Calibre not using all CPU cores.

mufler · 10-06-2013, 08:01 PM

Hi,

I have installed Calibre on a server without GUI, therefore I only use Calibre from command-line.

My server has 4 CPU cores, but Calibre only uses 1 for a conversion job. I would like it to use all 4 when I start a conversion.

I have tried to look into global.py and tweaks.py, but I cannot find any parametre for forcing all CPU cores.

Does anybody know if it is possible for Calibre to use all CPU cores? And tell me where I can find configuration for this?

I have another machine with GUI Calibre installed, and from this interface I have found a setting: max simultaneous conversion jobs (Preference ->Misc)
Does this setting do what I desire? And If yes, how can I change this setting from command-line?

Grateful for all replies!

theducks · 10-06-2013, 08:39 PM

Quote:

Originally Posted by mufler

Hi,

I have installed Calibre on a server without GUI, therefore I only use Calibre from command-line.

My server has 4 CPU cores, but Calibre only uses 1 for a conversion job. I would like it to use all 4 when I start a conversion.

I have tried to look into global.py and tweaks.py, but I cannot find any parametre for forcing all CPU cores.

Does anybody know if it is possible for Calibre to use all CPU cores? And tell me where I can find configuration for this?

I have another machine with GUI Calibre installed, and from this interface I have found a setting: max simultaneous conversion jobs (Preference ->Misc)
Does this setting do what I desire? And If yes, how can I change this setting from command-line?

Grateful for all replies!

1 core, 1 conversion
4 conversions, 4 cores (if allowed in preferences)

Calibre can not split a single job. It is a pipeline that needs to complete in sequence

theducks · 10-06-2013, 08:41 PM

Moderator Notice
Please read the 'read first' stickies at the top of the forums. Moved out of development

mufler · 10-07-2013, 08:59 AM

Quote:

Originally Posted by theducks

1 core, 1 conversion
4 conversions, 4 cores (if allowed in preferences)

Calibre can not split a single job. It is a pipeline that needs to complete in sequence

Many thanks for your reply. I was curious about this because I tried Amazons Kindlegen v.2.9, which made use of all 4 cores in 1 conversion job. And therefore it did convert same book much faster than Calibre.

But I like Calibre much better because of all the variety of functionality it gives

10-06-2013, 08:01 PM	#1
mufler Junior Member Posts: 4 Karma: 10 Join Date: Sep 2013 Device: none	Calibre not using all CPU cores. Hi, I have installed Calibre on a server without GUI, therefore I only use Calibre from command-line. My server has 4 CPU cores, but Calibre only uses 1 for a conversion job. I would like it to use all 4 when I start a conversion. I have tried to look into global.py and tweaks.py, but I cannot find any parametre for forcing all CPU cores. Does anybody know if it is possible for Calibre to use all CPU cores? And tell me where I can find configuration for this? I have another machine with GUI Calibre installed, and from this interface I have found a setting: max simultaneous conversion jobs (Preference ->Misc) Does this setting do what I desire? And If yes, how can I change this setting from command-line? Grateful for all replies!

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10-06-2013, 08:41 PM	#3
theducks Well trained by Cats Posts: 30,972 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Moderator Notice Please read the 'read first' stickies at the top of the forums. Moved out of development

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