出现因内存泄漏和应用程序内存溢出保持运行和分配 [英] Get memory overflow caused by a memory leak and the application keep running and allocating
本文介绍了出现因内存泄漏和应用程序内存溢出保持运行和分配的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我开发了一个内存泄漏压力的小应用程序：
I developed a small application for a memory leak stress:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
int period = 0;
int size = 40000001;
char *buf = NULL;
if (argc > 1) period = atoi(argv[1]);
if (period == 0) period = 21;
for (;;) {
buf = malloc(size);
if (buf == NULL) printf ("malloc return NULL\n");
sleep(period);
}
return 0;
}
有关申请作出40M的〜内存分配（不收费），每20秒。我的系统内存为256M〜
the application make a memory allocation (without free) of ~40M every 20 second. my system memory is ~256M.
我检查的应力应用与top命令消耗的内存：
I checked the memory consumed by the stress application with the top command:
$top | grep "stress"
873 5689 root S 39892 16% 0% ./stress_test
873 5689 root S 39892 16% 0% ./stress_test
873 5689 root S 39892 16% 0% ./stress_test
873 5689 root S 78956 31% 0% ./stress_test
873 5689 root S 78956 31% 0% ./stress_test
873 5689 root S 78956 31% 0% ./stress_test
873 5689 root S 78956 31% 0% ./stress_test
873 5689 root S 78956 31% 0% ./stress_test
873 5689 root S 115m 47% 0% ./stress_test
873 5689 root S 115m 47% 0% ./stress_test
873 5689 root S 115m 47% 0% ./stress_test
873 5689 root S 115m 47% 0% ./stress_test
873 5689 root S 153m 62% 0% ./stress_test
873 5689 root S 153m 62% 0% ./stress_test
873 5689 root S 153m 62% 0% ./stress_test
1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 153m 62% 0% ./stress_test
873 5689 root S 191m 77% 0% ./stress_test
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1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 382m 155% 0% ./stress_test
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873 5689 root S 420m 170% 0% ./stress_test
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873 5689 root S 458m 185% 0% ./stress_test
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1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 573m 232% 0% ./stress_test
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873 5689 root S 725m 293% 0% ./stress_test
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873 5689 root S 763m 309% 0% ./stress_test
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873 5689 root S 801m 324% 0% ./stress_test
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873 5689 root S 840m 340% 0% ./stress_test
873 5689 root S 840m 340% 0% ./stress_test
1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 840m 340% 0% ./stress_test
1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 840m 340% 0% ./stress_test
Mem: 120004K used, 132592K free, 0K shrd, 0K buff, 30076K cached
873 5689 root S 878m 355% 0% ./stress_test
873 5689 root S 878m 355% 0% ./stress_test
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873 5689 root S 916m 370% 0% ./stress_test
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1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 992m 401% 0% ./stress_test
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1061 5689 root S 1564 1% 0% grep stress
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1061 5689 root S 1564 1% 0% grep stress
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1061 5689 root S 1564 1% 0% grep stress
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1061 5689 root S 1564 1% 0% grep stress
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873 5689 root S 1984m 802% 0% ./stress_test
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1061 5689 root S 1564 1% 0% grep stress
873 5689 root S 1984m 802% 0% ./stress_test
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873 5689 root S 1984m 802% 0% ./stress_test
的
the forth column is the memory consumed by the application and the 5th column is the memory consumed by the application in percent
因此，在存储器使用的应力应用的增长和到达值比存储器大小大：1984M（存储器802％）和该应用程序保持运行并分配whenthe消耗的内存是> 100％。但它停止分配并继续运行，当它reachs
So the stress application growth in the memory usage and reach values bigger than the memory size: 1984M (802 % of the memory) and the application keep running and allocating whenthe consumed memory is > 100%. But it stops allocating and keep running when it reachs
28308 5682 root S 2022m 818% 0% ./stress_test
我希望我的应用程序停止分配，当它达到100％。
I expected that my application stop allocating when it reached 100%.
你能解释这种现象？
推荐答案
为什么你会希望它撞车？如果无法分配，的malloc（）只返回 NULL 。
Why would you expect it to "crash"? If it fails to allocate, malloc() just returns NULL.
另外请注意，许多现代的操作系统（如Linux）通常过量内存，而且由于你的code从不真正的使用的分配的内存，它可以由一个很大的可能是这样做的运行的虚拟空间，并迫使前的malloc（）失败。为什么你看到使用更多的内存比你的程序是用这是可能的。
Also, note that many modern operating systems (like Linux) typically overcommit the memory, and since your code never actually uses the allocated memory, it can probably do so by a great deal before running out of virtual space and forcing malloc() to fail. This is likely why you see your program using more RAM than is available.
当然，你没有说你有多大的交换有，这也将影响会发生什么，因为即使你特定的操作系统并不过量使用，它很可能使用交换。
Of course, you failed to say how much swap you have, which will also affect what happens since even if you particular OS doesn't overcommit, it very likely uses swap.
这篇关于出现因内存泄漏和应用程序内存溢出保持运行和分配的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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