- What would be your rule of thumb regarding how many goroutines to start, 
considering to the parameters of the original question?

- How would you generally go about deciding on a convenient fan-out level?

On Monday, 20 February 2017 09:26:44 UTC+1, Tamás Gulácsi wrote:
>
> The general optimization problem is the packing problem, NP-complete. So 
> no fast optimal solution exists.
> But fast-enough, suboptimal does. Search for a sat-solver.
>
> Btw time of computing md5 is size-dependent, so sort by size in descending 
> order, and use a buffered channel as token bucket, with a predefined token 
> "size".
> For example if you measure that a 1Mb file needs 128k memory, then use a 
> token for each mb of file, and limit bucket size by memory limit in 128k 
> units.
>
> If bucket is not big enough for the file, try the next (smaller).
> But if you start a goroutine for each file, and the bucket uses channels, 
> eventually reducing the selection to a "select", you'll get a suboptimal 
> but easy and reasonable solution.
>
>

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