November 2017
Intermediate to advanced
398 pages
10h 14m
English
Content preview from Java 9 High Performance
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How to collect heap dump
A heap dump can be generated either manually or through automated processes. To do so manually, you can execute the following command:
sudo -u <username> jmap -dump:file=headdump.hdprof,format=b <pid>
Taking the preceding command as an example, you need to make sure that the relevant process ID is used in place of the pid, as shown previously. Also, the process owner should be replaced with the user to ensure the correct instructions. Otherwise, you will not be able to generate a valid heap dump.
To generate heap dumps using automated processes, you will need to use either the JRockiet R28+ or the HotSpot Java VM 1.5+ and include the parameter shown as follows:
-XX:+HeapDumpOnOutOfMemoryError
This will cause the Java ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.