Branch and tag deletions

Joseph Myers
Thu Nov 28 16:46:00 GMT 2019

On Wed, 27 Nov 2019, Eric S. Raymond wrote:

> Joseph Myers <>:
> > One more observation on that: in my last test conversion, deleting the 
> > emptycommit-* tags took over 7 hours (i.e. the bulk of the time for the 
> > conversion was spent just deleting those tags).  Deleting tags matching 
> > /-root$/ took about half an hour.  So I think there is a performance issue 
> > somewhere with (some cases of) tag deletion by regexp, at least when the 
> > regexp matches a large number of tags (but some other bulk deletions seem 
> > to run much quicker per tag).  Taking a few seconds per tag is fine for an 
> > individual deletion, but a problem when you want to delete 4070 tags at 
> > once.
> File that as an issue, please. Go has very good profiling tools, finding
> the hotspot(s) in situations like this is easy and thus we should be able to
> fix this quickly when it reaches the top of the priority list, filed for this performance 
issue. filed for deleted branches 
and tags wrongly reappearing in the conversion. filed for my 
latest rearrangement of tag/branch deletions to help the review of which 
we actually want to delete, commenting out those that ought not be 
necessary any more (many of which then wrongly appear in the conversion 
because of reposurgeon issue 170).

Joseph S. Myers

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