通过perf( perf 是内核自带的性能剖析工具) 可以采集 CPU 的热点,看看 sys 利用率高时,哪些内核耗时的 CPU 利用率高; 通过perf 的call-graph功能可以查看具体的调用栈信息,也就是线程是从什么路径上执行下来的; 通过perf 的annotate功能可以追踪到线程是在内核函数的哪些语句上比较耗时; 通过ftrace 的function-grap...
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CPU Idle States GraphIf idle state information is collected in a trace, the Power/CPU Idle States graph will display in the WPA UI. This graph always contains data on the Target idle state for each processor. The graph will also contain information on each processor’s Actual idle state if...
通过编程控制CPU利用率(r4笔记第69天) 今天想起一个几年前学习过的程序,是在《编程之美》中提到的,是作为当时微软的面试题,写一个程序来控制CPU的利用率保持在50%,进一步延伸,能够写出程序来画出CPU利用率的正弦曲线。 这个题目看起来真是奇怪,能够达到这种程度,编程感觉就是出神入化了,但是仔细看看这个题目还是...
Basic block,即一段连续无跳转的一段指令(将整个程序以跳转指令为边界分成多个basic blocks),编译器会以basic block作为control flow graph(CFG)的节点。Missed predictions per kilo-instructions (MPKI),即每一千条指令中错误预测数,MPKI已经成为现代衡量分支预测的指标,引入这个指标主要因为预测准确率已经非常高,(经...
Example usage:./cross_cpu_cluster_graph.py 835:results/p2/main/results.json 855:results/zf6/main/results.json 855+:results/rog2/main/results.json 765G:results/p5/new-final/results.json active/power_mean +soccolor +minscl Unified cluster graph ...
And, you can also use it to overclock your memory and control how many active cores and threads your processor is using (which may be helpful in some applications or to reduce overall power consumption). It also has a more up-to-date interface when compared to a lot of the other hardwar...
Recently, a combination of non-invasive neuroimaging techniques and graph theoretical approaches has provided a unique opportunity for understanding the patterns of the structural and functional connectivity of the human brain (referred to as the human brain connectome). Currently, there is a very large...
Contribution Graph Day of Week December Dec January Jan February Feb March Mar April Apr May May June Jun July Jul August Aug September Sep October Oct November Nov Sunday Sun Monday Mon Tuesday Tue Wednesday Wed Thursday Thu Friday Fri Saturday Sat Learn how we count contributions ...
$ FlameGraph/flamegraph.pl out.folded > out.svg 1. 2. 3. 4. ECS和perf 在ECS会采集不到 cycles等,cpu-clock、page-faults都是内核中的软事件,cycles/instructions得采集cpu的PMU数据,ECS采集不到这些PMU数据。 Perf 和 false share cache_line ...