I may have spoke to soon about my CPU temp. I looked into things further and found my CPU fan runing at a lower speed than it should be. I'll have to check it out tomorrow.

According to my Asus Probe utility:
Current CPU temp: 57C/134F
Current MoBo temp: 37C/98F
CPU fan speed: 4141-4166
Right now my ASUS bios is set to run the fan at 11/16 ratio. I'll keep a watch on the temp and see if I need to turn up the fan. Thanks for the heads-up, Marc.

Wow. Mine is about 8 degrees hotter with setiathome 4.05.

Processing a work unit went from 3 hours 20 minutes for two (Hyperthreading) to 4 hours.

I got to thinking about this and while I haven't really noticed any temperature increases (I'll have to check when my CPDN gets pre-empted and SETI starts again), it does make sense to me how two processes that use 100% of the CPU could have different temperature results. The heat is generated by electrons whizzing around the various pathways in the chip. If one process uses more areas of the chip to do its thing, more heat will be generated.

I could see how a program that contains an infinite loop of adding and subtracting 1 from a value would generate less heat than a program that did more complicated mathematics utilizing more areas of the chip. Another thing that could cause a difference is how much interaction one program has with others areas such as RAM and Disks vs another.

Anyway, with my system, anything that runs the CPU at 100% seems to run it around the same temperature.

Mark H.

> Well, if you are running a process just under 100 percent and the room ambient
> air temperature is constant, your CPU/computer should stabilize to a certain
> temperature. If you quit the processes you are running and run different one's
> (like 4.05 instead of 4.03 Seti) your CPU/computer temperature should be the
> same (as long as the room ambient temperature hasn't changed) and the
> processes run at the same percentile. From what I've seen, 40.3 and 4.05 run
> at the same percentile.
>
> I'm no expert on this, so maybe someone else can help, but I think I'm
> correct.

Well again one the point is missing. Different programs all running at
100% does not necessarely run at same temperature. Threads do not
represents all of what your CPU is doing.

RISK II 100% 68°C
SETI CALSSIC 100% 72°C
SETI BOINC 4.03 100% 62-64°C
SETI BOINC 4.05 100% 70-72°C
TRAIN SIM 100% 82°C
etc.

I was just finished with me last SETI 4.03 WU and temperature was 62°C
BOINC started the next one using SETI 4.05 and temperature rised up to
68 and increasing up to 72°C for the complete process. Now tell me what
changed in between these two WU ? Ambiant temperature was the same, My
cooling system didn't change, etc.

OK so we all now that WU takes longer to process with 4.05 and From what
I can see from here it also uses more CPU ressources and this resulting
in higher CPU temperature.

Does the 4.05 version is actually doing deeper math analysis ? I don't
know. Doest it have some debugging code that slows the process but also
makes it harder on the CPU ? I don't know. Did I've just happen to download
some funny WU that no others have had so far ? I don't know.

I am just relating facts that I can see here on my screen and that is
my CPU is working harder since it runs SETI 4.05

-.-. --.- -.. -..- . - --... ...-- .-.-. -.-

Well, if you are running a process just under 100 percent and the room ambient air temperature is constant, your CPU/computer should stabilize to a certain temperature. If you quit the processes you are running and run different one's (like 4.05 instead of 4.03 Seti) your CPU/computer temperature should be the same (as long as the room ambient temperature hasn't changed) and the processes run at the same percentile. From what I've seen, 40.3 and 4.05 run at the same percentile.

I'm no expert on this, so maybe someone else can help, but I think I'm correct.

> My WUs take about 30-40% longger to finish too. Unfortunately, I didn't
> monitor temps closely on my BOINC boxes. I doubt that the client is more
> "efficient" if it takes longger to finish a WU. :(
>
>

Quite likely the 4.05 client is performing more calculations that the 4.03 client. Back in the day on Classic Seti, the 3.x clients took about 75% longer to complete WU's than the 2.x clients - specifically because 3.x performed more science.


<a>

> I'm now using 4.05 and my machine crunches at 97 - 98 percent (winXP with the
> task manager active). My CPU temperature is the same as with 4.03. I can't see
> how your temperature would increase 4 degrees C unless you were crunching a
> less than 97 - 98 percent CPU usage on 4.03.
>
> CPU activity can't go above 100%, so you were either running under 97 -100
> percent under 4.03 or you need to check your computer cooling.
>
> Any other opinions?

Thanks but I know that it can't go above 100% But it does not everything.
Threads are just one aspect of CPU usage. You can run program X at 100%
and having temperature higher or lower then program Z also using 100%
threads. Here SETI 4.03 was 99% and 4.05 is also 99%. To prove that try
different game for example. All the games I play, from RISK II to Unreal
tournement they all uses 99% but temperature varies from +/- 10°C
My computer cooling is working very well. I have cleaned it (laptop) last
week.

I have proved on this thread that the non linear processing time were also non linear
as for processing power usage. I will monitor the next units very closely.

-.-. --.- -.. -..- . - --... ...-- .-.-. -.-

My WUs take about 30-40% longger to finish too. Unfortunately, I didn't monitor temps closely on my BOINC boxes. I doubt that the client is more "efficient" if it takes longger to finish a WU. :(

I'm now using 4.05 and my machine crunches at 97 - 98 percent (winXP with the task manager active). My CPU temperature is the same as with 4.03. I can't see how your temperature would increase 4 degrees C unless you were crunching a less than 97 - 98 percent CPU usage on 4.03.

CPU activity can't go above 100%, so you were either running under 97 -100 percent under 4.03 or you need to check your computer cooling.

Any other opinions?

I have just finished my first WU using SETI 4.05.
Not only it took 40% longer to process but the CPU ran
4°C warmer then before.

That is a fact. I have proved before on another thread
for those who remember, that I know my machine and I
monitor it's temperature very precisely.

It proves that there is defenitely something wrong with
that version. It seem that the CPU is actually wasting his
ressources on something that has nothing to do with "pure
SETI processing" like searching for
Gaussians, spike, triplets, etc.

Logicaly, an increase of CPU temperature means more
processing works, and therefore slower processing times.

Something is wrong here.

Marc