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Re: [PATCH v4 0/4] Add --no-ahead-behind to status

On 1/8/2018 2:49 PM, Ben Peart wrote:

On 1/8/2018 10:48 AM, Jeff Hostetler wrote:
From: Jeff Hostetler <jeffhost@xxxxxxxxxxxxx>

This is version 4 of my patch series to avoid expensive ahead/behind
calculations in status.  This version removes the last commit containing
the experimental config setting.  And removes the undefined return values
for the nr_ahead/nr_behind arguments as discussed on the mailing list.

While I like the simplicity of just turning this off completely, I do wonder if we could come up with a better user experience.  For example, could we somehow limit the time spent computing the before/after and if it exceeds that limit, drop back to saying they are "different" rather than computing the exact number of commits before/after.

I was thinking about something similar to the logic we use today about whether to start reporting progress on other long commands. That would mean you could still get the ahead/behind values if you aren't that far behind but would only get "different" if that calculation gets too expensive (which implies the actual value isn't going to be all that helpful anyway).

After a off-line conversation with the others I'm going to look into
a version that is limited to n commits rather than be completely on or
off.  I think if you are for example less than 100 a/b then those numbers
have value; if you are past n, then they have much less value.

I'd rather do it by a fixed limit than by time to ensure that output
is predictable on graph shape and not on system load.