On Wed, Feb 15, 2012 at 4:51 PM, Clive Standbridge
<list-u...@tgstandbridges.plus.com> wrote:
>> But may provide some benefit when removing a large number (30000) of
>> files (at least empty ones).
>>
>> cbell@circe:~/test$ time find rm -type f -exec rm {} \;
>>
>> real 0m48.127s
>> user 1m32.926s
>> sys 0m38.750s
>
> First thought - how much of that 48 seconds was spent on launching
> 30000 instances of rm? It would be instructive to try
>
> time find rm -type f -exec rm {} \+
>
> or the more traditional xargs:
>
> time find rm -type f -print0 | xargs -0 -r rm
>
> Both of those commands should minimise the number of rm instances.
> Similarly for unlink.
Here are the test results:
cbell@circe:~/test$ time find rm -type f -exec rm {} \+
real 0m0.953s
user 0m0.064s
sys 0m0.884s
cbell@circe:~/test$
cbell@circe:~/test$ time find rm -type f -print0 | xargs -0 -r rm
real 0m0.823s
user 0m0.080s
sys 0m0.824s
cbell@circe:~/test$
It doesn't seem possible to run a similar test for unlink as it
appears it only operates on 1 file at a time. So it does seem that rm
with the find and/or xargs options you provided is the best way to go
(at least for this test case).
--
Chris
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