On Tuesday 02 November 2004 07:24 pm, Maurits van Rees wrote: > Find is actually a lot faster. I timed it on my system, as root in > the root dir: > > mauritsvanrees:/# time ls -1RA | egrep -v "^$" | egrep -c -v ":$" > 216348 > > real 4m10.773s > user 0m14.210s > sys 0m19.960s > > mauritsvanrees:/# time find . -regex ".*" | wc -l > 216334 > > real 1m5.149s > user 0m5.560s > sys 0m3.900s
> So `find' is roughly four times as fast. The difference in the number > of files is probably because some files were removed during the > operation, though I'm not completely sure of that. And `find' also > counts the current directory, so it finds one more than the other > solution. I don't agree with your time results: [EMAIL PROTECTED]:/home/robsims: time ls -1RA | egrep -v "^$" | egrep -c -v ":$" 126062 real 0m26.526s user 0m0.665s sys 0m0.658s [EMAIL PROTECTED]:/home/robsims: time find . -regex ".*" | wc -l 126067 real 0m1.651s user 0m0.617s sys 0m0.258s [EMAIL PROTECTED]:/home/robsims: time ls -1RA | egrep -v "^$" | egrep -c -v ":$" 126062 real 0m0.664s user 0m0.469s sys 0m0.189s [EMAIL PROTECTED]:/home/robsims: time find . -regex ".*" | wc -l 126067 real 0m1.193s user 0m0.591s sys 0m0.177s So yes, the second run was much shorter than the first, but only because it was second, not because it was inherently faster. Beware the effects of caching when benchmarking. You can shorten the ls command line: time ls -1RA | egrep -c -v -e "^$" -e ":$" with no significant change in execution time, but fixing the find line: [EMAIL PROTECTED]:/home/robsims: time find . | wc -l 126067 real 0m0.295s user 0m0.119s sys 0m0.177s ...helps quite a bit. My count differents correlates to one "." entry and four directories ending in a colon. -- Rob -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
