Fix an issue calculating analysis server cpu usage.

pkg/analysis_server/lib/src/utilities/profiling.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:io';
 
 /// A class that can return memory and cpu usage information for a given
 /// process.
 abstract class ProcessProfiler {
@@ skipping 14 matching lines @@
     // Not a supported platform.
     return null;
   }
 }
 
 class UsageInfo {
   /// A number between 0.0 and 100.0 * the number of host CPUs (but typically
   /// never more than slightly above 100.0).
   final double cpuPercentage;
 
-  /// The process memory usage in bytes.
+  /// The process memory usage in kilobytes.
   final int memoryKB;
 
   UsageInfo(this.cpuPercentage, this.memoryKB);
 
   double get memoryMB => memoryKB / 1024;
+
+  String toString() => '$cpuPercentage% ${memoryMB.toStringAsFixed(1)}MB';
 }
 
 class _PosixProcessProfiler extends ProcessProfiler {
+  static final RegExp stringSplitRegExp = new RegExp(r'\s+');
+
   _PosixProcessProfiler() : super._();
 
   @override
   Future<UsageInfo> getProcessUsage(int processId) {
     try {
       // Execution time is typically 2-4ms.
       Future<ProcessResult> future =
           Process.run('ps', ['-o', '%cpu=,rss=', processId.toString()]);
       return future.then((ProcessResult result) {
         if (result.exitCode != 0) {
@@ skipping 15 matching lines @@
       return result.exitCode == 0 ? _parse(result.stdout) : null;
     } catch (e) {
       return null;
     }
   }
 
   UsageInfo _parse(String psResults) {
     try {
       // "  0.0 378940"
       String line = psResults.split('\n').first.trim();
-      List<String> values = line.split(' ');
+      List<String> values = line.split(stringSplitRegExp);
       return new UsageInfo(double.parse(values[0]), int.parse(values[1]));
     } catch (e) {
       return null;
     }
   }
 }