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* WT-2898. NOT ready for review. Initial implementation of dynamically tuning the number of eviction workers.
* Not ready for review. All the code is there. Still need to test/tune on different machines.
* Remove debugging prints.
* Style police
* Spelling.
* Fixup merge issue and compiler warning
* Sulab and David do a review!
* Fix compiler warning. Not ready for review. There is a performance regression after merging with develop. I'm on it.
* Conversion to signed values in percent calculation to make sure that we always correctly compute percent difference, which can be negative, regardless of how the complier performs sign extension. Change thresholds so we have less churn.
* Fix more compiler warnnings. Sorry about the churn, I don't see the same failures locally as on the autobuild even though I compile with -Werror.
* Replace 1/0 with true/false
* More compiler warning and style fixes. Configured with --enable-strict, so hopefully I have caught everything this time.
* Minor nit/pick, init a variable
* Rename free to free_thread, otherwise hides a global
* Fix indentation
* Fixes to the changes. Percent difference must be signed as it can be negative if the number of pages evicted per second decreased since the last period.
* Added stats and log messages to reflect eviction worker tuning activity. Fixed a bug in the code that checks the group bounds when stopping the thread.
* Removed verbose message, because we already have a statistic tracking evictions per second, so this is probably redundant.
* whitespace
* KNF
* More aggressive addition/removal of eviction workers. We used to add/remove them one at a time; it's difficult to see the effects of extra workers with such an incremental change, because eviction throughput is affected by other noise, such as what happens in the kernel and in the I/O system. Now we add and remove eviction workers in batches.
* Style fixes.
* Fix compiler warning.
* Simplified the tuning logic. Addressed Sulabh's comments.
* A tuning parameter change
* Fixed a bug where we needed a random value, but were not getting it via the random number generator, so it was not random and the code did not have the right behaviour. Added stats.
* Move the call to tune evict workers into __evict_pass, so we can begin the tuning earlier.
* NOT READY FOR REVIEW. Changed defaults for the number of eviction workers, so I can experiment with larger values.
* NOT READY FOR REVIEW. A parameter to put a cap on how many threads we are adding at a time.
* Reverse the changes of the last commit. That change hurt performance.
* Changed all wtperf runners that set eviction thread maximum to 30, so we could evaluate the effects of the dynamic branch.
* Updated the number reserved for internal sessions to 40, since we can now create up to 30 eviction worker threads by default.
* Fix spellchecker complaints
* KNF
* NOT READY FOR REVIEW. Revised the algorithm to settle on a good value of evict workers once we sufficiently explore the configuration space using the gradient descent approach with random adjustments. The algorithm successfully finds the best static number of workers, but performs works. I suspect that there is an issue with how threads are removed. Suspect a bug in thread support code. Have not chased it yet.
* Remove prints, add stats.
* Fix a copy-paste bug where a code line was inadvertently eliminated.
* Reduce the maximum for eviction workers to 30. Prevent dereferencing a NULL pointer if we dynamically grow a thread group after we've shrunk it and freed the associated memory.
* Cleaned up and simplified the code.
* NOT READY FOR REVIEW. A new version of the tuning algorithm that fixes a memory issue when we try to pre-allocate a large eviction thread group. Still need to tune and clean up the code.
* Clean up the code.
* Get rid of s_label warnings. Remove unused code.
* Fix various style errors.
* Fixed the logic in figuring out the maximum value for eviction threads upon cache creation or reconfiguration, which had caused a crash in one of the tests.
* Changed default max for the number of eviction threads to eight.
* Fix ranges for the minimum number of eviction threads
* Fix eviction thread ranges to make the csuite happy
* Commit automatic changes by s_all
* Review: KNF, whitespace and renamed a few things.
* Fix lock usage
* KNF
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