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Profile mo.v
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Message 29225 - Posted: 12 Jun 2007, 16:34:25 UTC
Last modified: 12 Jun 2007, 18:23:10 UTC

On behalf of the cpdn research team in Oxford, Milo has launched a special Results website

http://results.cpdn.org/

It makes the results of our completed 160-year climate models freely available to climate researchers worldwide. There are departments of Climatology and Atmospheric Physics in countries and universities where computing resources are not available to produce the sort of enormous data bank, or ensemble of models, that the Climate Prediction team now has. This initiative therefore makes our results available to many more researchers than was previously the case, without our efforts needing to be duplicated. More than 11000 of our BBC and cpdn models are now available for researchers to download from the website.

I am sure all our members will welcome such free and open exchange of research data. In many scientific fields, both data and publications are increasingly being made freely available by their creators.

Selected models could also potentially be used as a teaching resource to demonstrate aspects of climatology or this type of numerical modelling.

Milo demonstrated the new website at the recent symposium about climate change at St John\'s College, Oxford.

It is suggested that we should not all register on this new website, which is primarily meant for climate researchers who may wish to select and download models. We may, of course, all view it at the above link.

There is now an extra section on the cpdn independent forum underneath the Climate section. It\'s for news and discussion about the Results website.

It goes without saying that this initiative has only been possible thanks to the efforts of all our volunteer BBC and cpdn crunchers.

Please note that the cpdn Results website is not a boinc project. All the models/workunits there have already been crunched. This new facility is a research tool for scientists. And the launch of this facility doesn\'t mean our model crunching for cpdn is over! As long as climate models are available for download from cpdn, it means that the research team needs more.
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Message 29898 - Posted: 8 Aug 2007, 20:54:46 UTC
Last modified: 26 Sep 2007, 22:52:14 UTC

Crandles has described here the science behind the different types of model available at cpdn, with links to many of the most relevant climate science websites.

Brief technical summaries of the types of model can be read here. An explanation of how the server will apply your model preferences (in your account on the project preferences page) has been added.

Members registered on the independent forum (get there through my signature) can receive email notification of new posts in the News thread by clicking \'Watch this topic for replies\' at the bottom left of the page. (Plus, of course, any other threads you choose on that forum.)
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Message 31271 - Posted: 4 Nov 2007, 12:31:33 UTC
Last modified: 17 Dec 2007, 19:28:36 UTC


On the independent forum the way to report anything offensive is to send a private message to one of the moderators.

On the boinc forums (CPDN, beta, SAP and BBC) inappropriate posts can be reported by clicking the X under the post. In the private messaging facility we can specify members we don\'t want to receive messages from. Inappropriate PMs can be reported by sending a PM to a moderator.
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Message 31278 - Posted: 5 Nov 2007, 10:35:20 UTC

REMINDER

On all the ClimatePrediction forums the private messaging facility should only be used for personal and private messages.

It can be used for communication between existing team members because they know each other, but should not be used for team announcements to non-members, or for team recruitment. The place for posts about team recruitment and announcements to the public is the forum Cafe.
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Message 32995 - Posted: 16 Mar 2008, 13:58:50 UTC
Last modified: 13 Aug 2009, 14:46:55 UTC

The server status of ClimatePrediction projects can be checked here:

CPDN
http://climateapps2.oucs.ox.ac.uk/cpdnboinc/server_status.php
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Message 33883 - Posted: 19 May 2008, 18:01:25 UTC
Last modified: 26 Nov 2008, 0:58:43 UTC

CPDN

Since the CPDN server BOINC software upgrade, there are some changes on the Task details web pages of our models.

* On the pages of successfully completed models we now see \'Validate state - Workunit error - check skipped\'. This looks like an error but isn\'t. It\'s there because of the way many other BOINC projects validate completed tasks. It doesn\'t apply to tasks from any ClimatePrediction project, so please ignore this line.

* On the same Task details pages there\'s a line called stderr out. When a task has finished computation, whether crashed or completed, clicking the + shows some details from the model\'s run log. Sometimes more details, sometimes fewer.

Here\'s one of mine so you can see these features.
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Message 34020 - Posted: 6 Jun 2008, 13:02:51 UTC
Last modified: 19 Jun 2008, 0:14:14 UTC

The BOINC FAQs are now available in German, Dutch and Spanish as well as English and are beginning to appear in Czech.

This documentation was Jorden\'s initiative and Neil Munday kindly hosts it on his server.

Jorden still needs two French translators for the FAQs. They should be native French speakers and have a good understanding of BOINC and its terminology. Details about how to volunteer are posted on the boinc_dev forum.

