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Old 12-21-2022, 07:48 AM   #16
fengli
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Originally Posted by Comfy.n View Post
seems unusual, indeed. see edit

I just did a couple of epub to pdf conversions, while monitoring the main calibre program CPU usage, and the highest it went up to was 13%.

(whereas Qt Web Engine processes combined will go up to more than 50%, as usual since the PDF rendering engine changed... Sometimes I prefer Calibre Portable 3.48, for converting to PDF, for other reasons)

edit: I wasn't using Windows built-in Task Manager to measure Calibre CPU usage. Just now I tried it, and it went up to 60% for a while, during converting, so I guess what you see isn't unusual
It seems that the blue screen analysis (debug) often shows the impact caused by Qt Web, you are too good
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Old 12-21-2022, 07:49 AM   #17
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Odd. on various computers I've used, I've had multiple processes pushing all the cores to 99-100% CPU usage on a sustained basis and no blue screens (current system has 12 cores). The last time I saw blue screens with high CPU load was a system that had a low end CPU cooler installed that was incapable of handling the thermal load and a CPU that lacked thermal throttling.
I'm using an AMD cpu that may have self-protection when the CPU is running at 100% high?
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Old 12-21-2022, 07:53 AM   #18
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Originally Posted by Comfy.n View Post
seems unusual, indeed. see edit

I just did a couple of epub to pdf conversions, while monitoring the main calibre program CPU usage, and the highest it went up to was 13%.

(whereas Qt Web Engine processes combined will go up to more than 50%, as usual since the PDF rendering engine changed... Sometimes I prefer Calibre Portable 3.48, for converting to PDF, for other reasons)

edit: I wasn't using Windows built-in Task Manager to measure Calibre CPU usage. Just now I tried it, and it went up to 60% for a while, during converting, so I guess what you see isn't unusual
It is possible that the problem you mentioned, the rendering engine has changed, which may bring about a sudden high CPU ratio, which is enough to make the computer blue screen crash
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Old 12-21-2022, 12:22 PM   #19
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No you have a hardware problem. The first place to start is to monitor your cpu temps while doing a conversion to see if it is going high--over 95c--if high temps then clean and use new heat compound for your cpu cooler. if it is not a cpu temp problem then the next will be reseating and moving around your memory simms.

In my experience as a Field engineer a over heating cpu or a memory that needs reseating or a bad memory sim is the top possibles for causing your problem.

My bet is on the memory.

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It is possible that the problem you mentioned, the rendering engine has changed, which may bring about a sudden high CPU ratio, which is enough to make the computer blue screen crash
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Old 12-21-2022, 02:25 PM   #20
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Lint builds up. Check all Fin and Grills and fan blades.
Fan bearings go bad (slowly). Watch the fan, it should not jerk or look slow under Fluorescent light (strobe effect). With the system OFF, spin the fan, it should keep turning a turn or 2 after a flick.

I don't know about modern AMD, but my old K6 ran real hot (compared to a P II), fan fail was common.
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Old 12-21-2022, 11:14 PM   #21
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Quote:
Originally Posted by fengli View Post
I'm using an AMD cpu that may have self-protection when the CPU is running at 100% high?
Thermal throttling has been a feature of both AMD and Intel CPUs since the mid-2000's if I am remembering correctly (Intel introduced thermal throttling a few years earlier). When I ran into the issue was a few years before that running an AMD Athlon CPU purchased in early 2000. There were a few videos of CPUs catching fire when the heatsink was removed.

Thermal throttling is not about the CPU usage but rather the temperature. High CPU usage tends to increase the temperature but removing the heat sink, having a fan failure or any other issue with the cooling system is a much faster way to reaching the temperature at which throttling will kick in. One friend of mine who owns several cats found cat hairs do a great job of causing ventilation issues.
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Old 12-22-2022, 07:02 AM   #22
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Goldendict, which is also a QT-based program, goes crazy up into 100% CPU usage when doing full-text searches.

Nevertheless, i haven't yet seen a BSOD caused by that... which IMO points to something wrong hardware-wise in your system as Leseratte said in the first reply, or maybe driver related.

I often see Kovid suggesting this workaround for some e-book Viewer issues, but I'm not sure if that could help in this case.
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