1) Message boards : Sixtrack Application : Tasks available / tasks not available (Message 41542)
Posted 12 Feb 2020 by Alessio Mereghetti
Post:
Hi all,
apologies for the late reply.

Most of our users are analysing the simulation results, and making up their mind on the next steps.
One of our users has been submitting short tasks (10^5 turns jobs), and he should be submitting longer jobs (10^6 turns) before the end of the week, filling all the buffers.

Thanks a lot for your support!
Happy crunching,
Alessio
2) Message boards : Sixtrack Application : Tasks available / tasks not available (Message 41307)
Posted 20 Jan 2020 by Alessio Mereghetti
Post:
Hi Geoff Harmer,
what replied by AuxRx is correct - I will add that the presently active SixTrack users are analysing the results you have produced and deciding the next batch of submission. Thanks for your time and CPUs!
Happy crunching,
A.
3) Message boards : Sixtrack Application : Tasks available / tasks not available (Message 41178)
Posted 6 Jan 2020 by Alessio Mereghetti
Post:
yes, we did not have enough in the buffer to cover the entire Christmas break.
one of our users resumed submission at the beginning of January - production of SixTrack results is back to full-steam, we are now filling our buffers.
Happy crunching!
A.
4) Message boards : Number crunching : Bandwidth and ram for vb and native tasks? (Message 41177)
Posted 6 Jan 2020 by Alessio Mereghetti
Post:
Hi,
I just remind that SixTrack tasks are CPU-intensive only (with some use of the HD for C/R), with very limited bandwidth requirements and negligible internet access - just to download input files (typically <1MB) or upload results (typically <100kB), no 24/7 access.
Cheers,
A.
5) Message boards : Sixtrack Application : Server Status (Message 40990)
Posted 17 Dec 2019 by Alessio Mereghetti
Post:
Hi,
apologies for the wrong number of tasks in the queue - this was due to tasks in the BOINC DB orphans of their WUs due to a WU deletion back in summer.
I have just cleared them out - at the next server status update, you should see that the sixtrack queue has been drained out.
Thanks for spotting this,
Cheers,
A.
6) Message boards : Sixtrack Application : No more workspace1_HEL_Qp_2_MO_0_1t_3s_1e7turns_BOINC tasks for my small laptop (Message 40934)
Posted 13 Dec 2019 by Alessio Mereghetti
Post:
Hi Ray,
yes you are right. But this batch of 10^7 turns jobs were submitted (wrongly) to sixtrack instead of sixtracktest, with the default of 1w of delay bound. On sixtracktest we have presently 2w.
But it would have been not respectful towards those users with hosts capable of crunching the tasks on time which have already started crunching them, or even producing results. Hence, I let them go...
I will remind the users to load sixtracktest and not sixtrack for this kind of studies.
Happy crunching,
Cheers,
A.
7) Message boards : Number crunching : retirement (Message 40933)
Posted 13 Dec 2019 by Alessio Mereghetti
Post:
Thanks a lot for your dedication, and for letting us use this machine, which gained ~3M credit!
Happy crunching,
A.
8) Message boards : Sixtrack Application : Wrong Factor sent by Project Server (Message 40911)
Posted 12 Dec 2019 by Alessio Mereghetti
Post:
Hi,
sorry for the late reply. Recently we had some changes on the SixTrack app, but everything was before uploading work to the BOINC server.
On the server side, the only change was the update of the estimation of the host speed - which is done now for all hosts (no longer only 1) which have provided valid results, for which all particles survive. I do not think that this update can have an affect on the
avg_ncpus
parameter.

Both my Ubuntu hosts (running only sixtrack and sixtracktest) do not have a
app_config.xml
file, and all the places where
avg_ncpus
is set, it is always set to 1.
I can check also a windows machine of mine, but I don't have access right now...
9) Message boards : Sixtrack Application : No more workspace1_HEL_Qp_2_MO_0_1t_3s_1e7turns_BOINC tasks for my small laptop (Message 40886)
Posted 10 Dec 2019 by Alessio Mereghetti
Post:
Hi Sesson,
apologies for that. Yes, you are right, the deadline of 7 days is too tight for this kind of studies, and at submission this parameter was left behind.
Please feel free to abort any of these tasks or temporarily detach your laptop from SixTrack for let's say a week.
Thanks for your understanding,
Cheers,
A.
10) Message boards : Sixtrack Application : SIXTRACKTEST (Message 40748)
Posted 2 Dec 2019 by Alessio Mereghetti
Post:
that's interesting, though a-priori not excluded to me - but I have no experience with the VM set-up of the experiments (i.e. CMS, ATLAS)
...unless it is a VM interacting directly with the server - I have a windows one on my Ubuntu laptop...
11) Message boards : Sixtrack Application : SIXTRACKTEST (Message 40703)
Posted 27 Nov 2019 by Alessio Mereghetti
Post:
Hi Ray,
thanks for pointing this out, good catch.
Yes, all the tasks pin v5.02.07, which has only Mac exes.
I am plugging in Win/Lin 64 bit exes, just to enlarge the parterre of volunteers and crunch this wave of tasks faster.
You should be able to get tasks soon.
Cheers,
A.
12) Message boards : Number crunching : fubar host of the day (Message 40502)
Posted 18 Nov 2019 by Alessio Mereghetti
Post:
Hi,
thanks for pointing those hosts out - very precious and careful job!

The first guy seems to have resume regular activity:
https://lhcathome.cern.ch/lhcathome/results.php?hostid=10614857

The other one:
https://lhcathome.cern.ch/lhcathome/results.php?hostid=10614261
is still in an error phase, probably related to issues with their network - I will contact the owner privately.

