Lhc@home, Обработка данных с Большого Адронного Коллайдера Налаштування

[Anthony]

Проект "Lhc@home"

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• Официальный сайт
• Официальная статистика по команде "Ukraine"
• Статистика на фришниках
• Статистика на фришниках по команде "Ukraine"
• Состояние серверов

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ТОП-50 участников:

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Дата основания команды - 02.09.2004 Капитан - Death

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Для присоединения к команде Украины:
1. Загрузите BOINC менеджер (Если его у Вас еще нет!)
2. Перейдите в "расширенный вид"
3. Выберите сервис ---> добавить проект
4. Введите адрес проекта http://lhcathome.cern.ch/lhcathome/
5. Введите свои регистрационные данные.
6. Найдите нашу команду. Она называется Ukraine и адрес ее статистики вы могли видеть выше.
7. Если есть доступные для загрузки задания Вы их получите и начнете расчеты.
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Полезная информация:
Для идентификации пользователя в BOINC могут служить 2 вещи:
1) пара e-mail/пароль
2) межпроектный идентификационный ID (Cross-project ID) - 32значное шестнадцатиричное число.

Если Вы пожелаете подключится ещё и к другому BOINC-проекту, то помните: чтобы не плодить новых аккаунтов при подключении к новому проекту или команде, нужно обязательно везде регистрироваться с одним и тем же e-mail/паролем либо CPID. если при регистрации в проекте указать другие e-mail или пароль, BOINC создаст новый аккаунт с тем же именем!
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О проекте:
Проект занимается моделированием процессов, которые будут происходить в строящемся сейчас в Швейцарии LHC (Large Hadron Collider) - самом большом в мире ускорителе частиц. Проект должен помочь ученым лаборатории CERN в завершении строительства ускорителя и в его настройке.

Что такое LHC@home?
Большой адроннный-коллайдер Large Hadron Collider (LHC) - самый большой в мире научный инструмент. Он в настоящее время строится в лаборатории ЦЕРН в предместьях Женевы, Швейцария. Когда он будет запущен в 2007 г., он сможет разгонять лучи протонов до огромных энергий в кольцеобразном туннеле длиной 27 км. Два пучка частиц будут двигаться по этому кольцу в противоположных направлениях навстречу друг другу и в четырех точках кольца траектории частиц пересекутся, и они столкнутся с частицами, движущимися в противоположном направлении им навстречу. В точках пересечения траекторий частиц ученые строят четыре огромных датчика для обнаружения результатов их столкновений.

Большинство научных вычислений, перед необходимостью которых окажутся работающие на LHC учёные будут требовать доступа к огромным объемам хранимой информации. LHC будет ежегодно производить до 15 петабайт (15 миллионов гигабайт) данных. Такие требования к данным означают, что большинство программ анализа не смогут выполняться на отдельных компьютерах. Вот почему ЦЕРН ведет разработку вычислительной сети, которая стремится объединить сотни главных вычислительных центров во всем мире.

Однако есть ситуации, в которых для LHC имеют смысл общественные распределённые вычисления. Отдел ИТ ЦЕРНа интересуется развитием подобных технологий (использованных, например, проектом SETI@home), с целью их будущего применения. Уже сейчас в распоряжении ЦЕРН имеется программа под названием SixTrack, которая моделируюет движущиеся по кольцу в LHC частицы для изучения стабильности их орбит, требует относительно небольшого объема ввода/вывода, и может выполняться на обычном PC.

Программа SixTrack производит результаты, которые являются существенными для проверки долгосрочной стабильности частиц высоких энергий в LHC. Лин Эванс (Lyn Evans), глава проекта LHC, говорит, что "результаты SixTrack действительно имеют значение, предоставляя нам новое понимание того, как LHC будет работать".

Обычно SixTrack моделирует одновременно 60 частиц, движущихся по кольцу в течение 1 000 000 циклов. Это может показаться огромной цифрой, но в реальном времени эти циклы проходят менее чем за 10 секунд. Однако, этого достаточно, чтобы проверить, собирается ли луч оставаться на устойчивой орбите в течение намного более длительного времени, или рискует потерять контроль и улететь с курса в стены вакуумной трубы. Это очень серьезная проблема, т.к если бы это случилось в действительности, это могло бы привести к длительной остановке коллайдера для проведения ремонта. Повторяя такие вычисления тысячи раз, можно планировать условия, при которых луч должен быть устойчив.

