CPU Load question

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Tim Deschamps, Jr.

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Message 1200153 - Posted: 26 Feb 2012, 21:21:52 UTC

I was wondering if this was a normal load pattern when running SETI@home tasks on my CPU:



The load will go from 80-90% to 5% and back up again over and over. I've got an i5-2400 and a 550ti.

I'm also only running at 40-50% cpu usage because my temp (according to realtemp) spikes into the 60's sometimes. I'm not sure how accurate that is though because it will go from 50 to 60 back to 50 in a second, based on the CPU load. Any help is greatly appreciated.
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Message 1200155 - Posted: 26 Feb 2012, 21:29:45 UTC

I can but assume that "50%" is a time averaged level rather than a continuous level.

Both my current crunchers are running at 100%, and are essentially "flat lined" at that figure.
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Message 1200159 - Posted: 26 Feb 2012, 21:38:45 UTC

ya totally normal, if you only put 40%-50% it s normal you get that kind of pattern.

me i have 100% and it s linear. 100% always 100% of the time
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Message 1200162 - Posted: 26 Feb 2012, 21:40:31 UTC - in response to Message 1200159.  

ya totally normal, if you only put 40%-50% it s normal you get that kind of pattern.

me i have 100% and it s linear. 100% always 100% of the time


Haha ok thanks for the reply. I would go 100% but I'm scared with the temps I'm getting at just 50%. I should probably look at how accurate realtemp is though because it fluctuates +/- 10 a lot.
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Message 1200164 - Posted: 26 Feb 2012, 21:43:28 UTC

screenshot of mine :


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Message 1200171 - Posted: 26 Feb 2012, 22:23:33 UTC

That is normal unless you are specifying affinity when you start BOINC to keep it on whichever cores you want.

For your a 4 core CPU you probably want to let windows spread the load across all of the cores, but if you do not. Then you can start BOINC from a command line like this:
start /affinity hex value boinc.exe

I made a little table of the values since it seems backwards to me.
HEX	BINARY		CPU Cores
1	0001		0
2	0010		1
3	0011		0,1
4	0100		2
5	0101		0,2
6	0110		1,2
7	0111		0,1,2
8	1000		3
9	1001		0,3
A	1010		1,3
B	1011		0,1,3
C	1100		2,3
D	1101		0,2,3
E	1110		1,2,3
F	1111		0,1,2,3

HEX	BINARY		CPU Cores
10	00010000	4
20	00100000	5
30	00110000	4,5
40	01000000	6
50	01010000	4,6
60	01100000	5,6
70	01110000	4,5,6
80	10000000	7
90	10010000	4,7
A0	10100000	5,7
B0	10110000	4,5,7
C0	11000000	7,7
D0	11010000	4,6,7
E0	11100000	5,6,7
F0	11110000	4,5,6,7


For a 4 core system to just use cores 0 & 2:
start /affinity 5 boinc.exe
For a 4 core system to just use cores 1 & 3:
start /affinity A boinc.exe
For a 8 core system to just use cores 0, 2, 4, & 6:
start /affinity 55 boinc.exe
For a 8 core system to just use cores 1, 3, 5, & 7:
start /affinity AA boinc.exe

While you could use F (on a 4 core system) or FF (on an 8 core system). That would be a bit silly since you would be telling it to let it use all cores which is the system default.
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Message 1200172 - Posted: 26 Feb 2012, 22:28:10 UTC - in response to Message 1200171.  

That is normal unless you are specifying affinity when you start BOINC to keep it on whichever cores you want.

For your a 4 core CPU you probably want to let windows spread the load across all of the cores, but if you do not. Then you can start BOINC from a command line like this:
start /affinity hex value boinc.exe

...

While you could use F (on a 4 core system) or FF (on an 8 core system). That would be a bit silly since you would be telling it to let it use all cores which is the system default.


