IBM Dynamic Application Virtualization
A technology that enables computationally-intensive applications to take advantage of accelerated libraries on remote, back-end systems (including Cell Broadband Engine), reducing time to deployment and disruption to business.
Date Posted: September 27, 2007
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The User Guide is located on the Requirements tab of this alphaWorks® Web page. | | |
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In order to run the Tooling, the Client is also required; however, the IBM Dynamic Application Virtualization-enabled client application can be executed on a machine with only the Client installed.
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The log file's location can be configured in the IBM_DAV.conf file using the following parameters: dav.log.directory and dav.log.filename. | | |
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Under the IBM Dynamic Application Virtualization Client installation area; this area is, by default as follows:
- Windows: C:\Program Files\IBM\IBM DAV Tooling\davGen
- Linux: /usr/davtooling/davGen
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The default location is as follows:
- Windows: C:\Program Files\IBM\DAV\IBM_DAV.conf
- Linux: /usr/davclient/IBM_DAV.conf
Otherwise, the file can be found in the user-selected installation location for the IBM Dynamic Application Virtualization Client.
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Semantic input is used to provide size information for array or pointer function parameters to the IBM Dynamic Application Virtualization Tooling stub generator.
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Compilation errors or unexpected behavior may occur. To avoid these errors, the semantic verifier should be used to test semantics locally, before deployment to the grid.
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This phrase means that the client application is rebuilt using the IBM Dynamic Application Virtualization Tooling-generated stub libs. This rebuilding allows the client to connect to the IBM Dynamic Application Virtualization Service running on the remote server. | | |
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The IBM Dynamic Application Virtualization Tooling process must be repeated. | | |
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No; please use a different port for each new service. | | |
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Yes, if different services have been specified in the IBM_DAV.conf file. You merely need call the following: ./dav start
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Use the following: ./dav stop
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Yes, using the following: ./davServiceBroker
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Use the following: ./davServiceBroker –s | | |
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Yes, the port for the client and service interface must be defined in the IBM_DAV.conf file, as follows:
dav.broker.listen.services.port=4321
dav.broker.listen.clients.port=4320
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The log file's location can be configured in the IBM_DAV.conf file using the following parameters: dav.log.directory and dav.log.filename. | | |
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$IBM_DAV_PATH/IBM_DAV.conf | | |
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./dav will look for the IBM_DAV.conf in the current directory and under the $IBM-DAV_PATH. | | |
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By default, they are expected to be in $IBM_DAV_PATH/bin. The location can be configured. | | |
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Yes. | | |
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The automatic deployment tool requires that the IBM_DAV_PATH environment variable be set for the required users. | | |
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Currently it supports only two-dimensional arrays. | | |
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Yes. Server-side memory allocation can be specified by using @param[out] in the semantics. | | |
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Not currently. | | |
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One level is supported. | | |
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The new service will not start. A different port must be taken. | | |
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In C, chars are 8-bit, unsigned integers, and IBM Dynamic Application Virtualization maps chars to bytes in Java. Because bytes in Java are 8-bit signed integers, when the result comes back, DAV returns the correct value to the Java client and Java then interprets the number as a signed number. This is the reason for the incorrect result.
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Yes. A VBA function call to the relevant IBM Dynamic Application Virtualization stub lib should be created.
For VBA-to-C-type mapping, please see How to Access DLLs in Excel.
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LD_LIBRARY_PATH must be exported to $IBM_DAV_PATH/lib:. | | |
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Yes, you merely need set in the IBM_DAV.conf file the following setting:
dav.broker.listen.services.ip=127.0.0.1 | | |
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This number determines how many requests the service broker will allow to run simultaneously on the same node. It must be defined in the IBM_DAV.conf file of the execution node.
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No. The @library semantic tag can be used to specify an alternate name. | | |
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Yes, if they are on different nodes. | | |
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Logs are generated only if errors occur during code generation. The log file can be found in the client directory of the generated code. | | |
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This is the sample user list file included for automatic deployment. The first line of this file refers to the build machine (that is, where the *_oai.so library is built). The second and subsequent lines refer to the deployment (that is, where the libraries are deployed). | | |
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No. They can be started by any user, but they must be stopped by the same user. | | |
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When yourLibName_stub.dll is generated through DavGen from the C header file, it automatically prepares VBA equivalent function stubs. The VBA functions are denoted with the same name as their C/Java counterpart, but with a trailing _VBA.
From your spreadsheet, declare the individual functions you wish to use from the dll. This declaration references the Lib yourLibName_stub.dll (which must be in your PATH), gives the DLL internal function name (such as calculate_Array_VBA) as an alias, and specifies the parameters in their VBA equivalents: ByRef for arrays and pointers, ByVal for values, As Long for C int, As Byte for C Char, etc. This is shown in Module 1 in the included sample:
Declare Function Library_calculate_remote Lib "Library_stub.dll" Alias "calculate_Array_VBA"
(ByRef array1 As Double, ByRef array2 As Double, ByVal value As Long) As Double
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The name used to declare the function is the one used to invoke the function from elsewhere in the spreadsheet:
Dim result As Double
result = Library_calculate_remote( array1(0), array2(0), arraySize )
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