception of type std::__1::system_error: thread constructor failed: Input/output error
PS D:\Codes\CMake\mimalloc_test\build>