[Webkit-unassigned] [Bug 240006] [GTK][WPE] Expensive atomic operations, overabundant semaphore signaling in GPUProcess streaming IPC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240006

--- Comment #1 from Zan Dobersek <zan at falconsigh.net> ---
CPU load on the same WebGL load:

Disabled GPUProcess:

 Performance counter stats for process id '3599069' (WebProcess):

          5,035.64 msec task-clock                #    0.629 CPUs utilized          
             7,635      context-switches          #    1.516 K/sec                  
                35      cpu-migrations            #    6.950 /sec                   
               180      page-faults               #   35.745 /sec                   
     6,841,684,581      cycles                    #    1.359 GHz                    
     8,039,991,760      instructions              #    1.18  insn per cycle         
     1,787,173,079      branches                  #  354.905 M/sec                  
        52,361,168      branch-misses             #    2.93% of all branches        

       8.003704734 seconds time elapsed

Enabled GPUProcess:

 Performance counter stats for process id '3601229' (WebProcess):

          4,166.83 msec task-clock                #    0.521 CPUs utilized          
             4,042      context-switches          #  970.042 /sec                   
                18      cpu-migrations            #    4.320 /sec                   
               209      page-faults               #   50.158 /sec                   
     5,013,351,640      cycles                    #    1.203 GHz                    
     6,129,645,128      instructions              #    1.22  insn per cycle         
     1,387,168,345      branches                  #  332.907 M/sec                  
        50,932,209      branch-misses             #    3.67% of all branches        

       8.004450885 seconds time elapsed

 Performance counter stats for process id '3601322' (GPUProcess):

          2,795.15 msec task-clock                #    0.349 CPUs utilized          
           149,970      context-switches          #   53.654 K/sec                  
                17      cpu-migrations            #    6.082 /sec                   
               105      page-faults               #   37.565 /sec                   
     5,308,481,612      cycles                    #    1.899 GHz                    
     7,038,762,193      instructions              #    1.33  insn per cycle         
     1,542,811,483      branches                  #  551.959 M/sec                  
        16,204,399      branch-misses             #    1.05% of all branches        

       8.003696078 seconds time elapsed

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