Lars Wirzenius, le Tue 17 Jan 2012 10:45:20 +0000, a écrit : > > > Personally, I would be wary of using checksums for file comparisons, > > > since comparing files byte-by-byte isn't slow (you only need to > > > do it to files that are identical in size, and you need to read > > > all the files anyway). > > > > In some cases you may have a lot of files with identical size, so at > > least a simple SSE-prone thing like crc is useful. > > That's a good point. However, the pathological case would need to > be quite pathological, since you can check around a thousand files > of the same time at the same time (i.e., the number of open files > per process), which is fairly rare for most people. But not all > people, of course.
I'm not sure to understand what you mean exactly. If you have even just a hundred files of the same size, you will need ten thousand file comparisons! Using a hash reduces that to indexing the hundred file hashes. Samuel -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120117110341.gl4...@type.bordeaux.inria.fr
