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Window step size defaults depending on compression level

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This commit is contained in:
Marcus Holland-Moritz 2021-03-20 21:36:04 +01:00
parent c322650738
commit 592c7376ce
2 changed files with 25 additions and 19 deletions
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2
src/dwarfs/block_manager.cpp
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@ -284,6 +284,8 @@ class block_manager_ final : public block_manager::impl {
, block_size_{static_cast<size_t>(1) << cfg.block_size_bits}
, filter_{bloom_filter_size()} {
if (segmentation_enabled()) {
LOG_INFO << "using a " << size_with_unit(window_size_) << " window at "
<< size_with_unit(window_step_) << " steps for segment analysis";
LOG_INFO << "bloom filter size: " << size_with_unit(filter_.size() / 8);
}
}

38
src/mkdwarfs.cpp
View File

@ -219,6 +219,7 @@ struct level_defaults {
char const* schema_compression;
char const* metadata_compression;
unsigned window_size;
unsigned window_step;
char const* order;
};
@ -308,16 +309,16 @@ struct level_defaults {
constexpr std::array<level_defaults, 10> levels{{
// clang-format off
/* 0 */ {20, "null", "null" , "null", 0, "none"},
/* 1 */ {20, ALG_DATA_1, ALG_SCHEMA, "null", 0, "path"},
/* 2 */ {20, ALG_DATA_2, ALG_SCHEMA, "null", 0, "path"},
/* 3 */ {21, ALG_DATA_3, ALG_SCHEMA, "null", 12, "similarity"},
/* 4 */ {22, ALG_DATA_4, ALG_SCHEMA, "null", 12, "similarity"},
/* 5 */ {23, ALG_DATA_5, ALG_SCHEMA, "null", 12, "similarity"},
/* 6 */ {24, ALG_DATA_6, ALG_SCHEMA, "null", 12, "nilsimsa"},
/* 7 */ {24, ALG_DATA_7, ALG_SCHEMA, ALG_METADATA_7, 12, "nilsimsa"},
/* 8 */ {24, ALG_DATA_8, ALG_SCHEMA, ALG_METADATA_9, 12, "nilsimsa"},
/* 9 */ {26, ALG_DATA_9, ALG_SCHEMA, ALG_METADATA_9, 12, "nilsimsa"},
/* 0 */ {20, "null", "null" , "null", 0, 0, "none"},
/* 1 */ {20, ALG_DATA_1, ALG_SCHEMA, "null", 0, 0, "path"},
/* 2 */ {20, ALG_DATA_2, ALG_SCHEMA, "null", 0, 0, "path"},
/* 3 */ {21, ALG_DATA_3, ALG_SCHEMA, "null", 12, 1, "similarity"},
/* 4 */ {22, ALG_DATA_4, ALG_SCHEMA, "null", 12, 2, "similarity"},
/* 5 */ {23, ALG_DATA_5, ALG_SCHEMA, "null", 12, 2, "similarity"},
/* 6 */ {24, ALG_DATA_6, ALG_SCHEMA, "null", 12, 3, "nilsimsa"},
/* 7 */ {24, ALG_DATA_7, ALG_SCHEMA, ALG_METADATA_7, 12, 3, "nilsimsa"},
/* 8 */ {24, ALG_DATA_8, ALG_SCHEMA, ALG_METADATA_9, 12, 4, "nilsimsa"},
/* 9 */ {26, ALG_DATA_9, ALG_SCHEMA, ALG_METADATA_9, 12, 4, "nilsimsa"},
// clang-format on
}};
@ -377,8 +378,7 @@ int mkdwarfs(int argc, char** argv) {
po::value<unsigned>(&cfg.blockhash_window_size),
"window sizes for block hashing")
("window-step",
po::value<unsigned>(&cfg.window_increment_shift)
->default_value(1),
po::value<unsigned>(&cfg.window_increment_shift),
"window step (as right shift of size)")
("bloom-filter-size",
po::value<unsigned>(&cfg.bloom_filter_size)->default_value(5),
@ -482,7 +482,7 @@ int mkdwarfs(int argc, char** argv) {
l_or = std::max(l_or, ::strlen(l.order));
}
std::string sep(28 + l_dc + l_sc + l_mc + l_or, '-');
std::string sep(30 + l_dc + l_sc + l_mc + l_or, '-');
std::cout << "mkdwarfs (" << PRJ_GIT_ID << ")\n\n" << opts << std::endl;
std::cout << "Compression level defaults:\n"
@ -492,17 +492,17 @@ int mkdwarfs(int argc, char** argv) {
"Window")
<< fmt::format(" Size {:{}s} {:{}s} {:{}s} {:6s}\n",
"Block Data", l_dc, "Schema", l_sc, "Metadata",
l_mc, "Size Order")
l_mc, "Size/Step Order")
<< " " << sep << std::endl;
int level = 0;
for (auto const& l : levels) {
std::cout << fmt::format(" {:1d} {:2d} {:{}s} {:{}s} {:{}s} "
" {:2d} {:{}s}",
std::cout << fmt::format(" {:1d} {:2d} {:{}s} {:{}s} {:{}s}"
" {:2d} / {:1d} {:{}s}",
level, l.block_size_bits, l.data_compression,
l_dc, l.schema_compression, l_sc,
l.metadata_compression, l_mc, l.window_size,
l.order, l_or)
l.window_step, l.order, l_or)
<< std::endl;
++level;
}
@ -562,6 +562,10 @@ int mkdwarfs(int argc, char** argv) {
cfg.blockhash_window_size = defaults.window_size;
}
if (!vm.count("window-step")) {
cfg.window_increment_shift = defaults.window_step;
}
if (!vm.count("order")) {
order = defaults.order;
}