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Disable all histogram and stop_watch usage

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@matthewvon matthewvon released this 08 Jan 14:42
· 2364 commits to stardog/develop since this release
6eda27a
  1. not all histograms will disable in this version 5.18. That creates a performance degradation if user supplies a statistics object.

  2. the stop_watch object used in merge_helper is always calling the clock, even with statistics disabled.

Both changes are hacked into the code. The first will be fixed properly when we upgrade to rocksdb 6.x. The second requires a PR to facebook which I will create shortly.