CODEWITHSUNDEEP
javacommand-linejvmheap-memoryjstat
user252816
user252816

Reputation: 573

How to get current/max jvm heap utilization (single value) with jstat or other command-line based tool?

JConsole or J VisualVM show the maximum heap size and the current heap utilization. How can I get the same values, during the lifespan of an application, using a command-line based tool, such as jstat?

From the metrics that I collect with jstat -gc (S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT), how can I compute the (single value) heap utilization that is given by JConsole/Visual VM?

Upvotes: 2

Views: 1891

Answers (3)

SlamDunk
SlamDunk

Reputation: 1

If you have the jstat measurement results, you need to understand the Heap situation and the trend of GC occurrence. If you don't have the analysis tool, you can use the link below first.

https://visualgc.streamlit.app/Jstat_Analyzer

Upvotes: 0

nitzien
nitzien

Reputation: 1267

You may use some bash command along with jstat to get desired result. For example, following will give you Eden space utilized.

jstat -gc <PID> | sed -n 2p | awk '{ print $6; }'

Upvotes: 1

ck1
ck1

Reputation: 5443

Beyond using jstat or jps, what you're asking about is using a JMX client such as jmxterm, to access these metrics on the server. Another option would be to include Jolokia with the server application, which would expose MBeans on the server over HTTP, such that you could use cURL in a Bash script, for example.

Upvotes: 1

Related Questions