[BOINC] [物理类] Einstein@Home

Youth

The E@H project will be down until a problem with the database is fixed. We expect all the problems to be worked out by Mon Oct 15 21:00 UTC.

数据库有点问题要停机维护一下，预期在北京时间16日凌晨五点结束。

Youth

The database problems have been fixed, and the Einstein@Home project is up and running again. Please note that a few contributors may notice some of their results in a strange or incorrect state. Please see this message board thread for more details and to report any problems.

数据库问题已修复，项目恢复正常运行。请注意有部分用户的计算结果可能会是不正确的状态。请看一下留言板中的这个帖子，有问题也请在那里报告一下。

http://einstein.phys.uwm.edu/forum_thread.php?id=6221#75973

Here is a quick summary of what happened in the past 8 hours:

An admin mistake (SQL command update result set outcome=6;validate_state=2 where id=84114386;) accidentally set all the results in the database into an outcome=validate error state (the first semicolon in the command should be a comma!).

SQL语句写错了。。。

I have corrected these as best as I could. There may be a few hundred results which are not quite in the correct state. Please bear with me while I correct these over the next few days.

已经修正了大部分错误的状态，剩下的会在接下来几天进行修复。

I have modified the reporting deadlines for any results that were due in the past 8 hours or the next 4 hours, advancing these deadlines by 12 hours. So results will not be marked as late because of this project downtime.

因为停机时间较长，这段时间要过期的任务包的完成期限也被适当延长了。

Hopefully my database repairs will be effective and most Einstein@Home contributors should not notice any problems or unusual behavior with the project.

Cheers,
Bruce

Youth

Einstein@Home will be shutdown for short while today while some updates are made to database. The work will begin at 14:10:00 UTC Oct 25 (today).

停机小段时间以升级数据库。

Youth

Posted 26 Oct 2007 23:48:21 UTC

Excellent answer!

A few comments:

The results from the S4 run is under internal review by the scientists and will be released "soon", I guess.

We intend to publish them before the end of this year.

年底前S4的报告应该能出来。

It took us much longer than expected to develop the post-processing pipeline for S4. It currently looks straightforward to pipe the results of S5R1/S5RI through the same pipeline, which should give a much shorter delay than we had for S4.

S4的后期处理耗费的时间大大超出了预计，但之后的S5R1/S5RI将会快不少。

b) begin to suspect that the theory is wrong because we should have discovered something if it were right.

My very personal opinion on this is that if we don't find what we are looking for I'd rather expect something to be wrong with the search than with Einstein's theory. It might be some technical issue with the detectors or the data analysis, but I guess most likely there would be something wrong with our idea of how a gravitational wave looks like.

即使一直找不到结果，Bernd仍然倾向于怀疑我们对引力波的理解，而不是探测和分析等技术方面的问题，更不是爱因斯坦的理论：）

BM

Youth

We found that we need to split the current S5R3 run at 800 Hz frequency (read more about it in this forum thread). We are currently ~6 days away from the end of the lower half, which means that we are experiencing the usual workunit-cleanup at the end of a run, with the common raise of downlaod traffic during that time. Dial-up users may want to suspend the project for the next days.

我们将以800赫兹为界把当前的S5R3分为两个阶段，目前进行的低频部分只剩下大概6天左右的计算量，这意味着这段时间客户端的网络下载量将会有显著增加。拨号用户可以考虑在接下来的几天暂停本项目。

Youth

将s5r3分成两部分的原因，简单翻译一下：

http://einstein.phys.uwm.edu/for ... p;nowrap=true#80033

The data files currently on Einstein@home of 800Hz and above (h1_0800.0_S5R2* / l1_0800.0_S5R2*) are wrong. While we are generating the correct ones, we stopped generating workunits for 800Hz and above.

当前800赫兹以上任务包指向的数据文件是错误的，我们正在生成正确的数据文件，同时也已停止生成800赫兹以上的任务包。

We intend to let the some thousand WUs that point to the wrong files that are already in the database simply run out. The ones on the boundary (that have 0799.5 files as well as 0800.0) will error out just at the beginning when trying to read the files ("error in SFT sequence"), with no CPU time wasted. The ones above 800Hz that are already in the database will run shorter as the assigned credit would suggest, because the run-time and this the credit was estimated based on correct datafiles. If we would simply cancel these workunits, people that already have completed such a task would get no credit at all for this, so I decided to be rather too generous and let them run.

