From chemistry-request@ccl.net Wed May 19 20:42:02 2004
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Date: Wed, 19 May 2004 18:44:34 -0700
Subject: Re: CCL:Question regarding Mac G5 performance
From: Mengjuei Hsieh <mengjueh~at~uci.edu>
To: <jle~at~world.std.com>, <chemistry~at~ccl.net>
CC: Ray Luo <rluo~at~uci.edu>
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Hi Joe,

(a) Yes, it's possible. MPICH share memory works though it sucks. People in
the apple scitech community normally suggest LAM/MPI instead.
(b) You've better have IBM XL C/C++ and FORTRAN compiler
(c) Yes and No. XL compiler optimizes better than AltiVec Framework when it
goes to double. But AltiVec's framework helps GNU compiler a lot.

I would suggest you to check the customized quote from Apple
representatives.

For the benchmark, see
http://apple.sysbio.info/~mjhsieh/archives/000334.html

Best,
-- 
Mengjuei Hsieh, Luo group, Molecular Biology and Biochemistry, University of
California Irvine. Tel: 49562, Address: 3144 Natural Science I building,
UCI, Irvine CA 92697-3900. Group Homepage: http://rayl0.bio.uci.edu/

On 19 May 2004 12:06:49, Joe M Leonard at jle~at~world.std.com wrote:
> Folks, has anybody run QM or MD benchmarks on a dual-processor
> 2GHz G5 that they care to share?  I'm particularly interested
> in how they stack up to the newest/newer Opteron and Pentium4
> machines.  If you've worked with the newer Mac's, (a) is it
> possible to get good, useful 2x processor performance for
> double-precision code?  (b) what compilers are required to get
> (a)?  (c) is Altivec useful for double-precision code, or
> merely for int/float work?
> 
> A quick glance at apple.com suggests these machines go for about
> $3200 USD, which isn't that different from numbers gained from a
> quick glance at dell.com.  I know IBM chips were number-crunchers
> in the good old days, and I assume that's still the case now (which
> is why I'm looking to CCL for guidance :-).
> Thanks in advance!
> Joe Leonard
> jle~at~theworld.com



From chemistry-request@ccl.net Wed May 19 17:18:57 2004
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From: Rachel Crespo Otero <rachel_at_fq.uh.cu>
To: chemistry_at_ccl.net
Cc: jlabanow_at_nd.edu
Subject: Aminoacid-nucleotide interaction
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Does anybody know about aminoacid -nucleotide interaction calculations by
quantum mechanic methods? Can help with some references?
Thank you
Rachel




From chemistry-request@ccl.net Wed May 19 15:16:51 2004
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Date: Wed, 19 May 2004 16:13:22 -0400
From: Rick Venable <rvenable:at:pollux.cber.nih.gov>
To: Mike McCallum <mmccallum:at:pacific.edu>
cc: Joe M Leonard <jle:at:world.std.com>, chemistry:at:ccl.net
Subject: Re: CCL:Question regarding Mac G5 performance
In-Reply-To: <D78131E7-A9BC-11D8-AD5D-000A95DC4500:at:pacific.edu>
Message-ID: <Pine.SGI.4.51.0405191603510.132051:at:pollux.cber.nih.gov>
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On Wed, 19 May 2004, Mike McCallum wrote:
> The built-in Gigabit enet is attractive, also, as charmm and NAMD
> scale very well with gigabit, and it makes myrinet less
> price-effective (when used on any platform, wintel included, see
> http://biobos.nih.gov/apps/charmm/charmmdoc/Bench/c30b1.html for
> example).  I decided that dual G5 xserve cluster nodes with gigabit
> switches were much more cost-effective for me than any other
> processor, especially any high-bandwidth specialty comm method
> (apple's gigabit has a pretty low latency also).

