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What is sysmain.dll?

Part of Superfetch Service Host by Microsoft

What is it?

SuperFetch is a technology that pre-loads commonly used applications into memory to reduce their load times. SuperFetch attempts to load commonly used libraries and application components into memory before they are required. It does so by continually analyzing application behavior and usage patterns.
(sysmain.dll is a system file that is installed with Windows)
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How is sysmain.dll loaded?

Autoplay handler - sysmain.dll is typically associtated with identifier name of MSCreateRdbCache with and identifier of SOFTWARE\Microsoft\Windows\ CurrentVersion\Explorer\AutoplayHandlers\Handlers\MSCreateRdbCache. Autoplay will scan removable media, when it arrives, looking for media content types (music, graphics, or video). When a removable media arrives, Windows determines what actions to perform by evaluating the content and comparing it to registered handlers for that content. An application will register a handler for Autoplay events associated with a media type.
Hosted service - sysmain.dll is typically associtated with identifier name of cda9f1373805af88f6fa4f2064bba24d with and identifier of SysMain. A Windows Hosted Service is a service that is implemented as dynamically-linked library (DLL) run under the (Service Host) SvcHost process.
Scheduled task - sysmain.dll is launched automatically by registering itself into the Windows Task Scheduler under the task name '\Microsoft\Windows\Sysmain\WsSwapAssessmentTask'. Task Scheduler provides the ability to schedule the launch of programs or scripts at pre-defined times or after specified time intervals or even with event-based triggers.

Community

What is the community is seeing?What is the community is doing?
About 0.1% of all Boost users have the sysmain.dll file.Of the 0.1% of sysmain.dll users, less than 1% have disabled it.
How resource intensive is the loaded module sysmain.dll?
Comparison based on the average resource utilization across all programs.
                              0.29958913% CPU24965.8%
Average thread CPU utilization across all loaded modules is 0.00120%.
39 context switches/sec260.0%
Average context switches for all programs is 15 per second.
Typical file (disk image) location:
C:\Windows\System32\sysmain.dll

Are there other versions of Superfetch Service Host?

What else is related?

What Windows OS versions does this run on?

Windows 8.1 (6.2.9200.0)
Windows 8.1 Pro with Media Center (6.2.9200.0)
Windows 8.1 Single Language (6.2.9200.0)

About Microsoft Corporation

Microsoft, founded in 1975 by Bill Gates and Paul Allen, is a veteran software company, best known for its Microsoft Windows operating system and the Microsoft More...
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File details

File name: sysmain.dll
Publisher: Microsoft Corporation (verified)
Name: Superfetch Service Host
Description: Microsoft® Windows® Operating System
Version: 6.3.9600.16384 (winblue_rtm.130821-1623)
Product version: 6.3.9600.16384
Size: 1.14 MB
Original file name: sysmain.dll.mui
Windows file protection: Yes

Resource utilization

Total CPU: 0.2995891349%
Privileged CPU: 0.2775179126%
User CPU: 0.0220712224%
CPU Cycle count /sec: 6,036,532
Context switches /sec: 39
Module memory size: 1.15 MB

Autoplay handler details

Name: MSCreateRdbCache
Command: SOFTWARE\Microsoft\Windows\ CurrentVersion\Explorer\AutoplayHandlers\Handlers\MSCreateRdbCache

Hosted service details

Name: c78655bc80301d76ed4fef1c1ea40a7d
Command: SysMain

Scheduled task details

Name: WsSwapAssessmentTask
Command: \Microsoft\Windows\Sysmain\WsSwapAssessmentTask

Image hashes

MD5: 3da26652b12e9ab43fd04976ac6dfd33
SHA-1: 56395db35625d99463c8aea23d0b1eefbeeb692e

