Huge memory usage in Nonpaged Pool

Question

I have a one-year-old iMac with 8GB RAM running a bootcamped Windows 7 Ultimate 64 bit.

The following memory analysis with Sysinternals RamMap.exe leaves some questions open:

What could be the reason for the nearly 5 GB of memory in the Nonpaged Pool? How can I find out which driver is causing this huge memory usage?

Solution

Found it, you can add the column "NP Pool" to the "Processes" tab on Task Manager:

In my case, the culprit was Fling File Transfer, which has a serious memory leak. It was using more than 2 GB of the nonpaged memory pool before I restarted it. The above screenshot shows it after running for two minutes.

Bug report filed.

Comments

[Joe M]

Thanks so much for sharing that! Everything else I'd found online involved way too many steps. I much prefer your solution, which immediately revealed the guilty process.

[Jonnie B]

I'm glad that you found a solution, but note that, "the Non-paged pool area seen under RAMMAP is not the same as the non-paged pool usage observed from task manager." From: support.microsoft.com/kb/2762246

[cheesus]

Okay, maybe the numbers don't correspond one-to-one, but it surely helped my find the process which was responsible for the high NP memory usage.

[bradvido]

I have Nonpaged Pool of 4GB in RamMap and the largest NP Pool in Task Manger is 1MB. What now?

[cheesus]

You have to show all users' tasks in Task Manager. See cdn-static.zdnet.com/i/story/60/34/000437/…