虚拟机的优化
# lscpuArchitecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 60
Stepping: 3
CPU MHz: 800.000
BogoMIPS: 5188.22
Virtualization: VT-x
L1d cache: 32K＃一级缓存分为数据和指今缓存
L1i cache: 32K#一级缓存是静怸内存
L2 cache: 256K＃二级缓存是共享的（一个CPU中的多个核共享）
L3 cache: 3072K＃二三是高速的动态内存
NUMA node0 CPU(s): 0-3
# lscpu -p
# The following is the parsable format, which can be fed to other
# programs. Each different item in every column has an unique ID
# starting from zero.
# CPU,Core,Socket,Node,,L1d,L1i,L2,L3
0,0,0,0,,0,0,0,0
1,0,0,0,,0,0,0,0
2,1,0,0,,1,1,1,0
3,1,0,0,,1,1,1,0
把QEMU进程绑定在CPU上，减少缓存丢失的情况
# taskset --help
taskset (util-linux-ng 2.17.2)
usage: taskset ]
set or get the affinity of a process
-p, --pid operate on existing given pid
-c, --cpu-list display and specify cpus in list format
-h, --help display this help
-V, --version output version information
The default behavior is to run a new command:
taskset 03 sshd -b 1024
You can retrieve the mask of an existing task:
taskset -p 700
Or set it:
taskset -p 03 700
List format uses a comma-separated list instead of a mask:
taskset -pc 0,3,7-11 700
Ranges in list format can take a stride argument:
e.g. 0-31:2 is equivalent to mask 0x55555555
DMA 直接内存访问
大页内存
# cat /proc/sys/vm/swappiness
60
IO的调度算法;
# cat /sys/block/sda/queue/scheduler
noop anticipatory deadline
默认的是cfq(保证每个进程的IO都比效平均)
deadline:主要用于CPU（如果是数据库的调优的诚征最好是用这种方法）
noop：是没有做何的算法（用SSD的硬盘话 就必需要用这个）
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