1) Message boards : Number crunching : We will NOT be crunching the results of the LHC collisions (Message 22210)
Posted 8 Apr 2010 by Profile Neasan
Post:
Also there is an LHC upgrade being planned for 2 years time and some time after that. They will need to do new beam studies for that too so we will be (are) crunching that.
2) Message boards : Cafe LHC : Time travel (Message 22173)
Posted 1 Apr 2010 by Profile Neasan
Post:
OK I get it I screwed up the dates, they\'re fixed now.
3) Message boards : Number crunching : Front page server status box is stuck (Message 22172)
Posted 1 Apr 2010 by Profile Neasan
Post:
A cron job had died apparently, should be fixed now.
4) Message boards : Number crunching : I tried to warn you..... (Message 22171)
Posted 1 Apr 2010 by Profile Neasan
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OK I\'m being slow ....
5) Message boards : Number crunching : Computation error (Message 22170)
Posted 1 Apr 2010 by Profile Neasan
Post:

And what news is that? A bogus notice placed some time ago that they are looking into the problem and dates of messages that aren\\\'t even valid? How hard is it to post an update with real dates that mean anything? Or to correct a programming mistake from over a month ago? Sorry but that\\\'s a rediculous amount of time to fix such errors.

I had high hopes for this project when it finally returned after a year hiatus. But without the great screen saver (that got many of it\\\'s members interested to start with), it\\\'s just another one of the poorly organized projects with no clear purpose or updates from it\\\'s staff. It\\\'s too bad no one at LHC is really concerned enough to keep anyone informed or even to do a simple job of updating the front page with valid dates that anyone can understand. Updates should be at least weekly and not be so vague as to be meaningless.

It\'s \"staff\"? You mean one retired physicist, and two unpaid volunteers who do this in their spare time? So I made some mistakes typing in some dates, the world isn\'t going to end. A solution is being looked at but currently our day jobs (i.e. the actual LHC, you knwo that thing that is now up and running after ~20 years of planning) is kind of taking a lot of our time because we are paid to work on that and our bosses expect us to do our jobs.
6) Message boards : Number crunching : Long time pending credits (Message 22169)
Posted 1 Apr 2010 by Profile Neasan
Post:
On the to-do list but not a high priority at the moment sadly. We are looking at the database currently as well as the server upgrade so these might both result in them being cleaned up.
7) Message boards : Number crunching : We will NOT be crunching the results of the LHC collisions (Message 22168)
Posted 1 Apr 2010 by Profile Neasan
Post:
Alex and Chaz are both correct.

Currently there are no plans to crunch LHC data (as I have pointed out a few times now) also the crunching for thelat few years has directly benefited the LHC resulting in the relatively easy start of the LHC (not counting incidents involving birds or sodlering) with regards how quickly they have been able to control the beam
8) Message boards : LHC@home Science : FIRST collisions at 7TeV! (Message 22167)
Posted 1 Apr 2010 by Profile Neasan
Post:
Yeah sorry, was a bit hectic last few days and typing when rushed not my strong point and I was trying to get the news item up just as we had confirmed the collisions.
9) Message boards : Number crunching : I tried to warn you..... (Message 22113)
Posted 24 Mar 2010 by Profile Neasan
Post:
I need to pay more attention to those pesky dates. Just saw it before I saw this topic. Fixed now and new news item up.
10) Questions and Answers : Getting started : Never got WU\'s (Message 22098)
Posted 19 Mar 2010 by Profile Neasan
Post:
The information in this topic is still valid:
http://lhcathome.cern.ch/lhcathome/forum_thread.php?id=2261
11) Message boards : Number crunching : Maximum elapsed time exceeded (Message 22090)
Posted 17 Mar 2010 by Profile Neasan
Post:
The time limit is how long a WU should take to process and if it hasn\\\'t something is broken and it is cancelled. LHC@home WUs are usually short enough so we had ~24hours as the crunching time, however the new work takes longer than that (which we were unaware of at first).

It is NOT the deadline (results back by a certain date).

