Posts by old_user36084

1) Message boards : Number crunching : Speed variation between models (Message 8495) Posted 2 Feb 2005 by old_user36084 Post: On my two HT CPUs slot 0 is always faster than slot 1, on my limited comparison of running my first 6 models.
2) Message boards : Cafe CPDN : tom toles cartoon (Message 8494) Posted 2 Feb 2005 by old_user36084 Post: lol
3) Message boards : Number crunching : Data still there, BOINC cannot use it (Message 8466) Posted 2 Feb 2005 by old_user36084 Post: If you've backed up the BOINC directory before the crash, you can restore it by directly replacing the complete BOINC directory with backup. No backup then I believe you can't restore to a previous state of the project. I backup my BOINC directory daily using a automated method which stops BOINC then copies all of the BOINC directory before restarting BOINC crunching. This requires more disk space but you could get it to compress the backup. This has allowed me restore to a previous state of BOINC when it has fatally crashed.
4) Message boards : Cafe CPDN : Four times as much energy is used to produce a PC as it uses during its whole lifetime (Message 8436) Posted 2 Feb 2005 by old_user36084 Post: Agree. I've been doing the weekly "big shop" with reuseable carrier bags now for about year. You just have to remember to take shopping list plus carrier bags with you. Possible some money as well!
5) Message boards : Number crunching : Corrupt data files being generated (Message 8435) Posted 2 Feb 2005 by old_user36084 Post: If Martin Sykes, creator of CPview2, is checking this forum please could I get a reply about the muddled data sets being shown by the program. This has now started to occur in my other models on a different PC. Perhaps it is a known bug with CPview2, but as we can't access the other forum I can't find info. Your help will be much appreciated.
6) Message boards : Cafe CPDN : Four times as much energy is used to produce a PC as it uses during its whole lifetime (Message 8433) Posted 2 Feb 2005 by old_user36084 Post: I'm unsure on these bio-degradable carrier bag schemes. Firstly, what do you think happens when these items "quickly" degrade and disappear? They are releasing methane, one of the most powerful greenhouse gases, refer to <a href="http://news.bbc.co.uk/1/hi/magazine/3116318.stm">article</a>. Hence, bio-degradable bags are "good" for inducing climate change. Just because you can see rubbish everywhere doesn't mean it is changing the environment as much as those substances we can't perceive with human senses i.e. seeing, smelling and feeling. I say reuse, recycle and introduce penalties on wastefulness; or incentives to be kind to the environment. For this to occur EDUCATION is the key.
7) Message boards : Cafe CPDN : Improving forum (Message 8418) Posted 2 Feb 2005 by old_user36084 Post: It would be nice if you could display on one webpage all the threads that you've subscribed to. This allowing you to unsubscribe or just find things again quickly that interested you like a favorities. I like the feature of seeing all the posts you've done :) Perhaps, you can already do this but I've not noticed it. Any other suggestions?
8) Message boards : Cafe CPDN : Posted twice - sorry (Message 8417) Posted 2 Feb 2005 by old_user36084 Post:
9) Message boards : Number crunching : Corrupt data files being generated (Message 8416) Posted 2 Feb 2005 by old_user36084 Post: For brief PhD info check out my <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/view_profile.php?userid=36084">profile</a>.
10) Message boards : Cafe CPDN : Four times as much energy is used to produce a PC as it uses during its whole lifetime (Message 8415) Posted 2 Feb 2005 by old_user36084 Post: You've hit the nail on the head. I was thinking 3 yrs is a short time for the average lifespan of a PC. But then it got me thinking I've not used as my day to day PC one that is older than 5 yrs. I'm upgrading to a "better" and "faster" system every three years. Ok, my old PCs don't just get put in the bin, they are often handed down to family and friends who infrequently use computers. Or they end up in my attic, like my 20 yr old <a href="http://www.old-computers.com/museum/computer.asp?st=1&c=500">Apricot Xi</a>, which still works! Education in reuse and recycle is essential.
11) Message boards : Cafe CPDN : Four times as much energy is used to produce a PC as it uses during its whole lifetime (Message 8390) Posted 1 Feb 2005 by old_user36084 Post: The question about leaving computers on for 24/7 answered in <a href="http://www.climateprediction.net/info/part_faq.php#q3.1">FAQ</a> could be backed up with an article titled "How PC is your PC?" in the IEEE Spectrum, Jan 2005. In this article, it compares a PC (Pentium III and 17-inch CRT) to a refrigerator with the following statistics quoted: <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/2-picture3.gif"> This includes the total energy that goes into a PC from manufacturing to use. It is said that the production cost of 6400 MJ is almost twice that estimated in a 1998 study. These glorified typewriters are damaging our sustainable environment. At least we can put them to some practical use and obtain maximum "usefulness" out of them by running distributed computing problems like CP. IEEE Spectrum reference to Eric William, Journal of Environmental Science and Technology, 15 November 2004
12) Message boards : Number crunching : Credit score calculation (Message 8355) Posted 1 Feb 2005 by old_user36084 Post: Thanks for that. I thought I must have mis-calculated and I probably made the most silly mistake, lol. Then I tried to correct it by dividing the timesteps by the credit ... oh dear ... when I should have been doing credits per trickle.
