From fc941fa88b5eb88a2980c68b1c4f78680031ad0d Mon Sep 17 00:00:00 2001
From: Florian Staudacher <florian_staudacher@yahoo.de>
Date: Thu, 5 Apr 2012 22:21:30 +0200
Subject: [PATCH 1/2] try monitoring used memory an GC by that

---
 spec/support/deferred_garbage_collection.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/spec/support/deferred_garbage_collection.rb b/spec/support/deferred_garbage_collection.rb
index 2cca9142a..7819e558a 100644
--- a/spec/support/deferred_garbage_collection.rb
+++ b/spec/support/deferred_garbage_collection.rb
@@ -11,7 +11,12 @@ class DeferredGarbageCollection
   end
 
   def self.reconsider
-    if DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD
+    mem = %x(free).split(" ")
+    percent_used = mem[8].to_i / (mem[7].to_i/100)
+
+    puts "percent memory used #{percent_used}" # just for info, as soon as we got some numbers remove it
+
+    if( (DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD) || percent_used > 90 )
       GC.enable
       GC.start
       GC.disable

From e1d86bddcf9e0f5fbe3014a37edd775442e22012 Mon Sep 17 00:00:00 2001
From: Maxwell Salzberg <maxwell@joindiaspora.com>
Date: Thu, 5 Apr 2012 14:29:41 -0700
Subject: [PATCH 2/2] some tweaks so it fails gracefully on systems that do not
 have free command

---
 features/support/env.rb                     |  4 ++--
 spec/spec_helper.rb                         |  4 ++--
 spec/support/deferred_garbage_collection.rb | 25 ++++++++++++++++-----
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/features/support/env.rb b/features/support/env.rb
index 790a9d194..2842b175e 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -104,8 +104,8 @@ end
 # https://makandracards.com/makandra/950-speed-up-rspec-by-deferring-garbage-collection
 require File.join(File.dirname(__FILE__), "..", "..", "spec", "support", "deferred_garbage_collection")
 Before do
-  DeferredGarbageCollection.start unless ENV['TRAVIS']
+  DeferredGarbageCollection.start
 end
 After do
-  DeferredGarbageCollection.reconsider unless ENV['TRAVIS']
+  DeferredGarbageCollection.reconsider 
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f8badfa43..f373e9b36 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -105,9 +105,9 @@ end
 # https://makandracards.com/makandra/950-speed-up-rspec-by-deferring-garbage-collection
 RSpec.configure do |config|
   config.before(:all) do
-    DeferredGarbageCollection.start unless ENV['TRAVIS']
+    DeferredGarbageCollection.start
   end
   config.after(:all) do
-    DeferredGarbageCollection.reconsider unless ENV['TRAVIS']
+    DeferredGarbageCollection.reconsider 
   end
 end
diff --git a/spec/support/deferred_garbage_collection.rb b/spec/support/deferred_garbage_collection.rb
index 7819e558a..4461c9397 100644
--- a/spec/support/deferred_garbage_collection.rb
+++ b/spec/support/deferred_garbage_collection.rb
@@ -7,16 +7,27 @@ class DeferredGarbageCollection
   @@last_gc_run = Time.now
 
   def self.start
+    return if unsupported_enviroment
     GC.disable if DEFERRED_GC_THRESHOLD > 0
   end
 
+  def self.memory_threshold
+    mem = %x(free 2>/dev/null).to_s.split(" ")
+    return nil if mem.empty?
+    mem[8].to_i / (mem[7].to_i/100)
+  end
+
   def self.reconsider
-    mem = %x(free).split(" ")
-    percent_used = mem[8].to_i / (mem[7].to_i/100)
+    return if unsupported_enviroment
 
-    puts "percent memory used #{percent_used}" # just for info, as soon as we got some numbers remove it
-
-    if( (DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD) || percent_used > 90 )
+    if (percent_used = self.memory_threshold)
+      running_out_of_memory = percent_used > 90
+      puts "percent memory used #{percent_used}" # just for info, as soon as we got some numbers remove it
+    else
+      running_out_of_memory = false
+    end
+ 
+    if( (DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD) || running_out_of_memory )
       GC.enable
       GC.start
       GC.disable
@@ -24,4 +35,8 @@ class DeferredGarbageCollection
     end
   end
 
+  def self.unsupported_enviroment
+    # ENV['TRAVIS']
+  end
+
 end