Re: Inexplicable slowdowns

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Luke Zhang [MSFT] wrote:
Hello,

What is the task of the particular thread? What code it will execute? If you have source code on hand, you may add some debug code in it, for example, log exact time in a file after each of steps has been finished, so that you can know which code cause the delay.

The task is to basically schedule an entity into a time slot. So the tasks has to consider hundreds of business rules and find a time slot. The operation is totally memory based (and can take a bit of time). At the end of the operation, the results are written to the database. However, I profiled the SQL operation and it is taking no time at all.

I also noticed that the server was operating at the end of available physical memory (typically 200 mb free out of total of 6GB available) and as a result of perfmon monitoring, I saw that these slowdowns occur when the available physical memory dips to 100mb or so. I am thinking that the operation is forced into the paging file/virtual memory. However, I still can't explain the magnitude of the slowdown, e.g. operation that normally takes a second will take 80 seconds.

Regards



Sincerely,

Luke Zhang

Microsoft Online Community Support
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