Having run the CHARMM benchmarks cited above, I'd disagree that they
suggest Gigabit is a viable alternative to Myrinet for CHARMM
calculations; in fact, they suggest that Gigabit isn't much better than
100baseT, but doesn't degrade as badly for 8 processors on 4 nodes.
The performance gain is so marginal that site policy is to recommended
using only Myrinet for calculations with more than 2 processors.

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Rick Venable           29/500
FDA/CBER/OVRR Biophysics Lab
1401 Rockville Pike    HFM-419
Rockville, MD  20852-1448  U.S.A.
(301) 496-1905   Rick_Venable:at:nih.gov
ALT email:  rvenable:at:speakeasy.org
-------------------------------------
"Don't blame me, I voted for Kang."
                         Homer
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=


From chemistry-request@ccl.net Wed May 19 16:01:35 2004
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From: "John McKelvey" <jmmckel$at$attglobal.net>
To: "Ohyun Kwon" <ok16$at$mail.gatech.edu>, <chemistry$at$ccl.net>
References: <Pine.SOL.4.33.0405191228420.23586-100000$at$acmex.gatech.edu>
Subject: Re: CCL:transition dipole moment by TDDFT
Date: Wed, 19 May 2004 16:03:45 -0500
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Wild idea proposed...

What about the possibility of taking the natural orbitals of each state, Get
<Ci|r|Cj'> multiplied by the square root of the respective occupation
numbers, and then divide by SQRT(2+2<Ci|Cj'>)?... or something similar?

My $.02 ...  worth less and less with time....

John McKelvey


----- Original Message ----- 
From: "Ohyun Kwon" <ok16$at$mail.gatech.edu>
To: <chemistry$at$ccl.net>
Sent: Wednesday, May 19, 2004 11:32 AM
Subject: CCL:transition dipole moment by TDDFT


> Dear CClers'
> I would like to ask a question about how to calculate transition dipole
> moments between electronic states (between ground state and excite states
> or between excited state and exicted state).
> Some papers address that transtion dipole moments or exicted state dipole
> moments can be calculated by TDDFT using Gaussian98 or G04 programs.
> I would greatly appreciate it if anyone would kindly answer, comment, or
> address about this issue clearly.
> I will summarize all answere I will have.
> Thank you very much for your time.
>
> Best wishes,
>
>
> Tommy Ohyun Kwon, Ph.D
> School of Chemistry and Biochemistry
> Georgia Institute of Technology
> Atlanta Georgia, 30332
> Email: ohyun.kwon$at$chemistry.gatech.edu
>
>
>
> -= This is automatically added to each message by the mailing script =-
> To send e-mail to subscribers of CCL put the string CCL: on your Subject:
line
> and send your message to:  CHEMISTRY$at$ccl.net
>
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> -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>
>
>
>
>




From chemistry-request@ccl.net Thu May 20 03:51:53 2004
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From: Eugen Leitl <eugen-.at.-leitl.org>
To: chemistry-.at.-ccl.net
Subject: Re: [Beowulf] CCL:Question regarding Mac G5 performance (fwd from mmccallum-.at.-pacific.edu) (fwd from bill-.at.-cse.ucdavis.edu)
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----- Forwarded message from Bill Broadley <bill-.at.-cse.ucdavis.edu> -----

From: Bill Broadley <bill-.at.-cse.ucdavis.edu>
Date: Wed, 19 May 2004 15:13:32 -0700
To: Eugen Leitl <eugen-.at.-leitl.org>
Cc: Beowulf-.at.-beowulf.org
Subject: Re: [Beowulf] CCL:Question regarding Mac G5 performance (fwd from =
mmccallum-.at.-pacific.edu)
User-Agent: Mutt/1.4.1i

> I had done some comparisons between price/performance, and I found dual =
=20
> G5s to be at or near the best in price/performance, especially if =20
> things are recompiled with the IBM compilers (between 8-10 % speed =20
> increase over pre-compiled (with apple gcc) versions of NAMD2, and =20
> using standard gcc for charmm).  I would expect that things like =20
> gaussian03 run very well (I believe gaussian uses the IBM compilers for =
=20
> macOS).  For MD, the speedup seems to be due to the on-chip square root =
=20
> eval.

