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I am using MongDB 2.4.9 and working on performance tunung. With reference to the ulimit settings for mongodb, in my linux environment (ubuntu 12.04) the default setting for ulimit -s is 8192. MongoDB does not specify any default value for ulimit -s (stack-size). However this case study suggests to set stack-size to 1024. How does the default stack-size 8291 impacts mongodb performance. Does changing this value to 1024 help to reduce connection per overhead in order to improve performance?

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The default stack size for MongoDB is already 1024, not 8192 (it is set in the code, not as a system setting) and has been since version 1.8.3 (see SERVER-2707), so you are already seeing the benefits of a lower stack size.

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