Initial commit

sys/apis/profile.lua

@@ -0,0 +1,50 @@
+local Logger = require('logger')
+
+local Profile = { 
+  start = function() end,
+  stop = function() end,
+  display = function() end,
+  methods = { },
+}
+ 
+local function Profile_display()
+  Logger.log('profile', 'Profiling results')
+  for k,v in pairs(Profile.methods) do
+    Logger.log('profile', '%s: %f %d %f',
+      k, Util.round(v.elapsed, 2), v.count, Util.round(v.elapsed/v.count, 2))
+  end
+  Profile.methods = { }
+end
+ 
+local function Profile_start(name)
+  local p = Profile.methods[name]
+  if not p then
+    p = { }
+    p.elapsed = 0
+    p.count = 0
+    Profile.methods[name] = p
+  end
+  p.clock = os.clock()
+  return p
+end
+ 
+local function Profile_stop(name)
+  local p = Profile.methods[name]
+  p.elapsed = p.elapsed + (os.clock() - p.clock)
+  p.count = p.count + 1
+end
+ 
+function Profile.enable()
+  Logger.log('profile', 'Profiling enabled')
+  Profile.start = Profile_start
+  Profile.stop = Profile_stop
+  Profile.display = Profile_display
+end
+ 
+function Profile.disable()
+  Profile.start = function() end
+  Profile.stop = function() end
+  Profile.display = function() end
+end
+
+return Profile