AppDynamics showing delayed execution of API.

Samarendu Saha 0

I had developed a REST API (Let API1) which in turn calls third party (PROS) API. It seems is working correctly and application logs show correct response received from the third partyAPI and within one second. But the AppDynamics some time show sleep of approximate of 120 second. When we drill down the issue to check time taken by individual method/process it shows System.Threading.Thread.SleepInternal taking 120 second. What can be reason for this issue. All calls and methods are async call only. User's image

Jack J Jun 24,496 Reputation points Microsoft Vendor

2023-04-21T08:50:07.11+00:00

@Samarendu Saha, Welcome to Microsoft Q&A, there are many reasons to cause System.Threading.Thread.SleepInternal to take 120 seconds. a. Your program called the SleepInternal method many times. b. Your program may perform blocking operations(such as I/O), which may cause delays in the execution of the SleepInternal method. BTW, how do you add the reference about SleepInternal method? Based on my test, I could not use that method. Also, could you provide some code about SleepInternal?
Samarendu Saha 0 Reputation points

2023-04-24T10:52:19.9433333+00:00

Thanks @Jack J Jun for quick response. Method code never calls sleep method. Interesting part is that my application logs showing response is received within one second. Here the problem is that monitering application is showing 120 second.
Jack J Jun 24,496 Reputation points Microsoft Vendor

2023-04-25T08:43:01.15+00:00

@Samarendu Saha, thanks for the feedback, I recommend that you use PerfView tool to investigate performance issues in code written for the .NET runtime. You could read the following videos from the following link: https://learn.microsoft.com/en-us/shows/perfview-tutorial/

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AppDynamics showing delayed execution of API.