[GitHub] [incubator-openwhisk] axiqia opened a new issue #4414: Performce: the latency and total run time increase when invoker_user_memory increase?

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axiqia opened a new issue #4414: Performce: the latency and total run time increase when invoker_user_memory increase? 
URL: https://github.com/apache/incubator-openwhisk/issues/4414
 
 
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   ## Environment details:
   
   * local deployment, native ubuntu
   * ubuntu16， 
   * CPU:Xeon(R) CPU E5-2630 v4 * 40
   * memory:252G
   * all the ow component is deployed in a server with one controller and one invoker.
   
   ## Steps to reproduce the issue:
   We first define a simple Node.js action and save it as sleepy.js in the local file system. This action is anything but sophisticated: it just sleeps for a number of milliseconds as specified in its argument and echoes back the argument.
   
   ```
   function main(args) {
       return new Promise(function(resolve, reject) {
         setTimeout(function() {
           resolve({ timeout: args.timeout });
         }, args.timeout);
      })
   }
   ```
   
   We use this simple action only to stress OW, and deploy invoker with `invoker_user_memory` increase from 2048m to 10240M, step by 2048m. 
   
   Then we test OW with `loadtest`（the detail script [here](https://github.com/axiqia/lean-openwhisk-performance/blob/master/repeats.sh)）,  the test iterates over the specified test configurations. 
   
   Each test is replicated 15 times as specified by the repeats parameter to gain statistical significance of the results([detailed](https://github.com/axiqia/lean-openwhisk-performance/blob/master/alllog)).
   
   
   ## Provide the actual results and outputs:
   
   I increase  `invoker_user_memory` for invoker, and it should have more capacity to run more container a time, but our experiment bellow shows that the latency and total run time increase instead of declining.
   
   ![latency](https://github.com/axiqia/lean-openwhisk-performance/blob/master/latency.png)
   ![totaltime](https://github.com/axiqia/lean-openwhisk-performance/blob/master/totaltime.png)
   
   
   ## Additional information you deem important:
   * Relevant issues https://lists.apache.org/thread.html/dfccf972bc1419fe48dbc23119441108c45f85d53625fd6f8fc04fcb@%3Cdev.openwhisk.apache.org%3E

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