Remote class loading statistics.

changelog.html

@@ -64,6 +64,8 @@ Upcoming changes</a>
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15889">issue 15889</a>)
   <li class=rfe>
     When using container-managed security, display unprotected root actions in the configuration screen for convenience.
+  <li class=rfe>
+    Display class loading statistics in <code>/computer/<i>name</i>/systemInfo</code>.
   <li class=rfe>
     Added <tt>list-plugins</tt> CLI command.
 </ul>

core/src/main/java/hudson/slaves/SlaveComputer.java

@@ -316,6 +316,60 @@ public class SlaveComputer extends Computer {
         setChannel(channel,launchLog,listener);
     }
 
+    /**
+     * Shows {@link Channel#classLoadingCount}.
+     * @since 1.495
+     */
+    public int getClassLoadingCount() throws IOException, InterruptedException {
+        return channel.call(new LoadingCount(false));
+    }
+
+    /**
+     * Shows {@link Channel#resourceLoadingCount}.
+     * @since 1.495
+     */
+    public int getResourceLoadingCount() throws IOException, InterruptedException {
+        return channel.call(new LoadingCount(true));
+    }
+
+    /**
+     * Shows {@link Channel#classLoadingTime}.
+     * @since 1.495
+     */
+    public long getClassLoadingTime() throws IOException, InterruptedException {
+        return channel.call(new LoadingTime(false));
+    }
+
+    /**
+     * Shows {@link Channel#resourceLoadingTime}.
+     * @since 1.495
+     */
+    public long getResourceLoadingTime() throws IOException, InterruptedException {
+        return channel.call(new LoadingTime(true));
+    }
+
+    static class LoadingCount implements Callable<Integer,RuntimeException> {
+        private final boolean resource;
+        LoadingCount(boolean resource) {
+            this.resource = resource;
+        }
+        @Override public Integer call() {
+            Channel c = Channel.current();
+            return resource ? c.resourceLoadingCount.get() : c.classLoadingCount.get();
+        }
+    }
+
+    static class LoadingTime implements Callable<Long,RuntimeException> {
+        private final boolean resource;
+        LoadingTime(boolean resource) {
+            this.resource = resource;
+        }
+        @Override public Long call() {
+            Channel c = Channel.current();
+            return resource ? c.resourceLoadingTime.get() : c.classLoadingTime.get();
+        }
+    }
+
     /**
      * Sets up the connection through an exsting channel.
      *

core/src/main/resources/hudson/slaves/SlaveComputer/statistics.groovy

+h1(_('Remote Class Loader Statistics'))
+def fmt = new java.text.DecimalFormat("0.0")
+def right = 'text-align: right'
+table(class: 'bigtable') {
+    tr {
+        th _('Loading Type')
+        th _('Time (s)')
+        th _('Count')
+    }
+    tr {
+        td _('Classes')
+        td(style: right) {text(fmt.format(my.classLoadingTime / 1000000000))}
+        td(style: right) {text(my.classLoadingCount)}
+    }
+    tr {
+        td _('Resources')
+        td(style: right) {text(fmt.format(my.resourceLoadingTime / 1000000000))}
+        td(style: right) {text(my.resourceLoadingCount)}
+    }
+}

core/src/main/resources/hudson/slaves/SlaveComputer/systemInfo.jelly

@@ -44,6 +44,9 @@ THE SOFTWARE.
           <h2>${t.key}</h2>
           <pre>${t.value}</pre>
         </j:forEach>
+        <j:if test="${it.channel != null}">
+          <st:include page="statistics.groovy"/>
+        </j:if>
       </l:hasPermission>
     </l:main-panel>
   </l:layout>