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Posts by old_user1

Posts by old_user1

1) Message boards : Cafe CPDN : Blast from the Past (Carl & Tolu @ his wedding) (Message 49267)
Posted 29 May 2014 by old_user1
Post:
Hello all - long time no hear -- I'm in London now at Tolu's wedding and thought I'd share a pic of me with the happy couple.

2) Message boards : Number crunching : Do you know Boincstats is reporting but Free DC is not? (Message 37947)
Posted 4 Sep 2009 by old_user1
Post:
yeah, good job!
3) Message boards : Number crunching : Message no work sent (Message 37912)
Posted 26 Aug 2009 by old_user1
Post:
we will have more \"variety\" of models (i.e. an easier-to-run slab model) in a week or so
4) Message boards : Number crunching : Errors with team description encoding (Message 37865)
Posted 21 Aug 2009 by old_user1
Post:
It also depends on the web browser encoding someone uses, for example some of those links work if I select \"Cyrillic - Windows\" on my Mac Safari browser, but the \"Default\" encoding (unicode I guess) it is gibberish.
5) Message boards : Number crunching : RUNNING 2 HADAM3P WU\'S TOGETHER (Message 37818)
Posted 18 Aug 2009 by old_user1
Post:
I guess it\'s a bottleneck with the memory usage, as these higher res models will have even more memory bandwidth requirements as each timestep goes through the whole big array a few times doing calculations etc.
6) Message boards : Number crunching : Good news for Mac users. HadAM3P Latest News??? (Message 37817)
Posted 18 Aug 2009 by old_user1
Post:
I talked to Tolu - 72,000 timesteps is the end of the run, the model just has an odd feature that it likes to run one more day afterwards.
7) Message boards : Number crunching : Loss of Project Total Credits (Message 37722)
Posted 13 Aug 2009 by old_user1
Post:
the only thing I can think of is somehow when I did the live archive dump the other day, a few old results got lost, causing some of these 1-2% losses. but I needed to bump up the cpdn credits since as Thyme Lawn pointed out we\'re actually \"under-crediting\" when compared to other boinc projects. So a 5% boost on that seemed about right. So you may have noticed a drop of 1-2% (when the database archive happened) followed by a 5% increase. CPDN credits have never been an exact science (sort of like climate modelling ;-)....
8) Message boards : Number crunching : MidHolocene suddenly not for Linux any more? (Message 37721)
Posted 13 Aug 2009 by old_user1
Post:
sorry, the server upgrade has been more traumatic than we all thought; plus it was in the middle of the facebook app being launched so 4-5K new participants were downloading big 120MB hadam3p workunits etc.

I hope we\'ll have new models soon, such as the regional modelling experiment, and the new coupled-model experiment I\'m working on for the IPCC AR5 (which is why I came back to Oxford - not just to wreck everyone\'s credits!)
9) Message boards : Number crunching : Lost credits (Message 37705)
Posted 13 Aug 2009 by old_user1
Post:
according to the boincstats comparison thymelawn pointed me to, it looks like we\'re slightly under the avg for SETI@home, so I will bump it up 5% tonight to bring it more in line with other projects \"credit per second\"
10) Message boards : Number crunching : Lost credits (Message 37702)
Posted 13 Aug 2009 by old_user1
Post:
it\'s probably due to adjustments in the \"model credit rate\" - i.e. some values were changed to more closely reflect credits comparable to SETI@home credits (the \"gold standard\" of credits)
11) Message boards : Number crunching : Average points lost (Message 37693)
Posted 13 Aug 2009 by old_user1
Post:
Jim is right I think, it\'s down a little bit due to the server outage, but upon the next trickle(s) it should bounce back up
12) Message boards : Number crunching : Fatal error (Message 37685)
Posted 12 Aug 2009 by old_user1
Post:
sorry about that, the records are there but \"hidden\" (in the archives) - I\'m rescanning the database for missing anomalies such as this, so it should show up soon.
13) Message boards : Number crunching : Database Outage Starting This Sunday Night (9th August) BST (Message 37652)
Posted 7 Aug 2009 by old_user1
Post:
we've got a new database server thanks to Hiro & Milo, which should greatly help the credits & trickle processing. I am going to shutdown the old database on Sunday night around 5PM BST, and if all goes well we should be back up Monday morning (UK time).
14) Message boards : Cafe CPDN : SETI@home 10th year anniversary! (Message 36996)
Posted 25 May 2009 by old_user1
Post:
In case you missed it this month is the 10th anniversary of SETI@home going live. So "hooray" for the granddaddy of volunteer computing & BOINC! It's done quite a lot of work & made a big impact in 10 years, including of course the "spinoff" BOINC which has a lot of projects doing science including CPDN.

