SQL Server 2008R2 vs 2012 OLTP performance difference - log flushes size different

Hi all,
I'm doing some performance test against 2 identical virtual machine (each VM has the same virtual resources and use the same physical hardware).
The 1° VM has Windows Server 2008R2 and SQL Server 2008R2 Standard Edition
the 2° VM has Windows Server 2012R2 and SQL Server 2012 SP2 + CU1 Standard Edition
I'm using hammerDB (http://hammerora.sourceforge.net/) has benchmark tool to simulate TPC-C test.
I've noticed a significative performance difference between SQL2008R2 and SQL2012, 2008R2 does perform better. Let's explain what I've found:
I use a third VM as client where HammerDB software is installed, I run the test against the two SQL Servers (one server at a time), in SQL2008R2 I reach an higher number of transaction per minutes.
HammerDB creates a database on each database server (so the database are identical except for the compatibility level), and then HammerDB execute a sequence of query (insert-update) simulating the TPC-C standard, the sequence is identical on both servers.
Using perfmon on the two servers I've found a very interesting thing:
In the disk used by the hammerDB database's log (I use separate disk for data and log) I've monitored the Avg. Disk Bytes/Write and I've noticed tha the SQL2012 writes to the log with smaller packet (let's say an average of 3k against an average of 5k written
by the SQL 2008R2).
I've also checked the value of Log flushes / sec on both servers and noticed that SQL2012 do, on average, more log flushes per second, so more log flushes of less bytes...
I've searched for any documented difference in the way log buffers are flushed to disk between 2008r2 and 2012 but found no difference.
Anyone can piont me in the correct direction?

Andrea,
1) first of all fn_db_log exposes a lot of fields that do not exist in SQL2008R2
This is correct, though I can't elaborate as I do not know how/why the changes were made.
2) for the same DML or DDL the number of log record generated are different
I thought as much (but didn't know the workload).
I would like to read and to study what this changes are! Have you some usefu link to interals docs?
Unfortunately I cannot offer anything as the function used is currently undocumented and there are no published papers or documentation by MS on reading log records/why/how. I would assume this to all be NDA information by Microsoft.
Sorry I can't be of more help, but you at least know that the different versions do have behavior changes.
Sean Gallardy | Blog | Microsoft Certified Master

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It looks like we are facing a SQL Server 2008R2 queery optimizer memory leak.
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Microsoft SQL Server 2008 R2 (SP2) - 10.50.4000.0 (X64)
Jun 28 2012 08:36:30
Copyright (c) Microsoft Corporation
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7.11.2014 22:40:57
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2014-11-08 01:22:48.70 spid75       Failed allocate pages: FAIL_PAGE_ALLOCATION 1
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2014-11-08 01:24:02.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.30 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:02.30 Server      SQL Server is terminating a system or background task Fulltext Host Controller Timer Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:02.22 spid74      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:02.22 spid74      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:13.22 spid87      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid63      Error: 701, Severity: 17, State: 130.
2014-11-08 01:24:13.22 spid63      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid57      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.26 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:24.43 spid81      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:24.43 spid81      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:18.25 Server      Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.25 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.18 spid57      Error: 701, Severity: 17, State: 131.
2014-11-08 01:24:35.18 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 spid71      Error: 701, Severity: 17, State: 193.
2014-11-08 01:24:35.18 spid71      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.41 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:35.41 Server      SQL Server is terminating a system or background task SSB Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:35.71 Server      Error: 17053, Severity: 16, State: 1.
2014-11-08 01:24:35.71 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:35.71 spid73      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:35.71 spid73      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:46.30 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17053, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Logon       Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
Last error message is half an hour after the inital Out of memory at 2014-11-08 01:52:54.03. Then the Instance is completely shut down
From the memory information in the error log we can see that all the memory is consumed by the QUERY_OPTIMIZER
Buffer Pool                                   Value
Committed                                   2621440
Target                                      2621440
Database                                     130726
Dirty                                          3682
In IO
0
Latched
1
Free
346
Stolen                                      2490368
Reserved                                          0
Visible                                     2621440
Stolen Potential                                  0
Limiting Factor                                  17
Last OOM Factor                                   0
Last OS Error                                     0
Page Life Expectancy                             28
2014-11-08 01:22:48.90 spid75
Process/System Counts                         Value
Available Physical Memory                29361627136
Available Virtual Memory                 8691842715648
Available Paging File                    51593969664
Working Set                               628932608
Percent of Committed Memory in WS               100
Page Faults                                48955000
System physical memory high                       1
System physical memory low                        0
Process physical memory low                       1
Process virtual memory low                        0
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Memory Manager                                   KB
VM Reserved                               100960236
VM Committed                                 277664
Locked Pages Allocated                     21483904
Reserved Memory                                1024
Reserved Memory In Use                            0
On the other side MDW reports that the MEMORYCLERK_SQLOPTIMIZER increases since the execution of the query up to the point of OUTOF MEMORY, but the Average value is 54.7 MB during that period as can be seen on attached graph.
We have encountered this issue already two times (every time the critical query is executed).

Hi,
This does seems to me kind of memory Leak and actually it is from SQL Optimizer which leaked memory from buffer pool so much that it did not had any memory to be allocated for new page.
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Can you post complete DBCC MEMORYSTATUS output which was generated in errorlog. Is this the only message in errorlog or there are some more messages before and after it.
select (SUM(single_pages_kb)*1024)/8192 as total_stolen_pages, type
from sys.dm_os_memory_clerks
group by typeorder by total_stolen_pages desc
and
select sum(pages_allocated_count * page_size_in_bytes)/1024,type from sys.dm_os_memory_objects
group by type
If you can post the output of above two queries with dbcc memorystaus output on some shared drive and share location with us here. I would try to find out what is leaking memory.
You can very well apply SQL Server 2008 r2 SP3 and see if this issue subsides but I am not sure whether this is fixed or actually it is a bug.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
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Grateful to your time and support. Regards, Shiva

Good day
Shiva Shakthi,
I have change the type of the thread to a question, as this is a question :-)
please chose the right type next time. If you have a question then use a question thread (this is the default), and that will let you mark the answers that you get.
Have a nice day :-)
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After browsing for SQL Server 2008R2 enterprise evaluation edition I came across below link for SQL Server 2008 evaluation but not R2.
http://www.microsoft.com/en-US/download/details.aspx?id=1279
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Hi Kalyan,
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