Thanks a lot in advance,
Cheers,
A.
13) Message boards : Sixtrack Application : Are there FreeBSD SSE2 apps available for FreeBSD? (Message 40329)
Posted 30 Oct 2019 by Alessio Mereghetti
Post:
What I am sure about is that:
1. we did compile SixTrack for FreeBSD, both with avx and sse2 instruction sets;
2. we did put the executables in the BOINC DB for distribution and use.
Both of them can be found on the apps page:
https://lhcathome.cern.ch/lhcathome/apps.php

With the statistics on your host presently available, your host did run 3 tasks with FreeBSD - I cannot claim that your host is running the FreeBSD app right now, as there might be some latency in all the update operations of the BOINC DB.
https://lhcathome.cern.ch/lhcathome/host_app_versions.php?hostid=10571128

At the time of writing, I do see you have 2 tasks in progress, both with a FreeBSD exe:
https://lhcathome.cern.ch/lhcathome/result.php?resultid=250082076
https://lhcathome.cern.ch/lhcathome/result.php?resultid=250091388

I am not sure you will be able to check the exe of these two tasks right now due to the difference in time zone between you and the project.
Nevertheless, to better understand the issue, could you please point me to a case where you find a linux exe for a task which is recorded in the BOINC DB as to be run with the FreeBSD exe?
You should find the task name in both the init_data.xml and boinc_task_state.xml files - e.g. one of mine:
$ grep -ir result 1
1/fort.6:BEAM> tical results to this one.
1/fort.6:BEAM> the standard output in a text diff tool like meld. If the results are not identical,
1/init_data.xml:<result_name>workspace1_hl14_HighResNominal_B1__15__s__62.31_60.32__4.2_4.3__6__31_1_sixvf_boinc216889_1</result_name>
1/boinc_task_state.xml:    <result_name>workspace1_hl14_HighResNominal_B1__15__s__62.31_60.32__4.2_4.3__6__31_1_sixvf_boinc216889_1</result_name>


Thanks a lot in advance,
Cheers,
A.
14) Message boards : Sixtrack Application : Are there FreeBSD SSE2 apps available for FreeBSD? (Message 40309)
Posted 29 Oct 2019 by Alessio Mereghetti
Post:
Hi,
thanks for the question. Yes, we have a genuine sse2 FreeBSD executable:
https://lhcathome.cern.ch/lhcathome/apps.php
and your computer did use it:
https://lhcathome.cern.ch/lhcathome/results.php?hostid=10571128

The stats suffer from too few tasks being crunched (both with sse2 and avx) for different reasons:
https://lhcathome.cern.ch/lhcathome/host_app_versions.php?hostid=10571128
In one case you had very short tasks, simulating a very unstable beam, hence they are not used to update the performance of the exe on your host. For the other exe, the tasks look like fully stable beam, hence making the performance estimate of the exe sensible; nevertheless, no validation has taken place yet - and we need to validate results first before updating figures on performance.

Concerning the users with FreeBSD without Linux compatibility layer, I guess they will get the true FreeBSD exes. Do you want to switch it off and git a trial to the setup?

Hope it helps,
Cheers,
A.
15) Message boards : Sixtrack Application : Can Sixtrack use a GPU for processing? (Message 40308)
Posted 29 Oct 2019 by Alessio Mereghetti
Post:
Hello,
please check the recent reply by Riccardo on the MB on the same subject but in a different thread:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5173
Thanks a lot in advance,
Cheers,
A.
16) Message boards : Sixtrack Application : Sixtrack Badge (Message 40253)
Posted 23 Oct 2019 by Alessio Mereghetti
Post:
Dear all,
thanks for the question. We have never looked into this for SixTrack, we will do that, in collaboration with the IT guys.
Thanks for the suggestion!
Cheers,
A.
17) Message boards : Sixtrack Application : Very long Tasks (Message 40115)
Posted 10 Oct 2019 by Alessio Mereghetti
Post:
The issue with those tasks has been addressed here:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=4690

We had a problem with the setting up of a bunch of simulations with 1^7 turns, and a log file was eating up all the disk quota.
The user was not aware that sixtrack was producing that log file, and how to update the request.
Hence, I have decided to manually attribute credit to those tasks based on the CPU time via the --credit_from_runtime option of the BOINC validator.
I should have also given credit to your tasks, but I had a malformed query to the DB - now everything should be properly set, and you should see credit to those tasks.

Thanks a lot in advance,
Happy cruncing,
A.
18) Message boards : News : The SixTrack team at the LHC@Home desk for the CERN open days (Message 40099)
Posted 9 Oct 2019 by Alessio Mereghetti
Post:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5130&postid=40098#40098
19) Message boards : News : The SixTrack team welcomes the LHC@Home volunteers at the CERN open days (Message 40098)
Posted 9 Oct 2019 by Alessio Mereghetti
Post:
Dear all,

Thanks a lot to those who managed to pass by the desk and attend the presentations. Even though I was not there in person, the present team members were delighted to meet you all and to spend time together on how we use the CPUs you make available to us.

You can find the slides in our webpage dedicated to publications:
https://lhcathome.web.cern.ch/projects/sixtrack/publications-presentations

We have also taken the chance to review our info page at:
https://lhcathome.web.cern.ch/projects/sixtrack

We are deeply grateful for your continuous support.
Happy crunching!
Alessio, for the SixTrack team
20) Message boards : Number crunching : LHC on android (Message 40088)
Posted 8 Oct 2019 by Alessio Mereghetti
Post:
Hi Yeti,
sorry for the inconvenience. You are right, your host should have received tasks.
I am checking with the IT guys how your host is treated by the BOINC server looking at the cgi/feeder logs.
We will come back to you once we have news.
Thanks,
Cheers,
A.


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