topic Re: High CPU usage Nodejs Agent on linux in Splunk AppDynamics

High CPU usage Nodejs Agent on linux

CommunityUser — Tue, 16 Apr 2019 09:26:38 GMT

We embed the appdynamic nodejs agent in our nodejs service.

When disable appdynamics function, with 90 tps, our nodejs service CPU usage is 40%.

When enable appdynamics function, with 90 tps, our nodejs service CPU usage is 60%.

After follow the optimize steps from https://community.appdynamics.com/t5/Knowledge-Base/How-do-I-troubleshoot-high-CPU-usage/ta-p/23266, CPU usage still 60%, not any approvement!

Re: High CPU usage Nodejs Agent on linux

Kyle_Furlong — Tue, 16 Apr 2019 19:31:06 GMT

Hi Jesseka,

For Node.js, it is usually process snapshots which lead to the CPU overhead. You can find the settings to tweak this in this document: https://docs.appdynamics.com/display/PRO45/Node.js+Settings+Reference

maxProcessSnapshotsPerPeriod: Optional. The default is 2. The number of automatic process snapshots allowed in processSnapshotCountResetPeriodSeconds seconds.
processSnapshotCountResetPeriodSeconds: Optional, defaults to 60. Frequency, in seconds, at which the automatic process snapshot count is reset to 0.
autoSnapshotDurationSeconds: Optional, defaults to 10. Length, in seconds, of automatically-triggered process snapshots.

Regards,

Kyle

Re: High CPU usage Nodejs Agent on linux

CommunityUser — Wed, 17 Apr 2019 02:36:03 GMT

Re: High CPU usage Nodejs Agent on linux

CommunityUser — Wed, 17 Apr 2019 02:36:34 GMT

Hi Kyle,

Thanks for the reply!

We have tried adjust the three paramters(autoSnapshotDurationSeconds, processSnapshotCountResetPeriodSeconds, maxProcessSnapshotsPerPeriod), even set the alwaysAddEumMetadataInHttpHeaders to false for test, but still get the same result of high CPU usage .

Here is our Nodejs test code,

const appdynamics= require("appdynamics");

appdynamics.profile({
controllerHostName: appdynamicsConf.controllerHostName,
controllerPort: appdynamicsConf.controllerPort,
controllerSslEnabled: appdynamicsConf.controllerSslEnabled,
accountName: appdynamicsConf.accountName,
accountAccessKey: appdynamicsConf.accountAccessKey,
applicationName: appdynamicsConf.applicationName,
autoSnapshotDurationSeconds: 60,
processSnapshotCountResetPeriodSeconds: 120,
maxProcessSnapshotsPerPeriod: 1,
alwaysAddEumMetadataInHttpHeaders: false,
tierName: appdynamicsConf.tierName,
nodeName: os.hostname()
});

Regards!

Re: High CPU usage Nodejs Agent on linux

Kyle_Furlong — Wed, 17 Apr 2019 16:43:40 GMT

Please try autoSnapshotDurationSeconds: 10

Re: High CPU usage Nodejs Agent on linux

CommunityUser — Thu, 18 Apr 2019 09:21:32 GMT

Thanks!

We have tested the follow four scenarios with 90 tps , still get the same result.

scenarios 1: AppDynamics is disabled ---- nodejs agent CPU used 41%

scenarios 2: AppDynamics is enabled with default setting (processSnapshotCountResetPeriodSeconds: 60, maxProcessSnapshotsPerPeriod: 2, autoSnapshotDurationSeconds: 10 ) ---- nodejs agent CPU used 57%

scenarios 3: AppDynamics is enabled with special setting, (processSnapshotCountResetPeriodSeconds: 60, maxProcessSnapshotsPerPeriod: 10, autoSnapshotDurationSeconds: 6 ) ---- nodejs agent CPU used 61%

scenarios 4: AppDynamics is enabled with special setting (processSnapshotCountResetPeriodSeconds: 120, maxProcessSnapshotsPerPeriod: 1, autoSnapshotDurationSeconds: 10 ) --- nodejs agent CPU used 56%

regards!

Re: High CPU usage Nodejs Agent on linux

Umervali_Niyama — Tue, 14 May 2019 17:41:04 GMT

Is there any resolution for this?