Class: MwrapRack::HeapPages

Inherits:
Object
  • Object
show all
Includes:
HtmlResponse
Defined in:
lib/mwrap_rack.rb

Overview

:nodoc:

Constant Summary collapse

HEADER = 
'<tr><th>address</th><th>generation</th></tr>'
GC_STAT_URL = 
'https://docs.ruby-lang.org/en/trunk/GC.html#method-c-stat'
GC_STAT_HELP = 
<<~EOM
  <p>Non-Infinity lifespans can indicate fragmentation.
  <p>See <a
  href="#{GC_STAT_URL}">#{GC_STAT_URL}</a> for info on GC.stat values.
EOM

Instance Method Summary collapse

Methods included from HtmlResponse

#response

Instance Method Details

#each ⇒ Object 



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# File 'lib/mwrap_rack.rb', line 121

def each
  Mwrap.quiet do
    yield("<html><head><title>heap pages</title></head>" \
          "<body><h1>heap pages</h1>" \
          "<table><tr><th>stat</th><th>value</th></tr>\n" \
          "#{hpb_rows}" \
          "#{gc_stat_rows}" \
          "</table>\n" \
          "#{GC_STAT_HELP}" \
          "<table>#{HEADER}")
    Mwrap::HeapPageBody.each do |addr, generation|
      addr = -sprintf('0x%x', addr)
      yield(-"<tr><td>#{addr}</td><td>#{generation}</td></tr>\n")
    end
    yield "</table></body></html>\n"
  end
end

#gc_stat_rows ⇒ Object 



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# File 'lib/mwrap_rack.rb', line 106

def gc_stat_rows
  GC.stat(stat = Thread.current[:mwrap_gc_stat] ||= {})
  %i(count heap_allocated_pages heap_eden_pages heap_tomb_pages
      total_allocated_pages total_freed_pages).map do |k|
     "<tr><td>GC.stat(:#{k})</td><td>#{stat[k]}</td></tr>\n"
  end.join
end

#hpb_rows ⇒ Object 



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# File 'lib/mwrap_rack.rb', line 96

def hpb_rows
  Mwrap::HeapPageBody.stat(stat = Thread.current[:mwrap_hpb_stat] ||= {})
  %i(lifespan_max lifespan_min lifespan_mean lifespan_stddev
     deathspan_max deathspan_min deathspan_mean deathspan_stddev
     resurrects
    ).map! do |k|
     "<tr><td>#{k}</td><td>#{stat[k]}</td></tr>\n"
  end.join
end