Posts by Eric Mcintosh

1) Message boards : Number crunching : best practices/how to get most efficiency for higher core machines (Message 45209) Posted 16 Aug 2021 by Eric Mcintosh Post: Hi, are you running SixTrack, virtually no I/O? Thanks. Eric
2) Message boards : Sixtrack Application : Program received signal SIGSEGV: Segmentation fault (Message 45103) Posted 4 Jul 2021 by Eric Mcintosh Post: Hi Erich, I see you have a fast large memory sytem This fault is either overheated system or a cosmic ray hit. I wish I could determine which...... I guess if the motherboard has SECDED it shouldn't happen. We shall see. Eric
3) Message boards : News : Database issues (Message 44618) Posted 30 Mar 2021 by Eric Mcintosh Post: Why don't you just put a second server in parallel!!! Eric
4) Message boards : Number crunching : How many resources (Message 44571) Posted 27 Mar 2021 by Eric Mcintosh Post: How can I figure out the total resources provided by BOINC for SixTrack? and/or to CERN in general. Thanks. Eric
5) Message boards : Cafe LHC : Inactive for a while (Message 44369) Posted 22 Feb 2021 by Eric Mcintosh Post: Sorry to say I am suffering short term memory loss. I am no longer authorised to manage LHC@home. My colleagues are taking care of it. Eric
6) Message boards : Cafe LHC : Status 2020 (Message 41702) Posted 23 Feb 2020 by Eric Mcintosh Post: Dear All, thank you for your continued support. I hope you had a Merry Christmas and I wish you a Guid New Year. I am back, but rather slow, after my recent heart operation. My priority is to publish "IEEE 754 as intended - or how to obtain identical double precision floating-point results". SixTrack LHC@home is running well but tasks are still being taken rather slowly and I reckon we use, at best, one third of your provided capacity. Still your support is vital for the High Luminescent LHC studies. Personally I have a couple of issues: I need to access old migrated data to define SixTrack performance and this is a problem right now. While the Invalid result error rate is in general very low, 24 Invalid and over one million valid today, I need to identify the genuine computational errors. You can find my recent CERN Open Days presentation at http://mcintosh.web.cern.ch/mcintosh/ along with the state of my research. Eric
7) Message boards : News : The SixTrack team welcomes the LHC@Home volunteers at the CERN open days (Message 39940) Posted 16 Sep 2019 by Eric Mcintosh Post: Hi Eddie, our presentations are coming. I am making a big effort on our WWW pages. GPUs.....we can run, but I'll expand on this later. Old GPU's are not IEEE 754. The memory requirement becomes large, as do the sizes of the result files. Thanks for your support.. Eric
8) Message boards : News : The SixTrack team welcomes the LHC@Home volunteers at the CERN open days (Message 39939) Posted 16 Sep 2019 by Eric Mcintosh Post: Hi Nicholas, I'm a bit late too tell you where. Many many people had difficulty finding us, and not just us. There was a crazy system of naming ME23, ME15, etc etc. You needed a smart phone to have any chance. I am complaining to organisers, why was there NO MAP! We had only half the volunteers expected on Saturday, around 10, and 3 on Sunday. Never mind we shall shortly post our presentations on the WWW with links from here, the MBs. Yes, your CPU will get hot. SixTrack is CPU intensive. Many systems throttle back the CPU(s) when the temperature rises. Thanks for your support. Eric
9) Message boards : Sixtrack Application : SIXTRACKTEST (Message 39914) Posted 13 Sep 2019 by Eric Mcintosh Post: Thanks, excellent feedback. Memory requirement could be reduced by tracking fewer particles in the task. Memory management in SixTrack is now dynamic. There must be something wrong with our memory estimate I think. In the first place we should avoid using all your memory and a potential deadlock........We shall see. Eric.
