| Author |
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Guest
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 Posted:
Tue Jul 12, 2005 4:15 pm Post subject:
simd for 390(or z990)? |
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Are there any plans for simd support in the s390/z990 architecture?
Dont mainframe apps deserve vector instructions? |
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Del Cecchi
Guest
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| Posted:
Tue Jul 12, 2005 4:15 pm Post subject:
Re: simd for 390(or z990)? |
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franks_csa@yahoo.com wrote:
| Quote: | Museum, sure, should your company be the one to start with?
Are you an idiot troll or are you looking for actual information? |
Vector Facility was a SIMD extension to (one of the 3x0 architecture
boxes). Look it up, and get back to us.
--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.” |
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Guest
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| Posted:
Tue Jul 12, 2005 4:15 pm Post subject:
Re: simd for 390(or z990)? |
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| Museum, sure, should your company be the one to start with? |
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Greg Lindahl
Guest
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| Posted:
Tue Jul 12, 2005 4:15 pm Post subject:
Re: simd for 390(or z990)? |
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In article <1121179201.264869.127270@g14g2000cwa.googlegroups.com>,
<franks_csa@yahoo.com> wrote:
| Quote: | Are there any plans for simd support in the s390/z990 architecture?
Dont mainframe apps deserve vector instructions?
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If you want a Vector Facility, you could check in a museum...
-- greg |
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Michel Hack
Guest
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| Posted:
Fri Jul 15, 2005 10:06 pm Post subject:
Re: simd for 390(or z990)? |
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Del Cecchi wrote:
| Quote: | franks_csa@yahoo.com wrote:
Museum, sure, should your company be the one to start with?
Are you an idiot troll or are you looking for actual information?
Vector Facility was a SIMD extension to (one of the 3x0 architecture
boxes).
|
Well, that's the point: *was*. The VF died with the bipolar boxes
(3090
was the last one, in 1992). It is now officially dead, in that the
opcode
space has been re-used for new 64-bit instructions in z/Series
machines.
Now, does the Computer History Museaum in fact have one?
Michel. |
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Anne & Lynn Wheeler
Guest
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| Posted:
Fri Jul 15, 2005 11:56 pm Post subject:
Re: simd for 390(or z990)? |
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"Michel Hack" <hack@watson.ibm.com> writes:
| Quote: | Well, that's the point: *was*. The VF died with the bipolar boxes
(3090 was the last one, in 1992). It is now officially dead, in
that the opcode space has been re-used for new 64-bit instructions
in z/Series machines.
|
i heard somebody once trying to make the case that 3090 VF was purely
a marketing offering ... that 3090 scalar had been so optimized that
it could drive memory at nearly saturation ... and therefor there was
little additional thruput gained from using VF.
--
Anne & Lynn Wheeler | http://www.garlic.com/~lynn/ |
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Greg Lindahl
Guest
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| Posted:
Sat Jul 16, 2005 12:15 am Post subject:
Re: simd for 390(or z990)? |
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In article <m34qav28zx.fsf@lhwlinux.garlic.com>,
Anne & Lynn Wheeler <lynn@garlic.com> wrote:
| Quote: | i heard somebody once trying to make the case that 3090 VF was purely
a marketing offering ... that 3090 scalar had been so optimized that
it could drive memory at nearly saturation ... and therefor there was
little additional thruput gained from using VF.
|
That certainly wasn't the case for my code: I could hit near peak on
the VF.
-- greg |
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Guest
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| Posted:
Sat Jul 16, 2005 8:15 am Post subject:
Re: simd for 390(or z990)? |
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Michel Hack wrote:
| Quote: | Well, that's the point: *was*. The VF died with the bipolar boxes
(3090
was the last one, in 1992). It is now officially dead, in that the
opcode
space has been re-used for new 64-bit instructions in z/Series
machines.
Now, does the Computer History Museaum in fact have one?
|
Probably not.
Your post is factual, but in being so critical of the post to which you
are replying, I think you're giving the original poster too much
credit: I don't think "was" was _his_ point.
Still, it is a fair question to ask; since a z/990 is a very powerful
computer, and powerful computers often have vector facilities, why
don't IBM's top-of-the-line z/Architecture machines have a vector
facility?
The answer, of course, is that if IBM wants to make a vector facility,
it will add one to the PowerPC architecture. That's what it uses to
build machines like Blue Gene. The System/360 architecture is used to
run legacy code on the most powerful *database engines* in the world.
And you don't use a database engine for number crunching.
Originally, the System/360, of course, handled a "full circle" of
applications, having both floating-point arithmetic on one side of
integer, and packed decimal arithmetic on the other side of (binary,
two's complement) integer. Today, instead of being general purpose, it
is a niche architecture with a special purpose.
This is a pity - the System/360 architecture, and the 68020
architecture, deserve better, being simpler to understand than the
80386 architecture, and being more efficient in code size than PowerPC
and other RISC architectures.
This doesn't make it easy for people to learn programming in assembly.
(What human being would try programming an Itanium in machine
language?)
John Savard |
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Eugene Miya
Guest
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| Posted:
Wed Jul 20, 2005 6:38 am Post subject:
Re: simd for 390(or z990)? |
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franks_csa@yahoo.com wrote:
| Quote: | Museum, sure, should your company be the one to start with?
|
Del Cecchi wrote:
| Quote: | Are you an idiot troll or are you looking for actual information?
Vector Facility was a SIMD extension to (one of the 3x0 architecture boxes).
|
In article <1121447192.948708.295880@g49g2000cwa.googlegroups.com>,
Michel Hack <hack@watson.ibm.com> wrote:
| Quote: | Well, that's the point: *was*. The VF died with the bipolar boxes
(3090
was the last one, in 1992). It is now officially dead, in that the
opcode
space has been re-used for new 64-bit instructions in z/Series
machines.
Now, does the Computer History Museaum in fact have one?
|
No.
It's on the collect list.
It's low to moderate priority since, we will assume that IBM will
collect one for their collection.
But we'll take one if you have one.
We still need to get a 3090.
-- |
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