title: Server memory usage reporting incorrect?
body: <p>I have a Windows 2016 Server (128GB Ram), running SQL Server 2016, and I'm seeing some unusual figures on the memory usage reporting.</p>
  
  <p>I'm used to seeing SQL Server using a lot of memory (we have this one limited to 96GB) but I'm seeing this being reported strangely in Task Manager.  I am seeing 75% memory usage but only 755.5MB against SQL Server.  While there are other services running in the background, the total does not come anywhere near 75% of 128GB.</p>
  
  <p><a href="https://i.stack.imgur.com/eMmUd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eMmUd.png" alt="Task Manager"></a></p>
  
  <p>The 75% is the being reflected in Performance manager as I'd expect, with 96% being committed to SQL.</p>
  
  <p><a href="https://i.stack.imgur.com/CNfQ6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CNfQ6.png" alt="enter image description here"></a></p>
  
  <p>Internally in sql server, I am getting similar figures from internal reporting.</p>
  
  <pre><code>SELECT  (physical_memory_in_use_kb / 1024)          Phy_Memory_usedby_Sqlserver_MB
  ,       (locked_page_allocations_kb / 1024)         Locked_pages_used_Sqlserver_MB
  ,       (virtual_address_space_committed_kb / 1024) Total_Memory_UsedBySQLServer_MB
  ,       process_physical_memory_low
  ,       process_virtual_memory_low
    FROM  sys.dm_os_process_memory;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/C34IG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/C34IG.png" alt="enter image description here"></a></p>
  
  <p>I've been asked to investigate why the task manager is showing such a low usage when we would expect it to be so much higher.  If there is a general misunderstanding on my part here, then please let me know.  If there are any further tests I can perform to help track this down then I'm happy to do so.</p>
  
  <p>Many thanks in advance.</p>