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To: Elmer who wrote (136030)5/25/2001 1:26:28 AM
From: Rob Young  Read Replies (1) | Respond to of 186894
 
Elmer,

First, the measurement is called tpmC. The TPC-C benchmark
is "supposed" to mimic OLTP (i.e. typical transaction based
environments). This metric has been greatly abused over
the years as it allows officially sanctioned "cheating"
to take place. This "cluster cheat" allows you to have
multiple copies of the DB. What benchmarketers do is
have multiple clustered nodes in a shared nothing fashion
have a copy of the db hang off each node (simplification)
providing great scaling.

Real world, you wouldn't have multiple copies of your
database around as most folks wouldn't be spending that
kind of bucks on disks and management overhead. There are
some tpc.org TPC-C benchmarks out there with 9000 disk
drives in the config. For a much better and more thorough
explanation of the "cluster cheat" pick up Greg Pfister's
book, "In Search of Clusters":

amazon.com

Regarding "64 GBytes" being sufficient... shoot, 64 GBytes
is way over kill for most situations. In OLTP , you typically boot up with a large SGA (Oracle) carved out
of main memory and let the Oracle or SQL manage the blocks.
With a largish DB (1, 2, or more Terabytes) only so much
of that will be hot (indexes). Indexes beyond 30-40 Gig
total size are rare except for large databases (large being relative, but the point here is this is a small
segment of the marketplace compared to the total
marketplace). If you hit cache when searching, you will
have to hit disk to retrieve records, etc when
DBs grow large. I'm not a DB
but I have read enough and worked with them enough to be
a bit dangerous. But reading the most recent articles
you see the pundits proclaim that Itanium will be for
high-end DB situations where you can "load the whole DB
in memory and not hit the disk." Shoot, you can do that
today. In fact, if your database is larger than 128 GBytes
there is only one server on the market with enough memory
to load up a DB that large in memory. The AlphaServer
GS320 supports 256 GBytes of main memory. These writers/pundits/Inteldrones think as if Intel is about to
release 64-bit computing on the world. Sheeeshhhh...
But the market segments for large dbs and large memorys
are small and growing. The bulk of the market (99%? ? )
is more than quite content with a server that supports
64 GBytes of memory.

"Unfortunalely that link doesn't work."

Go to page 7 here:

realworldtech.com

"Somethings beyond your expectations for Intel fans to crow about "

We have known for over 3 years that Merced was going to
disappoint at Integer (or many had supposed they knew
and had been crowing about underwhelming Integer
for quite some time):

From: Henrik Klagges (henrik@strategypartners.com)
Subject: Bottle of Champagne IA64 bet taken :-)
Newsgroups: comp.arch
Date: 1998/10/22


Hello,

xyzzy wrote:
>
> On Thu, 22 Oct 1998 00:02:58 +0200, Henrik Klagges
> <henrik@strategypartners.com> wrote:
>
> >I'm betting a regular bottle (fullsize) on IA32 code, and
> >a small bottle on IA64 code :)
>
> I will take the second bet. Merced (running IA64 code) should trounce
> the P6 in integer (and other) performance. It's not a contest unless
> the P7 comes out before Merced.

Bet taken! One small bottle of decent champagne that the fastest
available Intel IA32-processor beats the first IA-64 Merced on SPECint
when the first Merced ships. Bet includes normal freight to were you
(or I) are.

Cheers,
Henrik

--
Henrik Klagges - IT Analyst
henrik@strategypartners.com
PGPKey available on request

-----

While compelling or very good Fp is a "good thing", the
money is in commercial/business. Much better would have
been the opposite. Decent fp and world beater integer and
tpmC numbers. It would certainly speed adoption. It won't
help if Foster is better commercially (speeding adoption that is). The obvious clue there is Intel's number one
partner (Microsoft) spends most of its time doing business
applications and is interested in great business performance. Microsoft's tepid (non-existent mostly) reactions about Itanium in the Wintel tradepress is not
a good sign if you ask me.

Will be fun to see how this all plays out after baking
for 7 years.

Rob



To: Elmer who wrote (136030)5/25/2001 2:10:40 AM
From: Rob Young  Read Replies (1) | Respond to of 186894
 
Elmer,

Just for grins:

linleygroup.com

"We have increased our projections of the chip’s SPEC_base
performance to 50 int and 80 fp. We expect it to achieve
45,000 tpmC on the TPC-C benchmark in a four-processor
system based on Intel’s 460GX chip set and Lion
motherboard. These scores should give Itanium performance
leadership when it is released, but its performance could
be surpassed by Compaq’s Alpha processors within a matter
of months"

To give you an idea what that translates to... our clever
friends at Compaq stuck a 833 MHz ES40 score out there
circa 3Q2000 using the since "retired" Spec95 numbers:

Peak Base
AlphaServer ES40 50.0 44.6 Integer
100.0 84.3 Fp

Spec2000:

544 518 Integer
658 590 Fp

Will be interesting to see how accurate Linley's predictions
were/are.

Rob