I don't really understand what you mean by this. I have it on whatever the default is right now, which it looks like is using all 4 cores equally. The main thing I'm concerned about is my temp, which realtemp shows spiking close to 70 when I'm running at 90%+ cpu usage.
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Message 1200173 - Posted: 26 Feb 2012, 22:36:39 UTC - in response to Message 1200172.  
Last modified: 26 Feb 2012, 22:38:24 UTC

The main thing I'm concerned about is my temp, which realtemp shows spiking close to 70 when I'm running at 90%+ cpu usage.


ya me too i dont like to see it go to 70-75C

i was always opening the outside door lol trying to lower ambient temp of the room :S

now i keep the heat lower, way lower if none, and i use a big fan 18'' near my PC.

trying to keep between 56c and 69c

edit:
before summer , i ll need to check about water cooling things
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Message 1200187 - Posted: 26 Feb 2012, 23:42:51 UTC - in response to Message 1200171.  
Last modified: 26 Feb 2012, 23:43:30 UTC

HAL9000 wrote:
That is normal unless you are specifying affinity when you start BOINC to keep it on whichever cores you want.

For your a 4 core CPU you probably want to let windows spread the load across all of the cores, but if you do not. Then you can start BOINC from a command line like this:
start /affinity hex value boinc.exe

I made a little table of the values since it seems backwards to me.
HEX	BINARY		CPU Cores
1	0001		0
2	0010		1
3	0011		0,1
4	0100		2
5	0101		0,2
6	0110		1,2
7	0111		0,1,2
8	1000		3
9	1001		0,3
A	1010		1,3
B	1011		0,1,3
C	1100		2,3
D	1101		0,2,3
E	1110		1,2,3
F	1111		0,1,2,3

HEX	BINARY		CPU Cores
10	00010000	4
20	00100000	5
30	00110000	4,5
40	01000000	6
50	01010000	4,6
60	01100000	5,6
70	01110000	4,5,6
80	10000000	7
90	10010000	4,7
A0	10100000	5,7
B0	10110000	4,5,7
C0	11000000	7,7
D0	11010000	4,6,7
E0	11100000	5,6,7
F0	11110000	4,5,6,7


For a 4 core system to just use cores 0 & 2:
start /affinity 5 boinc.exe
For a 4 core system to just use cores 1 & 3:
start /affinity A boinc.exe
For a 8 core system to just use cores 0, 2, 4, & 6:
start /affinity 55 boinc.exe
For a 8 core system to just use cores 1, 3, 5, & 7:
start /affinity AA boinc.exe

While you could use F (on a 4 core system) or FF (on an 8 core system). That would be a bit silly since you would be telling it to let it use all cores which is the system default.

How can I integrate this into a normal BOINC 6.12.34 installation?

Anthony.
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Message 1200205 - Posted: 27 Feb 2012, 0:41:26 UTC - in response to Message 1200187.  

HAL9000 wrote:
That is normal unless you are specifying affinity when you start BOINC to keep it on whichever cores you want.

For your a 4 core CPU you probably want to let windows spread the load across all of the cores, but if you do not. Then you can start BOINC from a command line like this:
start /affinity hex value boinc.exe

I made a little table of the values since it seems backwards to me.
HEX	BINARY		CPU Cores
1	0001		0
2	0010		1
3	0011		0,1
4	0100		2
5	0101		0,2
6	0110		1,2
7	0111		0,1,2
8	1000		3
9	1001		0,3
A	1010		1,3
B	1011		0,1,3
C	1100		2,3
D	1101		0,2,3
E	1110		1,2,3
F	1111		0,1,2,3

HEX	BINARY		CPU Cores
10	00010000	4
20	00100000	5
30	00110000	4,5
40	01000000	6
50	01010000	4,6
60	01100000	5,6
70	01110000	4,5,6
80	10000000	7
90	10010000	4,7
A0	10100000	5,7
B0	10110000	4,5,7
C0	11000000	7,7
D0	11010000	4,6,7
E0	11100000	5,6,7
F0	11110000	4,5,6,7


For a 4 core system to just use cores 0 & 2:
start /affinity 5 boinc.exe
For a 4 core system to just use cores 1 & 3:
start /affinity A boinc.exe
For a 8 core system to just use cores 0, 2, 4, & 6:
start /affinity 55 boinc.exe
For a 8 core system to just use cores 1, 3, 5, & 7:
start /affinity AA boinc.exe

While you could use F (on a 4 core system) or FF (on an 8 core system). That would be a bit silly since you would be telling it to let it use all cores which is the system default.

How can I integrate this into a normal BOINC 6.12.34 installation?

Anthony.

