JDK Memory Allocation

[mr rupplin]

David.

Thanks.  Seems that you're right.

In the JDK9 stack they seem to have struck onto a different formula.  Let us know if you have that one too or also.

Kthxbye,

Mr. Rupplin

/sr software developer
________________________________
From: David Buck <david.buck at oracle.com>
Sent: Saturday, July 21, 2018 9:10 PM
To: mr rupplin
Cc: hotspot-gc-dev at openjdk.java.net
Subject: Re: JDK Memory Allocation

Hi Max!

Your question does not seem to be related to building OpenJDK, so I have
BCCed build-dev from the thread and added gc-dev. That said, I am not
sure any of the development lists are really an ideal place to ask
general "code walk through" questions.

If really necessary, memAllocator.cpp [0] would probably be as good a
place as any to start reading the source code. But unless you intend to
hack on the JVM itself, trying to read this source code may not be the
most productive use of your time. You may get a lot more out of reading
some of the wikis [1], blogs [2], and books [3][4] that cover the
HotSpot JVM in detail. Even if you ultimately chose to read the source
code directly, reading these other types of resources first should
really help you make better sense of what you see in the source code.

Cheers,
-Buck

[0]
http://hg.openjdk.java.net/jdk/jdk/file/b0fcf59be391/src/hotspot/share/gc/shared/memAllocator.cpp
[1] https://wiki.openjdk.java.net/display/HotSpot/Main
[2] https://shipilev.net/jvm-anatomy-park/
[3] https://www.goodreads.com/book/show/13227108-java-performance
[4] https://www.goodreads.com/book/show/23316035-java-performance-companion

On 2018/07/22 8:51, mr rupplin wrote:
> Having looked for some while at the OpenJDK source code I am unable to find where the memory allocation occurs.  I will be working very much with the JDK and would like to get a firm grasp on its underlying mechanisms.
>
> public class JustAsk
> {
>       public static void main(String...args)
>       {
>           for(int i=0; i<100; i++)
>           {
>              new JustAsk();
>           }
>       }
> }
>
> This doesn't seem to rely on any of the functions in the libjli nor of the jni.h.  So clearly where do we look for the handler here?
>
> Thanks,
>
> Your friend Max
>
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