Any actual numbers would be very useful, ideally with the compilers,
compiler options, motherboard, and similar.  Did you compare 1 job per
node vs 1 job per node?  Or 2 jobs per node vs 2 jobs per node?  4 or 8
dimms?  Which kind of memory PC2700? PC3200?

> The built-in Gigabit enet is attractive, also, as charmm and NAMD scale =
=20
> very well with gigabit, and it makes myrinet less price-effective (when =
=20
> used on any platform, wintel included, see
> http://biobos.nih.gov/apps/charmm/charmmdoc/Bench/c30b1.html for =20
> example).  I decided that dual G5 xserve cluster nodes with gigabit =20

I come to a different conclusion based on those graphs.  In the first
graph myrinet improves by a factor of 2.6 (250 -> 95 seconds) from 2
processors to 8, where gige improves by only 20% (255 -> 210).  In the
second graph gigE gets SLOWER from 2 to 8 processors.  Do you think in
either case the 8 node (let alone 16) gige cluster would have better
price/performance then a myrinet cluster?

Seems like for applications like shown on that page you shouldn't
really bother with a cluster over 2 nodes with gigE, not many people
would be willing to pay a factor of 4 more for 20% or even negative
scaling.

> switches were much more cost-effective for me than any other processor, =
=20

Cost effective =3D price/performance?  Can you make any numbers available?

> especially any high-bandwidth specialty comm method (apple's gigabit =20
> has a pretty low latency also).

Oh?  Can you share the apple gigabit numbers?  What is "pretty low"?

> Additional considerations for us were the BSD environment which is more =
=20
> secure than windows, and the OS is arguably more stable and supported =20

I'd agree with more stable and supported for use as a desktop, I'd
disagree with stable and supported as computational node.  OSX is the
new player on the block in this space.  Do you really think you would
get a good response from calling apple's tech support line when the
scheduler or network stack isn't performing to your performance
expectations? =20

Certainly a very reasonable thing.

> It is my impression that opterons, PIVs, G5s all have their advantages, =
=20

Agreed, thus the value in sharing performance actual results for
specific codes in specific environments.

--=20
Bill Broadley
Computational Science and Engineering
UC Davis

----- End forwarded message -----
--=20
Eugen* Leitl <a href=3D"http://leitl.org">leitl</a>
______________________________________________________________
ICBM: 48.07078, 11.61144            http://www.leitl.org
8B29F6BE: 099D 78BA 2FD3 B014 B08A  7779 75B0 2443 8B29 F6BE
http://moleculardevices.org         http://nanomachines.net

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From chemistry-request@ccl.net Thu May 20 05:14:10 2004
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To: chemistry{at}ccl.net
Subject: Re: [Beowulf] CCL:Question regarding Mac G5 performance (fwd from mmccallum{at}pacific.edu) (fwd from hunting{at}ix.netcom.com)
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See

http://leitl.org/Benchmark.daresbury.pdf
http://leitl.org/compchem.pdf

for files mentioned in below message.

----- Forwarded message from Michael Huntingdon <hunting{at}ix.netcom.com> ---=
--

From: Michael Huntingdon <hunting{at}ix.netcom.com>
Date: Wed, 19 May 2004 23:05:12 -0700
To: Bill Broadley <bill{at}cse.ucdavis.edu>,
	Eugen Leitl <eugen{at}leitl.org>
Cc: Beowulf{at}beowulf.org
Subject: Re: [Beowulf] CCL:Question regarding Mac G5 performance (fwd
  from mmccallum{at}pacific.edu)
X-Mailer: QUALCOMM Windows Eudora Version 6.0.3.0

I've spent some time sifting through the attached numbers. Though not each=
=20
lends itself to hp Itanium 2, there appears to be a very balanced trend.=20
For clusters, scale down the hp rx2600 to the rx1600 dual CPU with fewer=20
PCI-X slots, comparable performance, HP-UX/linux/OVMS, in box upgrades,=20
excellent services, and education price under $3,000.

