[MacPorts] #63068: base: performance: operations slower in 2.7.x vs. 2.6.4: reclaim, rev-upgrade, clean

[MacPorts]

#63068: base: performance: operations slower in 2.7.x vs. 2.6.4: reclaim, rev-
upgrade, clean
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:
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 I've noticed that the three operations mentioned - reclaim, rev-upgrade,
 and clean - are noticeably slower with MacPorts 2.7.x vs. 2.6.4.

 Per some discussion with Josh, we believe there haven't been any notable
 changes to these operations for the 2.7.x releases, so they should perform
 similarly to v2.6.4.

 The standard disclaimer applies: As I'm running on an ancient 2008-era
 MacPro, I'm far more likely to notice things like this vs. 99% of our
 users. Nonetheless, if there is a performance regression - and it can be
 identified and resolved - it will be to everyone's benefit.

 In terms of the approach: We'll enable TCL profiling, and generate results
 for each of the three operations (reclaim, rev-upgrade, clean), across
 both v2.6.4 and v2.7.1. To ensure we're comparing apples-to-apples, that
 will be done via a cloned VM, with an identical set of installed ports.
 The operations will also be run twice, with the first run done to prime
 the filesystem cache. The 2nd run will include profiling enabled.

 This should be very straightforward: It's simply a matter of generating
 results, upgrading MacPorts, and repeating the process. Once done, I'll
 attach the various profiler outputs for analysis.

 Thoughts/comments welcome, as always.

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Ticket URL: <https://trac.macports.org/ticket/63068>
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