Changes between Version 18 and Version 19 of TmixDetails


Ignore:
Timestamp:
10/19/12 12:43:55 (12 years ago)
Author:
Ben Newton
Comment:

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  • TmixDetails

    v18 v19  
    77Rather than modeling the individual packets or TCP segments, Tmix instead uses inferences to characterize connections as a sequence of request-response exchanges between "''a''" and "''b''".  Each request or response transfers one application-data unit (ADU), which is a generic term for the object or protocol element being transferred.   Further, each exchange (request then response) is called an epoch, and includes the sizes of the ADUs transferred, and the requester side "think" or processing time, "''t''". 
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    9 [[Image(TmixImages:tmixConnection.png, 450, right)]] More formally, a simulation would consist of a set of ''n'' connection vectors ''C'',,1...''n'',,, starting at times ''T'',,1...''n'',,.  Each connection vector includes a set of ''k'' epochs, ''C'',,''i'',,=<''E'',,1,,,''E'',,2,,,..., ''E'',,k,,>, where each epoch is defined by ''E,,i,,'' = (''a,,i,,'',''b,,i,,'',''t,,i,,''). Each epoch includes ''a'',,''i'',,, the size of the ''i ''^th^ ADU sent from the connection initiator to the connection acceptor, ''b,,i,,'', the size of the ''i ''^th^ ADU sent from the connection acceptor to the connection initiator, and ''t,,i,,'', the "think" or processing time between the receipt of the ''i ''^th^ "response" ADU and the transmission of the (''i''+1)^st^ "request".  Note that Tmix does not require the any information from application layer headers. 
     9[[Image(TmixImages:tmixConnection.png, 450, right)]] More formally, a simulation would consist of a set of ''n'' connection vectors ''C'',,1...''n'',,, starting at times ''T'',,1...''n'',,.  Each connection vector includes a set of ''k'' epochs, ''C'',,''i'',,=<''E'',,1,,,''E'',,2,,,..., ''E'',,k,,>, where each epoch is defined by ''E,,i,,'' = (''a,,i,,'',''b,,i,,'',''t,,i,,''). Each epoch includes ''a'',,''i'',,, the size of the ''i ''^th^ ADU sent from the connection initiator to the connection acceptor, ''b,,i,,'', the size of the ''i ''^th^ ADU sent from the connection acceptor to the connection initiator, and ''t,,i,,'', the "think" or processing time between the receipt of the ''i ''^th^ "response" ADU and the transmission of the (''i''+1)^st^ "request".  The figure to the right shows a connection that includes three epochs, with the important features of the a-b-t model labeled.  Note that Tmix does not require the any information from application layer headers. 
    1010
    1111== Workload Generation ==