CPU is getting hot: can I pause rendering proces?

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CPU is getting hot: can I pause rendering proces?

Johan Jonker
I use openscad since a few month and I did not buy a laptop that was prepared for that.
The CPU has to work quite hard for the rendering proces.
I often get the warning that I have heating problems and that I have to turn off the laptop immediately.

Problem is that the rendering sometimes takes quite long and cannot be paused, I think. Or is there a trick to do that?

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Re: CPU is getting hot: can I pause rendering proces?

Johan Jonker
Also the viewing after F5 takes a lot of CPU capacity.
Is it possible to stop the viewing process?
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Re: CPU is getting hot: can I pause rendering proces?

fred_dot_u
You should consider that a typical computer is designed to remove heat in such a manner as to never have the type of message you are seeing unless there is something wrong.

If this is an older laptop, you could have too much dust on the cooling fins within the laptop. With the power turned off, use an air stream from a can of air or air compressor and apply it to the vents on the underside and/or back of your laptop. Use very short bursts of air, as you do not want to force the internal fan to spin at high speed, which would happen with long bursts of air. If you perform this task in a well-lighted area, you will see dust from the exit vents.

If this does not cause your machine to run cooler, it is possible that the heat sink thermal paste has dried out, especially if this is an older laptop. That is more complicated to fix, as it is necessary to disassemble entirely the laptop. The thermal transfer assembly must be removed from the processor, all surfaces cleaned and thermal transfer paste re-applied, then re-assembled.

Perhaps you will get lucky and find it needs only to have the dust removed.
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Re: CPU is getting hot: can I pause rendering proces?

jon_bondy
I was always taught that vacuum (sucking) was better than blowing,
because the latter can force things to get jammed into place, while
vacuum pulls things out.  I may be wrong.

If you can identify where the warm air is exiting from your laptop,
another possibility is to position a fairly strong muffin fan right next
to the laptop, so that it pulls more air through the cooling system.  
Not elegant or convenient, but it might get you through this particular
incident.

Jon


On 5/21/2016 8:03 AM, fred_dot_u wrote:

> You should consider that a typical computer is designed to remove heat in
> such a manner as to never have the type of message you are seeing unless
> there is something wrong.
>
> If this is an older laptop, you could have too much dust on the cooling fins
> within the laptop. With the power turned off, use an air stream from a can
> of air or air compressor and apply it to the vents on the underside and/or
> back of your laptop. Use very short bursts of air, as you do not want to
> force the internal fan to spin at high speed, which would happen with long
> bursts of air. If you perform this task in a well-lighted area, you will see
> dust from the exit vents.
>
> If this does not cause your machine to run cooler, it is possible that the
> heat sink thermal paste has dried out, especially if this is an older
> laptop. That is more complicated to fix, as it is necessary to disassemble
> entirely the laptop. The thermal transfer assembly must be removed from the
> processor, all surfaces cleaned and thermal transfer paste re-applied, then
> re-assembled.
>
> Perhaps you will get lucky and find it needs only to have the dust removed.
>


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Re: CPU is getting hot: can I pause rendering proces?

fred_dot_u
For the cooling system in a laptop, the airflow is limited to the fans and fins and it's more difficult to vacuum dust than it is to direct an air stream to dislodge the particles. For the fun of it, on a throw-away laptop, I used high pressure air for a long period of time and destroyed the fan. It sounded like a turbine engine until it didn't. I probably overheated any bearings or contact surfaces, but it was a throw-away, so no real harm done.

In a desktop computer, the air from a compressor hose or can is dispersed more widely, but still dislodges the dust. Using a vacuum has a higher chance to suck or break a component.

Occasionally, I've had to re-seat memory chips after blowing dust from a desktop computer.
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Re: CPU is getting hot: can I pause rendering proces?

fred_dot_u
In reply to this post by jon_bondy
Another note, if the problem is dust or dried thermal transfer paste, an additional external fan will not resolve the overheating. There is insufficient heat transfer with the current air flow, but it's not likely related to insufficient airflow.
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Re: CPU is getting hot: can I pause rendering proces?

