Focus on what’s important

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Memory Management Analysis

Why we built Censum

• We needed to analyse Java’s automated memory management system (aka GC)

– Existing tools lacked depth – The data is very difficult to obtain and interpret !

• Poorly tuned GC kills performance – Leading cause of poor performance for Java applications – Can prevent your users from using your application!

Why Censum is different!

• Lightweight – Data gathered by Censum is cheap to obtain !

• Intelligent – Censum offers analytics over raw data !

• Adaptive – Censum supports multiple versions of Java and it’s collectors !

• Pervasive – Fills the the vital GC piece of the overall performance picture

A sample of the GC issues that we find

Category Bottleneck Description

High Pause Times Shows you high pause times due to Garbage Collection (GC)

Too much time in GC Shows you if your application not progressing due to GC

Running out of memory Shows you if your application is memory starved

Premature Promotion Shows you if you are promoting objects to the wrong region

PermGen space Shows you a clear info graphic on your PermGen usage.

Incorrectly size pools Recommends the optimal memory pool sizes

System GCs Shows you harmful uses of System GCs

Memory Efficiency Shows you how quickly you are burning through memory

Probable memory leaks Indicators of probable memory leaks

Some technical & licensing details

• Java Swing Desktop tool – Runs on any major O/S – Runs on Java 6u10+ – Trivial to install !

• Parses almost any GC log – ‘Heroic’ mode – Tested against massive database of real PRD logs !

• Flexible licensing – Per user / desktop license OR – Floating concurrent users license – Free upgrades throughout the year

Sample Analysis Summary

Sample Log Summary

Sample Graphic - Too many System GC’s

Censum Roadmap

• Q3 2014 - G1 & Java 8 Support !

• Q4 2014 - Censum Hosted / SaaS – Phase 1 - Build and CI Server integration – Phase 2 - Streams GC log data to a central service – Phase 3 - Real Time monitoring and analysis !

• 2015+ - Extensive Roadmap – Modern UI refresh – Further depth in analytics – Predictive mode, detect issues before they occur – Capacity planning – PaaS and IDE integrations

Focus on what’s important !

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