13) Questions and Answers : Windows : system freezes while running BOINC 4.13 (Message 8352) Posted 1 Feb 2005 by old_user36084 Post: I don't know that error message from your debugger but you could try installing <a href="http://boinc.berkeley.edu/download.php">BOINC v4.19</a>. Don't uninstall v4.13, just install v4.19 in the same directory as v4.13 and it'll upgrade itself.
14) Message boards : Number crunching : Credit score calculation (Message 8350) Posted 1 Feb 2005 by old_user36084 Post: I thought I would calculate my credit per trickle and I get 114.28... for this <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/show_host_detail.php?hostid=86671">computer</a>. This 2.6 GHz P4 HT computer is crunching its first 2 models with a total credit of 6994.30 to date. It is half way through both models i.e. in phase 2. total trickles = ((1stPhase = 259248 trickles) + (2ndPhase = 140426 trickles)) x 2 models total trickles for computer = 799348
15) Message boards : Number crunching : Credit score calculation (Message 8347) Posted 1 Feb 2005 by old_user36084 Post: Why do benchmarking then? AFAIK benchmarking doesn't determine your CPU work load because you set that yourself in the general preferences via no. of CPUs to use and amount of processing usage. Moreover, I don't think it confirms your computer suitability for the CPDN when such low spec computers are reported to be crunching these huge WUs and taking months. Just image the high probability of failure with time. So why benchmark?
16) Message boards : Number crunching : Credit score calculation (Message 8345) Posted 1 Feb 2005 by old_user36084 Post: I take it that boinc calculates your credit per trickle by using the benchmark results. If your benchmark result is higher does that mean you get more credit for each trickle completed? I'm a whore for stats, <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/forum_thread.php?id=14">reference</a>.
17) Message boards : Number crunching : Corrupt data files being generated (Message 8329) Posted 1 Feb 2005 by old_user36084 Post: I've updated the plots in my previous posts with scales, and showing the same time period, May/Summer 1813, which was randomly chosen. When I look at the .pg data files from my other running models they appear to make sense. In this model the .pe data files are ok, but the .pg as shown are definitely not realisable, with temperatures shown as practical absolute zero, can't even do that in me 4 K cryostat! I think that this may be a bug in CPview2 in reading the data set files. I believe the first picture (Daily Minimum Surface Temp) is actual showing Total Precipitation Rate, the numbers would then make sense along with the global location of the max and mins. Whereas the second plot is actual U Component of Wind After Timestep and not Maximum Surface Temp. Likewise with the third plot which I have deduced to be actual showing V Component of Wind After Timestep and not the CPview2 stated Total Precipitation Rate. Perhaps the model is running fine and CPView2 is just displaying the data in a muddled fashion. I can zip these data set files and post them to anyone with a good eye at reading the data set files and see if they are ok. Ian PS Avoiding his PhD; much more exciting looking at CP plots of my running models.
18) Message boards : Number crunching : Corrupt data files being generated (Message 8227) Posted 31 Jan 2005 by old_user36084 Post: I've found the near surface temperature plots and they appear ok, here is an example. <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/2-picture1.jpg"> <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/2-picture2.jpg"> Perhaps the data set is fine and it's me getting anxious about wasting CPU cycles if it all goes tits up. It's me first model! Even so I'm still bothered about the mis-calculation of the CPU time during the transition from phase 1 to 2. Is this a known bug? Should I be concerned?
19) Message boards : Number crunching : Corrupt data files being generated (Message 8161) Posted 30 Jan 2005 by old_user36084 Post: I must add that this CPU time error occurred during the transition from phase 1 to 2; is this known to cause errors in cpu time calculation? I've just discovered how to insert images into threads, so here are the CPview2 shots of what I think is muddled data: <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/1-picture1.jpg"> <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/1-picture2.jpg"> <img src="http://mysite.wanadoo-members.co.uk/terahertzgap/images/1-picture3.jpg"> Do you think this data set looks corrupted? Goto this <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/forum_thread.php?id=140">thread</a> for the usage of html tags and embedded images in threads.
20) Message boards : Number crunching : Corrupt data files being generated (Message 8135) Posted 30 Jan 2005 by old_user36084 Post: Iâ€™m running BOINC_cli as a service so the only way I know of looking at the data files is using CPview2. I look at only the backup data set files and avoid the current files encase of conflict. When I look at the *.pg files for one of my models it appears to have got the data in a muddle. The data titled Daily Minimum Surface (1.5m) Temperature shows precipitation rate data plus the Wind After Timestep contains lots of ticks across the screen. This could be due to a bug in CPview2 and not that the data sets are corrupt. Furthermore the program has got in a muddle with calculating the cpu time see <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/trickle.php?resultid=487942">results</a>. For the last tickle it calculated a CPU time of approximately 3 hours, but it actual took 10 hours like the previous tickles. The other model that is running on this dual system appears to be ok. I have restored this boinc with a backup, replacing the complete boinc program file as discussed in <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/forum_thread.php?id=1672">thread</a>. Also Iâ€™ve upgraded from 4.13 to 4.19. Perhaps I should try restoring boinc to a previous backup and see if the problem occurs again.

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