CODEWITHSUNDEEP
python
pynovice
pynovice

Reputation: 7752

How to find the expected file transfer duration in Python?

I am using rsync to transfer files using rsync in Python. I have the basic UI where user can selects the file and initiate the transfer. I want to show the Expected Time Duration to transfer all the files they selected. I know the total size of all the files in bytes. What's the smart way to show them the expected file transfer duration? It doesn't have to be exact precise.

Upvotes: 0

Views: 581

Answers (1)

m.brindley
m.brindley

Reputation: 1228

To calculate an estimated time to completion for anything, you simply need to keep track of the amount of time taken to transfer the data currently completed and base your estimate for the rest of the data on the past speed. Once you get that basic method, there are all sorts of ways you can adjust your estimate to take account of acceleration, congestion and other effects - for example, taking the amount of data transferred in the last 100 seconds, breaking this down into 20s increments and calculating a weighted mean speed.

I'm not familiar with using rsync in Python. Are you just calling it using os.exec*() or are you using something like pysync (http://freecode.com/projects/pysync)? If you are spawning rsync processes, you'll struggle to get granular data (esp. if transferring large files). I suppose you could spawn rsync --progress and get/parse the progress lines in some sneaky way but that seems horridly awkward.

Upvotes: 1

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