Reminder: Do not stop a slab HADSM model or exit from BOINC after a phase change from phase 1 > 2 or 2 > 3 until the model has passed at least one save point after the phase change. Otherwise the model may go back to the beginning of the phase.
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Message 34343 - Posted: 22 Jul 2008, 9:36:51 UTC
Last modified: 22 Jul 2008, 9:37:32 UTC

New CPDN Moderators

Ananas and Gerald Davison have been appointed moderators here and on the CPDN independent forum.
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Message 34345 - Posted: 22 Jul 2008, 16:27:40 UTC

Thyme Lawn has updated the CPDN moderator list here.
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Message 34888 - Posted: 4 Sep 2008, 2:46:32 UTC
Last modified: 20 Aug 2009, 22:09:52 UTC

Information about BOINC6

Further information about BOINC6 can be found in the BOINC FAQs. The most useful FAQ items for BOINC6 are The Big BOINC Answer thread, and here (to read after installation) and here. There is also a preview of the BOINC6 protected/service installation process here. If you wish to install in screensaver mode ie not as a service, the preview is also useful.

Many of these FAQs are also available in German, Dutch, Czech, French and Spanish by clicking on the flags at the top of the page.

Please note that BOINC6 installs itself in two folders in two different locations, one for BOINC itself and the other for Data, which includes all project and model/task data. The Big BOINC Answer Thread lists the default BOINC6 locations for Windows, Linux and Mac computers. When we install BOINC6 it is a good idea to write down on paper the complete path to where the BOINC Data folder is located. It will then be easy to find it again. When we upgrade from one version of BOINC6 to a newer version of BOINC6 it will be advisable to use the same location again.

Windows may hide the BOINC Data folder by default, so you may need to set the flag in the Windows options to show all folders/files before looking for the folder.

BOINC6 Backups

Before upgrading to BOINC6, make a backup of the complete contents of your Boinc folder! Here are the READMEs about backups.

In BOINC6 the BOINC program folder content becomes static; we do not need to back it up. Backing up the BOINC Data folder in full keeps our models backed up. (Members who have Mac with a later version of BOINC5 should already be doing this.)

The backup methods described in the READMEs also work for backing up the BOINC Data folder. A Data folder backup must be restored to the Data folder in the same location as before.

If you make a backup when you have BOINC5 and need to restore a crashed model after upgrading to BOINC6, please ask for advice on the forum. To avoid this situation it is a good idea to back up the BOINC6 Data folder soon after your BOINC upgrade.
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Message 34973 - Posted: 13 Sep 2008, 0:24:38 UTC

BOINC6 versions

Many computers with Windows and BOINC versions 6.2.14 and 6.2.16 are crashing models immediately after download with error code -185 and the message \'Can\'t get shared memory segment name: shmget() failed\'. This problem is happening with HADAM, HADSM and HADCM models (and also with tasks from some other BOINC projects). You can see the code and messages for finished models on their web page; click + beside \'stderr out\' to see these extra details.

Check your version of BOINC by right-clicking on the BOINC icon in the notification area, bottom right of the screen, and selecting About Boinc Manager.

Members with these earlier BOINC6 versions should upgrade as soon as possible to v. 6.2.18 which contains a fix. Download it from here. Please see previous posts in this news thread for links to information about BOINC6.

BOINC5 versions are not affected by this problem.
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Message 35223 - Posted: 11 Oct 2008, 13:23:27 UTC

Norton/Symantec upgrade to Norton Anti-Virus 2009 with Sonar feature

This upgrade could kill your current climate models; if your models cannot be restored from a backup they will be lost. So before members with Norton AV download this free upgrade they should back up the complete contents of the BOINC5 BOINC folder or the BOINC6 BOINC Data folder. After the upgrade you will need to add the BOINC or BOINC Data folder to your NAV exclusion list again. Members with NAV should read this and this thread. If you need advice please post in one of those threads.

This problem may also affect members of other BOINC projects.
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Message 35364 - Posted: 24 Oct 2008, 13:38:43 UTC
Last modified: 24 Oct 2008, 13:45:59 UTC

HADCM v.6.02 on CPDN main project

We have discovered a bug in these models which were available for Windows, Linux and Mac between 29 Sep and 22 Oct 2008. They have now been replaced by HADCM 6.04 in which the defect appears to be fixed. Version 6.02 will produce valid data for research on the Geoengineering Experiment, but these models\' files will become abnormally large, up to 6.5GB by the time they complete. There is a risk that they will use all the disk space allocated to BOINC and crash.

Please see this thread for details about how you can identify and fix the problem. Apologies to members for the inconvenience caused.
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Message 35621 - Posted: 1 Dec 2008, 18:18:10 UTC
Last modified: 1 Dec 2008, 18:21:20 UTC

Some links of interest:

Hiro Yamazaki of the CPDN research team has given details in the Climate Science section of the website about the Millennium Experiment.

Real Climate recently posted a comprehensive FAQ on climate models (of all types, not only the Met Office Unified Model that CPDN uses).

In March 2007 the organisation Sense about Science held a very informative symposium about climate change at St John\'s College, Oxford. Milo demonstrated CPDN models there. The talks have been made available for download here. (The files are rather large!)
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Message 35888 - Posted: 10 Jan 2009, 20:18:51 UTC

Updated post

CPDN Model Graphics

Some members running CPDN version 6.** models with BOINC 5.*.* cannot see their model graphics. The Show Graphics button is greyed out some or all of the time. The graphics of CPDN 6.** models were intended to be fully backwards-compatible with BOINC 5 but this was not 100% successful.

