Some built-in stats #24
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…read keeps a count of its own attempts, then reports them before exiting via an atomic fetch and add. Can be turned off with -D NO_STATS, but should be on by default, because the counter increment is negligable; it will not meaningfully impact performance. Also, actually uses CFLAGS when building (the default build was NOT actually invoking -O3).
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Added wall-time measurement that measures ops/sec. Basically, each thread keeps a count of its own attempts, then reports them before exiting via an atomic fetch and add. Can be turned off with -D NO_STATS, but should be on by default, because the counter increment is negligable; it will not meaningfully impact performance. Also, actually uses CFLAGS when building (the default build was NOT actually invoking -O3).