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From "Michal Fojtik (JIRA)" <>
Subject [jira] [Commented] (DTACLOUD-290) Memory leaking on Fedora 17
Date Wed, 01 Aug 2012 10:53:03 GMT


Michal Fojtik commented on DTACLOUD-290:


After some debugging we tried this patch that seems to solve the problem of memory growing.
However, the memory usage after first request still jump to 1.5gb.

diff --git a/server/lib/deltacloud/helpers/driver_helper.rb b/server/lib/deltacloud/helpers/driver_helper.r
index 5c5e7c6..96fd1d7 100644
--- a/server/lib/deltacloud/helpers/driver_helper.rb
+++ b/server/lib/deltacloud/helpers/driver_helper.rb
@@ -49,8 +49,12 @@ module Deltacloud::Helpers
     def driver
       $:.unshift File.join(File.dirname(__FILE__), '..', '..')
-        require_relative driver_source_name
-        driver_class
+       @@driver ||= nil
+       unless @@driver
+         puts "Loading driver..."
+          require_relative driver_source_name
+       end
+        @@driver ||= driver_class
       rescue LoadError => e
         raise "[ERROR] The driver '#{driver_name}' is unknown or not installed (#{driver_source_name})\n"

> Memory leaking on Fedora 17
> ---------------------------
>                 Key: DTACLOUD-290
>                 URL:
>             Project: DeltaCloud
>          Issue Type: Bug
>          Components: Server
>         Environment: deltacloud-core-1.0.0-4.fc17.noarch (though same issue with dc-core
from git)
> sinatra (1.3.2)
> sinatra-rabbit (1.0.6)
> Fedora 17
>            Reporter: Jan Provaznik
>            Priority: Critical
> Memory used by deltacloudd process increases with time. After 12 hours, it's common it
uses ~4G of virt memory and >1G of physical memory (only conductor's dbomatic script which
periodically checks running instances every minute was running).
> You can reproduce the memory leak by this simple script:
> #!/usr/bin/ruby                                                                 
> require 'rubygems'                                                              
> require 'deltacloud'                                                            
> 1000.times do |i| {'mockuser', 'mockpassword', 'http://localhost:3002/api')
> Used memory will increase by >10M (both virt and physical). The problem is probably
with lambda in check_capability usage in lib/deltacloud/collections/* files:
> check_capability :for => lambda { |m| driver.respond_to? m }
> if the lambda is replaced by true or other static value, the memory usage remains constant.
> I see that in git the 'check_capability' call was replaced by 'set' call, this change
has no influence on this problem.
> Also it's weird that after starting deltacloudd, used memory is 233m/33m (virt/res),
but after first request, used memory jumps to 776m/90m (virt/res) - this is far more than
on Fedora 16, where used memory remains around 160m/50m.

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