[GitHub] dubeejw commented on issue #2730: Reduce memory consumption for action invocation

[git]

dubeejw commented on issue #2730: Reduce memory consumption for action 
invocation
URL: 
https://github.com/apache/incubator-openwhisk/pull/2730#issuecomment-332299004
 
 
   Profiling of action invocations using the changes provided in this PR and 
without these changes. The action is a 34 MB zipped Node action. 
   
   With WhiskActionMetadata changes:
   <img width="509" alt="screen shot 2017-09-26 at 2 46 09 pm" 
src="https://user-images.githubusercontent.com/11520887/30878095-c7623960-a2c9-11e7-9cc0-f17af3120f67.png";>
   
   Without WhiskActionMetadata changes:
   <img width="506" alt="screen shot 2017-09-26 at 3 19 09 pm" 
src="https://user-images.githubusercontent.com/11520887/30879947-fd223fa0-a2ce-11e7-88fe-39fa5ee24ff4.png";>
   
   First action invocation is a cache miss causing the controller to fetch the 
action from the DB. This means the code associated with the action is 
downloaded into the controller causing a spike in the used heap. Garbage 
collection is then performed to lower the used heap. The same action is then 
invoked three times without the previous heap increase since the action is now 
cached, which does not cause a fetch from the DB.
   
   Primarily the difference in the above graphs is that the non-modified 
controller caches the action's zip file causing the controller to consume more 
heap space than the modified controller after garbage collection is performed.
   
 
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