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LHC@Home第四份统计报告!

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发表于 2005-9-9 23:19:34 | 显示全部楼层 |阅读模式
4th STATUS REPORT FOR THE USERS OF LHC@home
Septemer 8, 2005

Production continues of a second batch of 250,000 million-turn jobs. The first such batch was successfully completed on August 26th after running for about 2 months. Each batch is actually being submitted in 8-10 sub-batches of around 25,000 jobs and each job creates approximately 5 Results due to the BOINC redundancy factors chosen. Each million-turn WU takes about 5 hours on a typical modern CPU, but we use more generous time estimates to accommodate the inaccurate benchmark in the boinc client. A small percentage of WU's terminate very rapidly in the case where the particles are lost due to beam instability - which is very interesting for us if not for the donor's credit - sorry!

An analysis is performed after each sub-batch. It is important to the project that all jobs in a sub-batch are completed before each analysis can proceed - for this reason we use fairly aggressive deadline settings and adjust them depending on observed turnaround. Deadlines are currently around 5 days. As experienced crunchers have noted, this should discourage "hoarding" of WU's in large caches, a practice which adversely affects our completion times.

The actual process of job submission is driven by a very small number of machine physicists, and irregularities are to be expected. Yes, sometimes we run out of work and sometimes we have too much. Please be tolerant, and please try and support other BOINC projects when we are out of work. We may be analysing (or we may be tired or on holiday).

The work being done is a serious contribution to the commissioning of the LHC accelerator, and the amount of work in prospect will increase as commissioning proceeds. This is because the beam simulations initially use "nominal" machine parameters, but as real machine components are installed the true measured parameters are introduced and the results become more critical. Currently we are using "Version 6.4" of the LHC machine configuration: the updates to each later machine version will require a new series of runs. Version 6.5 is expected shortly.

We removed the freeze on new donors about 2 months ago and are receiving around 3000 new active subscribers per month. We are pretty happy with this situation and have no server or bandwidth problems for now.

Thanks once again to all our supporting crunchers and to all the experienced people out there who answer many (if not all) of the questions posed by newcomers.

LHC@Home Team

翻译见2楼!
 楼主| 发表于 2005-9-9 23:19:58 | 显示全部楼层
献给LHC@Home用户的第四份统计报告
2005年9月8日

第二批25万个任务的生产仍在继续。第一批在运行了大约2个月以后于8月26日被成功地完成。各批实际上递交8-10个子组(约25,000个任务/组),并且由于BOINC选择的冗余参数每个工作返回大约5个结果。每个工作平均大约需5个cpu小时,但我们使用比较宽松的耗时预测,以适应boinc客户端的不精确的基准速度。小部分任务由于射线不稳定而丢失粒子时会直接结束运算 - 如果不是志愿者的零积分问题,我们还不会发现呢 - 抱歉!

在各子组完成以后就进行分析。就项目自身而言最重要的是,在每次分析进行前,子组所有的任务必需全部完成 - 因此我们使用相当短的期限设置,并根据返回情况适时调整他们。当前期限大约是5天。因为老志愿者提醒到,这应该可以劝阻在缓存里"囤积"大量的任务,这样的做法有害地影响我们的完成时间。

任务的提交过程,实际上是由可怜的几个机械物理学家来完成,并且工作时间很无规律。是的,我们有时无任务,而有时又有太多。请原谅我们,并且当我们无工作时请尝试参加其它BOINC项目。我们可能在分析结果(或是我们太疲乏了,或是在放假)。

完成任务是对LHC加速器早日完工非常重要的贡献, 并且随着建造的进行任务数量也会越来越多。这是因为最初地射线模仿使用"假设的"机器参数,但是当真正的机器组件被安装好后,将使用真正的测量到的参数,结果就变得更重要了。当前我们使用"6.4版"的LHC机器配置:以后每次更新机器版本,都将要求进行一系列新的运算。6.5版很快会发布。

大约2个月前我们解除了注册限制,现在每月有大约3000个新用户。对此我们相当高兴,而且现在服务器或带宽都没有问题。

再次感谢所有支持我们的志愿者和那些回答由新人提出的许多问题的“老人” 。

LHC@Home团队

翻译 BY VMZY
2005年9月9日23:45

[ Last edited by vmzy on 2005-9-9 at 23:47 ]
发表于 2005-9-9 23:30:48 | 显示全部楼层
呵呵,vmzy辛苦了:)
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发表于 2005-9-9 23:39:52 | 显示全部楼层
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