我们有意让目前指向错误数据文件的几千个任务包正常运行完。正好在边界上的任务包计算时将直接报错，不会浪费计算时间，而在边界以上的任务包其运行时间将比预期的短，因为运行时间和积分都是根据正确的数据文件来估计的。如果我们简单地取消这些任务包，那些已经完成这些任务的用户将得不到积分，所以。。。

The current WU generator will only generate new WUs below 800Hz. There are ~300,000 left to be generated, which should be work for the project for about a week in total. During that time we will generate correct data files and set up a new WU generator for the work of 800Hz and above.

当前的任务包生成程序只会生成800赫兹以下的新任务包，大概还有30万个这样的任务包需要生成，可用来计算一个星期，这段时间我们会生成正确的数据文件，并且构建一个新的用于800赫兹以上频率的任务包生成程序。

So the second half run of S5R3 (currently internally called S5R3b) should start early next week. The new Tasks will run as long as estimated and thus will get the same credit we currently give to the ones with the same base-frequency (but wrong data files).

s5r3的第二阶段即s5r3b将在下周早些时间开始。

Brian, we are considering your proposal to extend the deadline for these new WUs.

BM

Youth

Posted 31 Jan 2008 10:18:23 UTC
We started to send out the first (few hundred) "upper-half" S5R3 tasks for testing. For the curious: The task names end in "S5R3b", and the data files in "S5R3". The Delay Bound ("deadline") has been increased to 18 days.

BM

小批量 S5R3b 阶段的测试任务包应该已经发布出来了，完成期限提升到了18天，使用的数据文件是S5R3的。

Youth

Posted 14 Mar 2008 13:04:38 UTC
Last modified: 14 Mar 2008 13:43:59 UTC
Hi all!

People might remember the S5R1 run that started in 2006 and the problems we had with the fileserver hardware at the end of that year. Though the project experienced downtimes and slow progress, we didn't actually lose any valuable result files - or so we thought. Recently however it turned out that the (canonical) result files that dropped in on the server during three days at the end of 2006 are corrupted beyond repair or lost completely, probably related to a single crash of the fileserver.

不知道大家还是否记得06年底项目的文件服务器出现硬件问题（S5R1阶段），当时我们认为没有丢失任何有价值的计算结果。但我们最近才发现有三天的计算结果还是损坏了，无法修复。

In the near future (1-2 weeks) we'll begin to re-issue the workunits (~150,000) of the lost results with the label S5R3b. They should run with the Apps that we used at the end of S5R1.

在接下来的一两周时间内，我们将重新分发这些相关的任务包，大概15万个吧。

As far as we can foresee this shouldn't affect the current run S5R3b at all, the workunits and tasks should just run side by side as it happened many times before during the transition from one run to the next.

应该不会对当前运行的S5R3b有任何影响，就像之前已进行过多次的阶段切换一样。

BM

Youth

Posted 15 Mar 2008 22:42:15 UTC
Last modified: 15 Mar 2008 22:42:48 UTC
* Post-processing (or final analysis) of the E@H S4 run is finished, but the results are still under internal review.

S4阶段的数据分析已经完成，但仍在进行内部复查。

* Unfortunately the lost S5R1 results span the whole frequency range, no current post-processing of the S5R1 results would work even in a limited frequency band until we have those results (again).

丢失的S5R1计算结果跨越了整个频谱，直到我们重新完成这些任务包的计算，才能开始对S5R1的结果进行分析。

* Yep, there is a result template for S5R3c, but unless we find something going wrong in the current S5R3b I don't think it is of any other use than for internal tests. The next public run will most likely be named S5R4.

