DropWizard performance and logging
I’ve been examining the performance of my project’s DropWizard microservices. If you set the default loglevel to debug, DropWizard is very chatty – which is not good for performance. Using Gatling to locally stress-test the service (eg both Gatling and the service were running on the same machine), I was getting 21k requests fulfilled over 10 minutes. A minor change to the log levels increased this from 21k to 113k requests fulfilled.
So before
================================================================================
2014-02-10 15:04:02 619s elapsed
---- Load parallel -------------------------------------------------------------
Users : [#################################################################]100%
waiting:0 / running:0 / done:100
---- Requests ------------------------------------------------------------------
> Global OK=25873 KO=4210
> Realtime interface OK=25873 KO=4210
================================================================================
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Changing the log levels in your config.yaml file
http:
requestLog:
console:
# On a server, nobody is attached to STDOUT anyway
enabled: false
logging:
loggers:
# Stop the DropWizard chatty bits
org.eclipse.jetty: WARN
org.apache.http: WARN
com.yammer.metrics: WARN
console:
# Again, nobody can hear STDOUT on a server
enabled: false
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logging:
loggers:
# Stop the DropWizard chatty bits
org.eclipse.jetty: WARN
org.apache.http: WARN
com.yammer.metrics: WARN
console:
# Again, nobody can hear STDOUT on a server
enabled: false
resulted in the following improvement
================================================================================
2014-02-10 15:19:04 610s elapsed
---- Load parallel -------------------------------------------------------------
Users : [#################################################################]100%
waiting:0 / running:0 / done:100
---- Requests ------------------------------------------------------------------
> Global OK=113011 KO=264
> Realtime interface OK=113011 KO=264
================================================================================
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