Jira (BOLT-1119) SPIKE - understand why bolt is so slow on windows

[Ethan Brown (JIRA)]

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Ethan Brown commented on BOLT-1119   Re: SPIKE - understand why bolt is so slow on windows Using a Windows 10 local VM with Ruby 2.5 and running Ruby / Bolt from source (with bundler) inside the ruby-prof profiler has generated some useful information.  A typical bundle exec bolt --help on a clean system takes about 4.5 seconds. By comparison, simply loading irb takes under a second.   There are two areas to further explore:   About 85% of the time is spent in Rubys Kernel.require. While it's unlikely that performance of that core Ruby call can be improved, we may be able to make some optimizations around when code is loaded. In areas where code can be lazy loaded, it may be advantageous to do so, since expectations are that a typical --help should respond immediately. Next step is to add something like https://github.com/ruby-prof/ruby-prof/issues/159 to introduce more diagnostic information / analyze further. It's not yet determined if the majority of this time is loading PAL (Puppet As Library) - which it very well may be. 18% of the time is spent in a gem scan performed by the LittlePlugger gem - specifically in this line - https://github.com/TwP/little-plugger/blob/master/lib/little-plugger.rb#L191 (It's possible that loggers plugin system may be disabled to avoid running this code path)   A couple of additional notes:   Focus thus far has been on the most simple of cases - improving the experience around loading Bolt help. Additional work is still TBD for loading actual module / plan code and metadata, running tasks, etc. At least in this test environment, installing more gem code to the Ruby module path appears to degrade performance. Run times of 4.5 seconds lengthen to 5+ seconds. Other local changes have caused runs to degrade to 12+ seconds (still investigating if this is an anomaly or reproducible) Add Comment   This message was sent by Atlassian JIRA (v7.7.1#77002-sha1:e75ca93) -- You received this message because you are subscribed to the Google Groups "Puppet Bugs" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-bugs+unsubscr...@googlegroups.com. To post to this group, send email to puppet-bugs@googlegroups.com. Visit this group at https://groups.google.com/group/puppet-bugs. For more options, visit https://groups.google.com/d/optout.