thanks for the clarifications.

ronatartifact wrote:
>
> If you read the references that I posted, you will see when 32 bit is
> faster than 64 bit.
> You are not the first guy to ask the question so Microsoft did a pretty
> nice test.
>
> Why is no major hardware vendor selling 32 bit servers for business
> applications? If 32 bit was faster, cheaper and they already have lots
> of chips and manufacturing infrastructure, the guy selling 32 bit
> servers would be killing the rest of the vendors in sales and profits.
> HP is not going to spend billions to put out a product line that can not
> compete with IBM's old servers and is slower than HP's existing products.
>
>
> Mohan2005 wrote:
>> Hello:
>>
>> we also wish to convert out 32bit dual cores to 64bit dual cores to run
>> java
>> applications (multiple instances with large JVM memory)
>> but people advice that 64bit are 20 - 30% slower than the 32bit with
>> smaller
>> JVM.
>> why? and if true how to overcome??
>>
>> thanks
>>
>>  
>
> Just ignore the these people. They are talking through their hats or
> about some weird example that does not reflect servlet engine
> performance except at low volumes. There is some overhead in handling
> big address spaces.
> Everyone knows that it takes a lot longer to format a 320Gb drive than
> an 80 GB drive but if you could get either for the same price, you would
> take the big drive MOST of the time.
> Anyone who buys a dedicated server with 4 GB of memory to run Tomcat
> under 32 bit Windows OS where the space available is only 2GB, is being
> silly. If you want to go past 2GB, you need to be fully 64bit compatible
> right up through the whole stack.
> You do need to run a 64 bit OS and a 64 bit JVM to get the advantages of
> 64 bit memory addressing capability.
>
> The Microsoft study used Websphere which I understand to be very close
> to Tomcat.
>
> If this were not a Tomcat forum but was oriented to engineering
> simulations, we would be carrying on about floating-point arithmetic
> advantages of a machine that has 64 bit internal data paths.
> For Tomcat is is all about address space for caching user requests and
> responses and back-end transactions. It is getting the right hardware
> and software architecture to use the entire RAM optimally for serving
> web pages.
>
> Ron
>
>
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