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Ready state (if not already
Running), this can never happen. Thus whenever the scheduler is called due to the current thread leaving its CPU, another thread can always be found to run on that CPU, even if it is only the CPU's idle thread. The CPU time attributed to the idle process is therefore indicative of the amount of CPU time that is
419:
The primary purpose of the idle process and its threads is to eliminate what would otherwise be a special case in the scheduler. Without the idle threads, there could be cases when no threads were runnable (or "Ready" in terms of
Windows scheduling states). Since the idle threads are always in a
435:) may make it appear to users that the idle process is monopolizing the CPU. However, the idle process does not use up computer resources (even when stated to be running at a high percent). Its CPU time "usage" is a measure of how much CPU time is not being used by other threads.
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There are more detailed sources of such information available through
Windows' performance monitoring system (accessible with the perfmon program), which includes more finely grained categorization of CPU usage. A limited
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The scheduler treats the idle threads as special cases in terms of thread scheduling priority. The idle threads are scheduled as if they each had a priority lower than can be set for any ordinary thread.
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which run when no other runnable thread can be scheduled on a CPU. In a multiprocessor system, there is one idle thread associated with each CPU core. For a system with
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arrives. Later versions of
Windows implement more complex CPU power saving methods. On these systems the idle thread will call routines in the
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power saving. The exact power saving scheme depends on the operating system version and on the hardware and
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showing System Idle
Process usage at 99%, indicating that no other process is using significant CPU time.
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Because of the idle process's function, its CPU time measurement (visible through, for example,
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In
Windows 2000 and later the threads in the System Idle Process are also used to implement
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instructions, which causes the CPU to turn off many internal components until an
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to reduce CPU clock speed or to implement other power-saving mechanisms.
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processors under
Windows 2000, the idle thread will run a loop of
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547:"What Is "System Idle Process," and Why Is It Using So Much CPU?"
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of the CPU time categorization is also accessible through the
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enabled, there is an idle thread for each logical processor.
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519:; David A. Solomon (2005). "Chapter 2: System Architecture".
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capabilities of the system in question. For instance, on
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needed or wanted by any other threads in the system.
565:"system idle process - What is system idle process?"
90:. Unsourced material may be challenged and removed.
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291:but its sources remain unclear because it lacks
16:Kernel process in Windows NT operating systems
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53:Learn how and when to remove these messages
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527:(4th ed.). Microsoft Press. pp.
340:Learn how and when to remove this message
322:Learn how and when to remove this message
252:Learn how and when to remove this message
150:Learn how and when to remove this message
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188:Please improve this article by adding
2211:Next-Generation Secure Computing Base
585:
484:List of Microsoft Windows components
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161:
88:adding citations to reliable sources
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18:
1340:Distributed Transaction Coordinator
13:
1671:User Interface Privilege Isolation
14:
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34:This article has multiple issues.
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1400:Remote Differential Compression
75:needs additional citations for
42:or discuss these issues on the
2256:Windows System Assessment Tool
1:
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190:secondary or tertiary sources
1545:Open XML Paper Specification
1405:Remote Installation Services
613:Microsoft Windows components
408:contains one or more kernel
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1697:Windows Subsystem for Linux
1656:Mandatory Integrity Control
1410:Windows Deployment Services
1207:Wireless Zero Configuration
523:Microsoft Windows Internals
477:
10:
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1799:Universal Windows Platform
1505:Kernel Transaction Manager
1490:Hardware Abstraction Layer
1187:Multimedia Class Scheduler
460:Hardware Abstraction Layer
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2251:Windows Services for UNIX
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1485:Graphics Device Interface
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994:Remote Desktop Connection
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1616:Security and Maintenance
1560:Security Account Manager
1154:Windows XP visual styles
277:This article includes a
2361:Windows NT architecture
2201:Media Control Interface
2035:Help and Support Center
1651:Kernel Patch Protection
1415:System Resource Manager
1395:Remote Desktop Services
1390:Print Services for UNIX
1172:Service Control Manager
782:Windows Error Reporting
702:DirectX Diagnostic Tool
404:operating systems, the
306:more precise citations.
