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class RagelProfiler
MEM_CONVERSION = 1024
COMMANDS = { :compile => %w(ragel rlgen-cd gcc-4.0 gnumake cc1),
:test => %w(ruby) }
FIELDS = %w(compile_time compile_max_rss test_time test_max_rss file_size)
@@results = {}
def initialize(name)
@name = name
@@results[name] = []
end
def measure(type)
raise "not a valid type" unless COMMANDS.keys.include?(type)
regex = COMMANDS[type].map {|c| Regexp.escape(c) }.join("|")
t = Thread.new do
Thread.current[:max] = 0
loop do
Thread.current[:max] = [run(regex), Thread.current[:max]].max
sleep 0.5
end
end
begin_time = Time.now
yield
total_time = Time.now - begin_time
t.kill
store_result(type, "time", total_time)
store_result(type, "max_rss", t[:max])
end
def ext_size(file)
store_result(:file, "size", File.size(file) / MEM_CONVERSION)
end
def self.results
out = []
out << "name\t" + FIELDS.join("\t")
@@results.each do |name, results|
out << [name, results ].flatten.join("\t")
end
out.join("\n")
end
private
def store_result(type, metric, value)
index = FIELDS.index("#{type.to_s}_#{metric}")
@@results[@name][index] = "%.2f" % value
end
def run(ps_regex)
ps_command = "ps axucww"
ps_output = `#{ps_command}`
fields = ps_output.to_a.first.downcase.split
memory_index = fields.index("rss")
pid_index = fields.index("pid")
ppid_index = fields.index("ppid")
total = ps_output.grep(/(#{ps_regex})\s+$/i).map do |com|
Float(com.split[memory_index]).abs
end.inject(0) { |s,v| s += v }
if total
return total/MEM_CONVERSION
else
STDERR.puts "Command not found. No processes found matching #{ps_regex}."
end
end
end
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