1. Jmxmon Introduction

Jmxmon is a jmx monitor module based on Open-falcon. Along with the agent of open-falcon, it can collect the service state of any java process whose JMX service port is open and push the collected data to the service of Open-falcon.

1.1. Main Feature

Collecting jvm information of java process through jmx, including gc time consuming, gc frequency, gc throughput, utilization rate of old generation, size of new generation promotion, active threads and etc.。

It does not hack the code of programm and cost little resources in the system.

1.2. Collected Metrics

Counters	Type	Notes
parnew.gc.avg.time	GAUGE	average time consuming of each YoungGC(parnew) in a minute
concurrentmarksweep.gc.avg.time	GAUGE	average time consuming of each CMSGC in a minute
parnew.gc.count	GAUGE	counter of the YoungGC(parnew) in a minute
concurrentmarksweep.gc.count	GAUGE	ounter of the CMSGC in a minute
gc.throughput	GAUGE	total traffic ratio of GC (application running time/process total running time）
new.gen.promotion	GAUGE	size of the new generation memory promotion in a minute
new.gen.avg.promotion	GAUGE	average size of all new generation memory promotion in a minute
old.gen.mem.used	GAUGE	memory usage of old generation老年代的内存使用量
old.gen.mem.ratio	GAUGE	memory usage percentage of old generation
thread.active.count	GAUGE	number of currently active thread
thread.peak.count	GAUGE	peak number of thread

1.3. Recommended Metrics in Monitor Alarm

The alarm metric and the threshold can be congifured flexibility according to their different features.

Metric	Condition	Note
gc.throughput	all(#3)<98	gc thtoughput rate stays below 98% will affect the performance
old.gen.mem.ratio	all(#3)>90	it needs to be optimized that the old generation memory usage 10 over 90%
thread.active.count	all(#3)>500	too many threads will affect the performance

2. Help

Please visit jmxmon for more detailed instruction.