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Posts by
1) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22664)
Posted 11 Jan 2011 by
Post:
Hi; I dont use special algoritms (yet).
I am very lucky in that the parallelism is over particles
and every particle is independent.

Once I achieve results reproducibility I will be
looking at some floating underflows and summation algorthims
but right now I just want identical results.

Regards. Eric.
2) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22663)
Posted 11 Jan 2011 by
Post:
....and dont I know it!
Everything should be updated
in the next weeks if all goes according
to plan.

I dont have permissions to actually
send the news but that should also be
taken care of. Eric.
3) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22652)
Posted 2 Jan 2011 by
Post:
Dear LHC@home supporter, I hope you
had a good Christmas and I wish you all
the best for 2011. The last few years have
been difficult, but I now believe there is a
plan in place to repatriate the BOINC
servers to CERN itself and to provide scope for
additional applications as well as an updated
and improved SixTrack service. News should
appear on the LHC@home project NEWS.

2010 was a good year for the LHC and it ended with
a very successfull run using lead ions instead
of protons.

In the meantime I have been busy developing
SixTrack in order to produce executables with
0 ULP difference in the results using different
Fortran compilers, at any optimisation, and on
any IEEE 754 compliant platform. This would be
a small technical breakthrough, but extremely
useful for the portability of SixTrack. It should
(at long last) allow the use of an executable for
MACs and allow me to start development for
GPUs, once a satisfactory service has been
established.

Thankyou again for your continued support and patience.
4) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22541)
Posted 9 Sep 2010 by
Post:
So accelerator design is
not REAL physics.!
I\'ll remind you that
without the stable accelerator
beam there wouldnt be
any physics at all. Nice
to hear you are moving on even if
the current service level is
abysmal.
5) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22491)
Posted 19 Aug 2010 by
Post:
A Real Programmer can write a FORTRAN program in any Language.
(From the WEB)

Well, interestingly enough, the madX general purpose
accelerator design program kernel PTC is written in Fortran 95
embedded in C++. The planned successor to mad8, mad9,
in C++ was never completed successfully. IMHO this
was due to the design choices rather than the choice
of language. There is no need to be a bigot or a fanatic
about this. All my nunerical methods are equally aplicable
to C/C++ as well as Fortran. I don\\\'t consider Java; it may have
improved ith last ten years but I don\\\'t have time to look
(see Goldberg, Kahan, or Wikipedia). C/C++ has the advantage
of being well known to the next generation; Fortran is in a
high performance niche, and one day I might try and measure
any performance difference on some real application.
Horses for courses.
6) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22473)
Posted 17 Aug 2010 by
Post:
We are working on it. More news
in September. I can even dream
that we will achieve 0 ULP
difference on ANY IEEE processor
which will open up MACs and GPU\'s
etc. In the emantime just trying
to get the server and API upgraded
and a Linux executable.
7) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22472)
Posted 17 Aug 2010 by
Post:
Please don\\\'t patronise Fortran.
While SixTrack is Fortran 77
Fortran 90 onwards is a real
structured programming
language with everything you need.

We are not dead; I expect we shall
become really alive in September.

Eric.
8) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22421)
Posted 13 Jul 2010 by
Post:
Have you tried for CERN as
a student/associate/fellow or
whatever?
9) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22417)
Posted 10 Jul 2010 by
Post:
Been a long time, too long.
It is all beginning to happen I think and a plan is finally being put in place.

Can\\\'t say much yet. But planning to
upgrade both server and api
and \\\"everything\\\" else.
10) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22315)
Posted 16 May 2010 by
Post:
Well, it has been a while and I missed the
Easter deadline! I should be working on the
Linux executable, but I thought it vital tp
finally give you an update.

We now seem to have a working Windows executable
with NO graphics. the graphics were unrealistic and wasted CPU.
The graphics don\\\'t work I think because we have an old
API and a more moder server side. (This because the
servers were moved and upgraded without information or
consultation.) Just identified a problem with long task names,
work unit names, which was also causing failures. We shall
avoid long names for the moment.

Current plan is to get a Linux executable with a more recent
API and if and when that works, to upgrade the Windows executable,
and maybe add some very very simple graphics.

Even better news is that CERN will now tolerate our work,
and even host the servers, and we are hoping to have server
side support closer to home. More on this if it comes to pass.

In the meantime thanks for your patience and continued support.

I would really like to get compiler independence and then a MAC
and CUDA executable..............dream on as the first priority
must be to get an up to date stable service.
11) Message boards : Number crunching : Waiting on Linux App
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(Message 22310)
Posted 15 May 2010 by
Post:
Please BigMac.

We poor little penguins feel discriminated.

I am a Linux fan myself; we were among the first
to use Unix on our second hand Cray.

I have been working even on holiday and
we have an almost working Windows executable.
The basic problem is that we have a very
very old boinc api
and I am trying to build with a new one; but which
Kernel version etc etc. Problems to test
as well. More on my \\\\\\\"Whatever happened
to LHC@home\\\\\\\" soonest.
12) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22074)
Posted 15 Mar 2010 by
Post:
Dear All;
The following questions are open:

why don\\\'t you do a survey?
on the forum or via mail.
this could make clear which are the most importent problems.

