>>>>> "Jakub" == Jakub Narebski <jnareb@xxxxxxxxx> writes: Jakub> First benchmarks showed that no_chdir was some faster. I have rechecked, Jakub> and they are the same within the margin of error, perhaps without Jakub> no_chdir is slightly faster. 447 +/- 11 ms vs. 450 +/- 10 ms according Jakub> to ApacheBench (ab -n 10). Any benchmarks will certainly depend on the O/S as well. The advantage to chdir is that the name-to-inode lookups don't need to keep retraversing the upper directories. And keep in mind that caching will affect the benchmarks on that. As for that whole -d thing... If you use _, you have to keep in mind whether the previous call was a stat() or an lstat(). Both lstat() (explictly) and -l use lstat(). Everything else is a stat(). So, "-l and not -d" uses an lstat to determine that we're looking at a symlink, but a stat to determine that the item pointed at is not a directory. NEVER use readlink(), as it very likely will require a lot of flattening for you to simulate what the OS does. (See my article on that at <http://www.stonehenge.com/merlyn/UnixReview/col27.html>.) -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 <merlyn@xxxxxxxxxxxxxx> <URL:http://www.stonehenge.com/merlyn/> Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training! - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html