AWE Allocated Values Reported Incorrectly (Large or Negative Value)

Published Jan 15 2019 12:54 PM 73 Views
Microsoft
First published on MSDN on Apr 21, 2010

I ran into an issue today that is documented but you have to know where to find it so I wanted to point it out.

In the middle of a lengthy KB article # 907877 ( http://support.microsoft.com/kb/907877 ) the the following comment.

"In a NUMA-enabled system, this value can be incorrect or negative. However, the overall AWE Allocated value in the Memory Manager section is a correct value."

I received this output from an customer today.   When I investigated it I found a known issue that was not corrected in SQL Server 2005 that allows a calculation to rollover a LONG value but prints out a LONGLONG value.  So depending on the calculation it may a negative or an unexpected large value in some instances.

SQL 2008: I did find a source check-in for SQL Server 2008 that corrects the behavior.

WORKAROUND: You can look at the 'Memory Manager' AWE Allocated to get the correct AWE Allocated value instead.

WS 2003 Enterprise x86

Total Physical Memory  36,350.82 MB

SQL Server 2005 x86 Enterprise

MEMORYCLERK_SQLBUFFERPOOL (Total)                                 KB

---------------------------------------------------------------- --------------------

VM Reserved                                                                  1506552

VM Committed                                                                  155612

AWE Allocated                                                             4309540864

SM Reserved                                                                        0

SM Committed                                                                        0

SinglePage Allocator                                                               0

MultiPage Allocator                                                             7752

My math might be wrong here but AWE Allocated 4309540864 = ~4 Terabytes!??

Here is the BPOOL breakdown for each node.  Node 0 looks * more correct * but not really sure if I can trust it.

(7 rows affected)

MEMORYCLERK_SQLBUFFERPOOL (node 0)                                KB

---------------------------------------------------------------- --------------------

VM Reserved                                                                  1506552

VM Committed                                                                   86704

AWE Allocated                                                               17399808                = 16 GB

SM Reserved                                                                        0

SM Commited                                                                        0

SinglePage Allocator                                                               0

MultiPage Allocator                                                             7752

(7 rows affected)

MEMORYCLERK_SQLBUFFERPOOL (node 1)                                KB

---------------------------------------------------------------- --------------------

VM Reserved                                                                        0

VM Committed                                                                   68908

AWE Allocated                                                             4292141056 = ~4 TB

SM Reserved                                                                        0

SM Commited                                                                        0

SinglePage Allocator                                                               0

MultiPage Allocator                                                                0

Bob Dorr - Principal SQL Server Escalation Engineer


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Version history
Last update:
‎Jan 15 2019 12:54 PM
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