From 2dcfb3a0d00aecf46d2fcb77bda57a86397054eb Mon Sep 17 00:00:00 2001
From: Rodrigo Souto <rodrigo@colivre.coop.br>
Date: Wed, 9 Apr 2014 14:57:25 -0300
Subject: [PATCH] Log periodically memory consumption

---
 config/initializers/log_memory_consumption.rb |  5 +++++
 lib/log_memory_consumption_job.rb             | 26 ++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 0 deletions(-)
 create mode 100644 config/initializers/log_memory_consumption.rb
 create mode 100644 lib/log_memory_consumption_job.rb

diff --git a/config/initializers/log_memory_consumption.rb b/config/initializers/log_memory_consumption.rb
new file mode 100644
index 0000000..cc3acd1
--- /dev/null
+++ b/config/initializers/log_memory_consumption.rb
@@ -0,0 +1,5 @@
+if Delayed::Backend::ActiveRecord::Job.table_exists?
+  jobs = Delayed::Backend::ActiveRecord::Job.all :conditions => ['handler LIKE ?', "%LogMemoryConsumptionJob%"]
+  jobs.map(&:destroy) if jobs.present?
+  Delayed::Backend::ActiveRecord::Job.enqueue(LogMemoryConsumptionJob.new)
+end
diff --git a/lib/log_memory_consumption_job.rb b/lib/log_memory_consumption_job.rb
new file mode 100644
index 0000000..915275f
--- /dev/null
+++ b/lib/log_memory_consumption_job.rb
@@ -0,0 +1,26 @@
+class LogMemoryConsumptionJob < Struct.new(:last_stat)
+  # Number of entries do display
+  N = 20
+  # In seconds
+  PERIOD = 10
+
+  def perform
+    logpath = File.join(Rails.root, 'log', "#{ENV['RAILS_ENV']}_memory_consumption.log")
+    logger = Logger.new(logpath)
+    stats = Hash.new(0)
+    ObjectSpace.each_object {|o| stats[o.class.to_s] += 1}
+    i = 1
+
+    logger << "[#{Time.now.strftime('%F %T %z')}]\n"
+    stats.sort {|(k1,v1),(k2,v2)| v2 <=> v1}.each do |k,v|
+      logger << (sprintf "%-60s %10d", k, v)
+      logger << (sprintf " | delta %10d", (v - last_stat[k])) if last_stat && last_stat[k]
+      logger << "\n"
+      break if i > N
+      i += 1
+    end
+    logger << "\n"
+
+    Delayed::Job.enqueue(LogMemoryConsumptionJob.new(stats), 0, PERIOD.seconds.from_now)
+  end
+end
--
libgit2 0.21.2