I'm at a loss as to why there is not a great deal more conversation around=
=20
these systems. hptc clusters should lend themselves to easy additions and=
=20
upgrades. An investment in Pentuim, SPARC,  Athlon, or Opteron yesterday,=
=20
should easily include G5, Itanuim 2 or futures toward cluster enhancements.=
=20
=46rom the attachments, it looks to me as though the Itanium 2 numbers are=
=20
(at least) compelling, with a long term commitment to the hardware=20
technology as well as the operating systems.

Cheers
Michael


At 03:13 PM 5/19/2004, Bill Broadley wrote:
>> I had done some comparisons between price/performance, and I found dual
>> G5s to be at or near the best in price/performance, especially if
>> things are recompiled with the IBM compilers (between 8-10 % speed
>> increase over pre-compiled (with apple gcc) versions of NAMD2, and
>> using standard gcc for charmm).  I would expect that things like
>> gaussian03 run very well (I believe gaussian uses the IBM compilers for
>> macOS).  For MD, the speedup seems to be due to the on-chip square root
>> eval.
>
>Any actual numbers would be very useful, ideally with the compilers,
>compiler options, motherboard, and similar.  Did you compare 1 job per
>node vs 1 job per node?  Or 2 jobs per node vs 2 jobs per node?  4 or 8
>dimms?  Which kind of memory PC2700? PC3200?
>
>> The built-in Gigabit enet is attractive, also, as charmm and NAMD scale
>> very well with gigabit, and it makes myrinet less price-effective (when
>> used on any platform, wintel included, see
>> http://biobos.nih.gov/apps/charmm/charmmdoc/Bench/c30b1.html for
>> example).  I decided that dual G5 xserve cluster nodes with gigabit
>
>I come to a different conclusion based on those graphs.  In the first
>graph myrinet improves by a factor of 2.6 (250 -> 95 seconds) from 2
>processors to 8, where gige improves by only 20% (255 -> 210).  In the
>second graph gigE gets SLOWER from 2 to 8 processors.  Do you think in
>either case the 8 node (let alone 16) gige cluster would have better
>price/performance then a myrinet cluster?
>
>Seems like for applications like shown on that page you shouldn't
>really bother with a cluster over 2 nodes with gigE, not many people
>would be willing to pay a factor of 4 more for 20% or even negative
>scaling.
>
>> switches were much more cost-effective for me than any other processor,
>
>Cost effective =3D price/performance?  Can you make any numbers available?
>
>> especially any high-bandwidth specialty comm method (apple's gigabit
>> has a pretty low latency also).
>
>Oh?  Can you share the apple gigabit numbers?  What is "pretty low"?
>
>> Additional considerations for us were the BSD environment which is more
>> secure than windows, and the OS is arguably more stable and supported
>
>I'd agree with more stable and supported for use as a desktop, I'd
>disagree with stable and supported as computational node.  OSX is the
>new player on the block in this space.  Do you really think you would
>get a good response from calling apple's tech support line when the
>scheduler or network stack isn't performing to your performance
>expectations?
>
>Certainly a very reasonable thing.
>
>> It is my impression that opterons, PIVs, G5s all have their advantages,
>
>Agreed, thus the value in sharing performance actual results for
>specific codes in specific environments.
>
>--
>Bill Broadley
>Computational Science and Engineering
>UC Davis
>_______________________________________________
>Beowulf mailing list, Beowulf{at}beowulf.org
>To change your subscription (digest mode or unsubscribe) visit=20
>http://www.beowulf.org/mailman/listinfo/beowulf



*********************************************************************
Systems Performance Consultants
Michael Huntingdon
Higher Education Technology               Office (408) 294-6811
131-A Stony Circle, Suite 500            Cell   (707) 478-0226
Santa Rosa, CA 95401                   fax    (707) 577-7419
Web:=20
<<http://www.spcnet.com>http://www.spcnet.com>=20
hunting{at}ix.netcom.com
*********************************************************************


