On Tue, Mar 15, 2011 at 4:20 AM, Caldarale, Charles R
chuck.caldar...@unisys.com wrote:
From: Leon Rosenberg [mailto:rosenberg.l...@gmail.com]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
I'm sorry, I probably missed something, but why should 64 bit app on
64
On 15 March 2011 07:36, Leon Rosenberg rosenberg.l...@gmail.com wrote:
So a 64bit cpu has a 32bit mode, or how would a 32bit OS shrink the
transmit size? I mean the registers stay the same?
Frequently, the bottleneck with realistic loads is access to main memory
(or, not quite equivalently,
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
A 32-bit process, using 32-bit pointers, will enjoy a 2x speedup for
those types of data.
Also, a Java int, when allocated on the stack, must take up
On 15 March 2011 13:02, Caldarale, Charles R chuck.caldar...@unisys.comwrote:
Also, a Java int, when allocated on the stack, must take up the same number
of bits as a pointer.
That's an interesting space/time trade-off (I presume it's to prevent
excess arithmetic on stack value accesses). I
From: peter.crowth...@googlemail.com [mailto:peter.crowth...@googlemail.com]
On Behalf Of Peter Crowther
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
Also, a Java int, when allocated on the stack, must take up the same number
of bits as a pointer.
That's
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Chuck,
On 3/15/2011 9:02 AM, Caldarale, Charles R wrote:
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
A 32-bit process, using 32-bit pointers
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Chuck,
On 3/14/2011 11:20 PM, Caldarale, Charles R wrote:
From: Leon Rosenberg [mailto:rosenberg.l...@gmail.com]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
I'm sorry, I probably missed something, but why should
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
So, back to the original question: will a 32-bit JVM on a 64-bit OS give
me a bigger heap potential than a 32-bit JVM on a 32-bit OS?
Depends entirely
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
A Java int is defined to be 32-bits. Why would it have to be word-length
on the stack? Is that documented anywhere, or does it just end up being
On 3/14/2011 1:01 PM, Christopher Schultz wrote:
...
We are going into a production upgrade cycle and I'd like to plan for
the OS type: if we get no benefit from running a 64-bit OS then I won't
bother installing one.
If you're using windows server machines, Server 2008 R2 (and maybe
Server
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David,
On 3/14/2011 1:22 PM, David kerber wrote:
On 3/14/2011 1:01 PM, Christopher Schultz wrote:
...
We are going into a production upgrade cycle and I'd like to plan for
the OS type: if we get no benefit from running a 64-bit OS then I
On 3/14/2011 1:31 PM, Christopher Schultz wrote:
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David,
On 3/14/2011 1:22 PM, David kerber wrote:
On 3/14/2011 1:01 PM, Christopher Schultz wrote:
...
We are going into a production upgrade cycle and I'd like to plan for
the OS type: if we get
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David,
On 3/14/2011 1:36 PM, David kerber wrote:
On 3/14/2011 1:31 PM, Christopher Schultz wrote:
I should have mentioned, we are in a Linux environment, so we have lots
of options. ;)
Lucky you; I wish I could say the same...
You should
I'm sorry, I probably missed something, but why should 64 bit app on
64 bit os on 64 bit cpu be slower as 32 bit analog?
regards
Leon
On Mon, Mar 14, 2011 at 6:45 PM, Christopher Schultz
ch...@christopherschultz.net wrote:
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David,
On 3/14/2011
To: Tomcat Users Listusers@tomcat.apache.org
Reply-To: Tomcat Users List users@tomcat.apache.org
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
I'm sorry, I probably missed something, but why should 64 bit app on
64 bit os on 64 bit cpu be slower as 32 bit analog
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Justin,
On 3/14/2011 3:45 PM, Justin Randall wrote:
In general, it is technically possible for a 32-bit application to
perform faster than a 64-bit application when running on a 64-bit CPU
because of CPU memory cache behaviour.
Also due to the
-bit versus 64-bit performance discussion(s)
Sent: Mar 14, 2011 17:08
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Justin,
On 3/14/2011 3:45 PM, Justin Randall wrote:
In general, it is technically possible for a 32-bit application to
perform faster than a 64-bit application when running on a 64
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Justin,
On 3/14/2011 5:44 PM, Justin Randall wrote:
It really makes you wonder why caches and pipelines weren't scaled more
proportionally.
Not to mention memory sizes in general. We got a 2^32-fold increase in
addressable memory. Great. Where is
From: Leon Rosenberg [mailto:rosenberg.l...@gmail.com]
Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
I'm sorry, I probably missed something, but why should 64 bit app on
64 bit os on 64 bit cpu be slower as 32 bit analog?
Because all the data items are bigger
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