If you have this problem with BOINC v.5 you could exit from BOINC then restart it. If that does not reenable the graphics please upgrade to BOINC 6.2.19. See the post three above this about BOINC versions.

Anyone with BOINC 6.2.19 or later who experiences this problem with CPDN 6.** model versions is asked to report it on the CPDN forum here.

REMINDER

It is important to look at models\' graphics occasionally, especially HADSM and HADSM MH models. These two model types

* should not be stopped by suspending the model or exiting from BOINC while they are doing their end-of-phase post-processing in early December at the end of each 15-year phase. Please wait until after at least one extra 3-day checkpoint after post-processing before stopping these models.

* in some cases develop into slow- or fast-processing \'iceworlds\'. This abnormality produces monochrome graphics. Please report iceworlds on the forum for a definite diagnosis before aborting them. Forum reports allow the moderators to send private messages warning other members with models from the same workunit. To receive email notification of such private messages you must enable it in the Community Preferences of your account.

After opening the model graphics click Z then 8 on the keyboard to see extra details including the countdown to checkpoints. For example, E shows sulphur emissions and V has been added for vorticity.
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Message 35980 - Posted: 20 Jan 2009, 22:56:00 UTC
Last modified: 1 Mar 2009, 19:40:04 UTC

Reminder: If you have BOINC v.6 installed as a service ie in protected mode (which is the default installation mode), in order to exit completely from BOINC to make a backup or turn the computer off you need to do two things:
* BOINC Manager > Advanced view > Advanced > Shut down connected client. This shuts down the service.
* File > Exit to close down BOINC Manager.

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Message 36049 - Posted: 28 Jan 2009, 20:14:49 UTC
Last modified: 28 Jan 2009, 20:15:38 UTC

Dave Frame and his colleagues at CPDN have published a paper titled \'The climateprediction.net BBC climate change experiment: design of the coupled model ensemble\' in the Philosophical Transactions of the Royal Society which is in London.

http://journals.royalsociety.org/content/w214633520523134/fulltext.pdf

These 160- and 80-year models were run initially by BBC participants and later also by CPDN members. Other types of CPDN model are also discussed in the paper. Most of the authors of the paper can be seen here. The last reference in the paper shows more research by the CPDN team in progress.

The paper is a 16-page pdf download, not too large for most of us.

A very small number of brave and loyal BBC members are still uploading trickles from their Climate Change Experiment models more than two years after starting them. The top BBC project participants can be seen here.
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Message 36059 - Posted: 31 Jan 2009, 12:03:41 UTC
Last modified: 31 Jan 2009, 12:07:31 UTC

CPDN main project and Beta

Update of announcement made on 24 October.

HADCM 6.02 (from CPDN) and HADRM 6.00 spinup models (from Beta) accumulate their .nc files and do not regularly delete them as they should. These models\' folders become larger and larger as they progress. So large that some of these models will crash because they use up all the disk space allocated to BOINC. There are detailed instructions for manually deleting the .nc files here. In that thread please also read Richard Haselgrove\'s post as he points out the safest and easiest time to delete the files.

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Message 36426 - Posted: 20 Mar 2009, 13:23:16 UTC

CPDN all projects

We have now completed over 30,000 HadAM and 21,000 HadSMMH models. Our crunching statistics can be seen on the CPDN home page here.

At the beginning of March we reached the impressive total of 300,000 completed HadSM models. These models have been used for several research projects. Ben Sanderson, who has now left Oxford, analysed them using neural nets. Dan Rowlands, who can be seen here on the research team\'s new web page, is building on Ben\'s work by using emulators (techniques to perform regression) to fit a surface to the slab model response in parameter space.

Dan says \'While Ben used neural nets, I am using a technique called Random Forests as an emulator, which benefits from requiring very little tuning to get good results. It also provides a measure of uncertainty in each prediction. I am using the slab models as a test bed for this technique, and so have been sending out some verification runs on CPDN - i.e. train the emulator on this part of the current CPDN ensemble, then use the emulator to predict the output for new parameter combinations then distribute these models on CPDN and compare the actual model response to what was predicted. I distributed around 10,000 models (each with an initial condition ensemble of 4 members) based on a continuous sampling of parameter space (rather than the discrete sampling used in the original ensemble), and am currently analysing the results. I plan to compare different emulation techniques, namely neural nets v random forest v gaussian process emulators and highlight the strengths and weaknesses of each.\'

Random Forests

Reminder: You may need to edit your model selection in the climateprediction section of account to tell the server whether you want to run the new short HadAM3P models. If you run too many of these side-by-side on a multi-core computer they will slow each other down, so let them run alongside other model types.
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Message 36551 - Posted: 29 Mar 2009, 17:35:29 UTC
Last modified: 20 Aug 2009, 21:25:57 UTC

At the time of this post, hadam3p (version 6.06) is NOT compatible with CPUs/processors without SSE2 capabilities. That means HADAM3P is NOT compatible with


  • Pentium 3, Pentium 3 based Celerons and Xeons, and older Intel processors, and
  • Athlon XP/MP, Athlon XP based Semprons/Durons, and older AMD processors.


See this post for more information.

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