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I'm running a multi-threaded server on a linux machine with 40 cores. The program has some serious bottlenecks since I cannot get the CPU utilization above 30% no matter how much load IO give it.

The top few lines of perf top output look as follows

Overhead  Shared Object                               Symbol
  27.18%  0.dylib.opt                                 [.] run
  13.88%  0.dylib.opt                                 [.] run
   9.75%  0.dylib.opt                                 [.] run
   6.31%  0.dylib.opt                                 [.] run
   5.55%  0.dylib.opt                                 [.] run

what is 0.dylib.opt and how can I investigate it further?

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