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STORES 株式会社 Visualize the internal state of Ruby processes in Real-Time @hogelog (Sunao Komuro) RubyKaigi 2024 Lightning Talk STORES, Inc.

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Who is hogelog? 2 - @hogelog (GitHub, Twitter, …) - 小室 直 (Sunao Komuro) - Software Engineer at STORES, Inc. - I like Ruby and programming

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What I created

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metrics_monitor gem 4 - https://github.com/hogelog/metrics_monitor - Visualize internal state of a Ruby program - mm

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Why I created metrics_monitor 5 - There are some Ruby programs out there with issues - CPU, Memory, ... - Some I wrote myself, and some that were already around - Everyone wants to solve problems

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Finding Ruby program issues 6 - Profiler? - pf2, ruby-prof, stackprof, memory_profiler, … excellent! - APM? - Datadog, Scout APM, … great! - But, I wanted an easier way to observe

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My true trigger 7 - Frankly, I wanted VisualVM for Ruby - https://visualvm.github.io/ -

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Let’s demo 8 str = "foobar" 10.times do str = str*8 sleep 3 end

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How to create

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Ruby Program Child Process Main Process metrics_monitor metrics_monitor components 11 - Components: Collector, Visualizer Visualizer Main Collector Collector Child Collector … … Pipe Target Program HTTP

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Custom Collector 12 class RandomCollector < MetricsMonitor::Collector::CollectorBase def self.default_options = { enabled: true, interval: 5_000 } def meta_data = { title: "Random", monitors: [{ key: :random, title: "Random values", type: :chart, mode: :line }], data: { random: { mode: "append" } }, } def data = { random: rand } end

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Built-in Collectors: BasicCollector 13 - Basic metrics collector like cpu, memory and etc

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Built-in Collectors: GcStatCollector 14 - Garbage collection statistics collector

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Built-in Collectors: ObjectStatCollector 15 - Object statistics collector

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Built-in Collectors: ObjectTraceCollector 16 - Object tracing data collector

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Conclusion

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Summary 18 - I created metrics_monitor gem - Plug in and visualize program's internal state - Set up a simple collector to interactively visualize - More casual research options before serious analysis - Happy ruby programming, profiling, monitoring, analysis!

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Future work 19 - Attaching without `require` - More extensive visualizer - Improving the overloaded collectors - Dynamically configure collectors from the view - Overall improvements