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List:       kstars-devel
Subject:    Re: [Kstars-devel] Binary star data loading accomplished in Branch!
From:       Akarsh Simha <akarshsimha () gmail ! com>
Date:       2008-06-02 19:44:02
Message-ID: 20080602193201.GO4636 () PENGUIN
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> If you are reading from two files at the same time, you are causing
> a bunch of seeks to occur as the disk head has to ping pong between
> the two files on disk.  If one of the files is small, it is much more
> efficient to read the entire small file first and store it in memory.
> That way the data file can be read sequentially without having to seek
> over to the names file and then back to the data file.

Oh! I didn't consider that. Yes. That makes things clear.

> As a simple test, you could eliminate the reading of names and see what
> effect this has on the time it takes to load the stars.

I'll try this out.

> Also, you don't want to run HTMesh->index() when initializing stars=20
> because this call is very expensive.  We want to use the trixel numbers
> that were stored in the datafile.

Yes. That's a good point too. I should first figure out how the trixel
number stored in the data file compares with that used by HTMesh.

Regards
Akarsh

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