Каждый раз при установке нового магнита, измеряются его свойства. Если они значительно отклоняются от установленных значений, немедленно запускается SixTrack для того, чтобы узнать, какое влияние (если оно есть) эти отклонения могут оказать на работу машины. Для инженеров, устанавливающих магниты очень важно как можно скорее получить результаты SixTrack. Поэтому, ваше участие в LHC@home действительно помогает строить LHC!

Источник: distributed.ru

По состоянию на 16.01.15 число участников составило 125 002, которые подключили к проекту 331 238 компьютеров.
Текущая скорость (гигафлопс) составила 15,751 .

Ссылки
Дела коллайдерные
Большой адронный коллайдер готов к запуску
Столкновение на встречных курсах
Ускоритель LHC. Общая информация.
FAQ LHC@Home
Использование BOINC в CERN
LHC@home collaboration area
http://lcg.web.cern.ch/LCG/
https://twiki.cern.ch/twiki/pub/LHCAtHome/L...BOINCThesis.pdf

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Статус сервера выдачи заданий:



Це повідомлення відредагував gladiator_maximus: Jan 16 2015, 17:21

[Rilian]

Или наконец-то прислушались к замечаниям юзеров ...

[Gecko]

http://www.mk.ru/blogs/MK/2009/02/25/socie.../?from=novoteka
"Россия включилась в гонку коллайдеров "

возможно скоро будем считать

[Rilian]

Есть ВЮ. Налетайте пока не разобрали!

[nikelong]

Help LHC@home design the Large Hadron Collider (LHC), a particle accelerator being built by CERN in Geneva, Switzerland. LHC@home "simulates 60 particles at a time as they travel around the ring, and runs the simulation for 100,000 [to 1,000,000] loops around the ring ... to test whether the beam is going to remain on a stable orbit for a much longer time, or risks losing control and flying off course into the walls of the vacuum tube - a very serious problem that could result in the machine being stopped for repairs if it happens in real life. By repeating such calculations thousands of times it is possible to map out the conditions under which the beam should be stable." On June 30, 2005, the project released its first set of work units which simulate 1 million loops around the ring. On January 28, 2006, it began its next study. "The new study is an extension of previous simulations. We want to evaluate the long term beam stability in the LHC in the presence of unknown or partially corrected magnetic imperfections, i.e. small field errors in the magnet elements. This scenario must be expected especially in the first few years of the LHC and in particular during its startup in 2007. An essential part of this study is therefore the definition and test of a dedicated configuration for the LHC commissioning. The necessary resources for such a study are available only within the LHC@home project."

The project released its first status report on November 3, 2004. It successfully completed over 500,000 jobs by that date with the help of 6,000 registered users and 7,500 active computers. It released its fourth status report on September 8, 2005. The project is in production mode as of July 13, 2005. The project officially relaunched in the UK (where it is now based) on October 12, 2007. The project will run the SixTrack application until the LHC starts in 2008, and will continue running after the LHC launch to compare simulation data with real data. The project will also begin running the Garfield application (which simulates two- and three-dimensional drift chambers (i.e. gaseous detectors) sometime in the near future, and may eventually run another application "simulating particle collisions for the ATLAS experiment, one of the four major LHC experiments."

Join a discussion forum about the project.

[Rilian]

April 29, 2009
Francois Grey discusses Citizen Cyberscience (and BOINC) in The CERN Courier.

[Death]

надо держать в активніх.
там мі плотно стоим в стате. пара тісяч очей дадут пару мест.

73 73 University of Texas at Dallas 0 0 0 0 0 0 26 18 285,674
74 74 Purdue Physics 0 0 0 0 0 0 0 3 282,965
75 75 Astroseti 0 0 0 0 0 0 0 2 278,590
76 76 SETI@klamm.de 0 0 0 0 0 0 10 4 275,882
77 77 LHC@Estonia 0 0 0 0 0 0 19 6 268,641
78 78 Hewlett-Packard 0 0 0 0 0 0 0 2 257,560
79 79 Ukraine 0 0 0 0 0 0 9 14 256,442

[T0lsty]

заданий уже месяц не было ((

[T0lsty]

сегодня было немного заданий .

десяток словил .

[(_KoDAk_)]

Contributed by bkuschel

20.08.2009 10:45 GMT
Hi, It's been pretty quiet here at LHC@home we've been working behind the scenes to streamline the server and keep the code as up to date as possible.
There has also been some work on the update of the SixTrack application which we hope to roll out soon. The news with the LHC itself since the set back last year is quite good with it running at 3.5TeV this year. The experiments have also been busy with ATLAS and CMS and LHCb and ALICE working on refinements during the downtime.
Thanks,
Neasan

[Rilian]

из поста непонятно что будет/происходит с LHC@home ...