For a little "history" here's a pic on my first visit with the SETI@home gang in December of 2003, just after the climateprediction.net launch ("CPDN classic") in September of '03, when we were first looking to move to the new BOINC (cpdn was one of the first boinc projects). from left to right back row (forgot the guy's name in front!) - Matt Lebofsky, Jeff "Cobblestone" Cobb, unknown student worker?, David Anderson, Dan Wertheimer, & me.

15) Message boards : Cafe CPDN : Happy Birthday, CPDN! (Message 34788)
Posted 27 Aug 2008 by old_user1
Post:
thanks -- \"what a long, strange trip it\'s been!\" :-)

Plus we can\'t forget that without David Anderson working with us in \"the Dungeon of AOPP\" at Oxford for about a month, we could never have integrated CPDN & BOINC! So a lot of thanks go back to him for making it all possible.
16) Message boards : Number crunching : Why is Climate Prediction grabbing all the CPU time (Message 29623)
Posted 19 Jul 2007 by old_user1
Post:
I\'m going to post on the boinc developers list that perhaps projects with long workunits running in tandem with other projects should probably use a simpler \"round-robin\" algorithm for scheduling runs.

17) Message boards : Number crunching : Why is Climate Prediction grabbing all the CPU time (Message 29572)
Posted 16 Jul 2007 by old_user1
Post:
This is not \"BS\" and it\'s not a bug --- there is nothing we on CPDN can do other than make (useless) short workunits that would last a day or so such as other projects. In the \"old days\" of BOINC the scheduler was a simple \"round robin\" which (for example) would run us for an hour, then SETI for an hour, then Einstein for an hour if you had the share settings at 33/33/33. Then things got a bit more \"cleverer\" on BOINC scheduling and we get the problems/notions of short & long term \"debt\" etc.

This was all done for what was hoped to be a useful design & good purpose -- however if you run your PC part-time, and CPDN is <50%, it\'s probably going to be pretty useless and get into a \"long-term debt situation\" where it tries to run CPDN for awhile (otherwise it would take 5 years for the workunit to finish).

For CPDN to have \"day long\" workunits would require uploading/downloading about 50MB per day, and synch up tens of thousands of start dumps etc. It would be a pretty pointless task and may result in a lot of \"garbage\" science since there\'s no telling that sending out 160 year-long workunits to 160 different types of computers would be a meaningful, single 160-year climate model run.

And anyway, I don\'t see why people get offended or mad if CPDN runs two months if it all balances in the end. If you\'re a dedicated BOINC/volunteer computing cruncher, aren\'t you in it for the long haul? So what if it\'s on CPDN for two months then SETI for two months then Einstein for two months etc? It just seems we went from (before the scheduler changes) to people screaming about a lack of work, to now screaming there\'s too much work!


18) Questions and Answers : Unix/Linux : platform \"x86_64-pc-linux-gnu\" not found (Message 29488)
Posted 9 Jul 2007 by old_user1
Post:
we will eventually have \"true\" 64-bit work (I\'m working on a 64-bit model, hadgam1a, right now), but Milo is looking at \"faking\" x86_64 builds so that 64-bit BOINC clients will get some work (it will be 32-bit models but it probably will run quicker on 64-bit machines).
19) Message boards : Number crunching : Error code 22 / Missing Data In Ocean UV Field (Message 29362)
Posted 29 Jun 2007 by old_user1
Post:
It would look like there\'s a bad batch of coupled model param sets; I\'ll tell the Oxford guys to take a look at it.
20) Message boards : Number crunching : No credit since 15/06? (Message 29284)
Posted 26 Jun 2007 by old_user1
Post:
the trickles should be catching up (as well as the credits) -- we were down about 5 days doing database server upgrades and maintenance, and had a little glitch restoring the backups which should be all sorted now.


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