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/***************************************************************************
* tests/io/test_io_sizes.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2010 Johannes Singler <singler@kit.edu>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#include <stxxl/io>
#include <stxxl/aligned_alloc>
#include <stxxl/bits/mng/block_manager.h>
//! \example io/test_io_sizes.cpp
//! This tests the maximum chunk size that a file type can handle with a single request.
int main(int argc, char** argv)
{
if (argc < 4)
{
std::cout << "Usage: " << argv[0] << " filetype tempfile maxsize" << std::endl;
return -1;
}
using stxxl::unsigned_type;
using stxxl::uint64;
unsigned_type max_size = atoi(argv[3]);
uint64* buffer = (uint64*)stxxl::aligned_alloc<4096>(max_size);
try
{
stxxl::compat_unique_ptr<stxxl::file>::result file(
stxxl::create_file(
argv[1], argv[2],
stxxl::file::CREAT | stxxl::file::RDWR | stxxl::file::DIRECT)
);
file->set_size(max_size);
stxxl::request_ptr req;
stxxl::stats_data stats1(*stxxl::stats::get_instance());
for (unsigned_type size = 4096; size < max_size; size *= 2)
{
//generate data
for (uint64 i = 0; i < size / sizeof(uint64); ++i)
buffer[i] = i;
//write
STXXL_MSG(stxxl::add_IEC_binary_multiplier(size, "B") << "are being written at once");
req = file->awrite(buffer, 0, size);
wait_all(&req, 1);
//fill with wrong data
for (uint64 i = 0; i < size / sizeof(uint64); ++i)
buffer[i] = 0xFFFFFFFFFFFFFFFFull;
//read again
STXXL_MSG(stxxl::add_IEC_binary_multiplier(size, "B") << "are being read at once");
req = file->aread(buffer, 0, size);
wait_all(&req, 1);
//check
bool wrong = false;
for (uint64 i = 0; i < size / sizeof(uint64); ++i)
if (buffer[i] != i)
{
STXXL_ERRMSG("Read inconsistent data at position " << i * sizeof(uint64));
wrong = true;
break;
}
if (wrong)
break;
}
std::cout << stxxl::stats_data(*stxxl::stats::get_instance()) - stats1;
file->close_remove();
}
catch (stxxl::io_error e)
{
std::cerr << e.what() << std::endl;
throw;
}
stxxl::aligned_dealloc<4096>(buffer);
return 0;
}
// vim: et:ts=4:sw=4
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