Calibre's high memeory and sevices usage

vanroth · 03-25-2010, 08:11 PM

I apologize if this subject has been covered before, I did a general search of the forum however, besides the fact that I love the application, I have a question, why is it that calibre uses 5 separate "parallel" services as well as the application requirements for 20K each (total memory hit of 193K in service memory) plus the additional hits of approx 35K for the console host for each of the parallel services. Can this not be managed within one service and or application to decrease cpu cycles. I am not necessarily complaining as I have an i7-860 cpu with 12gigs ram etc but I always look at the service and memory hit each program requires.

Again, I love the program and use it actively....... but would like some info on the memory and service hits.

best regards;

Roelof

ardeegee · 03-25-2010, 11:01 PM

1.) You must mean an M everywhere you have a K
2.) A separate thread for each core is made so several books can be processed in parallel. Sure, it could use one thread instead of 5-- it would simply take 5 times longer to process all the files.

Skydog · 03-25-2010, 11:09 PM

Quote:

Originally Posted by vanroth

I apologize if this subject has been covered before, I did a general search of the forum however, besides the fact that I love the application, I have a question, why is it that calibre uses 5 separate "parallel" services as well as the application requirements for 20K each (total memory hit of 193K in service memory) plus the additional hits of approx 35K for the console host for each of the parallel services. Can this not be managed within one service and or application to decrease cpu cycles. I am not necessarily complaining as I have an i7-860 cpu with 12gigs ram etc but I always look at the service and memory hit each program requires.

Again, I love the program and use it actively....... but would like some info on the memory and service hits.

best regards;

Roelof

You may get the response you need asking your question in the Calibre forum where Kovid (developer of Calibre) resides.

DawnFalcon · 03-26-2010, 12:11 AM

Quote:

Originally Posted by ardeegee

2.) A separate thread for each core is made so several books can be processed in parallel. Sure, it could use one thread instead of 5-- it would simply take 5 times longer to process all the files.

Yes, but it doesn't need to show a separate process for each thread. I suspect, actually, that the actual total memory usage is what is shown for a single instance and that the display of separate processes is simply a Calibre bug.

kovidgoyal · 03-26-2010, 12:18 AM

calibre doesn't run separate tasks in threads, but in actual separate processes.

And worker processes consume no resources when they are idle. All modern OSes keep the memory requirements of idle processes in swap if your system RAM is running low.

vanroth · 03-26-2010, 02:51 PM

Well, I got all the answers I expected to get and I thank all those who took the time to respond.

vanroth

This thread is now closed

ardeegee · 03-26-2010, 04:08 PM

Uh, no it isn't.

I am now the Prince of Chichester!

CleverClothe · 03-27-2010, 03:08 PM

A helpful tip is that you can change the number of these background processes that Calibre creates in Preferences->Advanced.

03-25-2010, 08:11 PM	#1
vanroth Junior Member Posts: 2 Karma: 10 Join Date: Mar 2010 Device: MyPal 636n (win ce 6.0	Calibre's high memeory and sevices usage I apologize if this subject has been covered before, I did a general search of the forum however, besides the fact that I love the application, I have a question, why is it that calibre uses 5 separate "parallel" services as well as the application requirements for 20K each (total memory hit of 193K in service memory) plus the additional hits of approx 35K for the console host for each of the parallel services. Can this not be managed within one service and or application to decrease cpu cycles. I am not necessarily complaining as I have an i7-860 cpu with 12gigs ram etc but I always look at the service and memory hit each program requires. Again, I love the program and use it actively....... but would like some info on the memory and service hits. best regards; Roelof

03-26-2010, 02:51 PM	#6
vanroth Junior Member Posts: 2 Karma: 10 Join Date: Mar 2010 Device: MyPal 636n (win ce 6.0	Calibre's high memory and sevices usage Well, I got all the answers I expected to get and I thank all those who took the time to respond. vanroth This thread is now closed

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03-25-2010, 11:01 PM	#2
ardeegee Maratus speciosus butt Posts: 3,292 Karma: 1162698 Join Date: Sep 2009 Device: PRS-350	1.) You must mean an M everywhere you have a K 2.) A separate thread for each core is made so several books can be processed in parallel. Sure, it could use one thread instead of 5-- it would simply take 5 times longer to process all the files.

03-26-2010, 12:18 AM	#5
kovidgoyal creator of calibre Posts: 43,850 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	calibre doesn't run separate tasks in threads, but in actual separate processes. And worker processes consume no resources when they are idle. All modern OSes keep the memory requirements of idle processes in swap if your system RAM is running low.

03-26-2010, 04:08 PM	#7
ardeegee Maratus speciosus butt Posts: 3,292 Karma: 1162698 Join Date: Sep 2009 Device: PRS-350	Uh, no it isn't. I am now the Prince of Chichester!

03-27-2010, 03:08 PM	#8
CleverClothe Guru Posts: 618 Karma: 493394 Join Date: Jun 2008 Location: Seattle, WA Device: iRex iLiad, Onyx Boox 60	A helpful tip is that you can change the number of these background processes that Calibre creates in Preferences->Advanced.

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