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Old 03-23-2013, 09:06 AM   #1
Ansem_93
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Column for see formats?

Hi at all, there is a method for creat a column for see what's the format of my ebook? I have a lot of books: pdf,epub,mobi. So i want see what's their formats (if it's more thant one) i one column

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Old 03-23-2013, 09:53 AM   #2
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Yes. You can add a column that shows the format(s) of the book.

http://manual.calibre-ebook.com/faq....column-for-foo

Warning: If you add this column, and you have a lot of books, you may find that calibre takes a long time to start. The reason is that all the formats of all books are checked every time you start calibre, in order to set the values of the column.

For a discussion about this problem, and a possible solution, see: https://www.mobileread.com/forums/sho...d.php?t=188312
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Old 03-23-2013, 07:13 PM   #3
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Interesting -I show a Formats Column but I don't have a problem with start times - unless my opening View is sorted by formats - which it never is

But the presence of the Formats Column is the cause of my 'scroll button feels like its in treacle' complaint. So... maybe my Formats Column has got to go.

Maybe the devs could put something indicating what formats exist for book into the database - and reconcile/fix in Library Check. But keep what's shown in Book Details as it is now - i.e. what's actually there

BR
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Old 03-23-2013, 07:41 PM   #4
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Quote:
Originally Posted by BetterRed View Post
Interesting -I show a Formats Column but I don't have a problem with start times - unless my opening View is sorted by formats - which it never is

But the presence of the Formats Column is the cause of my 'scroll button feels like its in treacle' complaint. So... maybe my Formats Column has got to go.

Maybe the devs could put something indicating what formats exist for book into the database - and reconcile/fix in Library Check. But keep what's shown in Book Details as it is now - i.e. what's actually there

BR
Formats for a title do show in the Details pane.
You can Search for/with a format using the Tag Browser.

So Why the need to have them show all the time?
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Old 03-24-2013, 03:39 AM   #5
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Maybe the devs could put something indicating what formats exist for book into the database - and reconcile/fix in Library Check. But keep what's shown in Book Details as it is now
It is already there.

Use {:'approximate_formats()'} instead of {formats}, and everything should be fine. At least if you only use calibre to delete or add book formats. Then approximate_formats() will retrieve the existing formats from the db, without any need to actually check the actual books.
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Old 03-24-2013, 05:01 AM   #6
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It is already there.

Use {:'approximate_formats()'} instead of {formats}, and everything should be fine. At least if you only use calibre to delete or add book formats. Then approximate_formats() will retrieve the existing formats from the db, without any need to actually check the actual books.
Thanks Adoby I didn't know about that, just added the column and happy to report that my database approx-formats accords 100% with the actual files, but...

When I removed the Formats column (see earlier post) my scroll bar stickiness disappeared, which 'made sense' - no need to interrogate folder contents.

So I turned computer off and went to lunch happy in the knowledge that my sticky scroll button niggle had been resolved/explained away.

When I came back I reinstated the Formats column and... the scroll bar stickiness did not come back, and... wait for it... sort on Formats column (theDucks, that's why I have it) on the whole library (20,000+ books) was almost instantaneous - it used to be a minute or two.

Maybe everything is 'cached', maybe my virus scanner is making Calbre faster, maybe I inadvertently hijacked the NSA computers. Own up Kovid, what did you do :lol:

its probably Heisenberg, or Eisenstein.

BR
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Old 03-24-2013, 06:34 AM   #7
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Are you sure you aren't sorting on the approximate formats? That might explain the speed boost.

I remember rebuilding databases over weekends to improve performance. Like defragmenting a harddrive. Not sure if sqlite benefits from that... Perhaps that was what happened when you removed and added the formats column?
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Old 03-24-2013, 07:15 AM   #8
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Are you sure you aren't sorting on the approximate formats? That might explain the speed boost.

I remember rebuilding databases over weekends to improve performance. Like defragmenting a harddrive. Not sure if sqlite benefits from that... Perhaps that was what happened when you removed and added the formats column?
Adoby, I did not know about approx formats until I read your post, my observations on improved performance occurred earlier - definitely on the {formats} variant. I now have both columns - scrolling performance is the same (i.e. good) irrespective of whether neither, either or both are displayed and sorting on either is the same too - damn quick.