如果当前的S5R3b没啥问题，应该就不会有S5R3c了，下一阶段应该是S5R4。

BM

Youth

Posted 20 Mar 2008 12:18:33 UTC
We found an error in the calculation of the computing power needed to re-do the lost tasks. So we'll now do this on our own (LSC) clusters and won't bother Einstein@home with it.

Sorry for the confusion.

(actually another Application with tasks with two more run-times different from S5R3 might have been even more confusing)

BM

对于重新计算那些丢失的计算结果所需的计算力，项目方估算有误，因此现在只需要在项目方自己的集群上进行就可以了。

Youth

The results of the Einstein@Home search on LIGO S4 data have been officially released on the arXiv.org e-print server. This is the first formal scientific publication resulting from the Einstein@Home project. A short public presentation of the results will be given this Sunday at the annual Spring Meeting of the American Physical Society in St. Louis.

S4阶段的研究结果已经正式发布！这也是Einstein@Home项目计算结果首次正式的科学出版。
《The Einstein@Home search for periodic gravitational waves in LIGO S4 data》
http://arxiv.org/abs/0804.1747/

本周末在APS的年度春季会议上将有一个相关的短报告。
http://meetings.aps.org/Meeting/APR08/Event/83502

Youth

http://einstein.phys.uwm.edu//forum_thread.php?id=6703

Posted 4 Jun 2008 13:55:39 UTC

Hi!

The S5R3 Apps have become much faster and more reliable and we even gained some more computing power from more and newer machines in past months. The Workunit Generator where the overall run progress on the server status page is derived from doesn't know about that and its predictions still average over the whole run, so are slightly off. According to internal statistics the last Workunits of S5R3 will be generated in the first days of August.

随着优化程序的发布和新用户的增加，S4R3的进展比最早时要加快了不少。根据目前的估计，S5R3的最后一批任务包将在八月初生成。

Therefore the Einstein@home development team has begun to prepare the next run "S5R4", which will include the remaining data from S5 that wasn't available when we started the previous S5 searches (that much we know yet - the data that will actually be used will be chosen from the whole S5 data in the next few weeks).

因此目前项目组的重心将转移至下了阶段即S5R4的准备工作上来，该阶段主要处理S5的前几个阶段未能处理的数据。

In particular this means that the development of the Einstein@home Applications will now focus on what is needed for S5R4, there will probably be no more new Apps for S5R3.

特别要指出的是，这也意味着在开发方面也将主要是针对S5R4，对于S5R3就应该不会再有新的计算程序了。

Some details for the techs: The "Fstat" engine will stay the same, with all optimizations achieved so far. In the "Hough" code we'll probably switch on the "weights", which might need some adaption of the optimizations done to the "weightless" code. Some more columns with additional (statistical) information about the "candidates" will be added to the result file. This will probably slightly increase the size of the files sent back to the server, and that of the checkpoint files, too. We're discussing measurements to average out the runtime differences visible in the current workunits in the workunits by splitting the sky among them differently from the way we do it now.

技术细节就不翻译了，任务包的分割方式可能会有变更，以减少完成不同任务包所需计算时间的差异。

BM

sakeki

辛苦了，翻译不是件容易的事。

Youth

You can play a game and learn something about gravitational waves at the new website http://www.blackholehunter.org. This project was developed as part of the Royal Society Summer Exhibition 2008.

可用来帮助了解引力波的小游戏：

http://www.blackholehunter.org/

Youth

We are reaching the end of the current analysis run and expect the last workunits of S5R3 to be generated around Aug 1. Participants will probably experience an increase of the downloads necessary for the remaining S5R3 workunits to be processed. Users with low bandwidth will probably want to suspend the project for some days. Users of Beta- and Power-Apps should be aware that they will not get tasks of the upcomig S5R4 run with these S5R3 Apps.

我们正接近当前运行阶段的收尾部分，S5R3的最后一批任务单元应该会在8月1日左右生成。这段时间用户可能会碰到网络下载量增加的情况。非宽带用户也许会希望暂停本项目一段时间。

使用优化程序的用户请注意：您当前使用的S5R3优化程序将导致无法下载到S5R4的任务单元！（说明，到时候将项目目录下的app_info.xml删除再重启boinc即可恢复正常）