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POPerformance-related: How does SQL Server process concurrent queries from multiple connections from a single .NET desktop application?
 

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    <p>Single-threaded version description:</p> <ol> <li>Program gathers a list of questions.<br></li> <li>For each question, get model answers, and run each one through a scoring module.</li> </ol> <hr> <ul> <li>Scoring module makes a number of (read-only) database queries.</li> <li>Serial processing, single database connection.</li> </ul> <p>I decided to multi-thread the above described program by splitting the question list into chunks and creating a thread for each one.</p> <p>Each thread opens it's own database connection and works on it's own list of questions (about 95 questions on each of 6 threads). The application waits for all threads to finish, then aggregates the results for display.</p> <p>To my surprise, the multi-threaded version ran in approximately the same time, taking about 16 seconds instead of 17.</p> <p><strong>Questions:</strong></p> <p>Why am I not seeing the kind of gain in performance I would expect from executing queries concurrently on separate threads with separate connections? Machine has 8 processors.</p> <p>Will SQL Server process queries concurrently when they are coming from a single application, or might it (or .net itself) be serializing them?</p> <p>Might there be something misconfigured, that would make it go faster, or might I just be pushing SQL Server to its computational limits?</p> <p><strong>Current configuration:</strong></p> <p>Microsoft SQL Server Developer Edition 9.0.1406 RTM<br> OS: Windows Server 2003 Standard<br> Processors: 8<br> RAM: 4GB</p>
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