Add some simple profiling output to core:archive command (#13215)

* Initial code to gather performance measurements across processes.

* Get proof of concept to work.

* couple tweaks

* Modified to use a custom log file instead of option table.

* add peak memory value

1 files changed, 25 insertions, 1 deletions

diff --git a/core/Timer.php b/core/Timer.php
index 3aea3db1b9..835b1659bc 100644
--- a/core/Timer.php
+++ b/core/Timer.php
@@ -61,7 +61,23 @@ class Timer
      */
     public function getMemoryLeak()
     {
-        return "Memory delta: " . $this->formatter->getPrettySizeFromBytes($this->getMemoryUsage() - $this->memoryStart);
+        return "Memory delta: " . $this->getMemoryLeakValue();
+    }
+
+    /**
+     * @return string
+     */
+    public function getMemoryLeakValue()
+    {
+        return $this->formatter->getPrettySizeFromBytes($this->getMemoryUsage() - $this->memoryStart);
+    }
+
+    /**
+     * @return string
+     */
+    public function getPeakMemoryValue()
+    {
+        return $this->formatter->getPrettySizeFromBytes($this->getPeakMemoryUsage());
     }
 
     /**
@@ -93,4 +109,12 @@ class Timer
         }
         return 0;
     }
+
+    public function getPeakMemoryUsage()
+    {
+        if (function_exists('memory_get_peak_usage')) {
+            return memory_get_peak_usage();
+        }
+        return 0;
+    }
 }