????3.2??????
?????????????????????????????????????????????????????е??????????????????????汾??????￡?
????3.2.1 Dell PowerEdge R520 and R720 (used as server)
????????????OS??: Red Hat Enterprise Linux Server 6.4
?????????Architecture??: x86_64
????????Kernel??: 2.6.32
????Apache Cassandra: 2.1.2
????MongoDB: 2.6.5
????SequoiaDB: 1.8
????YCSB: 0.1.4 master (brianfrankcooper version at Github) with bankmark changes (see 4.1)
????3.2.2 HP ProLiant BL465c (used as client)
????????????OS??: SUSE Linux Enterprise Server 11
?????????Architecture??: x86_64
????????Kernel??: 3.0.13
????YCSB: 0.1.4 master (brianfrankcooper version at Github) with bankmark changes (see 4.1)
????4.???????
??????????????????YCSB???л????????????Apache Cassandra??MongoDB ??? SequoiaDB???????????????????????????????????????????е???????????3?鴟?????3?鯔??????????????????????д???????????С?
????4.1?????????
????????????ò??????????????????????
????vm.swappiness = 0
????vm.dirty_ratio = 100
????vm.dirty_background_ratio = 40
????vm.dirty_expire_centisecs = 3000
????vm.vfs_cache_pressure = 200
????vm.min_free_kbytes = 3949963
????4.2 APACHE CASSANDRA
????Apache Cassandra?????з?????????????????[4]???а??????????????????????????[5] ???С?????????????????????????д洢??disk1 ?洢?????????disk5??disk6 ?洢???????
????4.3 MONGODB
????MongoDB??????????????????????????????????????????????и????飬?????????????й???????????[6]???????????????????3??????????????????÷?????????????????????????mongos??????????????????????????????????????????????С?????????????????????????????????10????????????????±??????????? ?????????

????MongoDB??????????????????????????????????10???????????????????д????YCSB??????С?
????4.4 SEQUOIADB
????SequoiaDB????????????????????????а??[7]????????e????????????й????????????[8]???????С?SequoiaDB???????????????????????????е????????????? “sdbcm”????????????з????????????????????catalog?????????????SequoiaDB???????????????????????????????
????4.5 YCSB
????YCSB??????д????Щ????????????????????????????YCSB??????е?????????????????????????????????к??OPS????? ????YCSB??????????·???bankmark??????Щ?????????????е?YCSB 0??1??14?汾 ????????????Щ?????????????????￡?
????????????????????
????Cassandra??jbellis????
????MongoDB??achille????
?????????????????SequoiaDB????
??????????MongoDB 2_12??????????????????flag??????????????????е?”???????“??????
????SequoiaDB????
???????????????????????????????Щ???