10) Message boards : Sixtrack Application : Inconclusive results (Message 39766) Posted 30 Aug 2019 by Eric Mcintosh Post: Hi Stick, yes this is a real pain in the neck. Seen it often. Maybe our support can improve this after other really major scheduling and task distribution are solved. Apologies. Eric
11) Message boards : Cafe LHC : McIntosh (Eric) is back (Message 39733) Posted 25 Aug 2019 by Eric Mcintosh Post: Dear All, thank you for your messages and for all the encouragement. As I said, I shall be at the CERN Open Days, 14th and 15th September, and hope to make or renew some personal contacts. In the meantime, I am hoping IT can resolve the database issues as we have lots of work to run. Eric
12) Message boards : LHC@home Science : CERN Open days 2019 (Message 39730) Posted 25 Aug 2019 by Eric Mcintosh Post: God Willing Weather Permitting, I shall be there, and looking forward to meeting you. Eric.
13) Message boards : Cafe LHC : McIntosh (Eric) is back (Message 39693) Posted 23 Aug 2019 by Eric Mcintosh Post: After various problems and some major heart surgery I am back in business. I shall be confining myself to writing THE paper on result reproducibility, but still keeping an eye on LHC@home and in particular on invalid results or validation failures. My (young :-) colleagues have done a fantastic job on SixTrack during my absence. It is now almost Fortran 2008, much more modular and a great deal of new functionality. We are exploring the possibility of performing ten million turns, but with the work split into batches of say one hundred thousand turns. There is a big question here about the amount of network activity required, as against the length of the task. That's it for now, more news in the SixTrack thread whenever. Eric
14) Message boards : LHC@home Science : CERN Open days 2019 (Message 39155) Posted 20 Jun 2019 by Eric Mcintosh Post: CERN Open Days 2019 \| 14–15 September (early heads up) On 14 and 15 September 2019, CERN will open its doors to the public for two special days at the heart of one of the world’s largest particle-physics laboratories. The CERN Open Days have become a regular feature of the period that we call the “long shutdown” during which our accelerators stop for around two years, to benefit from upgrades and renovation work. We are now in Long Shutdown 2. The 2019 Open Days will give visitors the chance to discover our facilities, both underground and on the surface. With free admission to debates, film screenings, theatre performances, experimental workshops and dozens of visit points spread all over the site, we will take you to the heart of our Laboratory, in direct contact with the science of today and tomorrow.
15) Message boards : Sixtrack Application : Errors on sixtrack tasks (Message 32642) Posted 6 Oct 2017 by Eric Mcintosh Post: OK, thanks again. James has deleted the erroneous tasks. Eric.
16) Message boards : Sixtrack Application : Errors on sixtrack tasks (Message 32636) Posted 5 Oct 2017 by Eric Mcintosh Post: Thanks Harri; looks like a genuine "physics" problem..... I shall be seeing James, the user, today I hope. Eric.
17) Message boards : Sixtrack Application : SIXTRACKTEST (Message 32591) Posted 2 Oct 2017 by Eric Mcintosh Post: Hi, it is dear to my heart to be as inclusive as possible. I'll see if I can build on an old Linux system of mine, and especially for my "dear old" 32-bit systems. No promises, but I should have news in a week or so. (There might be compiler problems/bugs on these ancient platforms. I am aware of the horrible bind between new hardware requiring new software and new software requiring new hardware! I am against the "throw away" culture to the limits of the possible.) . Eric.
18) Message boards : Sixtrack Application : More Work (Message 32589) Posted 2 Oct 2017 by Eric Mcintosh Post: I'll try and find out. I'll be putting more work but I need to sort out the new procedures for running specific cases and for getting back all the result files before running more and longer cases. Hopefully only a few days. Eric.
19) Message boards : Sixtrack Application : More Work (Message 32500) Posted 22 Sep 2017 by Eric Mcintosh Post: Well, I have painfully managed to download all existing results and I am now submitting more work as best I can. The new executables look very good from the CERN side, but since Invalid and other failed results are now deleted I have a problem in analysing these errors since the results never reach me. I shall be trying to use the validator log in the meantime. Shame as the new execs return the stderr which is a big help. Eric.
20) Message boards : Sixtrack Application : More Work (Message 32498) Posted 22 Sep 2017 by Eric Mcintosh Post: I am trying but the CERN file system keeps killing my procedures! Eric.

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