Issue #17820 has been updated by Josh Cooper.

Status changed from In Topic Branch Pending Review to Requires CLA to be signed
Assignee set to Per Cederqvist

Linus, since you contributed the original code, we need you to create a redmine 
account and sign a contributor license agreement, see the submitting changes 
section in <https://github.com/puppetlabs/puppet/blob/master/CONTRIBUTING.md>
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Bug #17820: eval_generate is needlessly slow
https://projects.puppetlabs.com/issues/17820#change-77558

Author: Per Cederqvist
Status: Requires CLA to be signed
Priority: Normal
Assignee: Per Cederqvist
Category: performance
Target version: 2.7.21
Affected Puppet version: 2.7.9
Keywords: 
Branch: https://github.com/puppetlabs/puppet/pull/1293


By changing a single line in eval_generate in lib/puppet/transaction.rb I 
managed to speed up "puppet agent --test" from 4494 to 593 seconds. The code 
should produce the same result, but avoids allocating so many hashes.

Here is the diff.  If you prefer, I can create a Git branch et c, but I hope it 
isn't necessary for such a simple fix.

I'm also attaching the output from two ruby-prof runs, in call graph format: 
before and after the change.

(593 seconds is still too much. I suspect I might be submitting a new bug 
report in the not too distant future. :-)  Still, this change should be a 
speedup for everybody, and it shouldn't hurt anybody.)


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