2010/12/23 Iñaki Baz Castillo <ibc@aliax.net>:
>> Try it on a tmpfs mount.
>
> Yes, that would be my next test.

Hummm, I get "non expected" results when using a tmpfs as destination
for the copy. I attach a new test file which makes usage of IO splice
in different ways ("manual", using IO objects and using file names).

Results:


Test data:
- Source file size:  464 bytes
- Number of iterations:  1
Results:
- FileUtils.cp:                     0.0004868507385253906
- FileUtils.copy_stream:            7.581710815429688e-05
- IO.splice (manual):               0.0004825592041015625
- IO.splice (using IO):             0.00017380714416503906
- IO.splice (using file names):     0.00012922286987304688


Test data:
- Source file size:  464 bytes
- Number of iterations:  100
Results:
- FileUtils.cp:                     0.005738258361816406
- FileUtils.copy_stream:            0.0026025772094726562
- IO.splice (manual):               0.038815975189208984
- IO.splice (using IO):             0.016385793685913086
- IO.splice (using file names):     0.009386062622070312


Test data:
- Source file size:  1156222 bytes
- Number of iterations:  1
Results:
- FileUtils.cp:                     0.0017499923706054688
- FileUtils.copy_stream:            0.0020220279693603516
- IO.splice (manual):               0.001650094985961914
- IO.splice (using IO):             0.001832723617553711
- IO.splice (using file names):     0.0017614364624023438


Test data:
- Source file size:  1156222 bytes
- Number of iterations:  100
Results:
- FileUtils.cp:                     0.20581936836242676
- FileUtils.copy_stream:            0.19777441024780273
- IO.splice (manual):               0.1709754467010498
- IO.splice (using IO):             0.19835829734802246
- IO.splice (using file names):     0.1958324909210205

-- 
Iñaki Baz Castillo
<ibc@aliax.net>