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OTP-12376
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Effects if sizeof(erts_smp_rwmtx_t) > 64:
+ Better performance due to less false sharing
- Increased memory footprint per table
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Make it possible to change the number of write_concurrency locks to use. This
is usefull to change when you for some reason want to use more/less locks
per write_concurrency ets table. eg. OSs with a limit on how many mutexes
can exist at once.
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Add an extra pointer to start of segment with the active segment table
to get rid of PossiblyLost errors without the need of a too general
suppression that may hide real memory leaks in ETS.
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