[YuRi]

Относительно самого проекта РВ новостей нет, если, конечно не считать новостью то, что они стараются чтобы серверное ПО было как можно более новым (во что, по моему опыту работы с БАКна ДомУ, мне струдом верится) и то, что они проводят очередные работы по обновлению клиентского ПО, которые должны вскоре завершиться.

[Rilian]

2009-08-20: LHC@Home
Hi, More news from the LHC the two smaller experiments have posted an update. How TOTEM and LHCf have spent the last 10 months improving their systems. Thanks, Neasan

[Rilian]

Dear long suffering LHC@home subscriber,
First let me thank you for your signing up and for
your contribution to the LHC tracking studies being
performed by the Accelerator and Beam Physics Group (ABP)
at CERN and elsewhere. It has been agreed that your contribution will be
acknowledged in any published paper.

As a result of some very valid criticism on the Message Boards
I have modified the Work Unit submission system to submit each task
only twice and not six times as before. This means even less work
to be done of course, but it should mean that your valuable resources
are not wasted and that you get credit for any task you complete.
I have also set a deadline of three days for a task to complete in
order to get a reasonable turn round. I await feedback from the
physicists and from yourselves. Although I am confident that the
results on any IEEE Pentium or compatible should be 64-bit double precision
floating-point IDENTICAL some PCs produce wrong results
probably due to over-clocking or memory errors or hardware failure.
My best estimate is that around 3% of work units fail, in line with
other BOINC projects. I still feel it is necessary to run each task
twice in order to guarantee valid results. (Indeed this has allowed
me to find a couple of failing desktops at CERN and even one in the
CERN Computer Centre cluster.)

Around five or so years ago I had the idea of using the CERN in house
desktop WINDOWS systems to run accelerator design applications using the
FORTRAN program SixTrack as developed by my colleague Frank Schmidt. This
program is the main tool for LHC tracking studies, it is standard
Fortran 77, and is part of the SPEC 2000 benchmark suite
(see www.Frank.Schmidt/sixtrack.html for documentation). The idea was not
original of course but was based on my knowing of SETI@home. I also
had a look at PlayStations, but then found out that they did not perform
IEEE 754 compatible double precision floating-point. After some work by
my colleague Andreas Wagner of the IT department at CERN we were able to
set up an in house system called CPSS allowing us to use a few thousand
Windows desktops at CERN. This work is described in CERN MODULAR PHYSICS
SCREENSAVER or USING SPARE CPU CYCLES OF CERNs DESKTOP PCS. at
http://indico.cern.ch/contributionDisplay....nId=23&confId=0
.

The major work on my part was modifying the divergent application SixTrack
to get identical floating-point results thanks to the elementary function
library (libm equivalent) crlibm from the Ecole Normale Superieure in Lyon,
implementing an efficient checkpoint/restart, and providing an easy to use
environment for creating, submitting, monitoring and processing the
thousands of jobs and results.

CPSS was put into production in the IT Department and by other volunteers
at CERN (I offered a free lunch for two to the largest contributor) but was
never deployed CERN wide in spite of Management Board Approval.

Another colleague suggested using BOINC; he had a server set up by students,
who did a very good job, and I modified SixTrack to use the BOINC API and the
run environment to use the parameterised shell script they provided to
submit the work. There was also a test server for testing modifications
before going into production. This ran very well for a couple of years,
although we never had enough work even to keep the smaller number (at that time)
of volunteers happy. This is described in Massive Tracking on Heterogeneous
Platforms at http://boinc.berkeley.edu/MOM1MP01.pdf. Then the server was moved
from CERN, I do not know why, and the test system disappeared.
The server was upgraded in some way and a new problem showed up which has never
been resolved. Some results, perfectly numerically valid, are rejected and no
credit is given. I have tried to test this, but without a test server........
All I can say is that apparently valid studies which work on CPSS and LSF never
get results from LHC@home.

The studies called lhca, lhcamps and lhcboinclongname seem to
work fine as do those of my ABP colleagues. The studies called lhcb, lhcboinc
and lhcboind never return results! For your information the Work Unit name you
see is constructed as follows:
workspace__study__seed__s__tune__amplitudes__eturns__angle_1_sixvf_uniqueid
So, for example, the work unit
wjuly_lhca__5__s__64.28_59.31__14_16__5__45_1_sixvf_boinc17041
is from workspace wjuly, study called lhca, seed no 5, tunex|y 64.28_59.31,
amplitude range 14 to 16, 10^5 turns, phase space angle 45, and I have assigned,
unique to this workspace, a platform and ID of boinc17041.

