[issue13564] ftplib and sendfile()

[Charles-François Natali]

Charles-François Natali added the comment:

Here's the result of a benchmark sending a 1GB file over a Gb/s ethernet network:
vanilla:
real    0m9.446s
user    0m0.493s
sys     0m1.425s

sendfile:
real    0m9.143s
user    0m0.055s
sys     0m0.986s

The total time doesn't vary much (the reduction above is just jitter).
But it reduces user+sys time by almost a factor of 2.

Note that is changed Giampaolo's patch to call sendfile on the whole file, not by block.

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nosy: +neologix

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