Aah, now I see. In that case, perhaps an absolute limit is simply the wrong approach; a better way might be to check on the completion percentage periodically - stop the WU if it hasn\\\'t gone up at all in a while, or if it hasn\\\'t gone up more than some reasonable limit. Of course, that only works if the application is multithreaded, if you can tell BOINC to check up on it in that kind of detail, or if you can change the internal loops to check on themselves periodically to avoid deadlock.


It wasn\'t an absolute limit it used some kind of algorithm when the job was created to set the time and the new jobs broke this calculation AFAIK. Tis sorted now and bigmac is trying to make sure it won\'t happen again.
12) Message boards : Number crunching : Maximum elapsed time exceeded (Message 22083)
Posted 15 Mar 2010 by Profile Neasan
Post:
What is this time limit, anyway? The WU deadline? The only reason to decrease that would be ensure that BOINC reports the results more quickly after the WUs have finished - is that really such a big issue?

All I know is that it was initially reduced (at the beginning of the project) after feedback from volunteers.

The time limit is how long a WU should take to process and if it hasn\'t something is broken and it is cancelled. LHC@home WUs are usually short enough so we had ~24hours as the crunching time, however the new work takes longer than that (which we were unaware of at first).

It is NOT the deadline (results back by a certain date).
13) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks. (Message 22075)
Posted 15 Mar 2010 by Profile Neasan
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.

The LHC@home database/server should answer pretty much all those questions we\'re trying to pull them out at the moment.
14) Message boards : Number crunching : Computation error (Message 22052)
Posted 12 Mar 2010 by Profile Neasan
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There has been no update.

Let me have a discussion with some people.
15) Message boards : LHC@home Science : Black hole question (Message 22046)
Posted 11 Mar 2010 by Profile Neasan
Post:
This is the first \"new physics\" from the LHC:
http://arxiv.org/abs/0911.5430

It is a paper from the ALICE experiment. However as previously said LHC is in test and tune, once we get 7TeV collisions in the next few weeks *fingers crossed* we will have some data for the scientists to analyse.

Graviton =/= Higgs Boson
16) Message boards : Number crunching : Another shut down (Message 22045)
Posted 11 Mar 2010 by Profile Neasan
Post:
This has always been the plan run at 7TeV for 2 years, shut down fix a few things then get back on for the 14TeV.

This is what the current LHC@home work is related to, they need to model the magnets at 14TeV with the new info we have from running at the latest energies.
17) Message boards : Number crunching : Two announcements (Message 22044)
Posted 11 Mar 2010 by Profile Neasan
Post:
Neasan, did you and Bigmac ever consider going the Linus Torvalds route and initiating a small project that the community itself would develop - at least as an experiment? Whether it is feasible or not and how many volunteers you would get is a very open question.


You mean the Particle Physics community? This is what we have been attempting (alongside applying for funding). If you mean the wider community i.e. you volunteers, we would still need input from particle physicists.

I am going to be making another push soon now that the LHC has settled down a little and find another application again.
18) Message boards : Number crunching : Modern computers behave in wildly unpredictable ways ... (Message 22043)
Posted 11 Mar 2010 by Profile Neasan
Post:
For BOINC? I don\'t know. For LHC@home? Probably nothing. bigmac is using libraries and methods so that all computers will give back identical results even down to 15 decimal places or more. I can\'t find the paper at the moment but he just gave a seminar here at QMUL about it.
19) Message boards : Cafe LHC : Whatever happened to LHC@home....apologies and thanks. (Message 22027)
Posted 9 Mar 2010 by Profile Neasan
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As mentioned in the other thread, it is a known issue and we are trying to implement a solution.
20) Message boards : Number crunching : Waiting on Linux App (Message 22026)
Posted 9 Mar 2010 by Profile Neasan
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It is coming bigmac is working on it. Sorry for the delay, it could be a couple of weeks due to him going on holidays. However we are aware we need it ASAP.

Fair enough. I\\\'ll quit chucking rocks at the Windows then. :)

Now I never said Windows bashing was unnecessary ...


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