Peter Falke
Maybe you can under-clock your processor.

2016-05-21 14:21 GMT+02:00 fred_dot_u <[hidden email]>:
Another note, if the problem is dust or dried thermal transfer paste, an
additional external fan will not resolve the overheating. There is
insufficient heat transfer with the current air flow, but it's not likely
related to insufficient airflow.



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Re: CPU is getting hot: can I pause rendering proces?

MichaelAtOz
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In reply to this post by Johan Jonker
Johan Jonker wrote
Problem is that the rendering sometimes takes quite long and cannot be paused, I think. Or is there a trick to do that?

Also the viewing after F5 takes a lot of CPU capacity.
Is it possible to stop the viewing process?
For F6 render, there is a small close icon (X in a circle) at the end of the progress bar after the n/1000, however, it is only tested between CGAL calls, if CGAL is in a lengthy operation it can take a long time. Unfortunately one of the longest is the final union of all objects. So cancelling can be a problem.

I tend to cancel the process. As OpenSCAD auto-saves you can get any edits back if needed.

F5 will use a lot of cpu if you use render(), minkowski(), resize() and I think offset() as these use CGAL. There is no cancel function for F5.

You say "viewing after F5", if that means F5 is finished, but viewing such as moving the object, is slow, then you need a new PC, or break-up your model as it is usually a very complex model causing this.

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or if I've done something stupid...
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Re: CPU is getting hot: can I pause rendering proces?

fukanchik
to pause: killall -STOP openscad
to resume: killall -CONT openscad

On Sat, May 21, 2016 at 7:12 PM, MichaelAtOz <[hidden email]> wrote:

> Johan Jonker wrote
>> Problem is that the rendering sometimes takes quite long and cannot be
>> paused, I think. Or is there a trick to do that?
>>
>> Also the viewing after F5 takes a lot of CPU capacity.
>> Is it possible to stop the viewing process?
>
> For F6 render, there is a small close icon (X in a circle) at the end of the
> progress bar after the n/1000, however, it is only tested between CGAL
> calls, if CGAL is in a lengthy operation it can take a long time.
> Unfortunately one of the longest is the final union of all objects. So
> cancelling can be a problem.
>
> I tend to cancel the process. As OpenSCAD auto-saves you can get any edits
> back if needed.
>
> F5 will use a lot of cpu if you use render(), minkowski(), resize() and I
> think offset() as these use CGAL. There is no cancel function for F5.
>
> You say "viewing after F5", if that means F5 is finished, but viewing such
> as moving the object, is slow, then you need a new PC, or break-up your
> model as it is usually a very complex model causing this.
>
>
>
>
>
> -----
> Admin - PM me if you need anything, or if I've done something stupid...
>
> Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
>
> The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
> --
> View this message in context: http://forum.openscad.org/CPU-is-getting-hot-can-I-pause-rendering-proces-tp17384p17397.html
> Sent from the OpenSCAD mailing list archive at Nabble.com.
>
> _______________________________________________
> OpenSCAD mailing list
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Re: CPU is getting hot: can I pause rendering proces?

Johan Jonker
Hello everyone, thanks for reacting.

I was really considering to buy a new laptop. But min is only 2 years old.
So I did first some cleaning (dust removal from the ventilation opening).
It seems to help. The laptop sound less noisy when calculating.
I also be more patient. Not watching yuotube moving while waiting to render. I saw that that the temperature is going up when I do that.

I had not noticed the subtile x in the right corner: thanks for that.
I will try the kill operation.
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Re: CPU is getting hot: can I pause rendering proces?

Johan Jonker
This post was updated on .
To pause and resume of kill processes, this is a nice tool: https://technet.microsoft.com/en-us/sysinternals/bb896653.aspx