2181:Desktop Cleanup Wizard
1757:COM Structured storage
1458:Desktop Window Manager
1350:Windows Media Services
569:www.processlibrary.com
177:relies excessively on
1809:Windows Mixed Reality
1480:Enhanced Write Filter
1330:Roaming user profiles
499:HLT (x86 instruction)
201:"System Idle Process"
99:"System Idle Process"
2090:Mobile Device Center
2040:Health & Fitness
1838:Solitaire Collection
1666:User Account Control
1661:Protected Media Path
1565:Server Message Block
1515:Logical Disk Manager
767:System Policy Editor
752:System Configuration
433:Windows Task Manager
365:Windows Task Manager
84:improve this article
2236:Virtual DOS machine
1580:System Idle Process
1555:Resource Protection
1463:Portable Executable
1355:Active DRM Services
757:System File Checker
727:Performance Monitor
406:System Idle Process
354:
353:System Idle Process
2241:Windows on Windows
1965:Backup and Restore
1777:Transaction Server
1495:I/O request packet
1335:Folder redirection
1004:Speech Recognition
762:System Information
717:Management Console
352:
279:list of references
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2231:Video for Windows
2186:Games for Windows
2055:Internet Explorer
1149:Windows Spotlight
792:Windows Installer
517:Russinovich, Mark
494:Microsoft Windows
456:interrupt request
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1631:Credential Guard
1310:Active Directory
1107:Indexing Service
737:Resource Monitor
732:Recovery Console
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2216:POSIX subsystem
2196:File Protection
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2140:Program Manager
2125:Phone Companion
2115:Outlook Express
2065:Make Compatible
1995:Desktop Gadgets
1955:Anytime Upgrade
1938:
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1814:Windows Runtime
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1646:Family features
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1385:DFS Replication
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1202:Error Reporting
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934:Mobility Center
929:Movies & TV
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807:Windows Insider
697:Driver Verifier
692:Drive Optimizer
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644:Booting process
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283:related reading
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2145:Steps Recorder
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1540:Object Manager
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1500:Imaging Format
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1127:Special folder
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802:Windows Update
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682:Device Manager
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672:Command Prompt
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414:hyperthreading
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287:external links
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2261:Windows To Go
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2130:Photo Gallery
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2075:Meeting Space
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2045:HyperTerminal
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2015:Easy Transfer
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1685:Compatibility
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1072:Action Center
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999:Snipping Tool
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857:Character Map
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677:Control Panel
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667:App Installer
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664:
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628:Architecture
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538:0-7356-1917-4
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203: –
202:
198:
197:Find sources:
191:
185:
184:
180:
175:This article
173:
