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10
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Instrumentation
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2. To use a specific visualizer object for a given class, which attribute should be used A. DebuggerDisplayAttribute B. DebuggerVisualizerAttribute C. DebuggerStepThroughAttribute D. Use the DebuggableAttribute
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Lesson 3: Monitoring Performance
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Lesson 3: Monitoring Performance
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No matter how well an application is designed, if it does not perform well it won t be well received by users. In fact, performance problems can sometimes be notably more problematic than traditional bugs because, unlike most bugs, performance problems are often quite difficult to correct. Here are some common performance problems:
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Slow or sluggish user interface (UI) responsiveness for example, frozen screens or application locks Slow or sluggish network access Slow or sluggish database connectivity, response time, or both Slow or sluggish file input/output
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Understanding how each of these areas works is critical to writing applications the perform well. However, once an application is deployed, life can get quite complicated. Assume that you wrote a Web application that did a lot of database access. Assume further that suddenly your company received a large influx of support calls complaining about performance. What would you do in response, and what would you tell your customers or your boss If you can t isolate the problem, you re going to have a hard time fixing it. You ll inevitably end up searching in some wrong directions, all the while wasting precious time. Fortunately, the System.Diagnostics namespace provides all the tools necessary to avoid this ineffective approach to problem solving.
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William Ryan A few years ago, I worked at a company where the software manager had utter disdain for most programmatic details. He hated database normalization. He hated object-oriented design. Basically, he hated any answer other than, Yes sir, that deadline won t be a problem. We did minimal testing as well (he hated testing too), but typically our applications performed well in our test cases. After our applications were deployed to customer sites, however, we d start having problems with both bugs and performance. The software manager s immediate answer to any performance problem was to buy more RAM. In one instance, we upgraded our application from 2 GB of RAM to 12 GB. This solution wasn t cheap. Unfortunately, the version of Microsoft SQL Server we were using supported only 2 GB of RAM those extra 10 GBs were a total waste as far as our application was concerned. So our manager insisted that we upgrade the SQL
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10
Instrumentation
Server version. Once the new SQL Server was running and using all 12 GB, there was a slight performance gain but it was still unacceptable to the client. Next our manager blamed the client s hardware: We ve got a Ferrari running on bicycle tires with this configuration. So he recommended the client get more hardware. At this point, the client already had spent over $20,000 more than they had planned, so they weren t budging on hardware. Our company, of course, had to absorb this additional cost. After the client had the new hardware in place, performance improved slightly but not enough to make a difference. Now the system was $40,000 over budget. Next our manager blamed the network configuration: we couldn t use 100-MB pipes any more; we needed 1-GB pipes. After spending another $4,000, we had 1 GB of network bandwidth, but once again there was not enough benefit to fix the poor performance. Left with nothing else to point a finger at, our manager finally blamed Microsoft. Windows 2000 Server and SQL Server 2000 were the problem. After all, things ran a lot faster on old green-screen applications, and with all that new hardware, how could it not be Microsoft s fault The real problems all along were as follows:
Bad data structures on the database (one of our tables had 255 columns and many others were close to this large) Excessive use of cursors, and cursors that were poorly written Single-threaded execution for everything
Had our manager bothered to diagnose the problem beforehand, a lot of time and money would have been saved. Had he bothered to diagnose the problem before finger-pointing, he might not have presided over a successful company s quick demise. The moral of the story: Before you start spending money or time fixing problems, make sure you thoroughly understand what the problems are.
After this lesson, you will be able to:
Enumerate processes. Use performance counters. Start processing. Use the StackTrace and StackFrame objects.
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