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" stackoverflow.com/questions/12807797/java-get-available-memory — Stefan Falk
– Stefan Falk, Commented Dec 3, 2014 at 11:08

Evgeniy Dorofeev · Accepted Answer · 2014-12-03 13:23:29Z

1

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

answered Dec 3, 2014 at 13:23

Evgeniy Dorofeev

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