calibre6.10：CPU usage is particularly high when converting

[fengli]

epub to PDF, the cpu ratio is particularly large, easy to system blue screen, please help to see, thank you!

[Leseratte_10]

What's the issue? When a program is working on a CPU-intensive task like converting a file, having a high CPU usage is expected.

If your system bluescreens just because an application uses a bit of CPU that's an issue with your system.

[Quoth]

That's not high anyway.

I've had stuff (not Calibre) put all 4 cores to nearly 100% and no crash.

[theducks]

Originally Posted by fengli

epub to PDF, the cpu ratio is particularly large, easy to system blue screen, please help to see, thank you!
Attachment 198526

What is choking your conversion? The conversion would get done a lot faster if you found (and fixed) the choke point.
More RAM? SSD? Less aggressive A/V setting (there is no need to check a book every step of the way. It SHOULD be scanned when introduced to your system. That is all that should be needed. Don't fall for the Fear Mongering that the majors use to sell their super suites.?

[JSWolf]

Try closing Opera to give the system more memory when doing the conversion.

[Quoth]

Also convert/export epub to docx and Use MS Word or LO Writer to clean up and Export as PDF.

[fengli]

Originally Posted by Leseratte_10

What's the issue? When a program is working on a CPU-intensive task like converting a file, having a high CPU usage is expected.

If your system bluescreens just because an application uses a bit of CPU that's an issue with your system.

The main thing is a bit unusually high, just quasi-change 1 thread is very high. But the download is not high even with 4 threads, it feels like there could be potential bugs in the conversion function

[fengli]

Originally Posted by Quoth

That's not high anyway.

I've had stuff (not Calibre) put all 4 cores to nearly 100% and no crash.

100% is a little high, the system is very unstable, very easy to blue screen

[fengli]

Originally Posted by JSWolf

Try closing Opera to give the system more memory when doing the conversion.

As shown in the figure, opera occupies a small cpu, the total memory of 32g, should be enough

[fengli]

Originally Posted by Quoth

Also convert/export epub to docx and Use MS Word or LO Writer to clean up and Export as PDF.

This approach is not efficient and requires a second quasi-exchange, and I have dozens of files

[fengli]

Originally Posted by theducks

What is choking your conversion? The conversion would get done a lot faster if you found (and fixed) the choke point.
More RAM? SSD? Less aggressive A/V setting (there is no need to check a book every step of the way. It SHOULD be scanned when introduced to your system. That is all that should be needed. Don't fall for the Fear Mongering that the majors use to sell their super suites.?

No problems with memory and hard disk, etc., is that the cpu ratio is very high, if you set 2 threads, soon soar to 100%, and then the computer blue screen reboot

[fengli]

Originally Posted by theducks

What is choking your conversion? The conversion would get done a lot faster if you found (and fixed) the choke point.
More RAM? SSD? Less aggressive A/V setting (there is no need to check a book every step of the way. It SHOULD be scanned when introduced to your system. That is all that should be needed. Don't fall for the Fear Mongering that the majors use to sell their super suites.?

A/V setting Real-time protection function is temporarily closed when the quasi-exchange, this virus scan also occupies a high CPU, I am not very professional, but feel that this conversion function may be a little bug

[fengli]

Originally Posted by theducks

What is choking your conversion? The conversion would get done a lot faster if you found (and fixed) the choke point.
More RAM? SSD? Less aggressive A/V setting (there is no need to check a book every step of the way. It SHOULD be scanned when introduced to your system. That is all that should be needed. Don't fall for the Fear Mongering that the majors use to sell their super suites.?

I tried it, the download setting is 5 threads, the CPU occupation ratio is not high, but the conversion even if set to 1 thread, the occupation ratio is very high

[Comfy.n]

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

[DNSB]

Originally Posted by fengli

No problems with memory and hard disk, etc., is that the cpu ratio is very high, if you set 2 threads, soon soar to 100%, and then the computer blue screen reboot

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.