likwid工具尝鲜

likwid: like I knew what I am doing.

是一系列工具的集合，用于针对多线程程序的指标分析，方便程序员进行性能调优工作。可以深入到控制cpu等硬件的频率。

主要包括以下小工具:

likwid-topology: Show the thread and cache topology
likwid-perfctr: Measure hardware performance counters on Intel and AMD processors
likwid-features: Show and Toggle hardware prefetch control bits on Intel Core 2 processors
likwid-pin: Pin your threaded application without touching your code (supports pthreads, Intel OpenMP and gcc OpenMP)
likwid-bench: Benchmarking framework allowing rapid prototyping of threaded assembly kernels
likwid-mpirun: Script enabling simple and flexible pinning of MPI and MPI/threaded hybrid applications
likwid-perfscope: Frontend for likwid-perfctr timeline mode. Allows live plotting of performance metrics.
likwid-powermeter: Tool for accessing RAPL counters and query Turbo mode steps on Intel processor.
likwid-memsweeper: Tool to cleanup ccNUMA memory domains and force eviction of dirty cachelines from caches.
likwid-setFrequencies: Tool to set specific processor frequencies.

使用案例：

likwid-topology
-------------------------------------------------------------
CPU type:    Intel Core IvyBridge processor
*************************************************************
Hardware Thread Topology
*************************************************************
Sockets:
Cores per socket:
Threads per core:
-------------------------------------------------------------
HWThread    Thread        Core        Socket

-------------------------------------------------------------
Socket : (  )
Socket : (  )
Socket : (  )
Socket : (  )
-------------------------------------------------------------

*************************************************************
Cache Topology
*************************************************************
Level:
Size:     kB
Cache groups:    (  ) (  ) (  ) (  )
-------------------------------------------------------------
Level:
Size:     kB
Cache groups:    (  ) (  ) (  ) (  )
-------------------------------------------------------------
Level:
Size:     MB
Cache groups:    (  ) (  ) (  ) (  )
-------------------------------------------------------------

*************************************************************
NUMA Topology
*************************************************************
NUMA domains:
-------------------------------------------------------------
Domain :
Processors:
Relative distance to nodes:
Memory: 1132.52 MB free of total 8191.43 MB
-------------------------------------------------------------

download: http://ftp.fau.de/pub/likwid/

1. http://ftp.fau.de/pub/likwid/likwid-stable.tar.gz

2. http://files.cnblogs.com/files/ToDoToTry/likwid-stable.tar.gz