Module: MemoryProfiler::TopN

Included in:
StatHash
Defined in:
lib/memory_profiler/top_n.rb

Instance Method Summary collapse

Instance Method Details

#top_n(max, metric_method) ⇒ Object

Fast approach for determining the top_n entries in a Hash of Stat objects. Returns results for both memory (memsize summed) and objects allocated (count) as a tuple.



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# File 'lib/memory_profiler/top_n.rb', line 7

def top_n(max, metric_method)

  stat_totals =
    self.values
      .group_by(&metric_method)
      .map do |metric, stats|
        [metric, stats.reduce(0) { |sum, stat| sum + stat.memsize }, stats.size]
      end

  stats_by_memsize =
    stat_totals
      .sort_by! { |metric, memsize, _count| [-memsize, metric] }
      .take(max)
      .map! { |metric, memsize, _count| { data: metric, count: memsize } }

  stats_by_count =
    stat_totals
      .sort_by! { |metric, _memsize, count| [-count, metric] }
      .take(max)
      .map! { |metric, _memsize, count| { data: metric, count: count } }

  [stats_by_memsize, stats_by_count]
end