Source:  Gerasim@home
jeudi 2 février 2017 08:16

Another our article was published:

Vatutin E.I., Zaikin O.S., Zhuravlev A.D., Manzyuk M.O., Kochemazov S.E., Titov V.S. Using grid systems for enumerating combinatorial objects on example of diagonal Latin squares // CEUR Workshop proceedings. Selected Papers of the 7th International Conference Distributed Computing and Grid-technologies in Science and Education. 2017. Vol. 1787.pp. 486–490. urn:nbn:de:0074-1787-5.

Source:  Gerasim@home
dimanche 22 janvier 2017 15:18

 Запущен новый короткий эксперимент, целью которого является анализ комбинаторных характеристик диагональных латинских квадратов порядка 8.

The new short experiment was started. It is aimed to investigate some values of combinatorial characteristics for diagonal Latin squares of order 8.

ECM@ARM error, you need more swap
Source:  yoyo@home
mercredi 11 janvier 2017 00:00

Since ECM runs also on ARM I see many error on such systems. Thosesystems are mostly small single board systems as Raspberry Pi or Odroids. They have many cores but less RAM and mostly no swap. The ECM wokunits consume less RAM at the beginning but after some time require adhoc 1 or 2 GB of RAM. Boinc can handle it but not so fast as the RAM is allocated and running multiple ECM workunits in parallel makes it worse. They often allocate much RAM at the same time. tl;dr Configure more swap in your system. Consider the old rule swap size = 2 times RAM for systems up to 2 GB. Here a tutorial how to create more swap space:

ECM: native apps for ARM
Source:  yoyo@home
mercredi 4 janvier 2017 00:00

Since some days native ECM apps are available for ARM 64 and 32 bit Linux systems. No need anymore to install gmp-ecm package.

ECM: double credits for P2 workunits
Source:  yoyo@home
vendredi 23 décembre 2016 00:00

The ecm P2 workunits require up to 10 GB RAM. Because of this they get double credits. Systems with less RAM should not get them.

Heat Wave in the Arctic
jeudi 22 décembre 2016 10:35

The Arctic is currently experiencing a heat wave with temperatures forecasted to be more than 20 ºC above normal, following a very warm November and December. Such a heat wave has dramatic consequences for the local ecosystem and is also a striking example of how climate change is impacting the world today.



Historical temperature records reveal that the Arctic is warming more than twice as fast as the rest of the planet. Still, the recent heat and record-low sea ice for this time of the year are extreme departures from what has become normal now.

As part of the World Weather Attribution (WWA) team CPDN scientists have looked at observational data and model simulations, including weather@home to identify whether and to what extend human-induced climate change influenced the likelihood and magnitude of this extreme event.

The results the team found are that human-induced climate change is intensifying both the heat in the Arctic and increasing the frequency of such unusually warm periods. The analysis revealed that the temperatures experienced this November and December in the Arctic would have been extremely unlikely before the pre-industrial, pre-global warming days of the 1800s. This current North Pole heat event is still a rare occurrence — roughly two percent chance every year — even in our warmer world of today. Looking into the future, we found that, if nothing is done to slow climate change, by the time global warming reaches 2 ºC events like this winter would become common at the North Pole, happening every few years. Read the full analysis here.

Media coverage:

Carbon Brief

The New York Times

The Conversation

The Guardian



ECM: new version 700.02 for 64 bit Windows
Source:  yoyo@home
mercredi 21 décembre 2016 00:00

On 64 bit Windows version 700.02 is twice as fast as version 700.01. You should cancel all 700.01 tasks to get version 700.02.

OGR 25% done
Source:  yoyo@home
lundi 19 décembre 2016 00:00

Over the weekend, we passed 25% of the total work required to prove OGR-28. Also, we opened the 18-x stub space. :) Thank you for all of your efforts. Moo!

Project News 29 november 2016
Source:  Leiden Classical
mardi 29 novembre 2016 00:00

This morning the mysql database was found to be corrupt. It has been restored from the dump made at midnight. The restore took some time.

Source:  Gerasim@home
mardi 22 novembre 2016 09:52

Перед конференцией в Переславле мы подготовили подробную презентацию, которая охватывает весь объем работы, который был проделан нашей командой в задаче перечисления ДЛК до N<10.

Before National Supercomputing Forum in Pereslavl-Zalessky wa are prepare detailed presentation that describes all our work aimed to enumerating of diagonal Latin squares of order N<10.