我在阿里云的日子里，初测登陆和性能测试
阿里云给了一个IP和root的密码，非常简单，跟局域网上登陆一个服务器的感觉差不多，我用的xshell4来登陆，官方推荐Putty，看个人习惯。
1.CPU信息
# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU E5645 @ 2.40GHz
stepping : 2
cpu MHz : 2400.395
cache size : 12288 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush mmx fxsr sse sse2 ht syscall nx lm up rep_good unfair_spinlock pni ssse3 cx16
sse4_1 sse4_2 popcnt aes hypervisor lahf_lm
bogomips : 4800.79
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:2.内存信息
# free -m
total used free shared buffers cached
Mem: 489 398 90 0 0 325
-/+ buffers/cache: 72 416
Swap: 478 1 4773.分区信息
[root@AY121112061521fa89910 ~]# fdisk -lDisk /dev/xvda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 2550 20480000 83 Linux
/dev/xvda2 2550 2611 490496 82 Linux swap / Solaris
Disk /dev/xvdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/xvdb doesn't contain a valid partition table# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 20G 775M 19G 4% /
tmpfs 245M 0 245M 0% /dev/shm
系统才20G，明明买了40G，那20G去了哪里，其实仔细看一下就明白了，原来另外20G作为数据盘，并没有挂着到云系统里面，需要自己对数据盘进行格式化后，挂着到自己的云系统上
分区方法可参考 http://www.xumingxun.com/post/2012-10-27/40041512802
4.IO性能测试
# dd if=/dev/zero of=bigfile bs=1M count=500500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 19.8486 s, 26.4 MB/s
# dd if=/dev/zero of=bigfile bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 3.01808 s, 174 MB/s
下面那个数值是我的本本虚拟机跑的数值，阿里云果然IO存在问题，不过可以通过ramdisk技术来缓解 这一个状况
#cd /dev/shm
# dd if=/dev/zero of=bigfile bs=1M count=500
245+0 records in
244+0 records out
256016384 bytes (256 MB) copied, 0.141606 s, 1.8 GB/s
这是阿里云的ram下创建文件，1.8 GB/s 看来还是有点潜力
5.网速测试
[root@AY121112061521fa89910 data0]# wget http://nchc.dl.sourceforge.net/project/rigsofrods/rigsofrods/0.38/RoR-Setup-0.38.67.exe
--2012-11-14 13:37:40-- http://nchc.dl.sourceforge.net/project/rigsofrods/rigsofrods/0.38/RoR-Setup-0.38.67.exe
Resolving nchc.dl.sourceforge.net... 211.79.60.17, 2001:e10:ffff:1f02::17
Connecting to nchc.dl.sourceforge.net|211.79.60.17|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 139017086 (133M) [application/x-msdownload]
Saving to: “RoR-Setup-0.38.67.exe”
100%[=====================================================================>] 139,017,086 10.4M/s in 15s
2012-11-14 13:37:55 (8.73 MB/s) - “RoR-Setup-0.38.67.exe” saved [139017086/139017086]
高峰的时候，显示一度达到14M
同样的资源第二次测试，网速效果却不一样，看来是动态分配
wget http://nchc.dl.sourceforge.net/project/rigsofrods/rigsofrods/0.38/RoR-Setup-0.38.67.exe
--2012-11-14 13:42:22-- http://nchc.dl.sourceforge.net/project/rigsofrods/rigsofrods/0.38/RoR-Setup-0.38.67.exe
Resolving nchc.dl.sourceforge.net... 211.79.60.17, 2001:e10:ffff:1f02::17
Connecting to nchc.dl.sourceforge.net|211.79.60.17|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 139017086 (133M) [application/x-msdownload]
Saving to: “RoR-Setup-0.38.67.exe”
100%[=====================================================================>] 139,017,086 7.79M/s in 26s
2012-11-14 13:42:50 (5.01 MB/s) - “RoR-Setup-0.38.67.exe” saved [139017086/139017086]