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etienne06
Advanced Cruncher
France
Joined: Jun 11, 2009
Post Count: 56
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sad Sudden slowing of crunching for all projects

Good morning everybody,

I need your help because the crunching has very strongly slowed down on my computer, while I modified no parameter for a few days. It worked perfectly 1 week ago !

This concerns all the project I joined : WCG, poem@home, spinhenge@home, einstein@home, yoyo@home, µfluids, docking@home & rosetta@home.

For example, the cruching begins. The calculation time progresses in a apparently normal way. But in "properties", the "calculation time" is very low (e.g. 1 minute and 40 seconds while the running time is 45 minutes). As a consequence, the progression bar of the calculation does not almost increase. Moreover, when I restart a task, the calculation starts again at zero... crying

I'm about to be late for several WU such as Yoyo, Poem, Docking or µFluids...

Could someone help me please ?

Thanks you in advance,

Have a great day,

Jean-Philippe

PS : If it may be usefull, here are the preferences I use (most of them are initial) :

Processor usage
Suspend work while computer is on battery power?
(matters only for portable computers) yes
Suspend work while computer is in use? no
Suspend GPU work while computer is in use?
Enforced by version 6.7+ yes
'In use' means mouse/keyboard activity in last 15 minutes
Suspend work if no mouse/keyboard activity in last
(Needed to enter low-power mode on some computers) --- minutes
Do work only between the hours of 22:00 and 8:00
Leave applications in memory while suspended?
(suspended applications will consume swap space if 'yes') no
Switch between applications every
(recommended: 60 minutes) 60 minutes
On multiprocessors, use at most 16 processors
On multiprocessors, use at most
Enforced by version 6.1+ 100 % of the processors
Use at most
(Can be used to reduce CPU heat) 90 percent of CPU time
Disk and memory usage
Use at most 2 GB disk space
Leave at least
(Values smaller than 0.001 are ignored) 5 GB disk space free
Use at most 50% of total disk space
Tasks checkpoint to disk at most every 60 seconds
Use at most 50% of page file (swap space)
Use at most 50% of memory when computer is in use
Use at most 70% of memory when computer is not in use
Network usage
Computer is connected to the Internet about every
(Leave blank or 0 if always connected.
BOINC will try to maintain at least this much work.) 0.1 days
Maintain enough work for an additional 0.5 days
Confirm before connecting to Internet?
(matters only if you have a modem, ISDN or VPN connection) yes
Disconnect when done?
(matters only if you have a modem, ISDN or VPN connection) no
Maximum download rate: no limit
Maximum upload rate: no limit
Use network only between the hours of (no restriction)
Skip image file verification?
Check this ONLY if your Internet provider modifies image files (UMTS does this, for example).
Skipping verification reduces the security of BOINC. no

Edit preferences

Separate preferences for home
Processor usage
Suspend work while computer is on battery power?
(matters only for portable computers) yes
Suspend work while computer is in use? no
Suspend GPU work while computer is in use?
Enforced by version 6.7+ yes
'In use' means mouse/keyboard activity in last 15 minutes
Suspend work if no mouse/keyboard activity in last
(Needed to enter low-power mode on some computers) --- minutes
Do work only between the hours of (no restriction)
Leave applications in memory while suspended?
(suspended applications will consume swap space if 'yes') no
Switch between applications every
(recommended: 60 minutes) 60 minutes
On multiprocessors, use at most 16 processors
On multiprocessors, use at most
Enforced by version 6.1+ 100 % of the processors
Use at most
(Can be used to reduce CPU heat) 100 percent of CPU time
Disk and memory usage
Use at most 100 GB disk space
Leave at least
(Values smaller than 0.001 are ignored) 0.001 GB disk space free
Use at most 50% of total disk space
Tasks checkpoint to disk at most every 60 seconds
Use at most 75% of page file (swap space)
Use at most 50% of memory when computer is in use
Use at most 70% of memory when computer is not in use
Network usage
Computer is connected to the Internet about every
(Leave blank or 0 if always connected.
BOINC will try to maintain at least this much work.) 0.1 days
Maintain enough work for an additional 0.25 days
Confirm before connecting to Internet?
(matters only if you have a modem, ISDN or VPN connection) no
Disconnect when done?
(matters only if you have a modem, ISDN or VPN connection) yes
Maximum download rate: no limit
Maximum upload rate: no limit
Use network only between the hours of (no restriction)
Skip image file verification?
Check this ONLY if your Internet provider modifies image files (UMTS does this, for example).
Skipping verification reduces the security of BOINC. no
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[Edit 1 times, last edit by etienne06 at Nov 3, 2010 9:47:13 AM]
[Nov 3, 2010 9:43:19 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Former Member
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Re: Sudden slowing of crunching for all projects

Hello etienne06,
Are you running on Windows 7 Pro? I recently upgraded from Home Premium and discovered that Pro tried to reset my Power Options to slow whenever I fiddled with Power. I wrestled with this problem for a while till I solved it. It kept trying to treat my computer like a laptop that needed to conserve power by slowing down trhe CPU when I left the computer for 20 minutes.

