valgrind 检测内存泄漏

Posted 2021-11-09 长虹剑

使用 libtorch 发现有内存泄漏问题

安装与下载

从 这里 下载

wget https://sourceware.org/pub/valgrind/valgrind-3.17.0.tar.bz2
tar -jxvf valgrind-3.17.0.tar.bz2
cd valgrind-3.17.0
mkdir _build
cd _build
../configure --prefix="xxxx" #[可选]
make -j
make install

使用

假设你有个要检查的程序为 vtts_test， 那么使用方法如下 （注意我把log 保存了，需要建立一个 文件夹）

valgrind --log-file="log/bin_dbg.txt" --tool=memcheck --leak-check=full  --show-reachable=yes ./vtts_test

#valgrind --log-file="log/bin_dbg.txt" --tool=memcheck --leak-check=yes --show-reachable=yes ./vtts_test
#valgrind --log-file="log/bin_dbg.txt" --tool=memcheck --error-limit=no --leak-check=full --show-reachable=yes ./vtts_test
#cuda-memcheck --save "log/bin_dbg_cuda.txt" --leak-check full --show-backtrace yes --racecheck-report all ./vtts_test

cuda-memcheck 这个提供了显存泄漏的查看示例方法， 其他参数 见此

结果显示

提供一段libtorch的代码

#include "torch/script.h"

#include <iostream>
#include <memory>
int main(int argc, const char* argv[]) {
    auto a = torch::ones(5, torch::kUInt8).to(at::kCUDA);
    return 0;
}

运行结果显示

==47744== LEAK SUMMARY:
==47744==    definitely lost: 160 bytes in 3 blocks
==47744==    indirectly lost: 4 bytes in 1 blocks
==47744==      possibly lost: 11,172,272 bytes in 82,370 blocks
==47744==    still reachable: 711,858,097 bytes in 737,239 blocks
==47744==         suppressed: 0 bytes in 0 blocks
==47744==
==47744== For lists of detected and suppressed errors, rerun with: -s
==47744== ERROR SUMMARY: 14530 errors from 1296 contexts (suppressed: 0 from 0)

不明白为什么会有泄漏，而且前面会提示一堆 mismatch