top - 16:33:11 up 51 min, 1 user, load average: 0.00, 0.01, 0.02
Tasks: 46 total, 1 running, 45 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si,
KiB Mem: 508952 total, 380252 used, 128700 free, 320284 buffers
KiB Swap: 0 total, 0 used, 0 free, 26340 cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 10648 832 696 S 0.0 0.2 0:00.58 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
5 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0
6 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
7 root rt 0 0 0 0 S 0.0 0.0 0:00.02 watchdog/0
8 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cpuset
9 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs

root@zhujiceping:~# free -m
total used free shared buffers cached
Mem: 497 370 126 0 312 25
-/+ buffers/cache: 32 464
Swap: 0 0 0

root@zhujiceping:~# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Westmere E56xx/L56xx/X56xx (Nehalem-C)
stepping : 1
microcode : 0x1
cpu MHz : 2133.408
cache size : 4096 KB
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc up rep_good nopl pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor lahf_lm
bogomips : 4266.81
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

root@zhujiceping:~# df -lh
Filesystem Size Used Avail Use% Mounted on
rootfs 20G 671M 19G 4% /
udev 10M 0 10M 0% /dev
tmpfs 50M 124K 50M 1% /run
/dev/vda1 20G 671M 19G 4% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 100M 0 100M 0% /run/shm

root@zhujiceping:~# wget http://cachefly.cachefly.net/100mb.test
--2014-02-17 16:35:08-- http://cachefly.cachefly.net/100mb.test
Resolving cachefly.cachefly.net (cachefly.cachefly.net)... 205.234.175.175
Connecting to cachefly.cachefly.net (cachefly.cachefly.net)|205.234.175.175|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 104857600 (100M) [application/octet-stream]
Saving to: `100mb.test'

100%[================================>] 104,857,600 18.7M/s in 5.8s

2014-02-17 16:35:14 (17.1 MB/s) - `100mb.test' saved [104857600/104857600]

root@zhujiceping:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.36078 s, 455 MB/s

root@zhujiceping:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.40351 s, 447 MB/s

root@zhujiceping:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.15709 s, 498 MB/s

root@zhujiceping:~# wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash
CPU model : Westmere E56xx/L56xx/X56xx (Nehalem-C)
Number of cores : 1
CPU frequency : 2133.408 MHz
Total amount of ram : 497 MB
Total amount of swap : 0 MB
System uptime : 1 day, 21:55,
Download speed from CacheFly: 22.4MB/s
Download speed from Coloat, Atlanta GA: 1.66MB/s
Download speed from Softlayer, Dallas, TX: 984KB/s
Download speed from Linode, Tokyo, JP: 593KB/s
Download speed from i3d.net, Rotterdam, NL: 387KB/s
Download speed from Leaseweb, Haarlem, NL: 440KB/s
Download speed from Softlayer, Singapore: 537KB/s
Download speed from Softlayer, Seattle, WA: 1.35MB/s
Download speed from Softlayer, San Jose, CA: 2.96MB/s
Download speed from Softlayer, Washington, DC: 1.78MB/s
I/O speed : 299 MB/s

蛋疼，多DD，DD好就JJ好：
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.62604 s, 409 MB/s
root@zhujiceping:~/lnmpv#
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.89242 s, 371 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.12581 s, 505 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.14257 s, 501 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.19224 s, 490 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.12637 s, 505 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.16788 s, 495 MB/s
root@zhujiceping:~/lnmpv# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.1569 s, 498 MB/s