Thanks for all the information you have already posted. Please post the Messages tab after a reboot.

Lawrence
----------------------------------------
[Edit 1 times, last edit by Former Member at Nov 3, 2010 11:40:27 AM]
[Nov 3, 2010 11:19:35 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Former Member
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Re: Sudden slowing of crunching for all projects

There are many reasons for this, but the first thing I'd check is Windows Task Manager (assuming Windows is your OS) to see if there is some process using all your CPU.

Check for errors in the "Messages" tab on your BOINC client.

It would help if you tell you computer specs (CPU, RAM, OS, etc.).

If you have enough RAM, I recommend setting the "Leave applications in memory while suspended?" option to Yes.
[Nov 3, 2010 11:28:03 AM]   Link   Report threatening or abusive post: please login first  Go to top 
etienne06
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France
Joined: Jun 11, 2009
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Re: Sudden slowing of crunching for all projects

Thank you Lawrence and Bono for your answers.

- My OS is not Windows 7 Pro. I only use XP
- I have not checked the Task Manager. I'll do it this evening. But what is the "messages tab" in the BOINC client please ? I can't post it...
[Nov 3, 2010 12:50:24 PM]   Link   Report threatening or abusive post: please login first  Go to top 
sk..
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Re: Sudden slowing of crunching for all projects

In Boinc Manager Advanced View there is a Tab called Messages.
[Nov 3, 2010 1:17:56 PM]   Link   Report threatening or abusive post: please login first  Go to top 
GTCola2010
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Re: Sudden slowing of crunching for all projects

Etienne, I'm glad you posted this question.

I've had a similar problem these last five days. In my case, the elapsed time is accurate (5 hours elapsed time = 5 hours real time) but the time to completion increases (say, from 10 hours to 20 hours) and the progress will be 0.1% even after 5,10,20 hours. When this happens (say, the job starts in morning and then I check in the evening) I abort and go to the next job. But this has happened three or four times in a row with HCC and CCW.

My OS is Ubuntu (dual booted with Win 7) with a Celeron 900 on a laptop. I also have Ubuntu (dual boot with XP) on a netbook that is running fine.

Any ideas? Thanks
[Nov 9, 2010 4:35:32 PM]   Link   Report threatening or abusive post: please login first  Go to top 
Former Member
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Re: Sudden slowing of crunching for all projects

Treat this as in addition to any suggestions above, not replace or usurp them, it could still be other hardware issues, the power setting as suggested, or even the BIOS setting for power management.

Be aware that the BOINC Client is notorious for poor tracking where the time for completion is concerned. The reasons are in fact fair enough - long story - but the reality is still there.

With any BOINC Project always track your duration by looking at percentage completed and the time taken to date, and extrapolate to 100%. For example if the time taken to date shows 4 hours, and completion percentage so far is 40%, you have 6 hours to go. This method is usually on the money quickly after starting the WU, but certainly ok after around 30% has been crunched.

Completly ignore the value for "Time to Completion", always use the elapsed time and percentage so far to estimate the time left to crunch. You will find wierd things happening to the "time to completion" figure, dont make decisions on that, and certainly dont abort based on that number, extrapolate "elapsed time to date", then make a decision.

Regards
Zy
[Nov 11, 2010 8:46:06 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Sekerob
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Re: Sudden slowing of crunching for all projects

Zy,

Some of the WCG sciences show a percent that is hardwired to the maximum ''allowed'' run time. CEP2 is a good sample that no matter how fast, the % relates to the 12 hour cut-off time, so you can see 40% one moment and completed the next time you look.

HCMD2 and several other sciences with highly non-deterministic calculations that have short and long dockings/attempts/seeds/loops mixed suffer this faith, making caching work a real roller coaster, particularly if set multi-day combined with the Duration Correction Factor algorithm **. Run all 8 researches on 1 client at WCG and one quickly finds out that anything cached over 1-2 days can cause head spinning.

** There is a private custom build somewhere of 6.10.58 that maintains DCF per-science app. Would love to put my paws on a copy of that one.

On topic, if BOINC makes only makes little progress look in the task manager with admin rights so everything can be seen, then sort by CPU% use. Last week I could not grasp why only 50% and less efficiency was achieved. Looked in the SM and found the mail app (evolution) had launched itself somehow and was eating 100% as a zombied process. The OS was swapping processes around, so it affected all 4 cores. Killed it and things returned to normal.
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[Nov 11, 2010 9:13:12 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Former Member
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Re: Sudden slowing of crunching for all projects

Useful pointers - Thank You much appreciated biggrin

The variations in BOINC Projects never cease to provide roller coaster rides, and engender those spontanious headaches beloved of the logical mind rofl laughing

Regards
Zy
[Nov 11, 2010 9:59:58 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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