Increase Windows Heap Size to address MMD crashes

Document ID:KM02866330
Creation Date:19-Jul-2017
Modified Date:19-Jul-2017
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Summary

Increase Windows Heap Size to address MMD crashes in Windows Cell Managers

Error

MMD crashes may be the underlying cause to errors such as

[Critical] From: BSM@CM_Host "xxx_DB_LOGS" Time: 5/23/2017 3:00:44 PM

Could not establish connection with MMD within 60 minutes.

Session will be aborted.

Cause

Check Windows Event logs for MMD crashes at that time.

Fix

For the Windows box hosting the MMD (mom) increase the desktop heap via registry setting:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\Windows

Default value is:

%SystemRoot%\system32\csrss.exe ObjectDirectory=\Windows SharedSection=1024,20480,768 Windows=On SubSystemType=Windows ServerDll=basesrv,1 ServerDll=winsrv:UserServerDllInitialization,3 ServerDll=winsrv:ConServerDllInitialization,2 ServerDll=sxssrv,4 ProfileControl=Off MaxRequestThreads=16

change this SharedSection part:
SharedSection=1024,20480,768 -> SharedSection=1024,20480,10240

It’s a performance tuning recommendation for high IO operations such as MMD process on MOM.

For details, see the following: http://blogs.msdn.com/b/ntdebugging/archive/2007/01/04/desktop-heap-overview.aspx