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Editorial Team
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Asked: 2026-06-17T09:03:30+00:00

We are running a windows service which every 5 seconds checks a folder for

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We are running a windows service which every 5 seconds checks a folder for files and if found logs some info about it using NLog.

I already tried the suggestions from ASP.NET: High CPU usage under no load without succes.

When the service was just started there is hardly any CPU usage. After a few hours we see CPU peaks to 100% and after some more waiting the cpu graph looks like:

windows task manager

I tried the steps described in http://blogs.technet.com/b/sooraj-sec/archive/2011/09/14/collecting-data-using-xperf-for-high-cpu-utilization-of-a-process.aspx to produce information on what is going on:

xperf overview

I don’t know where to continue. Any help appreciated

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1 Answer

  1. Editorial Team

    After a lot of digging it had to do with this:

    The service had a private object X with property Y

    Every time the service was fired X was passed to the Business Logic. There Y was used and in the end disposed. The garbage collector will then wait until X is disposed, which will never happen until the service is restarted. This caused an extra GC waiting thread every time the service was fired.

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