2014-01-04 04:52:22 +00:00
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#include <string>
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#include <iostream>
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2017-04-01 09:19:00 +00:00
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#include <Core/Types.h>
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#include <IO/WriteHelpers.h>
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#include <IO/ReadHelpers.h>
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#include <IO/WriteBufferFromFile.h>
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#include <IO/ReadBufferFromFile.h>
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2014-01-04 04:52:22 +00:00
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2017-12-01 18:36:55 +00:00
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int main(int, char **)
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2014-01-04 04:52:22 +00:00
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{
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2017-04-01 07:20:54 +00:00
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using namespace DB;
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try
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{
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2020-03-23 02:12:31 +00:00
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static const size_t N = 100000;
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static const size_t BUF_SIZE = 1048576;
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2017-04-01 07:20:54 +00:00
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ReadBufferFromFile rand_in("/dev/urandom");
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unsigned rand = 0;
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readBinary(rand, rand_in);
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String test = "Hello, world! " + toString(rand);
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/// Write to file as usual, read with O_DIRECT.
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{
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WriteBufferFromFile wb("test1", BUF_SIZE);
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for (size_t i = 0; i < N; ++i)
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writeStringBinary(test, wb);
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wb.next();
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}
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{
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ReadBufferFromFile rb("test1", BUF_SIZE, O_RDONLY | O_DIRECT, nullptr, 4096);
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String res;
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for (size_t i = 0; i < N; ++i)
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readStringBinary(res, rb);
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std::cerr << "test: " << test << ", res: " << res << ", bytes: " << rb.count() << std::endl;
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}
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/// Write to file with O_DIRECT, read as usual.
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{
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WriteBufferFromFile wb("test2", BUF_SIZE, O_WRONLY | O_CREAT | O_TRUNC | O_DIRECT, 0666, nullptr, 4096);
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for (size_t i = 0; i < N; ++i)
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writeStringBinary(test, wb);
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if (wb.offset() % 4096 != 0)
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{
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size_t pad = 4096 - wb.offset() % 4096;
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memset(wb.position(), 0, pad);
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wb.position() += pad;
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}
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wb.next();
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}
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{
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ReadBufferFromFile rb("test2", BUF_SIZE);
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String res;
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for (size_t i = 0; i < N; ++i)
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readStringBinary(res, rb);
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std::cerr << "test: " << test << ", res: " << res << ", bytes: " << rb.count() << std::endl;
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}
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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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return 0;
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2014-01-04 04:52:22 +00:00
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}
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