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Table Of Contents
ThinApp User’s Guide
42 VMware, Inc.
Using ThinApp Packages Streamed from the Network
Anynetworkstoragedevicecanserveasastreamingserverforhundredsorthousandsofclientcomputers.
SeeFigure 31.
Figure 3-1. Data Block Streaming over a Network Share
Ontheenduserdesktop,youcancreateshortcutsthatpointtothecentrallyhostedexecutablefilepackages.
Whentheuserclickstheshortcut,theapplicationbeginsstreamingtotheclientcomputer.Duringtheinitial
streamingstartupprocess,theThinAppstatusbarinformstheuseroftheprogress.
How ThinApp Application Streaming Works
WhenyouplacecompressedThinAppexecutablefilesonanetworkshareorUSBflashdrive,thecontents
fromtheexecutablefilestreamtoclientcomputersinablockbasedfashion.Asanapplicationrequestsspecific
partsofdatafiles,ThinAppreadsthisinformationinthecompressedformatoverthenetworkusing
standard
Windowsfilesharingprotocol.Foraviewoftheprocess,seeFigure 32.
Afteraclientcomputerreceivesdata,ThinAppdecompress esthedatadirectlytomemory.BecauseThinAppdoes
notwrite datatothedisk,theprocessisfast.Alargepackagedoesnotnecessarilytakealongtime
toloadover
thenetworkandthepackagesizedoesnotaffectthestartuptimeofanapplication.Ifyouaddanextra20GB
filetoapackagethatisnotinuseatruntime,thepackageloadsatthesamespeed.Iftheapplicationopensand
reads32KBofdata
fromthe20GBfile,ThinApponlyrequests32KBofdata.
TheThinAppruntimeclientisasmallpartoftheexecutablefilepackage.WhenThinApploadstheruntime
client,itsetsuptheenvironmentandstartsthetargetexecutablefile.Thetargetexecutablefileaccessesother
partsoftheapplicationstored
inthevirtualoperatingsystem.Theruntimeclientinterceptssuchrequestsand
servesthembyloadingDLLsfromthevirtualoperatingsystem.
Theloadtimeoftheruntimeclientacrossanetworkisafewmilliseconds.AfterThinApploadstheruntime
clienttomemoryontheclientcomputer ,theenduser
computercalculateswhichblocksofdataarerequired
fromtheserverandreadsthembasedonapplicationactivity.
Whentheapplicationmakessubsequentreadrequestsforthesamedata,theWindowsdiskcacheprovides
datawithoutrequiringanetworkreadoperation.Iftheclientcomputerrunslowonmemory,Windows
discards
someofitsdiskcacheandprovidesthememoryresourcetootherapplications.
Sam’s
Sandbox
Joe’s
Sandbox
Jill’s
Sandbox
shared folder