If the formats column is based on the book folder contents then I wouldn't have thought sqllite database optimising would help much. It has to be something in the Windows NTFS file system - I haven't installed anything new - hardware or sofware.

Win 7 defrags on the fly, maybe its reached an optimal state so that my Library has become packed onto adjacent tracks - the amount of IO seeks appears to be very small as I browse the library. I click on a cover in the cover browser and the book pops up in a viewer more or less instantly.

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Old 03-24-2013, 07:49 AM   #9
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The template {formats} is evaluated in several steps.

1) When {formats} is referenced for a book, check if it has been resolved and cached for that book. If so, return that value.
2) If the formats for a book have not been resolved, then verify the formats for the book. For each format:
- Check if that format has been resolved in the past. If so, use those values. This cache can be cleared if the content server is running and determines that its view of the database is out of date.
- If the format has not been resolved, do a "stat()" on the format file. Cache the path, the size, and the modtime of the format. Return these values. Return an empty record if the format does not exist.
3) If {formats} is never referenced, never do either step 1 or step 2.

The effects of the caches make getting consistent results from timing tests rather problematic. For example, sorting on {formats} will fill both caches. From that time forward, there will be no disk access. Which cache is used depends on the test.

The "treacle" test should be done in a way that ensures that the caches have not been filled. Something like:
- Ensure that the {formats} column is not in the startup sort set.
- Start calibre.
- Scroll down.

My guess is that calibre will be noticeably slower scrolling when there is a {formats} column. It must do a stat on each format for the book before it can display the book line. The approximate_formats() function avoids this work.
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Old 03-25-2013, 04:15 AM   #10
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Originally Posted by chaley View Post
The template {formats} is evaluated in several steps.

1) When {formats} is referenced for a book, check if it has been resolved and cached for that book. If so, return that value.
2) If the formats for a book have not been resolved, then verify the formats for the book. For each format:
- Check if that format has been resolved in the past. If so, use those values. This cache can be cleared if the content server is running and determines that its view of the database is out of date.
- If the format has not been resolved, do a "stat()" on the format file. Cache the path, the size, and the modtime of the format. Return these values. Return an empty record if the format does not exist.
3) If {formats} is never referenced, never do either step 1 or step 2.

The effects of the caches make getting consistent results from timing tests rather problematic. For example, sorting on {formats} will fill both caches. From that time forward, there will be no disk access. Which cache is used depends on the test.

The "treacle" test should be done in a way that ensures that the caches have not been filled. Something like:
- Ensure that the {formats} column is not in the startup sort set.
- Start calibre.
- Scroll down.

My guess is that calibre will be noticeably slower scrolling when there is a {formats} column. It must do a stat on each format for the book before it can display the book line. The approximate_formats() function avoids this work.
@chaley - do the caches persist across calibre starts, and do they persist across reboots ?

Yesterday I put { formats } back into my Default View (View Manager), it may have slowed my calibre start from 1-2 secs to 3-4 secs - but IMO thats just almost within the normal margin of variability - and plenty good enough for moi.

And I am still getting smooth scrolling and fast sorts on that column, even after several restarts of calibre, system shutdowns and cold boots etc

It's very odd - it's not just calibre that's working faster, so are my music and image library programs - quodlibet and iMatch. Even firefox feels snappier. This morning my fixed line phone wasn't working, called the telco, couple of hours later there was a man in the street fixing it!

BR
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Old 03-25-2013, 04:56 AM   #11
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Perhaps you've accidentally pressed the turbo button on your computer?
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Old 03-25-2013, 05:24 AM   #12
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Old 03-25-2013, 06:36 AM   #13
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@chaley - do the caches persist across calibre starts, and do they persist across reboots ?
Neither. They are rebuilt on demand during each calibre execution.
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Old 03-25-2013, 10:14 AM   #14
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Neither. They are rebuilt on demand during each calibre execution.
Correct, they wouldn't be caches if they persisted

I just uploaded about 2000 images into iMatch - that used to take about 8-10 minutes, took 4m 49secs. Same disks, same memory, same processor, same video card, same mobo, same software!

I give up, guess I'll just have to put up with a faster computer. If I can figure out why this has happened I'll let y'all know .

BR
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Old 03-25-2013, 12:45 PM   #15
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Perhaps you've accidentally pressed the turbo button on your computer?
You are old as dirt
IIRC my last Mobo that supported the Turbo button, was a 286 board.
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