[go-nuts] Why is Go Unicode concat so slow compared to Python3 ?

[Shubha Ramani]

Please see the attached two scripts.

Use python3 for concat_test.py.

I'm getting 591 nsec for the micro benchmark in python and 4453 ns for the 
microbenchmark in go. 
I stole this benchmark from Unicode.py of pybench, but changed it a bit.

(py36env) shubha@shubha-Z170X-UD5:~/myperformance$ go test 
--bench=UnicodeConcat
BenchmarkUnicodeConcat-8          300000              4453 ns/op

(py36env) shubha@shubha-Z170X-UD5:~/myperformance$ python concat_test.py
time_taken = 591.0059640882537 nsec




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concat_test.go
Description: Binary data

def mysetup():
    #pass
    global s
    global t
    s = u''.join(map(str, range(100)))
    t = u''.join(map(str, range(1, 101)))

    
#@profile

def concat():
   
         #1
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s

        #2
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s

         #3
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s


         #4
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s


         #5
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s

         #6
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s


         #7
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s


         #8
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s

         #9
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s


         #10
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s
         _ = t + s

        
        
        
if __name__ == "__main__":

    s = None
    t = None

    loops = 1000000
    import timeit    
    times = timeit.Timer(stmt="from __main__ import concat",setup="gc.enable();from __main__ import mysetup").repeat(7,loops)

    time_taken = min(times)/loops
    print ("time_taken = %s nsec\n" %(time_taken*1000000000))