Performance tuning

Warning: This section of the manual is yet work in progress. For the moment, just a list of topics that should be covered in the final document:

• Mongo 3.0 suitability
• The different notificationModes and their impact on performance
• Setting connection memory limit
• Using thread pools (both notifications and MHD) and its suitability, taking into account the OS per-process limit. Drawbacks (queue/connection saturation)
• Changing the thread limit per process (ulimit). The "thread cannot be created error"
• Identifying bootlenecks looking at sem statistics
• Logging impact on performance
• Mutex policy impact on performance
• Write concern impact on performance
• httpTimeout impact on performance
• subCacheIval impact on performance (tradeoff between "too frequent" and "too infrequent")
• Any other?