Calculate amount of available heap memory in Java

Question

I have the following details of a Java process (WildFly application server):

 "heap-memory-usage" => {
            "init" => 536870912L,
            "used" => 73683328L,
            "committed" => 505413632L,
            "max" => 1908932608L
        }

I need to create an alert when the amount of free memory drops under a certain level. Is it correct to assume that the heap available memory equals to (max - used) ? or should I use (max - committed) ?
Thanks

google "*java get free memory*" http://stackoverflow.com/questions/12807797/java-get-available-memory — Stefan Falk, Dec 03 '14 at 11:08
http://stackoverflow.com/questions/206847/exact-state-of-committed-memory-in-java — Stijn Geukens, Dec 03 '14 at 11:12

score 1 · Accepted Answer · answered Dec 03 '14 at 13:23

1

You should use max - used. See java.lang.management.MemoryUsage class API for details

answered Dec 03 '14 at 13:23

Evgeniy Dorofeev

124,221
27
187
258

Calculate amount of available heap memory in Java

1 Answers1