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

[MacPorts]

#63068: base: performance: operations slower in 2.7.x vs. 2.6.4: reclaim, clean
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  base     |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:           |
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Description changed by mascguy:

Old description:

> I've noticed that the two operations mentioned - reclaim 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.

New description:

 I've noticed that the two operations mentioned - reclaim 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 operations (reclaim and 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#comment:5>
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