bpo-32630 benchmark

results.txt

$ envs/3.7-master-pgo-lto/prefix/bin/python3.7m ~/dev/python/cpython/Modules/_decimal/tests/bench.py

# ======================================================================
#                   Calculating pi, 10000 iterations
# ======================================================================


Precision: 9 decimal digits

float:
result: 3.1415926535897927
time: 0.048688s

cdecimal:
result: 3.14159265
time: 0.096675s

decimal:
result: 3.14159265
time: 8.458241s


Precision: 19 decimal digits

float:
result: 3.1415926535897927
time: 0.051486s

cdecimal:
result: 3.141592653589793236
time: 0.226973s

decimal:
result: 3.141592653589793236
time: 19.495910s


# ======================================================================
#                               Factorial
# ======================================================================

n = 100000

cdecimal:
calculation time: 0.356986s
conversion time: 0.001510s

int:
calculation time: 0.232633s
conversion time: 3.223236s

------------------------------------------------------------------------------------------------------------------------

$ envs/3.7-master-pgo+lto+decimal-contextvars/prefix/bin/python3.7m ~/dev/python/cpython/Modules/_decimal/tests/bench.py 

# ======================================================================
#                   Calculating pi, 10000 iterations
# ======================================================================


Precision: 9 decimal digits

float:
result: 3.1415926535897927
time: 0.048424s

cdecimal:
result: 3.14159265
time: 0.100751s

decimal:
result: 3.14159265
time: 8.441837s


Precision: 19 decimal digits

float:
result: 3.1415926535897927
time: 0.049039s

cdecimal:
result: 3.141592653589793236
time: 0.227153s

decimal:
result: 3.141592653589793236
time: 19.353406s


# ======================================================================
#                               Factorial
# ======================================================================

n = 100000

cdecimal:
calculation time: 0.349761s
conversion time: 0.001494s

int:
calculation time: 0.236077s
conversion time: 3.224016s

vanilla:     0.096675s    0.226973s    0.356986s    0.001510s
contextvars: 0.100751s    0.227153s    0.349761s    0.001494s
-------------------------------------------------------------
             1.04x slower 1.00         1.02x faster 1.01x faster