1ms pacing timer tick for experimental
1ms pacing timer tick for experimental

Summary: This is potentially a better min interval for the TokenlessPacer, as event loops can often take > 200us.

Reviewed By: yangchi

Differential Revision: D24123176

fbshipit-source-id: 21b023925d331b196676a71a3a2eb3bc8e62df6c

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