Never thought of that; I am hoping to get the feedback from
the server side. That would quantify the problems we are
having. We are already getting feedback on the Message Boards. I\'ll bear it in mind. Eric.
13) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 22072)
Posted 15 Mar 2010 by
Post:
Dear All; supposed to be on vacation and in the pool and
doing arithmetic with my grand-daughters!
Time is of the essence and I am actually trying to build a
Linux executable before moving on to a more recent API and with some simple graphics displaying progress. The present
build for Windoes involves application code generation on
Linux, moving it and makefile to Windows via CYGWIN. building
the crlibm on cygwin, importing the objects to a Windows .NET (2003Version ONLY..) and then a build. All this
on an ancient PC with hardly any memory.

For an update on progress I am appending latest status and
questions.

Status and Questions Monday, 15th March, 2010.

The following questions are open:

a) Are we submitting the work to all Windows clients?
b) Are results being rejected? and if so why?
c) In particular why does Emanuele never get any results
even though his sixdeskfpopse has been doubled?
This is study slhc_ultimate_with_bb_and_corrections_40cm_target10
in his ~elaface/workspace1/sixjobs.
His jobs take (mostly) around 1 day on a modern PC and the variable
sixdeskfpopse=60000000000000 i.e. 6*10**13.
d) How many work units are failing because of the volunteer reported
problem with the Windows graphics?
e) For Francois and Ben; where is/what happened to pcolrent16???

In the meantime Frank and Massimo are getting results but rather slowly.

There are Windows executables for SixTrack (NO graphics) and for
SixTrackBNL (NO graphics) in ~boinc/SixTrack. I cannot build any new
Windows apps while on vacation (security makes it almost impossible
to login to my very very slow machine at CERN).

I do have access to lxplus and my desktop Linux at CERN. I have Windows 7
HOME Premium here but this has no Virtual Machine capability. I could download
cygwin and then the boinc trunc and try building for Limux with that. The
machine is an Athlon but with 32-bit Windows 7. I don\\\\\\\'t fancy that much.

I have downloaded the complete BOINC trunc of the \\\\\\\"stable\\\\\\\" code to my Linux
PC pcapi98 ate CERN. This is runninmg SLC4 based on RedHat Linux. The
system is 32-bit and has kernel version 2.6.9-89.0.16.EL.cern. I feel this
might be good enough to be compatible with most of our Linux clients.
This system has gcc version 3.4.6 20060404 (Red Hat 3.4.6-11).
Looking at usr/lib/gcc/i386-redhat-linux/ it seems I might be able
to use 3.2.3 instead. Any advice/help welcome.

Another QUESTION: what Linux versions are being used by our lhcathome
clients???

So; I shall try and build the lib, boinc_api and boinc_api_fortran on this
platform and then make a new Linux executable. My lf95 Fortran compiler
is installed for this Linux version anyway, so I believe this might just
produce a working Linux executable.

Last question; how do I test??? Will crashes due to system call problems be reported?
The clients/users are normally extremely helpful and I would assume they would
let us know in no uncertain fashion.

So, in summary, let us get the production sorted out and get some results for
Emanuele (Laface) and I shall continue work on trying to build a Linux
executable for i386 and a not too recent kernel.
14) Message boards : Number crunching : Computation error
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(Message 22071)
Posted 15 Mar 2010 by
Post:
I\'m sorry about graphics problem; I have given priority to
getting a Linux executable and getting these very very long
beam to beam jobs working. I should also look at how
you could restart. I guess BOINC kills the work unit agter
this problem, but actually I have checkpoint/restart files
which mean it could just be restarted...........
15) Message boards : Number crunching : Maximum elapsed time exceeded
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(Message 22070)
Posted 15 Mar 2010 by
Post:
Dear All; as Neasan has pointed out the time limit was too
small and as he said it was reduced deliberately at client
request. I am reallky sorry about this but we are trying
something that has never been done before because of the
very big CPU time requirement. The time spent in beab-beam
interaction computation is clearly very significant and perhaps
I shall have to change the sixdeskfpopse=`expr $sixdeskturns \\* $sixdeskparts` times a million algorithm
to take account of the type of study. Eric.
16) Message boards : Number crunching : Maximum elapsed time exceeded
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(Message 22069)
Posted 15 Mar 2010 by
Post:
I hope so; I doubled the time limit. Eric.
(Note also that if interrupted I have a checkpoint/restart
so that we do not lose everything, but restart from evry thousand turns i.e evry two minutes roughly.
17) Message boards : Number crunching : Maximum elapsed time exceeded
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(Message 22068)
Posted 15 Mar 2010 by
Post:
Hi Thomas; this is actually very good news. These are
one million turn studies of beam beam interaction and
are VERY CPU intensive. Eric.
I just hope the results get back to me!
18) Message boards : Number crunching : Is LHC@home still ongoing and operational?
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(Message 22067)
Posted 15 Mar 2010 by
Post:
Alive? yes but.....Please see Message Board Cafe LHC and
my thread Whatever happenened to LHC@home. Eric.
19) Message boards : Number crunching : Is LHC@home still ongoing and operational?
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(Message 22066)
Posted 15 Mar 2010 by
Post:
Alive? yes, but struggling. Please see Message Board
Cafe LHC and my thread Whatever happened to LHC@homë.
Eric.
20) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks.
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(Message 21969)
Posted 5 Mar 2010 by
Post:
Thanks; I\'m working on it. Eric


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