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// Copyright (C) 2019-2022 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "LocalStorage.hpp"
#include <AtomicFile.hpp>
#include <Context.hpp>
#include <File.hpp>
#include <Logging.hpp>
#include <TemporaryFile.hpp>
#include <ThreadPool.hpp>
#include <assertions.hpp>
#include <core/CacheEntry.hpp>
#include <core/FileRecompressor.hpp>
#include <core/Manifest.hpp>
#include <core/Result.hpp>
#include <core/exceptions.hpp>
#include <core/wincompat.hpp>
#include <fmtmacros.hpp>
#include <storage/local/StatsFile.hpp>
#include <util/expected.hpp>
#include <util/file.hpp>
#include <util/string.hpp>
#include <third_party/fmt/core.h>
#include <atomic>
#include <memory>
#include <string>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
namespace storage::local {
CompressionStatistics
LocalStorage::get_compression_statistics(
const ProgressReceiver& progress_receiver) const
{
CompressionStatistics cs{};
for_each_level_1_subdir(
m_config.cache_dir(),
[&](const auto& subdir, const auto& sub_progress_receiver) {
const auto files = get_level_1_files(
subdir, [&](double progress) { sub_progress_receiver(progress / 2); });
for (size_t i = 0; i < files.size(); ++i) {
const auto& cache_file = files[i];
cs.on_disk_size += cache_file.size_on_disk();
try {
core::CacheEntry::Header header(cache_file.path());
cs.compr_size += cache_file.size();
cs.content_size += header.entry_size;
} catch (core::Error&) {
cs.incompr_size += cache_file.size();
}
sub_progress_receiver(1.0 / 2 + 1.0 * i / files.size() / 2);
}
},
progress_receiver);
return cs;
}
void
LocalStorage::recompress(const std::optional<int8_t> level,
const uint32_t threads,
const ProgressReceiver& progress_receiver)
{
const size_t read_ahead =
std::max(static_cast<size_t>(10), 2 * static_cast<size_t>(threads));
ThreadPool thread_pool(threads, read_ahead);
core::FileRecompressor recompressor;
std::atomic<uint64_t> incompressible_size = 0;
for_each_level_1_subdir(
m_config.cache_dir(),
[&](const auto& subdir, const auto& sub_progress_receiver) {
auto files = get_level_1_files(subdir, [&](double progress) {
sub_progress_receiver(0.1 * progress);
});
auto stats_file = subdir + "/stats";
for (size_t i = 0; i < files.size(); ++i) {
const auto& file = files[i];
if (file_type_from_path(file.path()) != FileType::unknown) {
thread_pool.enqueue(
[&recompressor, &incompressible_size, level, stats_file, file] {
try {
Stat new_stat = recompressor.recompress(
file, level, core::FileRecompressor::KeepAtime::no);
auto size_change_kibibyte =
Util::size_change_kibibyte(file, new_stat);
if (size_change_kibibyte != 0) {
StatsFile(stats_file).update([=](auto& cs) {
cs.increment(core::Statistic::cache_size_kibibyte,
size_change_kibibyte);
});
}
} catch (core::Error&) {
// Ignore for now.
incompressible_size += file.size_on_disk();
}
});
} else if (!TemporaryFile::is_tmp_file(file.path())) {
incompressible_size += file.size_on_disk();
}
sub_progress_receiver(0.1 + 0.9 * i / files.size());
}
if (util::ends_with(subdir, "f")) {
// Wait here instead of after for_each_level_1_subdir to avoid
// updating the progress bar to 100% before all work is done.
thread_pool.shut_down();
}
},
progress_receiver);
// In case there was no f subdir, shut down the thread pool now.
thread_pool.shut_down();
if (isatty(STDOUT_FILENO)) {
PRINT_RAW(stdout, "\n\n");
}
const double old_ratio = recompressor.old_size() > 0
? static_cast<double>(recompressor.content_size())
/ recompressor.old_size()
: 0.0;
const double old_savings =
old_ratio > 0.0 ? 100.0 - (100.0 / old_ratio) : 0.0;
const double new_ratio = recompressor.new_size() > 0
? static_cast<double>(recompressor.content_size())
/ recompressor.new_size()
: 0.0;
const double new_savings =
new_ratio > 0.0 ? 100.0 - (100.0 / new_ratio) : 0.0;
const int64_t size_difference =
static_cast<int64_t>(recompressor.new_size())
- static_cast<int64_t>(recompressor.old_size());
const std::string old_compr_size_str =
Util::format_human_readable_size(recompressor.old_size());
const std::string new_compr_size_str =
Util::format_human_readable_size(recompressor.new_size());
const std::string content_size_str =
Util::format_human_readable_size(recompressor.content_size());
const std::string incompr_size_str =
Util::format_human_readable_size(incompressible_size);
const std::string size_difference_str =
FMT("{}{}",
size_difference < 0 ? "-" : (size_difference > 0 ? "+" : " "),
Util::format_human_readable_size(
size_difference < 0 ? -size_difference : size_difference));
PRINT(stdout, "Original data: {:>8s}\n", content_size_str);
PRINT(stdout,
"Old compressed data: {:>8s} ({:.1f}% of original size)\n",
old_compr_size_str,
100.0 - old_savings);
PRINT(stdout,
" - Compression ratio: {:>5.3f} x ({:.1f}% space savings)\n",
old_ratio,
old_savings);
PRINT(stdout,
"New compressed data: {:>8s} ({:.1f}% of original size)\n",
new_compr_size_str,
100.0 - new_savings);
PRINT(stdout,
" - Compression ratio: {:>5.3f} x ({:.1f}% space savings)\n",
new_ratio,
new_savings);
PRINT(stdout, "Size change: {:>9s}\n", size_difference_str);
}
} // namespace storage::local
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