On 02/27/2017 07:21 PM, Ian Lance Taylor wrote:
> On Mon, Feb 27, 2017 at 3:58 PM, Shubha Ramani
> <[email protected]> wrote:
>> 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
>
> I'm no Python expert, but I don't see any evidence that your Python
> code is actually executing either mysetup or concat.
>
I noticed the same thing. Even after you do call myinit() the
performance difference is still the same with python2.7.
python3 has similar performance to Go:
ayan@kiwi:~/unicode$ python --version
Python 2.7.13
ayan@kiwi:~/unicode$ python ./concat_test.py
time_taken = 924.661159515 nsec
ayan@kiwi:~/unicode$ python3 ./concat_test.py
time_taken = 2005.0194200011902 nsec
ayan@kiwi:~/unicode$ go test -bench=.
BenchmarkUnicodeConcat-2 100000 19751 ns/op
PASS
ok _/home/ayan/unicode 2.175s
Here's pprof output on my machine. The runtime.memclr() call sticks out
to me.
ayan@kiwi:~/unicode$ go tool pprof prof.cpu
Entering interactive mode (type "help" for commands)
(pprof) top10
1090ms of 1430ms total (76.22%)
Showing top 10 nodes out of 103 (cum >= 20ms)
flat flat% sum% cum cum%
480ms 33.57% 33.57% 480ms 33.57% runtime.memmove
240ms 16.78% 50.35% 240ms 16.78% runtime.memclr
110ms 7.69% 58.04% 550ms 38.46% runtime.mallocgc
60ms 4.20% 62.24% 1180ms 82.52% runtime.concatstrings
40ms 2.80% 65.03% 40ms 2.80% runtime.futex
40ms 2.80% 67.83% 40ms 2.80% runtime.heapBitsForObject
40ms 2.80% 70.63% 40ms 2.80% runtime/internal/atomic.Xchg
30ms 2.10% 72.73% 80ms 5.59% runtime.(*mheap).allocSpanLocked
30ms 2.10% 74.83% 620ms 43.36% runtime.rawstring
20ms 1.40% 76.22% 20ms 1.40% runtime.(*mSpanList).remove
(pprof)
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