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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » is Broker 6.1 64 or 32 bit

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is Broker 6.1 64 or 32 bit

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rbicheno

Posted: Thu Jul 16, 2009 7:55 am Post subject:

Apprentice

Joined: 07 Jul 2009
Posts: 43

here is the topic i mentioned:
http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r1m0/topic/com.ibm.etools.mft.doc/ae00270_.htm

dcjs

Posted: Mon Jul 20, 2009 4:03 pm Post subject:

Acolyte

Joined: 10 Nov 2006
Posts: 53
Location: IBM Bangalore

Whats the advantage of using a 64 bit execution group. I believe 64 bit need more memory and CPU.
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smdavies99

Posted: Mon Jul 20, 2009 9:36 pm Post subject:

Jedi Council

Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.

Code being executed in 64bit mode on a 64bit machine will not require more CPU that 32bit code running on the same machine.
I'd be interested to know where that idea came from.

From my experience 64bit binaries are bigger than 32bit ones but this is more than offset by the fact that 64bit O/S's (in general) can address a huge memory space whereas 32bit O/S is limited to 4Gb of Physical memory addressing. Just look at how much memory is usable by Windows(32bit) when installed on a system with 4GB of RAM. This is typically 3.5Gb. The rest is used to address peripherals.
Then the per process address space (certainly on Windows) is limited to 2Gb. This limitation does not exist on 64bit systems.
If you are processing large messages (say >100Mb) it would be very easy to exceed this and cause a crash if you are using 32bit.
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