[root@bogon c++]# perf stat -e L1-dcache-load-misses ./miss1Performance counter statsfor'./miss 1':1,015,363L1-dcache-load-misses0.012145156seconds time elapsed0.006134000seconds user0.006134000seconds sys [root@bogon c++]# perf stat -e L1-dcache-load-misses ./miss0Performance counter stats...
LLC Misses to Remote cache (HITM): LLC miss从远程cache中读取(该cacheline已修改); 其中HITM一行正好对应了false sharing的情况。在本例子中,不同的数据却因为cache缓存问题导致了33%的cache miss,这对性能影响较大。 为了解决问题,一个简单的方法就是让两个counter无法被L1缓存行一行读取,这样每次更新counter...
lynch@Meta:~/workspace/docker_env/user_home/RZG2L_V2/RZG2L/myir-renesas-linux$ 3)使用perf list cache命令,确认cache相关的event,已经开启。 List of pre-defined events (to be used in -e): L1-dcache-load-misses [Hardware cache event] L1-dcache-loads [Hardware cache event] L1-icache-l...
L1-dcache-prefetches [Hardware cache event] L1-dcache-prefetch-misses [Hardware cache event] L1-icache-loads [Hardware cache event] L1-icache-load-misses [Hardware cache event] L1-icache-prefetches [Hardware cache event] L1-icache-prefetch-misses [Hardware cache event] LLC-loads [Hardware ...
Hardware Events: CPU的PMU(performance monitoring unit)触发的事件,也叫performance monitoring counters (PMCs),例如cpu-cycles、cache miss Software Events: 一些比较底层的软件event,例如缺页、timer(定时) Kernel Tracepoint Events: 内核中的tracepoint
当CPU 需要访问一块数据或者指令时,它会首先查看最靠近的一级缓存(L1);如果数据存在,那么就是缓存命中(Cache Hit),否则就是不命中(Cache Miss),需要继续查询下一级缓存。 c2c用来检测cache共享命中失败,一个处理器修改了某个cache line中的数据,另一个处理器访问该cache line数据时需要refresh该cache line, perf...
硬體相關cache event,L1 dcache miss, TLB miss, … 參考文獻: Linux - Perf system analysis.pdf 關於Perf的五個問答 1、為什麼使用perf而不是別的分析工具? 答:因為perf是Linux自帶的系統性能分析工具,perf利用內核中的性能計數器(performance counters)來收集系統的各種性能數據,包括CPUidle 、DDR使用等等。
Hardware Events:CPU的PMU(performance monitoring unit)触发的事件,也叫performance monitoring counters (PMCs),例如cpu-cycles、cache missSoftware Events: 一些比较底层的软件event,例如缺页、timer(定时)Kernel Tracepoint Events: 内核中的tracepointUser Statically-Defined Tracing (USDT): 用户态的tracepointDynamic...
L1-icache-loads [Hardware cache event] branch-load-misses [Hardware cache event] branch-loads [Hardware cache event] dTLB-load-misses [Hardware cache event] iTLB-load-misses [Hardware cache event] br_immed_retired ORarmv8_pmuv3/br_immed_retired/ [Kernel PMU event] ...
For several cache load/miss indicators, perf stat indicates that these are <not supported>: $ perf stat -e L1-icache-loads,L1-icache-load-misses,L1-dcache-loads,L1-dcache-load-misses,LLC-loads,LLC-load-misses myprogram Performance counter stats for 'myprogram': <not supported> L1-...