Even worse, after six weeks of intense collaboration with colleagues at
Brookhaven National Laboratory (BNL) we made a new SixTrack executable
for studying an electron lens, of great interest for a possible LHC upgrade.
We have never been able to use this new executable which would have produced
a very significant increase in the workload.

In summary, there has been no progress for four months now and no messages
or thanks to the message boards. ABP is now trying to raise the issue at
CERN and get the server sorted out.

In 1996 the LHC External Review committee recommended more extensive tracking
studies should be performed, they were run on a dedicated 10 processor
Digital Alpha system (costing a few hundred thousand), later augmented by 10
Alpha workstations (one hundred thousand), and later replaced by 64 dual
processor PCs. The capacity provide by CPSS and BOINC, basically free, is
some orders of magnitude greater. CERNs money and manpower, millions of
currency units and hundreds of man years, is devoted to the GRID, in order to
handle the huge volumes of data expected from the LHC experiments.
For whatever reason, not invented here, not an official project,a distraction
from the GRID, BOINC and CPSS have never been supported except by volunteers
and the original students.

I consider this rather tragic given the huge public relations potential
and the enormous capacity now available for tracking studies. I can only
apologise once again and I hope we can sort it all out soonest.

Finally, I am hoping to implement some very simple but realistic graphics
which would show the progress of the Work Unit. This would hopefully
be available on both Linux and Windows and the right system would
enormously simplify the building of the Windows executable.

I would also love to know how to print the BOINC documentation
in a simple way, without spending a lot of time searching and printing
a bit at a time. I am an old man and I am used to paper but feel I may
have to become much more involved in the BOINC server support.

Eric McIntosh.

Frederick (Eric) McIntosh almost failed his degree in Mathematics at the
University of Glasgow in 1962. He first worked for English Electric Computers
Limited on the DEUCE and KDF9 machines. He joined CDC (and Seymour Cray)
in 1964 and worked with the Serial 3 6600 at CERN. He joined CERN in
1967 and apart from 1976, a sabbatical of one year at the European Centre
for Medium Range Weather Forecasting, has worked at CERN ever since until
his retirement in 2006. During this time he performed applications and
systems support on CDC, Cray, IBM and Digital mainframes, workstations,
the MEIKO CS-2 128 processor parallel system, and finally PCs.
He is now an Honorary (unpaid :-) Group Member of ABP who provide him with
an office and a couple of PCs. His current aim is to extend the above
mentioned work on floating-point arithmetic to get identical results on
ANY IEEE 754 compatible processor (including CUDA) with a variety of
FORTRAN/C compilers. This would remove the LHC@home dependence on the
Lahey-Fujitsu lf95 and allow the use of architectures supplementary to
the INTEL and AMD 32/64 bit processors and in particular MACs.

2 Mar 2009

[Rilian]

Dear All; I did promise to try and update you regularly but frankly there has been nothing to report,
and in this case no news is bad news.
Memos have not been answered, and worse,no action has been forthcoming.
Before leaving for two weeks vacation I can say that protons and lead ions have been
successfully injected into a sector of the LHC and so far
it looks like there might be a start up with one beam at reduced energy in a few weeks time.
On the computing front I shall just paste an extract from my message to the accelerator physicists
(BOINC/LHC@home users) yesterday.

I would also say that my worst fears are coming to pass. The LSF system is becoming heavily loaded
and the LHC hasn't even started yet. CPSS is down to less than 100 active volunteers and LHC@home support
has been dead for a year and it appears unlikely that IT will support it.
The Management Board recommendation would have given us about 5000 CPUs equivalent with CPSS.
LHC@home could have provided well over 100,000 as it has done in the past.
I did implement the GRID once but the IT recommended Glite has been replaced by Ganga.
Anyway the GRID will hopefully be full of LHC data.
All this, taken with the general decline in IT/RedHat? Linux support
and the SLC5/64-bit fiasco leaves me rather depressed.



We have not given up completely yet but I do hope someone with real authority and responsibility
will give you the proper explanation that you deserve.

1 Nov 2009

[Rilian]

несмотря на то шо сайт не выдает ВЮ уже год, нас предупредили о кратковременном даунтайме...

2010-01-04: The server will be down from 5pm GMT on the 8th of January and should be back up and running by 11am on 11th of January.Sorry for the interruption there will be no power in the department over the weekend.