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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