topic Re: AIX - Server TPS and response time are affected, After installed OneAgent in Open Q&A

AIX - Server TPS and response time are affected, After installed OneAgent

Jacky_Nguyen — Tue, 07 Nov 2023 11:18:54 GMT

We installed OneAgent on the customer's AIX 7.2 server and they reported to us the server's TPS and response time were affected (Server TP and response time lowered by about 20% after installing OneAgent).

We show the CPU and RAM, that OneAgent consumed during testing time. It showed normal values (not too high)

Has anyone faced with this issue? Or any advice for debugging this issue?

Thanks for your support!

Re: AIX - Server TPS and response time are affected, After installed OneAgent

radek_jasinski — Tue, 31 Oct 2023 07:06:44 GMT

Hi @Jacky_Nguyen

I understand that during the tests OneAgent did not affect the server performance? Please write whether the load is constant or persists for a few minutes after startup? (This situation can occur as the first instrumentation is performed by OA).

As a first step, switch OA to infra-only mode and let us know if the load has decreased:
https://docs.dynatrace.com/docs/platform-modules/infrastructure-monitoring/hosts/basic-concepts/get-started-with-infrastructure-monitoring

Radek

Re: AIX - Server TPS and response time are affected, After installed OneAgent

Jacky_Nguyen — Wed, 01 Nov 2023 02:25:57 GMT

Hi @radek_jasinski,

Thanks for your support. I tested following your suggestion with both modes: Fullstack & Infrastructure. Below about the test results:

- How we test: We generated requests from the testing machine to Monitored host server (AIX) in 15 minutes.

- About CPU/RAM/Memory/Network: In both cases, there was no big difference.

- About Server TPS and Response time: Fullstack mode increased by 18%-20% response time, compared with Infrastructure mode.

Do you have any advice for optimizing OneAgent in full-stack mode to fix the response time issue?

Thanks in advance,

Jacky_Nguyen

Re: AIX - Server TPS and response time are affected, After installed OneAgent

radek_jasinski — Wed, 01 Nov 2023 12:35:26 GMT

Hi @Jacky_Nguyen

When Full-Stack mode causes an overhead problem, there can be many causes. Probably ie it is some interference on the side of source code instrumentation. It could be some specific setting of your application or version.

I have two more questions:

What technology are you using on your application?
Was the tested application in the same technology and technology version?

In general, at the same time I recommend creating a ticket in support, as you may need to exclude specific items on the DT side or your application.

Here's also some information on how OA can affect the overhead: https://community.dynatrace.com/t5/Open-Q-A/How-much-overhead-does-the-oneagent-take/m-p/27422

Radek