On 04.09.2012 13:05, Oto BREZINA wrote:
> I decided to try own baton implementation for file diff. Even I known
> your opinion, I still think it is worthy to try.
> Expected gain:
> - remove need of temporary file handling
> - speed increase (text is already divided into lines, no need to convert
> to UTF8 (from UTF16), no need access file system) I expected double the
> - implementation of our own normalizing rules (EOLS(all we support),
> whitespaces, ....)
> - possibly less memory consumption
> I took diff_memory.c and tweak it to my needs, basically it means to use
> tokens from CFileTextLines.
> After I make it work (without normalizing for a moment) it runs a way
> slower then diff_file solution. 1.3 to almost 2 times slower.
> Do you have any idea why it that? My only guess is that baton code is
> too far from diff code, so we have cache misses. Maybe some windows
> protection while jumping to/from code boundary dll to main code?
I doubt that. Such problems wouldn't cause a two times slowdown.
> I have no idea why it can be that slower. I use already vector as base
> class as it is bit faster then deque on read.
> I will try to use original codes for diff_file in main code to see if it
> is implementation or some other issue.
> I also think about to use modified diff_memory - remade for wchar_t as
> we have whole file converted to UTF16 in memory in some load stages.
> For a moment only one of four gain is made.
> I found that you implemented SVNLineDiff.
> What is your experience with it ?
It works - it's used for the inline diff.
> Why did you implemented your own Adler32 methode?
Because the one in the svn lib is private and not exported.
> Why you and svn guys start Adler32 with 0, when according to
> http://en.wikipedia.org/wiki/Adler-32#The_algorithm A is initialized to
> 1? Shouldn't we start Adler32 with 1 as checksum?
No idea - I just copied the function.
I just noticed (build from saturday) that there's a serious problem with
editing: when saving edits and reloading, the diff is sometimes
completely different, i.e. it does not save what you've edited but
You can see that if you have "compare whitespaces" enabled.
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Received on 2012-09-04 22:31:52 CEST