memory-use measurement

[Reiner Funck]

Hallo,

my memory-use measurement for a Java-process (Java 1.5)
shows 170000 Bytes.
(memoryuse = Runtime.totalMemory() - Runtime.freeMemory())

The simultaneously measurement with ps shows 64000 Bytes.
(Suse 9.1, kernel 2.6.4)

What is wrong?

Many thanks for help
Reiner

 

[Chris Smith]

my memory-use measurement for a Java-process (Java 1.5)
shows 170000 Bytes.
(memoryuse = Runtime.totalMemory() - Runtime.freeMemory())

The simultaneously measurement with ps shows 64000 Bytes.
(Suse 9.1, kernel 2.6.4)

What is wrong?

Perhaps nothing. The first bit of code measures the size of the used
heap. The second could be any number of things, depending on what
column of the ps output you're reading. If you're looking at physical
RAM in ps, for example, then the discrepancy could come from part of the
heap being paged out at the moment.

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation