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author | Aaron Patterson <aaron.patterson@gmail.com> | 2016-02-08 15:40:10 -0800 |
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committer | Aaron Patterson <aaron.patterson@gmail.com> | 2016-02-08 15:40:25 -0800 |
commit | 02c3867882d6d23b10df262a6db5f937ca69fb53 (patch) | |
tree | 78b5b8416ef494cb65a03e06fc8ee9d244814400 /activemodel/test/models | |
parent | e6fc78bfbd53b6426cada34ab40079b44454f708 (diff) | |
download | rails-02c3867882d6d23b10df262a6db5f937ca69fb53.tar.gz rails-02c3867882d6d23b10df262a6db5f937ca69fb53.tar.bz2 rails-02c3867882d6d23b10df262a6db5f937ca69fb53.zip |
speed up string xor operation and reduce object allocations
```
[aaron@TC rails (master)]$ cat xor.rb
a = "\x14b\"\xB4P8\x05\x8D\xC74\xC3\xEC}\xFDf\x8E!h\xCF^\xBF\xA5%\xC6\xF0\xA9\xF9x\x04\xFA\xF1\x82"
b = "O.\xF7\x01\xA9D\xA3\xE1D\x7FU\x85\xFC\x8Ak\e\x04\x8A\x97\x91\xD01\x02\xA4G\x1EIf:Y\x0F@"
def xor_byte_strings(s1, s2)
s1.bytes.zip(s2.bytes).map { |(c1,c2)| c1 ^ c2 }.pack('c*')
end
def xor_byte_strings2(s1, s2)
s2_bytes = s2.bytes
s1.bytes.map.with_index { |c1, i| c1 ^ s2_bytes[i] }.pack('c*')
end
require 'benchmark/ips'
require 'allocation_tracer'
Benchmark.ips do |x|
x.report 'xor_byte_strings' do
xor_byte_strings a, b
end
x.report 'xor_byte_strings2' do
xor_byte_strings2 a, b
end
end
ObjectSpace::AllocationTracer.setup(%i{type})
result = ObjectSpace::AllocationTracer.trace do
xor_byte_strings a, b
end
p :xor_byte_strings => result
ObjectSpace::AllocationTracer.clear
result = ObjectSpace::AllocationTracer.trace do
xor_byte_strings2 a, b
end
p :xor_byte_strings2 => result
[aaron@TC rails (master)]$ ruby -I~/git/allocation_tracer/lib xor.rb
Calculating -------------------------------------
xor_byte_strings 10.087k i/100ms
xor_byte_strings2 11.339k i/100ms
-------------------------------------------------
xor_byte_strings 108.386k (± 5.8%) i/s - 544.698k
xor_byte_strings2 122.239k (± 3.0%) i/s - 612.306k
{:xor_byte_strings=>{[:T_ARRAY]=>[38, 0, 0, 0, 0, 0], [:T_STRING]=>[2, 0, 0, 0, 0, 0]}}
{:xor_byte_strings2=>{[:T_ARRAY]=>[3, 0, 0, 0, 0, 0], [:T_DATA]=>[1, 0, 0, 0, 0, 0], [:T_IMEMO]=>[2, 0, 0, 0, 0, 0], [:T_STRING]=>[2, 0, 0, 0, 0, 0]}}
```
Diffstat (limited to 'activemodel/test/models')
0 files changed, 0 insertions, 0 deletions