??????4????????????
???????????iperf???????????????????????Mbps????????????????????????????iperf???????????????????????iperf?????????????з????????????IP?????192.168.1.1?????п????????????IP?????192.168.1.2??
?????????????????????
????iperf -s
?????????????????????
????iperf -c 192.168.1.1
??????????????????????????????????????????
?????????????????ο????????????????????????????????????????????????????Intel Core i3 540 @ 3.07 GHz ?????????????16 GB??棨DDR3 @ 1333 MHz???????Seagate ST2000DL003-9VT1????SATA??2TB??5900RPM????????Ubuntu 10.04 AMD64 Server??????????????????ext4??????Hypervisor?KVM??qemu-kvm-0.12.3?????????????????????????????????????????????????????????????????????????????2 ??vCPU?????????????????????????????????4 GB??檔????????????2 ??vCPU?????????????????????????????????4 GB??棬????Ubuntu 12.04 AMD64 Server?????????????????????ж???????????????NFS??KVM???????κ??????????????????????????????virtio??

????????????????????????????????????????????????????????????????????virtio??????￡???????????????????????????С????????????????????????????????????????????????????????????????н??15%??????????????????????????????
??????5??????????????
????postgresql????????????????????MySQL??Sun ???????????????Oracle???????????????????????MySQL????postgresql??pgbench????????postgresql?????????????????????????TPC-B??pgbench???????????????????????ж????????????????????????????????????
???????????????postgres????????
????su -l postgres
??????/usr/lib/postgresql/9.1/bin????·??PATH???С?
?????????????????
????createdb pgbench
??????????????????
????pgbench -i -s 16 pgbench
??????е????????
????pgbench -t 2000 -c 16 -U postgres pgbench
??????ж????????????????????н?N?滻????????vCPU??????
????pgbench -t 2000 -c 16 -j N -U postgres pgbench
?????????????????ο????????????????????????????????????????????????????Intel Core i3 540 @ 3.07 GHz ?????????????16 GB??棨DDR3 @ 1333 MHz???????Seagate ST2000DL003-9VT1????SATA??2TB??5900RPM????????Ubuntu 10.04 AMD64 Server??????????????????ext4??????Hypervisor?KVM??qemu-kvm-0.12.3?????????????Ubuntu 12.04 AMD64 Server????????????????????????????????????????????RAW????????????virtio???洢???????????????????????????????????RAW????????????virtio???洢??NFS????????????????????????????????2 ??vCPU?????????????????????????????????4 GB??棬????Ubuntu 12.04 AMD64 Server?????????????????????ж???????????????NFS??KVM???????κ?????????

????????????????????????????н????κ?????????????￡??????????????棬?????? >> ??????????????? >> NFS??????????????