I start my machine by loading things up in a bat file. I am on my old single core notebook at the moment so it just looks like this:
_B_Start.bat
D:
cd boinc
rd notices /s /q
D:\BOINC\boinc.exe --skip_cpu_benchmarks --detach
start D:\BOINC\boincmgr.exe /s


However a quick change to this would do the trick on a multi-core machine.
D:
cd boinc
rd notices /s /q
start /affinity AA D:\BOINC\boinc.exe --skip_cpu_benchmarks --detach
start D:\BOINC\boincmgr.exe /s


If you are starting BOINC by loading boincmgr.exe I would expect you could just change your starting shortcut or registry entry to:
start /affinity AA D:\BOINC\boincmgr.exe /s

Keeping whatever other syntax you are currently using. If a registry entry is used to start up BOINC for you then you can make the changes on a machine and export the entry to a .reg file. Making the installation on other machines easier for you.
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Message 1200210 - Posted: 27 Feb 2012, 0:54:34 UTC - in response to Message 1200205.  

I'm probably only going to change it on my i7 2600K where I use 7 out of 8 virtual cores. I'll be using 'hex FE' to keep core 0 free. I don't know if I'll use it on my C2D E6750, or on my laptop's C2D T8300.

Thanks for the info HAL9000.

Anthony.
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Message 1200225 - Posted: 27 Feb 2012, 2:03:27 UTC - in response to Message 1200205.  

HAL9000 wrote:
However a quick change to this would do the trick on a multi-core machine.

If you are starting BOINC by loading boincmgr.exe I would expect you could just change your starting shortcut or registry entry to:
start /affinity AA D:\BOINC\boincmgr.exe /s

Keeping whatever other syntax you are currently using. If a registry entry is used to start up BOINC for you then you can make the changes on a machine and export the entry to a .reg file. Making the installation on other machines easier for you.

This didn't work, not by changing the registry and reboot, and if I put the line in a shortcut it gives me the error message 'The name 'start' in the target box is not valid. Make sure... etc'.

I will have to try by writing a batch file as 'start' seems to be a 'console command'.
Like this:
start /affinity FE "C:Program Files\BOINC\boinc.exe" --skip_cpu_benchmarks --detach
start "C:Program Files\BOINC\boincmgr.exe" /a /s

And by starting it via the registry I don't even need the last line as I'm using BoincTasks as my BOINC manager.

Anthony.
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Message 1200689 - Posted: 28 Feb 2012, 15:24:59 UTC

I've tried using a batch file to use the console 'start' command, but it doesn't work. It doesn't even work when I open a command prompt and then use the 'start' command.

Anthony.
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Message 1200692 - Posted: 28 Feb 2012, 15:40:36 UTC - in response to Message 1200689.  

I've tried using a batch file to use the console 'start' command, but it doesn't work. It doesn't even work when I open a command prompt and then use the 'start' command.

Anthony.

If start isn't working from the command prompt then something funny is going on. Maybe it only works with admin rights that isn't being used?
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Message 1200697 - Posted: 28 Feb 2012, 16:06:19 UTC - in response to Message 1200692.  

I started a command promt as administrator and that worked. But how can I start a batch file as administrator (although I'm an administrator).

Anthony.
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Message 1200700 - Posted: 28 Feb 2012, 16:14:58 UTC

If you want temperature controlled CPU usage I strongly recommend TThrottle. The setting 'use at most only X% of CPU time' has a workfetch bug and does strange things to the CPU usage. If set to less than 100 boinc keeps starting and stopping the apps.
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Message 1200703 - Posted: 28 Feb 2012, 16:20:10 UTC - in response to Message 1200700.  

I'm using TThrottle.
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Message 1200704 - Posted: 28 Feb 2012, 16:24:09 UTC - in response to Message 1200703.  

I'm using TThrottle.


Sorry Anthony, that was directed at the person who started the thread :D

If Tim is worried about his CPU getting too hot, TThrottle is a far better option than the BOINC 'use at most x CPU' setting.
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Message 1200782 - Posted: 29 Feb 2012, 1:11:04 UTC - in response to Message 1200697.  

I started a command promt as administrator and that worked. But how can I start a batch file as administrator (although I'm an administrator).

Anthony.

If you are an admin I'm not sure why it wouldn't work. If you are using a shortcut to launch the /bat file short cuts do have an option on the Shortcut tab > Advanced > Run as Administrator.

If you run the .bat from a command prompt does it work?
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Message 1200787 - Posted: 29 Feb 2012, 1:28:09 UTC - in response to Message 1200782.  

I have it working now. You really need to change the directory to the boinc folder.
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Message boards : Number crunching : CPU Load question


 
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