I'm doing a bit of memory testing in my 4.1 tree, and I haven't found
anything all *that* exciting yet. I'm using a objectspace profiler by
Ryan Davis, lightly modified to produce a bit more info. Two things
seem obvious:
1. Cached hits don't leak anything. The total number of objects
per type in the system doesn't change at all .
2. Uncached hits leak 1-3 strings per page.
I haven't tested admin yet.
Here's the profiler. Start it from environment.rb and it'll log to a file.
class MemoryProfiler
def self.start(delay=10)
Thread.new do
prev = Hash.new(0)
curr = Hash.new(0)
delta = Hash.new(0)
file = File.open('log/memory_profiler.log','w')
loop do
begin
GC.start
curr.clear
ObjectSpace.each_object do |o|
curr[o.class] += 1 #Marshal.dump(o).size rescue 1
end
delta.clear
(curr.keys + delta.keys).uniq.each do |k,v|
delta[k] = curr[k]-prev[k]
end
file.puts "Top 20"
delta.sort_by { |k,v| -v.abs }[0..19].sort_by { |k,v|
-v}.each do |k,v|
file.printf "%+5d: %s (%d)\n", v, k.name, curr[k] unless v == 0
end
file.flush
delta.clear
prev.clear
prev.update curr
rescue Exception => err
STDERR.puts "** memory_profiler error: #{err}"
end
sleep delay
end
end
end
end
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