169:
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154:
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143:
132:
129:
125:
122:
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111:
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104:
101: –
100:
96:
95:Find sources:
89:
85:
79:
78:
73:This article
71:
67:
62:
61:
56:
54:
47:
46:
41:
40:
35:
30:
21:
20:
2295:File Manager
2135:Photo Viewer
2070:Media Center
2030:Groove Music
1960:Address Book
1931:
1924:
1917:
1912:Purble Place
1910:
1903:
1896:
1889:
1882:
1877:Chess Titans
1875:
1868:
1855:Discontinued
1843:
1836:
1579:
1535:Ntoskrnl.exe
1443:Boot Manager
1435:Architecture
1325:Group Policy
1217:File systems
1117:Saved search
1024:Sticky Notes
989:Quick Assist
917:Media Player
887:Feedback Hub
882:Fax and Scan
777:Task Manager
707:Event Viewer
687:Disk Cleanup
572:. Retrieved
568:
554:. Retrieved
550:
522:
472:Task Manager
464:
437:
430:
426:
421:
418:
405:
399:
336:
318:
309:
298:Please help
290:
248:
239:
229:
222:
215:
208:
196:
176:
146:
137:
127:
120:
113:
106:
94:
82:Please help
77:verification
74:
50:
43:
37:
36:Please help
33:
2310:Minesweeper
2279:Spun off to
2100:MSN Dial-up
2095:Movie Maker
2000:Diagnostics
1950:ActiveMovie
1692:COMMAND.COM
1570:Shadow Copy
1425:Server Core
1265:Mount Point
1192:Shadow Copy
787:Windows Ink
551:How-To Geek
304:introducing
2290:DVD Player
2105:NetMeeting
2005:DriveSpace
1870:3D Pinball
1370:SharePoint
1134:Start menu
979:Phone Link
842:Calculator
797:PowerShell
658:Management
574:2022-01-13
556:2022-01-13
510:References
489:Idle (CPU)
402:Windows NT
369:Windows XP
212:newspapers
179:references
110:newspapers
39:improve it
2085:Messenger
2080:Messaging
2010:DVD Maker
1980:CD Player
1975:CardSpace
1926:Solitaire
1626:BitLocker
1621:AppLocker
1255:Hard link
1144:Task View
1122:Namespace
1092:ClearType
912:Messaging
897:Magnifier
862:Clipchamp
837:3D Viewer
312:July 2012
242:July 2012
140:July 2012
45:talk page
2355:Category
2329:Category
2206:MS-DOS 7
2191:ScanDisk
2110:NTBackup
1990:Contacts
1970:Cardfile
1905:Hold 'Em
1884:FreeCell
1730:VBScript
1641:Defender
1609:Security
1595:Winlogon
1550:Registry
1164:Services
1097:Explorer
1082:AutoPlay
969:Paint 3D
954:OneDrive
944:Narrator
892:Get Help
847:Calendar
742:Settings
712:IExpress
478:See also
444:firmware
2305:Mahjong
2226:Interix
2160:WinHelp
2060:Journal
2050:Imaging
1898:InkBall
1784:DirectX
1747:ActiveX
1735:JScript
1448:Console
1420:Hyper-V
1315:Domains
1139:Taskbar
1112:IFilter
1087:AutoRun
1049:WordPad
1044:Weather
959:OneNote
949:Notepad
872:Cortana
747:Sysprep
410:threads
300:improve
226:scholar
124:scholar
2338:
2327:
2300:Hover!
2174:Others
2155:Travel
2150:Syskey
1933:Tinker
1891:Hearts
1819:WinUSB
1804:WinAPI
1789:Native
1600:WinUSB
1525:MinWin
1302:Server
1102:Search
1014:Sports
984:Photos
974:People
852:Camera
535:
468:subset
394:Kernel
228:
221:
214:
207:
199:
126:
119:
112:
105:
97:
2266:WinFS
2165:Write
1862:Games
1829:Games
1702:WoW64
1530:NTLDR
1520:LSASS
1453:CSRSS
1260:links
1235:exFAT
1064:Shell
1029:Store
1019:Start
1009:Skype
964:Paint
939:Money
867:Clock
814:WinRE
722:Netsh
660:tools
649:Games
529:75–76
285:, or
233:JSTOR
219:books
131:JSTOR
117:books
2340:List
2221:HPFS
1985:Chat
1943:Apps
1845:Surf
1794:.NET
1762:DCOM
1590:WHEA
1585:USER
1575:SMSS
1365:WSUS
1345:MSMQ
1287:ReFS
1250:NTFS
1225:CDFS
1182:CLFS
1177:BITS
1077:Aero
1054:Xbox
1034:Tips
922:2022
907:Maps
902:Mail
877:Edge
829:Apps
624:APIs
533:ISBN
452:halt
390:Type
205:news
103:news
2120:Pay
2020:Fax
1767:OLE
1742:COM
1725:WSH
1712:API
1473:DLL
1468:EXE
1380:PWS
1360:IIS
1320:DNS
1292:UDF
1280:EFS
1275:TxF
1245:FAT
1240:IFS
1230:DFS
819:WMI
448:x86
440:CPU
422:not
400:In
367:in
181:to
86:by
2357::
637:NT
632:9x
567:.
549:.
531:.
289:,
281:,
192:.
48:.
605:e
598:t
591:v
577:.
559:.
541:.
343:)
337:(
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319:(
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310:(
296:.
255:)
249:(
244:)
240:(
230:·
223:·
216:·
209:·
186:.
153:)
147:(
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138:(
128:·
121:·
114:·
107:·
80:.
55:)
51:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
