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I've read that it's better to use 32 bit JDK on 64 bit Ubuntu so I installed jdk-7u9-linux-i586.tar.gz there with libc6-i386 installed. When I run java -version the following info is printed:

java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) Server VM (build 23.5-b02, mixed mode)

Also I've read that Client VM is better than Server VM at development computer. How do I set Hotspot to Client mode?

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Andrei Botalov
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2 Answers2

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That may have been true 2 years ago, but 64-bit HotSpot works fine now, in development and in production, and has automatic pointer compression when you don't use a heap larger than around 24 GB.

As for the JIT mode, you select the server VM with -server (the default on most machines nowadays), and the client VM with -client.

Frank Pavageau
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If anything is going to work it will be adding the -client option to the java command line.

However, according to this page, client VMs are not available for some platforms ... so you might find that -client is not accepted. (The wording of the page does not make it entirely clear whether it is the instruction set of the hardware or the instruction set of the JDK / JRE that is critical ...)

Also I've read that Client VM is better than Server VM at development computer.

I think it depends on whether you are using an IDE, and / or on the size of your builds. For long builds and long IDE sessions, I'd expect a Server VM to be better.

Stephen C
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