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If a dump file was requested at process exit, the first section contains a summary of the information in the dump file Virtual Memory Analysis: This section contains information on the virtual memory activity in the process being analyzed The section includes information such as virtual memory details, loaded modules, and threads Heap Analysis: The Heap Analysis section contains a top-level overview of heap usage, as well as a detailed breakdown of heap statistics for each heap Leak Analysis: The Leak Analysis section contains the result of the leak analysis performed by DebugDiag It shows a top-level overview of memory activity, as well as individual heap activity broken down by module
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Let s take a look at the Leak Analysis section of the sample application we just ran The first part of interest is the overview section, as shown in Figure 142
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Figure 142 As you can see from Figure 142, 09BasicMLeakexe is the module that serves as our biggest allocation hog, with a total of 36,000 allocations and 98438KB total memory This information allows us to quickly get the information we need in order to focus
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our troubleshooting efforts in the correct code location Following the overview section is a detailed drilldown into each module s activity Because we already know, from the overview section, that 09BasicMLeakexe seems suspect, we begin by looking at the 09BasicMLeakexe module section illustrated in Figure 143
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Figure 143 The Module section begins with a summary of the module information, such as image name, module name, module size, and much more Following the module summary is a breakdown of the functions in the module with the biggest allocation activity In our case, we can see that the GetSID function is responsible for both the largest allocation count and allocation size The final piece of information is the Function Details section, which details the top allocation functions and gives a breakdown of the different allocations made in the function For example, Figure 143 shows that the GetSID function was responsible for 36,000 allocations of size 28 bytes each As you have seen, DebugDiag offers truly amazing analysis capabilities that relieve the developer from having to manually perform costly debug steps Additionally, DebugDiag shows the outcome of the analysis in an easy-to-read and
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digestible form Two other rules are available: crash and hang analysis rules We strongly encourage you to look into these rules, as they provide information similar to that of the memory and handle leak rules Both of these rules are backed by powerful analysis scripts The big question, however, is can this tool be extended and new custom analysis scripts be developed for scenarios that the existing scripts do not cover The answer is yes, and it involves using the extensibility model of the tool, which we look at next
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In addition to providing exciting and powerful analysis scripts out of the box, DebugDiag also exposes powerful scripting access with a rich object model that enables developers to write their own analysis scripts using their favorite scripting language (such as VBScript or JScript) The object model is very extensive and covers a great majority of debugging objects that a developer might need To get more detailed information on the complete object model, see the DebugDiag documentation In this part of the chapter, we illustrate how the scripting capabilities can be used to write your own analysis script that outputs all the locked critical sections in a dump file Each script begins with a metadata section that tells the analysis engine the script language used and its category, as well as a description The metadata section looks very much like an ASP header, as illustrated in Listing 141 Listing 141
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<%@ Language = VBScript %> <%@ Category = Sample analysis script %> <%@ Description = Example of a custom analysis script %> <% script code goes here %>
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