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JoshFlag for United States of America

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One core on quad core system at 100% utilization

I have a server with two quad core cpu's and one of the cores is at 100% utilization. I have never seen this before on this server. When I check the task manager only one process has about 16% cpu usage. Around 89% is at system idle process.

How can I figure out what is causing this 100% utilization on one of the cores?
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dbsrv7.exe -  From what I know that is our Sybase Adaptive Server Anywhere.
I don't know if that is normal, I just never noticed it taking 100% usage of just one core like that before.
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Thanks for the good input. Another reboot fixed the issue. I will keep an eye on things.