[GitHub] Param-S commented on issue #7: Use Class Data Sharing for Java actions

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Param-S commented on issue #7: Use Class Data Sharing for Java actions
URL: https://github.com/apache/incubator-openwhisk-runtime-java/issues/7#issuecomment-369563296
 
 
   Effect of CDS on startup and memory. 
   
   Startup time measure by capturing timestamp before invoking the Java command & after server started up. Like
   
   **in Dockerfile:**
   ```
    ///CMD ["java", "-jar", "/javaAction/build/libs/javaAction-all.jar"]
   CMD ["/bin/bash", "/javaAction/run.sh"]
   ```
   
   **in run.sh:**
   ```
   date +%H:%M:%S:%N-%Z   /* capture the time before invoking java command */
   java -jar /javaAction/build/libs/javaAction-all.jar
   ```
   
   **in Proxy.java:**
   ```
       public void start() {
           server.start();
                     **/* capture the time after the Http server start */**
                     ZoneId zoneId = ZoneId.of("UTC");
                    ZonedDateTime ctime = ZonedDateTime.now(zoneId);
                    System.out.println(ctime.toString());
       }
   
   ```
   
   With this change, I measured the startup time for 50 iterations & server startup faster.
   
   <img width="563" alt="screen shot 2018-03-01 at 4 38 06 pm" src="https://user-images.githubusercontent.com/13217743/36842278-3576e85c-1d71-11e8-8288-e75a3c3d33f0.png">
   
   Memory Usage:
   
   ```
   CONTAINER ID        NAME                CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O           PIDS
   388eea3db27f        Xshare       0.11%               17.95MiB / 15.67GiB   0.11%               648B / 0B           0B / 4.1kB          23
   16482b3afcc5        Default      0.13%               19.56MiB / 15.67GiB   0.12%               648B / 0B           0B / 4.1kB          23
   ```
   
   Opened PR #21 to enable CDS. 
   

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