Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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Overall CPU percent usage is fairly higher than the percent usage of all sites running on the same app service plan
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Fatima Rahman
5
Reputation points
I am inspecting CPU Drill down graph for function apps and noticed that Overall CPU percent usage is fairly higher than percent usage of function apps that run on the same app service plan:
My assumption is that if an app has large number of I/O bound or CPU intensive tasks, it should be included as part of the per-app-usage graph. Then as per this graph my function apps aren't causing the cpu drill here.
What could be the possible reason for such high overall CPU usage? Are the background processes that are run by azure to ensure site's health and updates impacting the app service plan?
Azure Functions
Azure App Service
Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 93%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBG%3C/text%3E%3C/svg%3E)
Ben Gimblett 4,560 Reputation points Microsoft Employee2024-01-10T11:42:18.8566667+00:00 Hi @Fatima Rahman thanks for the question. It could be possible a background process is causing high cpu usage. That would be something support would need to look at. In the interim did you try the "diagnose and solve problems" wizard? The plugins here use some of the same data available to our support team and typically provides far more info than the metrics alone. There's a walkthrough for app service here https://azure.github.io/AppService/2020/10/05/Diagnose-App-with-High-CPU.html but it's very similar to functions https://learn.microsoft.com/en-us/azure/app-service/overview-diagnostics#open-app-service-diagnostics
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Fatima Rahman 5 Reputation points
2024-01-10T14:17:05.8066667+00:00 Hey @Ben Gimblett , the graph that I have posted is from "diagnose and solve problems" wizard actually. And it provides me no additional insight as to why CPU percentage usage is higher than all the function apps percentage cpu usage.
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Ben Gimblett 4,560 Reputation points Microsoft Employee
2024-01-10T14:46:26.3+00:00 Sorry to hear that. I think in this situation you would need to follow the support route as the information required would likely not be directly accessible. I know support colleagues also monitor this forum too. Are you able to raise a support request?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 10%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMM%3C/text%3E%3C/svg%3E)
MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator2024-01-12T14:15:11.94+00:00 Fatima Rahman If you don't have a support plan and requiring assistance, let us know.
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Fatima Rahman 5 Reputation points
2024-01-12T14:18:11.8033333+00:00 @Ben Gimblett I'll be posting a cloud consult request for this. Thanks
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