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Re: Proposed branch tag performance patch for feature and stable release


From: Mark D. Baushke
Subject: Re: Proposed branch tag performance patch for feature and stable releases
Date: Tue, 16 May 2006 05:12:41 -0700

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Kelly F. Hickel <address@hidden> writes:

Mark D. Baushke
> > 
> > Kelly F. Hickel <address@hidden> writes:
> > 
> > > I just realized that I left out the strncmp!
> > 
> > Yup.
> > 
> > > I've added it to the outline below, along with
> > > some examples).....
> > 
> > > -Kelly
> > >
> > > > -----Original Message-----
> > > > From: Kelly F. Hickel
> > > > Sent: Monday, May 15, 2006 11:10 AM
> > > > To: Mark D. Baushke
> > > > Cc: address@hidden
> > > > Subject: RE: Proposed branch tag
> > > >  performance patch for feature and stable
> > > >  releases
> > > >
> > > > Mark,
> > > >         I've been thinking about how to
> > > > solve this, how does the proposed
> > > > pseudo-code below sound? This seemed like
> > > > a heavy approach given the fact that it's
> > > > creating and sorting a new list, but it
> > > > seems the best way to find the correct
> > > > magic revision number in an efficient way.
> > > > For low branch counts the list will be
> > > > small enough that it should still perform
> > > > well compared to the current code.
> > > >
> > > > findnextmagicrev (given current rev to
> > > > branch, ex: 1.1):
> > 
> > > > 1) Determine number of dots (numdots) in
> > > > the current revision (ex: 1)
> > 
> > > > 2) Create a new list that will receive the
> > > > integer values of the last term of each
> > > > tag that might conflict with the
> > > > candidate.
> > 
> > > > 3)  Walk the list of RCS_symbols:
> > 
> > > >     a) if the rev has numdots+1 (ex: 2
> > > > "1.1.12") AND the strings are identical up
> > > > to the numdots+1 dot (ex:
> > > > strncmp("1.1.0.2", "1.1.12", 3) AND the
> > > > final term is even, insert the integer
> > > > value of the final term into the list.
> > 
> > To be honest, I might consider using the
> > funciton strstr as I am not at all certain I
> > understand how you intend to use numbdots+1 in
> > a strncmp() function call.
> 
> [Kelly F. Hickel] It was just shorthand, I would
> have figured out the length up to the dot I'm
> looking for.
> 
> > 
> > > >     b) if the rev has numdots+2 (ex: 2
> > > > "1.1.0.4") AND the strings are identical
> > > > up to the numdots+2 dot (ex:
> > > > strncmp("1.1.0.2", "1.1.12", 5) AND the
> > > > final term is an even number, AND the term
> > > > before the final term matches
> > > > RCS_MAGIC_BRANCH, insert the integer value
> > > > of the final term into the list.
> > 
> > So, if you observed the following tags
> > 
> >     q:1.23.0.10
> >     p:1.23.0.4
> >     o:1.1.12.1.0.4002
> >     n:1.1.0.18
> >     m:1.1.14.22.0.2
> >     l:1.1.14.22.0.4
> >     k:1.1.0.14
> >     j:1.1.12.1.0.4
> >     i:1.1.0.10
> >     h:1.1.0.1000
> >     g:1.1.8.1.0.2
> >     f:1.1.0.8
> >     e:1.1.0.6
> >     d:1.1.0.4
> >     c:1.1.0.2
> >     b:1.1.0.2000
> >     a:1.1.1.1.0.2
> 
> [Kelly F. Hickel] What's the significance of the
> letters before the colon in the tags above? Is
> that the symbolic name of the tag, or something
> else?

Symbolic name of the tag... I just came up with a
random sampling of tags. It must be presumed that
the 1.1.0.12 magic branch tag was deleted and
likewise with 1.23.0.2, 1.23.0.6, and 1.23.0.8
magic branches.

> > 
> > for a particular RCS file, what magic branch
> > revision would your programv generate as the
> > next revision for each of the given revisions:
> > 
> >   1.1.1.2
> >   1.1
> >   1.24
> >   1.1.2000.1
> >   1.1.18.12
> > 
> > are you able to make any assumptions about the
> > existence of tags like:
> > 
> >  aa:1.1.2.23
> >  ab:1.1.12.14
> >  ac:1.23.2.16
> >  ad:1.1.6.1
> > 
> > > > 4) Call sortlist on the list, sorting it
> > > > into ascending order of integer values.
> > 
> > > > 5) go through the list, find the first
> > > > gap, that's the new magic revision number.
> > > >
> > > > Then I'll have to figure out enough of
> > > > sanity.sh to add a test case for the old
> > > > code, make sure the released codes passes,
> > > > and that my previous patch fails, and that
> > > > the new patch passes.

It can be tricky, if you have cvs commands you
think will demonstrate what you need, feel free to
ask for help turning them into tests.

        -- Mark
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