New Profiler


#1

One of the rules of optimizing OO programs is to create less objects.

Like a Good Green Environmentalist, you should Reduce, Recycle & Reuse.

The next question is what objects are being created.

My memory profiler I posted last year tells you that…
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/139987

It digs into ObjectSpace and sees what objects are currently alive.

Very good for reducing the memory footprint, but not much use for
decreasing garbage collection.

So, here is my nifty NewProfiler which tells where what class of object
is
being created…

http://www.rubygarden.org/ruby?NewProfiler

Just slap this code at the head of program and run…

class Class
alias_method :orig_new, :new

@@count = 0
@@stoppit = false
@@class_caller_count = Hash.new{|hash,key| hash[key] = Hash.new(0)}

def new(*arg,&blk)
unless @@stoppit
@@stoppit = true
@@count += 1
@@class_caller_count[self][caller[0]] += 1
@@stoppit = false
end
orig_new(*arg,&blk)
end

def Class.report_final_tally
@@stoppit = true
puts “Number of objects created = #{@@count}”

 total = Hash.new(0)

 @@class_caller_count.each_key do |klass|
   caller_count = @@class_caller_count[klass]
   caller_count.each_value do |count|
     total[klass] += count
   end
 end

 klass_list = total.keys.sort{|klass_a, klass_b|
   a = total[klass_a]
   b = total[klass_b]
   if a != b
     -1* (a <=> b)
   else
     klass_a.to_s <=> klass_b.to_s
   end
 }
 klass_list.each do |klass|
   puts "#{total[klass]}\t#{klass} objects created."
   caller_count = @@class_caller_count[ klass]
   caller_count.keys.sort_by{|call| -1*caller_count[call]}.each do

|call|
puts “\t#{call}\tCreated #{caller_count[call]} #{klass}
objects.”
end
puts
end
end
end

END {
b = String.new
Class.report_final_tally
}

John C. Phone : (64)(3) 358 6639
Tait Electronics Fax : (64)(3) 359 4632
PO Box 1645 Christchurch Email : removed_email_address@domain.invalid
New Zealand

Carter’s Clarification of Murphy’s Law.

“Things only ever go right so that they may go more spectacularly wrong
later.”

From this principle, all of life and physics may be deduced.