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: 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
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