High CPU usage Nodejs Agent on linux

[CommunityUser]

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!

[Kyle_Furlong]

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

[CommunityUser]

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!

[Kyle_Furlong]

Please try autoSnapshotDurationSeconds: 10

[CommunityUser]

 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!

[Umervali_Niyama]

Is there any resolution for this?