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Stefan Lohaza
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Re: Checkpoints

Thanks everybody for your priceless hints. I'll try to accomodate most of them and I'll continue to participate in clean energy project to such extent as it suits my particular situation. Thanks again,

Stefan Lohaza
[Dec 7, 2011 5:51:35 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Checkpoints

yes, for technical/algorithmic reasons the checkpoints are unfortunately rather far spread.
So expect to see tasks completed take a hit next week; Microsoft "Patch Tuesday" includes a number of patches that require system restart - and as they address serious exploits, I'd call them important.

http://technet.microsoft.com/en-us/security/bulletin/ms11-dec

(Under Bulletin Information, expand Executive Summaries and Affected Software then correlate by bulletin #s to see how they affect your O/S specifically...but you'll have to restart. Is a critical requiring restart for everybody.)

Me, I use the WCG/BOINC client to suspend and force a check for updates manually on Tuesday afternoon/evening/night in order to prevent automatic updates from booting my systems when I'm not observing. A pain, but I have had inconsistent - to include less than ideal - results when updates attempted to run when CEP2 was using (depending upon system) 90% to 100% CPU and Windows applied updates and then rebooted.
[Dec 11, 2011 3:01:50 PM]   Link   Report threatening or abusive post: please login first  Go to top 
Former Member
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Re: Checkpoints

yes, for technical/algorithmic reasons the checkpoints are unfortunately rather far spread.
So expect to see tasks completed take a hit next week; Microsoft "Patch Tuesday" includes a number of patches that require system restart - and as they address serious exploits, I'd call them important.

http://technet.microsoft.com/en-us/security/bulletin/ms11-dec

(Under Bulletin Information, expand Executive Summaries and Affected Software then correlate by bulletin #s to see how they affect your O/S specifically...but you'll have to restart. Is a critical requiring restart for everybody.)

Me, I use the WCG/BOINC client to suspend and force a check for updates manually on Tuesday afternoon/evening/night in order to prevent automatic updates from booting my systems when I'm not observing. A pain, but I have had inconsistent - to include less than ideal - results when updates attempted to run when CEP2 was using (depending upon system) 90% to 100% CPU and Windows applied updates and then rebooted.

No patch of MS is important enough to do a boot immediately upon application. If your system was clean before, it will be still in a few hours or days [the AV did not stop, WD did not stop, the FW did not stop to function], similar to ibsteve2u, I've been telling off my virtual soap box, plan the boot [set update to manual apply], as what I described in the "I Confez" thread. Set all unstarted CEP2 tasks to suspend, set the checkpoint save [write to disk] to 60 seconds ** and let the running CEP2 task(s) finish and replaced by those that do quickies (Clean water is excellent for that). Did the very thing when applying the last Linux 3.0.0-14.16 kernel replacement. Obviously, if the sole crunching is with CEP2, that's not an immediate option on a multicore device. Mind you, it's the 3rd checkpoint that takes the long hours, past that, toward the last few of 16, the checkpoints are generally not far apart and can be well monitored with BOINCTasks or activating the <checkpoint_debug> log flag to choose the best point to stop the BOINC service *** [ideally so the client gets full attention to close running tasks, particular the heavy CEP2], then do the Windows boot, which I've on last one had to cycle twice for a total of 10 minutes, on Windows that is. Linux just zooms through, back up in a minute.

** For those only running CEP2, the WtD setting is ineffective
*** On Windows 7/8 this can be easily done as admin from the Tasks Manager, Service tab.

Edit: Of course, how I do it and feeling save enough to wait with booting may not be how it feels to you. If MS thinks it's so overly important, why wait for patch Tuesday? In Linux world, they get notified for update in Ubuntu within 24 hours through the Update Manager. Then I got KSplice running to get kernel patches inserted in a bootless environment. Just crunching on and BOINC set to pause if the non-BOINC CPU load gets high (The infamous low default of 25% now upped to 50%).

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[Edit 1 times, last edit by Former Member at Dec 11, 2011 3:28:47 PM]
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Former Member
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Re: Checkpoints

No patch of MS is important enough to do a boot immediately upon application.--//--
I would only agree if you are not using that computer to do shopping on the web, as one of the patches appears to address the BEAST - or "Browser Exploit Against SSL/TLS" - exploit. And I think those who read this article might tend to agree with me: http://www.theregister.co.uk/2011/09/19/beast_exploits_paypal_ssl/

(Edit: Oh, and you're also unconcerned about the Duqu worm, which appears to related to the Stuxnet worm: http://www.computerworld.com/s/article/922181..._the_big_deal_about_Duqu_ )
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[Edit 1 times, last edit by Former Member at Dec 11, 2011 3:52:44 PM]
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Former Member
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Re: Checkpoints

IE webbrowser users could be. Do AV/WD/FW not shield from these exploits? Anyone shopping at untrusted sites?... I'm highly reluctant to reveal any banking info to any good Joe? Yes, by all means, as I said in the first line of the Edited in para, others may feel different. And of course thanks for the MS Patch highlight link. There's a reason these days why I do this sparse internet shopping off the Linux machine.

We have a Patch Tuesday thread floating in the Chat Room. Maybe port it there and not continue to take this thread further off the topic, my fault to extend that path here.

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[Edit 1 times, last edit by Former Member at Dec 11, 2011 4:11:59 PM]
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Former Member
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Re: Checkpoints

We have a Patch Tuesday thread floating in the Chat Room. Maybe port it there and not continue to take this thread further off the topic, my fault to extend that path here.--//--
As the way CEP2 checkpoints is different from all other science applications, and as that fact makes any requirement to restart a CEP2 PC carry more of a penalty as well as potential hazards that I have personally experienced, and as I know that the vast majority of Windows users leave updates set to automatic, it was and remains my opinion that informing CEP2 crunchers specifically was of importance - and as this thread is about checkpointing in CEP2 and in fact is entitled "Re: Checkpoints", it seemed like the logical location.

I wouldn't wager a cobblestone on the likelihood that CEP2 crunchers check the chat room for information; it is my thinking that they would check the CEP2 forum. I personally found the chat room by accident one day in consequence of a web search (specifically a thread denying global warming, of all things); although I cannot consider my experience to be universal, one thing I do know: There is no stickie in the CEP2 forum that says "Check the chat room for information that may affect your your ability to or method of running CEP2." Your post seems to suggest that there should be?

Edit: The goal here is to avoid surprising the CEP2 cruncher with unexpected "complications". That was my intent, at least; I will think twice in the future.
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[Edit 1 times, last edit by Former Member at Dec 11, 2011 4:56:52 PM]
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Former Member
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CEP2: Checkpoints

It was my mistake to continue this topic on of patch day [which still if they are so very critical, why not send out instantaneously? Is everyone so trained that we're waiting with our internet shopping till MS feels it ready to insert the fixes?]

You did right bringing it up in the first place, so gonna leave it at that.

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[Dec 11, 2011 5:48:31 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: CEP2: Checkpoints

Thanks for the heads up everybody!
Best wishes from
Your Harvard CEP team
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buissonp
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Re: CEP2: Checkpoints

Yesterday I stop CEP2 for the same raison. I turn off my computer after 5 hours and at the restart I have only 37 minutes ...
[Dec 31, 2011 11:39:30 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: CEP2: Checkpoints

Dear buissonp,
we are sorry to hear that you decided to leave CEP2. But if you really have to shut your computer down regularly (rather than putting it into sleep or hibernation mode) you may indeed be better off crunching a different WCG project.
Best wishes
Your Harvard CEP team
[Jan 1, 2012 7:03:55 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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