如何在Linux上查找此抖动的来源？

perf输出是：

4223.769000 task-clock (msec)         #    1.000 CPUs utilized          
                 0 context-switches          #    0.000 K/sec                  
                 0 cpu-migrations            #    0.000 K/sec                  
             1,129 page-faults               #    0.267 K/sec                  
    10,977,496,067 cycles                    #    2.599 GHz                    
     5,798,270,864 stalled-cycles-frontend   #   52.82% frontend cycles idle   
   <not supported> stalled-cycles-backend  
    11,756,238,450 instructions              #    1.07  insns per cycle        
                                             #    0.49  stalled cycles per insn
     2,093,679,462 branches                  #  495.690 M/sec                  
        14,232,955 branch-misses             #    0.68% of all branches        

       4.222272487 seconds time elapsed

解决方法

sudo trace-cmd record -s 1000 -b 10000 -e all -o trace_1.dat `taskset -c 5 ./a.out > dfa2.tmp`
sudo trace-cmd report -i trace_1.dat > tmp_1.txt

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