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Re: Java Generics broken beyond repair?

Subject: Re: Java Generics broken beyond repair?
From: "Aeon B. C. Lee" <email@hidden>
Date: Wed, 13 Dec 2006 14:18:53 -0500
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JNI is a PITA for cross-platform, you might as well code the whole thing in C/C++.

It's easy to increase Java heap size, but then speed will drop once memory usage hits certain level. So far I have managed to reduce memory and increase speed many times by avoiding the Java Collection Framework and writing my own.

Aeon

On Dec 13, 2006, at 1:18 PM, Paul J. Lucas wrote:

On Dec 13, 2006, at 10:02 AM, Aeon B. C. Lee wrote:
I am writing some compression algorithms for huge data sets that have to be as fast and compact as possible, and Java Generics is simply too damn wasteful in memory usage.
Have you considered writing the code in C or C++ via JNI? Using native memory for data means you're not limited by Java's heap size either. We've (my company and I) have been doing this in our product and it works.

We allocate native blocks using vm_allocate() (under Mac OS X). Although it may not apply to your case, we then wrap the native blocks in a direct ByteBuffer (allocated using native code via env- >NewDirectByteBuffer()) and can pass this back to Java. (Of course it helps in our case that our data is naturally "block-ified" being the blocks represent tiles of an image.)
- Paul
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Follow-Ups:
- Re: Java Generics broken beyond repair?
  - From: "Paul J. Lucas" <email@hidden>

References:
	>Java Generics broken beyond repair? (From: "Aeon B. C. Lee" <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: Jerry <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: "Aeon B. C. Lee" <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: "Aeon B. C. Lee" <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: DrAnonymous <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: "Aeon B. C. Lee" <email@hidden>)
	>Re: Java Generics broken beyond repair? (From: "Paul J. Lucas" <email@hidden>)

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