Solved [TC 8.0 x64] Slower loading in CbC tool than 32 bit version

[petermad]

Testing the Compare by Content tool with big files (187 Mb big *.reg files) I noticed this that the 64bit version is about 3 times slower than the 32bit version loading the files.

It takes 29 seconds to load the two files in the 64bit version.
It takes 10 seconds to load the same two files in the 32bit version.

In both tests the files are already in Windows cache (I test 2 times and measure the second loading).

[ghisler(Author)]

The source code for comparing is exactly the same. It's either because all pointers are now 64-bit, or because Lazarus is optimizing worse than Delphi 2.

[petermad]

Hmm, 300% slower - that is a big difference to accept for running 64bit

[ghisler(Author)]

I only see a factor of 2 here, but this may depend on the compared files. Currently I don't see any way to speed it up.

[Lefteous]

2ghisler(Author)
Use Delphi XE2.

[ghisler(Author)]

If you can wait another year until I have ported TC to it? I can't.

[petermad]

History.txt:

15.11.11 Fixed: Compare by content: Increase load speed (slowdown caused by try..except block) (64)

This has helped a lot. Loading the two files mentioned in the first post now only takes 15 seconds in the x64 version in stead of 29 seconds. So it is not so far from the 10 seconds the 32bit version uses.

[ghisler(Author)]

Thanks!