https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242828
Bug ID: 242828
Summary: diff -rq still does full file comparison
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
In a task of mine I often have to "diff -rq" two directories which have ~75000
files; those files are usually very similar, with a only a few lines differing.
Some of them have up to 25M lines.
On 11.3 (which feature GNU diff), the whole process usually take a few minutes.
On 12.1 (which feature BSD diff), I was never able to complete it: most of the
times I just interrupted it after some hours, but in a case it did crash the
whole system due to an out of swap situation (16GB RAM + 32GB swap!!!).
I tried to find out the reason with gdb and I am convinced that:
_ 11.3, as soon as it sees a file differs, will move to the next one;
_ OTOH, 12.1 will still compute the whole diff set for that file, although it
just have to print "File x and y differ".
Of course, there's a workaround as simple as installing textproc/diffutils and
using "gdiff" instead of "diff".
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