Skip to main content

Novinky z projektov

Stockholm Science & Innovation School Competition Donates 25 Years of Computing Time to Cancer and Microbiome Research

World Community Grid - Št, 15.08.2019 - 20:12
A high school in Sweden chose to support Mapping Cancer Markers and the Microbiome Immunity Project during a one-month competition between five World Community Grid teams. Here’s what they learned during the process.
Kategórie: Novinky z projektov

Acemd apps should be fixed

GPUGRID - So, 10.08.2019 - 20:17
We are aware of the problem and working on it. Sorry for the inconvenience.
Kategórie: Novinky z projektov

Be careful with BOINC computers on the Internet

PrimeGrid - St, 07.08.2019 - 22:41
A lot of us use Cloud servers such as AWS, or make our home computers or our computers at work accessible on the Internet so we can control their BOINC clients remotely. I was looking through the logs of some Azure servers I have running BOINC, and saw this on one of them: 10316 8/7/2019 11:39:23 AM GUI RPC request from non-allowed address 2.0.25.129 10648 8/7/2019 1:09:27 PM GUI RPC request from non-allowed address 2.0.42.193 10649 8/7/2019 1:09:27 PM 256 connections rejected in last 10 minutes In fact, a similar address (somewhere in France, supposedly) tried to connect to the BOINC client on four of my BOINC machines. This has been happening since at least July. If the BOINC client on your computers is accessible from the Internet, I advise putting your specific IP address (or addresses) into remote_hosts.cfg rather than leaving it open to the world, or doing the same in a firewall (or both). And use a strong password. If you don't think this is important... anyone who successfully connects to the BOINC client on your computer can attach it to their own BOINC server, which can then send it tasks that can easily install malicious payloads such as key loggers, spam relays, DDOS bots, and other bad stuff. EDIT: If this is all Greek to you and you don't know what I'm talking about, you're probably not at risk. BOINC starts off with remote access disabled. You have to explicitly go and change configuration files to enable remote access, and probably modify your firewall as well. If you haven't done that, you're okay.
Kategórie: Novinky z projektov

New Expanded Runs for Milkyway_nbody (08/06/2019)

Milkyway@Home - Ut, 06.08.2019 - 17:32
Hello all,

I've just placed two new runs up onto MilkyWay@home:
-de_nbody_08_06_2019_v176_40k__dataExpand__1
-de_nbody_08_06_2019_v176_40k__dataExpand__2

These runs are going to search over a larger phase space, however, due to the technological limitations of simulating incredibly dense dwarf galaxies, a significant portion of this phase space will be skipped. This limitation has been placed in previous runs using the current version of Milkyway_nbody, however, the larger phase space will make this more apparent. We set up our lua file such that runs with abnormally long runtimes will only take a few seconds to complete and return the worst case likelihood score. As credits are calculated dynamically for Nbody, it may take a few runs for Milkyway@home to assign the proper amount of credits. We plan on adding another expanded data run once de_nbody_07_10_2019_v176_40k__data__7 converges.

Thank you for your support,

Eric
Kategórie: Novinky z projektov

Thanks for supporting SixTrack at LHC@Home and updates

LHC@home - Ut, 23.01.2018 - 19:08
Dear volunteers,

All members of the SixTrack team would like to thank each of you for supporting our project at LHC@Home. The last weeks saw a significant increase in work load, and your constant help did not pause even during the Christmas holidays, which is something that we really appreciate!

As you know, we are interested in simulating the dynamics of the beam in ultra-relativistic storage rings, like the LHC. As in other fields of physics, the dynamics is complex, and it can be decomposed into a linear and a non-linear part. The former allows the expected performance of the machine to be at reach, whereas the latter might dramatically affect the stability of the circulating beam. While the former can be analysed with the computing power of a laptop, the latter requires BOINC, and hence you! In fact, we perform very large scans of parameter spaces to see how non-linearities affect the motion of beam particles in different regions of the beam phase space and for different values of key machine parameters. Our main observable is the dynamic aperture (DA), i.e. the boundary between stable, i.e. bounded, and unstable, i.e., unbounded, motion of particles.

The studies mainly target the LHC and its upgrade in luminosity, the so-called HL-LHC. Thanks to this new accelerator, by ~2035, the LHC will be able to deliver to experiments x10 more data than what is foreseen in the first 10/15y of operation of LHC in a comparable time. We are in full swing in designing the upgraded machine, and the present operation of the LHC is a unique occasion to benchmark our models and simulation results. The deep knowledge of the DA of the LHC is essential to properly tune the working point of the HL-LHC.

If you have crunched simulations named "workspace1_hl13_collision_scan_*" (Frederik), then you have helped us in mapping the effects of unavoidable magnetic errors expected from the new hardware of the HL-LHC on dynamic aperture, and identify the best working point of the machine and correction strategies. Tasks named like "w2_hllhc10_sqz700_Qinj_chr20_w2*" (Yuri) focus the attention onto the magnets responsible for squeezing the beams before colliding them; due to their prominent role, these magnets, very few in number, have such a big impact on the non-linear dynamics that the knobs controlling the linear part of the machine can offer relevant remedial strategies.

Many recent tasks are aimed at relating the beam lifetime to the dynamic aperture. The beam lifetime is a measured quantity that tells us how long the beams are going to stay in the machine, based on the current rate of losses. A theoretical model relating beam lifetime and dynamic aperture was developed; a large simulation campaign has started, to benchmark the model against plenty of measurements taken with the LHC in the past three years. One set of studies, named "w16_ats2017_b2_qp_0_ats2017_b2_QP_0_IOCT_0" (Pascal), considers as main source of non-linearities the unavoidable multipolar errors of the magnets, whereas tasks named as "LHC_2015*" (Javier) take into account the parasitic encounters nearby the collision points, i.e. the so called "long-range beam-beam effects".

One of our users (Ewen) is carrying out two studies thanks to your help. In 2017 DA was directly measured for the first time in the LHC at top energy, and nonlinear magnets on either side of ATLAS and CMS experiments were used to vary the DA. He wants to see how well the simulated DA compares to these measurements. The second study seeks to look systematically at how the time dependence of DA in simulation depends on the strength of linear transverse coupling, and the way it is generated in the machine. In fact, some previous simulations and measurements at injection energy have indicated that linear coupling between the horizontal and vertical planes can have a large impact on how the dynamic aperture evolves over time.

In all this, your help is fundamental, since you let us carry out the simulations and studies we are interested in, running the tasks we submit to BOINC. Hence, the warmest "thank you" to you all!
Happy crunching to everyone, and stay tuned!

Alessio and Massimo, for the LHC SixTrack team.
Kategórie: Novinky z projektov

LHC@home down-time due to system updates

LHC@home - Ut, 23.01.2018 - 11:19
Tomorrow Wednesday 24/1, the LHC@home servers will be unavailable for a short period while our storage backend is taken down for a system update.

Today, Tuesday 23/1, some of the Condor servers that handle CMS, LHCb and Theory tasks will be down for a while. Regarding the on-going issues with upload of files, please refer to this thread.

Thanks for your understanding and happy crunching!
Kategórie: Novinky z projektov
Syndikovať obsah