optimisign conversion speed - use 2 hard drives ? - Page 2

kovidgoyal · 10-12-2010, 10:53 AM

Oh and the biggest bottleneck in conversion is usually CSS parsing, because the library calibre uses to parse CSS is based on regexes and so is very slow.

Manichean · 10-12-2010, 11:03 AM

Quote:

Originally Posted by kovidgoyal

Oh and the biggest bottleneck in conversion is usually CSS parsing, because the library calibre uses to parse CSS is based on regexes and so is very slow.

So, basically, the assumption that the cost in CPU time is way higher than disk I/O operations is correct?

kovidgoyal · 10-12-2010, 11:08 AM

Quote:

Originally Posted by Manichean

So, basically, the assumption that the cost in CPU time is way higher than disk I/O operations is correct?

Yes, disk I/O is completely irrelevant.

cybmole · 10-12-2010, 11:09 AM

Quote:

Originally Posted by kovidgoyal

just to shed some light on the the number of processes issue:....

thank you for that excellent explanation. maybe you should add it to the user guide / FAQ documentation sometime ?

chaley · 10-12-2010, 11:11 AM

Quote:

Originally Posted by kovidgoyal

Quote:

Originally Posted by Manichean View Post
So, basically, the assumption that the cost in CPU time is way higher than disk I/O operations is correct?

Yes, disk I/O is completely irrelevant.

Do you mean when doing conversions? Or are you saying that calibre is never (or at least very seldom) I/O-bound?

kovidgoyal · 10-12-2010, 11:12 AM

Quote:

Originally Posted by chaley

Do you mean when doing conversions? Or are you saying that calibre is never (or at least very seldom) I/O-bound?

conversions.

itimpi · 10-12-2010, 11:12 AM

This valuable information. Is it in the User Guide section that describes this setting? If not I would suggest adding it so that in future when the question comes up you can just reference that section. Alternatively it could go into the FAQ.

kovidgoyal · 10-12-2010, 11:25 AM

http://calibre-ebook.com/user_manual...s-on-my-system

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10-12-2010, 10:53 AM	#16
kovidgoyal creator of calibre Posts: 45,364 Karma: 27230406 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Oh and the biggest bottleneck in conversion is usually CSS parsing, because the library calibre uses to parse CSS is based on regexes and so is very slow.

10-12-2010, 11:12 AM	#22
itimpi Wizard Posts: 4,553 Karma: 950151 Join Date: Nov 2008 Device: Sony PRS-950, iphone/ipad (Marvin/iBooks/QuickReader)	This valuable information. Is it in the User Guide section that describes this setting? If not I would suggest adding it so that in future when the question comes up you can just reference that section. Alternatively it could go into the FAQ.

10-12-2010, 11:25 AM	#23
kovidgoyal creator of calibre Posts: 45,364 Karma: 27230406 Join Date: Oct 2006 Location: Mumbai, India Device: Various	http://calibre-ebook.com/user_manual...s-on-my-system

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