bench.cpp

#include <jsoncons/json.hpp>
#include <jsoncons_ext/cbor/cbor.hpp>

#include <fstream>
#include <chrono>

using namespace jsoncons;

int main()
{

    std::ifstream is("/tmp/bench-bytes", std::ios::binary);
    if (not is){
        std::cerr<<"failed to open file!"<<std::endl;
        return 1;
    }
    is.seekg (0, is.end);
    int length = is.tellg();
    is.seekg (0, is.beg);

    std::vector<uint8_t> buf(length);
    is.read(reinterpret_cast<char*>(buf.data()), length);
    std::cout<<"buf size: "<<buf.size()<<std::endl;

    auto t1 = std::chrono::high_resolution_clock::now();

    auto v = cbor::decode_cbor<std::vector<float>>(buf);

    auto t2 = std::chrono::high_resolution_clock::now();
    auto duration = std::chrono::duration_cast<std::chrono::milliseconds>( t2 - t1 ).count();

    std::cout<<"dec time: " << duration<<" ms"<<std::endl;

    std::cout << "dec length "<<v.size()<<std::endl;


    std::cout<<"dec first 5 elems:\n";
    for (int i = 0; i < 5; ++i){
        std::cout << std::defaultfloat << v[i] << "\n";
    }


}

bench.py

#!/usr/bin/env python
# coding: utf-8



import time
import sys

import cbor2
import numpy as np


r = np.random.rand(13100100).astype(np.float32)

print ("length: %d" % len(r))
print ("first 5 elems: %s" % r[:5])

def float32_encoder(encoder, value):
    assert value.dtype == np.dtype('float32')
    assert value.dtype.byteorder == '='
    assert sys.byteorder == 'little'
    encoder.encode(cbor2.CBORTag(85, value.tobytes()))

bt = time.time()
encoded = cbor2.dumps(r, default = float32_encoder)
print ("enc time: %s" % (time.time() - bt))

with open('/tmp/bench-bytes', 'wb') as f:
    f.write(encoded)



def typed_arr_decoder(decoder, tag, shareable_index=None):
    if tag.tag not in (85, ) :
        return tag

    if tag.tag == 85:
        assert sys.byteorder == 'little'
        return np.frombuffer(tag.value, np.float32)

bt = time.time()
dec_r = cbor2.loads(encoded, tag_hook = typed_arr_decoder)
print ("dec time: %s" % (time.time() - bt))


print ("dec length: %d" % len(dec_r))
print ("dec first 5 elems: %s" % dec_r[:5])