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[generator:preprocess] Optimize o5m reading: readahead usage

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This commit is contained in:
Anatoly Serdtcev 2019-11-11 15:00:34 +03:00
parent 7fd4934dd6
commit 797457330e
1 changed files with 3 additions and 0 deletions
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3
generator/osm_source.cpp
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@ -23,6 +23,8 @@
#include <boost/iostreams/device/mapped_file.hpp>
#include <boost/iostreams/stream.hpp>
#include <sys/mman.h>
#include "defines.hpp"
using namespace std;
@ -251,6 +253,7 @@ void BuildIntermediateDataFromO5M(
auto sourceMap = boost::iostreams::mapped_file_source{filename};
if (!sourceMap.is_open())
MYTHROW(Writer::OpenException, ("Failed to open", filename));
::madvise(const_cast<char*>(sourceMap.data()), sourceMap.size(), MADV_SEQUENTIAL);
constexpr size_t chunkSize = 10'000;
std::vector<std::thread> threads;