PE image details

Subsystem: Windows GUI
Langauge*: Microsoft Visual C++
File entropy: 6.27769
File packed: No
Import Table
advapi32.dll
api-ms-win-core-apiquery-l1-1-0.dll
api-ms-win-core-com-l1-1-0.dll
api-ms-win-core-datetime-l1-1-1.dll
api-ms-win-core-debug-l1-1-1.dll
api-ms-win-core-delayload-l1-1-1.dll
api-ms-win-core-errorhandling-l1-1-0.dll
api-ms-win-core-errorhandling-l1-1-1.dll
api-ms-win-core-file-l1-1-1.dll
api-ms-win-core-file-l1-2-0.dll
api-ms-win-core-file-l1-2-1.dll
api-ms-win-core-file-l2-1-0.dll
api-ms-win-core-file-l2-1-1.dll
api-ms-win-core-handle-l1-1-0.dll
api-ms-win-core-heap-l1-1-0.dll
api-ms-win-core-heap-l1-2-0.dll
api-ms-win-core-heap-obsolete-l1-1-0.dll
api-ms-win-core-interlocked-l1-1-0.dll
api-ms-win-core-interlocked-l1-1-1.dll
api-ms-win-core-interlocked-l1-2-0.dll
api-ms-win-core-io-l1-1-1.dll
api-ms-win-core-kernel32-legacy-l1-1-0.dll
api-ms-win-core-kernel32-legacy-l1-1-1.dll
api-ms-win-core-libraryloader-l1-1-1.dll
api-ms-win-core-libraryloader-l1-2-0.dll
api-ms-win-core-localization-l1-1-1.dll
api-ms-win-core-localization-l1-2-0.dll
api-ms-win-core-memory-l1-1-1.dll
api-ms-win-core-memory-l1-1-2.dll
api-ms-win-core-processenvironment-l1-1-0.dll
api-ms-win-core-processenvironment-l1-1-1.dll
api-ms-win-core-processenvironment-l1-2-0.dll
api-ms-win-core-processthreads-l1-1-1.dll
api-ms-win-core-processthreads-l1-1-2.dll
api-ms-win-core-profile-l1-1-0.dll
api-ms-win-core-psapi-l1-1-0.dll
api-ms-win-core-registry-l1-1-0.dll
api-ms-win-core-rtlsupport-l1-1-0.dll
api-ms-win-core-string-l1-1-0.dll
api-ms-win-core-string-l2-1-0.dll
api-ms-win-core-string-obsolete-l1-1-0.dll
api-ms-win-core-synch-l1-1-1.dll
api-ms-win-core-synch-l1-2-0.dll
api-ms-win-core-sysinfo-l1-1-1.dll
api-ms-win-core-sysinfo-l1-2-0.dll
api-ms-win-core-sysinfo-l1-2-1.dll
api-ms-win-core-threadpool-l1-2-0.dll
api-ms-win-core-timezone-l1-1-0.dll
api-ms-win-eventing-classicprovider-l1-1-0.dll
api-ms-win-eventing-consumer-l1-1-0.dll
api-ms-win-eventing-controller-l1-1-0.dll
api-ms-win-eventing-provider-l1-1-0.dll
api-ms-win-obsolete-kernelbase-l1-1-0.dll
api-ms-win-security-base-l1-1-0.dll
api-ms-win-security-base-l1-2-0.dll
api-ms-win-security-sddl-l1-1-0.dll
api-ms-win-service-core-l1-1-0.dll
api-ms-win-service-core-l1-1-1.dll
api-ms-win-service-management-l1-1-0.dll
api-ms-win-service-management-l2-1-0.dll
api-ms-win-service-winsvc-l1-1-0.dll
kernel32.dll
msvcrt.dll
ntdll.dll
ole32.dll
rpcrt4.dll
setupapi.dll
shell32.dll
shlwapi.dll
user32.dll
wtsapi32.dll
Export Table
agglload
agpdload
agtwload
closereadyboostperfdata
collectreadyboostperfdata
dllcanunloadnow
dllgetclassobject
dllregisterserver
dllunregisterserver
getproviderclassid
mi_main
openreadyboostperfdata
pfsvsysprepcleanup
pfsvunattendcallback
pfsvwsswapassessmenttask
rdbmgmtlaunchpropertiesw
sysmtservicemain
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