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Scailing Java Applications
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Christopher Frost
When deploying a Java application to Cloud Foundry the Java memory settings
for the application are decided based on the configured memory weighting during staging. This means that, unlike other apps, if the application is scaled to give it more memory it needs to be *restage*d it to get updated Java memory settings. This has now been improved with an improved memory calculator written by Steve Powell[2]. The Memory Calculator[1] will be run during every application start to ensure the application gets up-to-date memory settings, its output is shown during staging. -----> Downloading Open JDK Like Memory Calculator 1.1.1_RELEASE from https://download.run.pivotal.io/memory-calculator/trusty/x86_64/memory-calculator-1.1.1_RELEASE (found in cache) Memory Settings: -XX:MaxMetaspaceSize=64M -XX:MetaspaceSize=64M -Xss995K -Xmx382293K -Xms382293K Then scaling the application to double the memory will result in new memory settings without having to restage the application. cf scale my-application -m 1G -Xmx768M -Xms768M -XX:MaxMetaspaceSize=104857K -XX:MetaspaceSize=104857K -Xss1M This new feature is currently available on the master branch of the buildpack [3] and will be released in due course. Chris. [1] https://github.com/cloudfoundry/java-buildpack-memory-calculator [2] https://github.com/Zteve [3] https://github.com/cloudfoundry/java-buildpack -- Christopher Frost - Pivotal UK |
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James Bayer
thanks steve! that's a nice addition to the java buildpack. i think all
java developers have experienced the pain of managing memory explicitly with -X and -XX args at one point or another. having built-in sane defaults that auto-adjust is hopefully one less thing java developers have to worry about when using the java buildpack. On Tue, May 12, 2015 at 8:12 AM, Christopher Frost <cfrost(a)pivotal.io> wrote:
-- Thank you, James Bayer |
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Mike Youngstrom <youngm@...>
Love this feature! Thanks JBP team!
Now I have to try really hard to find something in the JBP to complain about. :) Mike On Tue, May 12, 2015 at 9:12 AM, Christopher Frost <cfrost(a)pivotal.io> wrote:
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