likwid工具嚐鮮

likwid: like I knew what I am doing.

是一系列工具的集合，用於針對多線程程序的指標分析，方便程序員進行性能調優工做。能夠深刻到控制cpu等硬件的頻率。

主要包括如下小工具:

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:    4 
Cores per socket:    1 
Threads per core:    1 
-------------------------------------------------------------
HWThread    Thread        Core        Socket
0        0        0        0
1        0        0        2
2        0        0        4
3        0        0        6
-------------------------------------------------------------
Socket 0: ( 0 )
Socket 2: ( 1 )
Socket 4: ( 2 )
Socket 6: ( 3 )
-------------------------------------------------------------

*************************************************************
Cache Topology
*************************************************************
Level:    1
Size:    32 kB
Cache groups:    ( 0 ) ( 1 ) ( 2 ) ( 3 )
-------------------------------------------------------------
Level:    2
Size:    256 kB
Cache groups:    ( 0 ) ( 1 ) ( 2 ) ( 3 )
-------------------------------------------------------------
Level:    3
Size:    6 MB
Cache groups:    ( 0 ) ( 1 ) ( 2 ) ( 3 )
-------------------------------------------------------------

*************************************************************
NUMA Topology
*************************************************************
NUMA domains: 1 
-------------------------------------------------------------
Domain 0:
Processors:  0 1 2 3
Relative distance to nodes:  10
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