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86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
#include <string>
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#include <iostream>
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#include <fstream>
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#include <Core/Types.h>
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#include <Common/Stopwatch.h>
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#include <Common/formatReadable.h>
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#include <IO/readFloatText.h>
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#include <IO/WriteHelpers.h>
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#include <IO/Operators.h>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <Compression/CompressedReadBuffer.h>
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/** How to test:
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# Prepare data
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$ clickhouse-local --query="SELECT number FROM system.numbers LIMIT 10000000" > numbers1.tsv
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$ clickhouse-local --query="SELECT number % 10 FROM system.numbers LIMIT 10000000" > numbers2.tsv
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$ clickhouse-local --query="SELECT number / 1000 FROM system.numbers LIMIT 10000000" > numbers3.tsv
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$ clickhouse-local --query="SELECT rand64() / 1000 FROM system.numbers LIMIT 10000000" > numbers4.tsv
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$ clickhouse-local --query="SELECT rand64() / 0xFFFFFFFF FROM system.numbers LIMIT 10000000" > numbers5.tsv
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$ clickhouse-local --query="SELECT log(rand64()) FROM system.numbers LIMIT 10000000" > numbers6.tsv
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$ clickhouse-local --query="SELECT 1 / rand64() FROM system.numbers LIMIT 10000000" > numbers7.tsv
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$ clickhouse-local --query="SELECT exp(rand() / 0xFFFFFF) FROM system.numbers LIMIT 10000000" > numbers8.tsv
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$ clickhouse-local --query="SELECT number FROM system.numbers LIMIT 10000000" > numbers1.tsv
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$ clickhouse-local --query="SELECT toString(rand64(1)) || toString(rand64(2)) || toString(rand64(3)) || toString(rand64(4)) FROM system.numbers LIMIT 10000000" > numbers9.tsv
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$ clickhouse-local --query="SELECT toString(rand64(1)) || toString(rand64(2)) || '.' || toString(rand64(3)) || toString(rand64(4)) FROM system.numbers LIMIT 10000000" > numbers10.tsv
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# Run test
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$ for i in {1..10}; do echo $i; time ./read_float_perf 2 < numbers$i.tsv; done
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*/
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using namespace DB;
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template <typename T, void F(T&, ReadBuffer&)>
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void NO_INLINE loop(ReadBuffer & in, WriteBuffer & out)
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{
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T sum = 0;
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T x = 0;
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Stopwatch watch;
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while (!in.eof())
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{
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F(x, in);
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in.ignore();
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sum += x;
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}
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watch.stop();
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out << "Read in " << watch.elapsedSeconds() << " sec, " << formatReadableSizeWithBinarySuffix(in.count() / watch.elapsedSeconds()) << "/sec, result = " << sum << "\n";
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}
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int main(int argc, char ** argv)
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try
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{
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int method = 0;
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if (argc >= 2)
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method = parse<int>(argv[1]);
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using T = Float64;
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ReadBufferFromFileDescriptor in(STDIN_FILENO);
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WriteBufferFromFileDescriptor out(STDOUT_FILENO);
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if (method == 1) loop<T, readFloatTextPrecise>(in, out);
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if (method == 2) loop<T, readFloatTextFast>(in, out);
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if (method == 3) loop<T, readFloatTextSimple>(in, out);
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return 0;
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}
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catch (const Exception & e)
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{
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std::cerr << e.what() << ", " << e.displayText() << std::endl;
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return 1;
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}
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