Startup impact of application insight on microservices startup

[Sachin1O1]

What's the minimum / maximum startup impact of application insight on microservices startups?

[Sachin1O1]

any update?

[trask]

hi @Sachin1O1, it depends a lot on the application and the compute resources. there's also additional overhead on Java 8 because the agent jar is signed, and the Java JIT compiler is not activated until later on in the startup process on Java 8 (this is not an issue on Java 11).

[Sachin1O1]

Hi @trask , I have some stats on how my service startup time is impacted by the application insight jar

Service startup sample

Sr no	With jar	Without jar
1	260.21	102.6
2	170	103
3	274	180
4	165	99

Container resources

resources:
limits:
cpu: 300m
memory: 700Mi
requests:
cpu: 100m
memory: 400Mi

Java

Java 11 (OpenJ9)

As you can see it inc startup time by almost X2

[heyams]

I'm curious to know which version of agent were you testing against? Did you try the latest GA/BETA version?

[Sachin1O1]

Hi @heyams,

I am using Application Insights Java 3.2.4 (GA)

[Sachin1O1]

@trask @heyams any update on this.

[heyams]

i'm working on a debug startup profiler.. so that you can provide thread dump to us for further debugging. we're not able to repro it.

[heyams]

@Sachin1O1 can you use this 3.2.6-BETA-SNAPSHOT and help us collect thread dump from your app?

Please set -Dapplicationinsights.debug.startupProfiling to true in your jvm arguments:
java -javaagent:applicationinsights-agent-3.2.6-BETA-SNAPSHOT.jar -Dapplicationinsights.debug.startupProfiling=true.

Let it run till your app has started. Then send me (helen.yang@microsoft.com) the file called stacktrace.txt located in your temp folder. The full path is available in the applicationinsights.log. Something like C:\Users\${USER-NAME}\AppData\Local\Temp\applicationinsights

[heyams]

@Sachin1O1 i updated the snapshot link above. earlier version was no good. please give it a try and get back to us when you can. thanks.

[Sachin1O1]

@heyams Thanks for the profiler. I will update you with the relevant data ASAP. :)