Hotch

Profile helper

What?

Callstack profiler

• Wraps your program run with stackprof
• Dumps profile results
• Converts a profile dump using graphviz (dot) to SVG
• Optionally shows the call-stack graph after program exit

Memory profiler

• Traces memory allocation using allocation_tracer
• Prints the results formatted and sorted by object count

Example

Callstack profiler

From dry-validation benchmarks/profile_schema_call_valid.rb:

Memory profiler

                        filename     type count old_count total_age min_age max_age total_memsize
                    inline.rb:28  T_IMEMO     1         0         0       0       0             0
dry/struct/class_interface.rb:74  T_IMEMO     1         0         0       0       0             0
dry/struct/class_interface.rb:77  T_IMEMO     1         0         0       0       0             0
       dry/types/decorator.rb:28  T_IMEMO     1         0         0       0       0             0
     dry/types/hash/schema.rb:96  T_IMEMO     2         0         0       0       0             0
     dry/types/hash/schema.rb:52  T_IMEMO     2         0         0       0       0             0
                    inline.rb:27 T_STRING  1000         0         0       0       0             0
                    inline.rb:28   T_HASH  1000         0         0       0       0             0
                    inline.rb:26   T_HASH  1000         0         0       0       0             0
     dry/types/hash/schema.rb:92   T_HASH  2000         0         0       0       0             0
     dry/types/hash/schema.rb:60   T_HASH  2000         0         0       0       0             0
             dry/logic/rule.rb:0  T_ARRAY  2000         0         0       0       0             0
            dry/logic/rule.rb:47 T_OBJECT  2000         0         0       0       0             0
      dry/types/definition.rb:59 T_OBJECT  2000         0         0       0       0             0
dry/struct/class_interface.rb:77 T_OBJECT  2000         0         0       0       0             0
     dry/types/constrained.rb:20   T_DATA  4000         0         0       0       0             0
     dry/types/constrained.rb:27  T_ARRAY  4000         0         0       0       0             0
            dry/logic/rule.rb:47  T_ARRAY  4000         0         0       0       0             0
            dry/logic/rule.rb:47   T_DATA  4000         0         0       0       0             0
      dry/types/definition.rb:51  T_ARRAY  4000         0         0       0       0             0
     dry/types/hash/schema.rb:92  T_ARRAY  6000         0         0       0       0             0
                dry/struct.rb:16 T_STRING  6000         0         0       0       0             0
                           TOTAL          47008         0         0       0       0             0

Installation

Add this line to your application's Gemfile:

gem 'hotch', '~> 0.5.0'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hotch

Usage

Profile complete program

$ ruby -rhotch/run my_program.rb
Profile SVG: /tmp/hotch.my_program20150104-17330-18t4171/profile.svg
$ view /tmp/hotch.my_program20150104-17330-18t4171/profile.svg

Profile blocks in your program

require 'hotch'

def expensive_method
  # ...
end

Hotch() do
  1000.times do
    expensive_method
  end
end

Hotch(aggregate: false) do
  1000.times do
    # this run is not aggregated
  end
end

Hotch() do
  1000.times do
    # aggregated again
  end
end

Auto-view

Set envvar HOTCH_VIEWER to enable auto-view after profiling.

$ export HOTCH_VIEWER=eog # use Gnome viewer

Filter

Set envvar HOTCH_FILTER to (regexp) filter frames by its name.

$ export HOTCH_FILTER=ROM
$ export HOTCH_FILTER=Bundler

Minitest integration

Load hotch/minitest in your test/test_helper.rb like this:

require 'minitest/autorun'
require 'hotch/minitest'

Hotch::Minitest.run
Hotch::Minitest.run(filter: /MyClass/)
Hotch::Minitest.run(options: <stackprof options>)
Hotch::Minitest.run(options: { limit: 200 })

Memory profiler

Require hotch/memory and use Hotch.memory { ... } as in:

require "bundler/setup"

require "dry-types"
require "dry-struct"
require "hotch/memory"

module Types
  class IntStruct < Dry::Struct
    include Dry::Types.module
    constructor_type :strict
    attribute :int, Strict::Int
  end

  class Success < Dry::Struct
    include Dry::Types.module
    constructor_type :strict
    attribute :string, Strict::String
    attribute :sub, Types::IntStruct
  end
end

# For more stable results the GC is disabled by default during runs.
Hotch.memory do
  1000.times do
    Types::Success.new(
      :string => "string",
      :sub => Types::IntStruct.new(:int => 1)
    )
  end
end

# In order to prevent disabling the GC during runs do:
Hotch.memory(disable_gc: false) do
  # ...
end

# Disable aggregation between runs:
Hotch.memory(aggregate: false) do
  # this run is not aggregated
end

Minitest integration for the memory profiler

Load hotch/memory/minitest in your test/test_helper.rb like this:

require 'minitest/autorun'
require 'hotch/memory/minitest'

Hotch::Minitest.run
Hotch::Minitest.run(name: "my name")
Hotch::Minitest.run(disable_gc: false) # on by default

Caveat

Using with bundler

If you use hotch in project managed by bundler you have to specify hotch in Gemfile.(see Installation section above)

Contributing

1. Fork it ( https://github.com/splattael/hotch/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Release

Follow these steps to release this gem:

# Increase version
edit lib/hotch/version.rb
edit README.md
# Commit
git commit -am "Release vX.Y.Z"
rake release