----- End forwarded message -----
--=20
Eugen* Leitl <a href=3D"http://leitl.org">leitl</a>
______________________________________________________________
ICBM: 48.07078, 11.61144            http://www.leitl.org
8B29F6BE: 099D 78BA 2FD3 B014 B08A  7779 75B0 2443 8B29 F6BE
http://moleculardevices.org         http://nanomachines.net

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From chemistry-request@ccl.net Thu May 20 03:22:32 2004
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Message-ID: <002a01c43e43$a17c10d0$085686d9$at$cs.ucl.ac.uk>
From: Marialuisa Pellegrini-Calace <m.pellegrini-calace$at$cs.ucl.ac.uk>
To: Baoqiang Cao <bqcao$at$physics.uc.edu>, chemistry <chemistry$at$ccl.net>
References: <1084981318.2869.1.camel$at$dhcp-539-820.geop.uc.edu>
Subject: Re: CCL:The hydrophocities for 20 amino acids
Date: Thu, 20 May 2004 09:21:35 +0100
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  Cao,

  I'm aware of 2 experimental scales that can be used a measure of the
hydrophobicity for the 20 amino acids:

  1) the experimental water-phosphatidylcholine micelles and water-n-octanol
partition coefficients; the reference is:

  White SH, Wimley WC. Hydrophobic interactions of peptides with membrane
interfaces. Biochim Biophys Acta 1998;1376:339-352.

  2) the turn propensity scale, that is calculated by an experimental system
for the analysis of turn formation in a single 40 amino acid long poly(L)
TMH embedded in the membrane of the endoplasmic reticulum. The reference is
:

  Monne M, Hermasson M, von Heijne G, A turn propensity scale for
transmembrane helices. J Mol Biol 1999;288:141-145.

  Cheers,

  Marialuisa

  ___________________________________

  Marialuisa Pellegrini-Calace, PhD
  European Bioinformatics Institute
  Wellcome Trust Genome Campus
  Hinxton
  CB10 1SD Cambridge (UK)

  E-mail: marial$at$ebi.ac.uk
  Tel: +44 (0)1223 492543
  Fax: +44 (0)1223 494468
  ___________________________________

  ----- Original Message ----- 
  From: "Baoqiang Cao" <bqcao$at$physics.uc.edu>
  To: <chemistry$at$ccl.net>
  Sent: Wednesday, May 19, 2004 4:46 PM
  Subject: CCL:The hydrophocities for 20 amino acids


  > Dear CCL members,
  >
  > I need the experimental results of the hydrophobicities for 20 amino
  > acids, could you please show me how I can get them? Any tips will be
  > welcome!
  >
  > Best,
  >  Cao
  >
  >
  >
  >
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From chemistry-request@ccl.net Thu May 20 09:40:55 2004
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Date: Thu, 20 May 2004 10:42:23 -0400
To: Baoqiang Cao <bqcao^at^physics.uc.edu>, chemistry^at^ccl.net
From: "Yu Sun (Denis)" <sun^at^CLEMSON.EDU>
Subject: Re: CCL:The hydrophocities for 20 amino acids
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	servernd.ccl.net

In the paper: J. Chromatography A. 978(2002) 71-79,  more than 40 
different  hydrophobicity scales were classified. Some based on Gibbs free 
energy of transfer and retention time in HPLC. You may find the literature 
cited  in that paper useful.

Denis

At 11:46 AM 5/19/2004 -0400, Baoqiang Cao wrote:
>Dear CCL members,
>
>I need the experimental results of the hydrophobicities for 20 amino
>acids, could you please show me how I can get them? Any tips will be
>welcome!
>
>Best,
>  Cao
>
>
>
>
>-= This is automatically added to each message by the mailing script =-
>To send e-mail to subscribers of CCL put the string CCL: on your Subject: line
>and send your message to:  CHEMISTRY^at^ccl.net
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