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update `Configuration-Settings.md` to describe these fields, you can do it in another followup PR","created_at":"2015-09-21T20:34:47Z","updated_at":"2015-09-21T20:34:47Z","html_url":"https://github.com/amplab/tachyon/pull/1563#discussion_r40022169","pull_request_url":"https://api.github.com/repos/amplab/tachyon/pulls/1563","_links":{"self":{"href":"https://api.github.com/repos/amplab/tachyon/pulls/comments/40022169"},"html":{"href":"https://github.com/amplab/tachyon/pull/1563#discussion_r40022169"},"pull_request":{"href":"https://api.github.com/repos/amplab/tachyon/pulls/1563"}}},"pull_request":{"url":"https://api.github.com/repos/amplab/tachyon/pulls/1563","id":45016271,"html_url":"https://github.com/amplab/tachyon/pull/1563","diff_url":"https://github.com/amplab/tachyon/pull/1563.diff","patch_url":"https://github.com/amplab/tachyon/pull/1563.patch","issue_url":"https://api.github.com/repos/amplab/tachyon/issues/1563","number":1563,"state":"open","locked":false,"title":"[TACHYON-334] 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result:\r\nconfiguration:\r\n1 master with 4 slaves\r\nTachyon tiered store config(per node):\r\n1st tier  MEM  50G (40% reserved space)\r\n2nd tier  HDD  100G * 4\r\n\r\nfor continous write, in our test, continously write 200G data into Tachyon, asynchrous eviction gets about 5% performance gain.\r\n\r\nfor burst write, in our test, write 100G * 4 times, asynchrous eviction gets about 20% performance gain, because async-eviction reserved some memory space and eviction happens earlier than 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