DTraceProbeSimple

A PoC to include DTRACE_PROBE* in Ruby.

Installation

This is only available in Linux for now. Please install systemtap-sdt-dev (or alternatives) first.

Add this line to your application's Gemfile:

gem 'dtrace_probe_simple'

And then execute:

$ bundle

Or install it yourself as:

$ gem install dtrace_probe_simple

Usage

puts $$
require "dtrace_probe_simple"
self.extend DTraceProbeSimple

loop do
  probe(Object.new.inspect)
  print "."
  sleep 1
end

$ ruby probe.rb
9806
.....

Now that USDTruby::ruby-probe is available. You can get data from eBPF/BCC tools such as mruby-bcc.

$ sudo ./mruby/bin/mruby usdt_str.rb 9806
TIME(s)            COMM             PID    ruby-probe
10423.001144000    ruby             9806   #<Object:0x000056054df498b0>
10424.006953000    ruby             9806   #<Object:0x000056054df497e8>
10425.006879000    ruby             9806   #<Object:0x000056054df49720>
10426.007019000    ruby             9806   #<Object:0x000056054df49608>
10427.006803000    ruby             9806   #<Object:0x000056054df494f0>
10428.007604000    ruby             9806   #<Object:0x000056054df49428>
10429.016610000    ruby             9806   #<Object:0x000056054df49360>
10430.017376000    ruby             9806   #<Object:0x000056054df49298>
10431.017446000    ruby             9806   #<Object:0x000056054df491d0>
10432.017105000    ruby             9806   #<Object:0x000056054df490b8>
10433.017682000    ruby             9806   #<Object:0x000056054df48ff0>
10434.017423000    ruby             9806   #<Object:0x000056054df48f28>
10435.019250000    ruby             9806   #<Object:0x000056054df48e38>

Development

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/udzura/dtrace_probe_simple.

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