Mark Thornton schrieb:

Yes, I'm running the AMD64 JVM under debian on a Xeon server.

Roedy is right, AMD really did steal Intel's thunder in the 64-bit
world, but Intel introduced an instruction set that is compatible to AMD64.

From the wikipedia:

Timo

On Thu, 04 May 2006 20:14:15 GMT, Mark Thornton
<mark.p.thornton@ntl-spam-world.com> wrote, quoted or indirectly
quoted someone who said :

Shall we try the experiment?  That would be great if it did. The last
time I looked was a few months back. They referred to  it as AMD, no
mention of  Xeon. That's a funny thing to do.

Is this true?

Itanium: 64 bit, wildly different from anything else. No 32 bit
support?

AMD Athlon: basically a 32-bit Pentium with add on 64-bit support of
AMDs devising, Pentium like.

AMD Opteron : basically a 64 bit Athlon with tacked on 32 bit support.

Xeon: pentium with AMD 64 bit?  Intel 64bit extension?

to run in 64 bit mode, do you need a 64 bit OS, or do 32-bit OSes
allow some 64-bit tasks?

Yes it will work.  But be warned that the 64-bit implementation on Xoen
processors do not work all that efficiently.  In many bencharmks the
32-bit code runs faster than the 64-bit.  Intel was rushed into
delivering its 64-bit product so they didn't have time to optimize it.
The 64-bit versions comming out now though are much, much faster!

Use the standard AMD 64-bit JVM!

I've installed a Debian linux on my AMD Opteron.  I installed
absolutely everthing in native 64-bit (kernel, drivers, JVM, database,
etc), it was easy and it works like a charm.

If you set it up like I have, when you compile your C code, it will
compile it all in 64-bit transparently.

As a side note:

Our company wanted to go 64-bit, but I refused the Xeon processor and
recommended the Opteron instead.

There are several reasons for this:

1) AMD is true to its road-map, while Intel is all over the place (due
to FUD).  I'll be able to upgrade my Opteron process with a quad core
in about 12 months time and literaly triple my server performance.
Intel on the other hand, the roadmap did not allow me to do this.

2) AMD is tue native 64-bit and runs flawlessly!  Intel's 64-bit is at
times slower than 32-bit mode.  Processor runs alot hotter (I'm using a
U1) and didn't want to take the chance.

---

And for those Intel fans, AMD did not steal 64-bit from Intel...
engineers said it was impossible to do, so Intel didn't want it and
they didn't do it.  They gave it away, so AMD just gladly took it.

And if you know your history, AMD did not steal x86 instruction set,
they were given a license by Intel when IBM told them to.  So they have
all the legal rights to it.  It doesn't mean that AMD inovated a much
more powerful way to process such x86 instructions than Intel that they
are to be blamed.

Either way, you WILL get on the bandwagon... sooner or later!