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My C++11 application run for days without reboot to perform fluid simulation. After running it for 6days, this is the memory footprint: RSS 54MB VSZ 5.6GB Why virtual memory increased to 5.6GB? There is no memory leak in my application. Application is multi-threaded, and heavily uses STL.

user3059007
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    Do you want to have VSZ and RSS explained? If so, I expect [Does it make sense to use VSZ from the ps command to monitor memory of processes on a Redhat server?](https://serverfault.com/q/825611/126632) will answer your question. The fact that your program is only using 54MB of RAM does not seem to be a significant concern. – Michael Hampton Apr 18 '18 at 02:00
  • @Michael thanks for your comment. I partially got my answer. I am still did not get it why Centos is keeping of already used memory information in VSZ. – user3059007 Apr 18 '18 at 02:57
  • Could there be an allocation leak where you forgot to unlink or unmap? Maybe monitor the VSZ increase and check with lsof? You can also check `/proc//smaps` – Tux_DEV_NULL Apr 18 '18 at 07:15
  • I checked /proc//smaps but did not find any leaks. Also, if there is any memory leak than RSS size should also grow. But RSS size remains same. – user3059007 Apr 18 '18 at 18:38

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