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Merge pull request '12-hour difficulty adjustment window' (#451) from wowario/wownero:diff-v6 into dev

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Reviewed-on: https://git.wownero.com/wownero/wownero/pulls/451
This commit is contained in:
w0wΔri0 2023-01-23 05:13:46 +00:00
commit 7c47b97984
4 changed files with 61 additions and 15 deletions
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54
src/cryptonote_basic/difficulty.cpp
View file

@ -122,10 +122,10 @@ namespace cryptonote {
uint64_t next_difficulty_64(std::vector<std::uint64_t> timestamps, std::vector<uint64_t> cumulative_difficulties, size_t target_seconds) {
if(timestamps.size() > DIFFICULTY_WINDOW)
if(timestamps.size() > DIFFICULTY_WINDOW_V3)
{
timestamps.resize(DIFFICULTY_WINDOW);
cumulative_difficulties.resize(DIFFICULTY_WINDOW);
timestamps.resize(DIFFICULTY_WINDOW_V3);
cumulative_difficulties.resize(DIFFICULTY_WINDOW_V3);
}
@ -134,17 +134,17 @@ namespace cryptonote {
if (length <= 1) {
return 1;
}
static_assert(DIFFICULTY_WINDOW >= 2, "Window is too small");
assert(length <= DIFFICULTY_WINDOW);
static_assert(DIFFICULTY_WINDOW_V3 >= 2, "Window is too small");
assert(length <= DIFFICULTY_WINDOW_V3);
sort(timestamps.begin(), timestamps.end());
size_t cut_begin, cut_end;
static_assert(2 * DIFFICULTY_CUT <= DIFFICULTY_WINDOW - 2, "Cut length is too large");
if (length <= DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT) {
static_assert(2 * DIFFICULTY_CUT_V2 <= DIFFICULTY_WINDOW_V3 - 2, "Cut length is too large");
if (length <= DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) {
cut_begin = 0;
cut_end = length;
} else {
cut_begin = (length - (DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT) + 1) / 2;
cut_end = cut_begin + (DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT);
cut_begin = (length - (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) + 1) / 2;
cut_end = cut_begin + (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2);
}
assert(/*cut_begin >= 0 &&*/ cut_begin + 2 <= cut_end && cut_end <= length);
uint64_t time_span = timestamps[cut_end - 1] - timestamps[cut_begin];
@ -409,4 +409,40 @@ namespace cryptonote {
}
return next_D;
}
difficulty_type next_difficulty_v6(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds) {
if(timestamps.size() > DIFFICULTY_WINDOW_V3)
{
timestamps.resize(DIFFICULTY_WINDOW_V3);
cumulative_difficulties.resize(DIFFICULTY_WINDOW_V3);
}
size_t length = timestamps.size();
assert(length == cumulative_difficulties.size());
if (length <= 1) {
return 1;
}
static_assert(DIFFICULTY_WINDOW_V3 >= 2, "Window is too small");
assert(length <= DIFFICULTY_WINDOW_V3);
sort(timestamps.begin(), timestamps.end());
size_t cut_begin, cut_end;
static_assert(2 * DIFFICULTY_CUT_V2 <= DIFFICULTY_WINDOW_V3 - 2, "Cut length is too large");
if (length <= DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) {
cut_begin = 0;
cut_end = length;
} else {
cut_begin = (length - (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) + 1) / 2;
cut_end = cut_begin + (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2);
}
assert(/*cut_begin >= 0 &&*/ cut_begin + 2 <= cut_end && cut_end <= length);
uint64_t time_span = timestamps[cut_end - 1] - timestamps[cut_begin];
if (time_span == 0) {
time_span = 1;
}
difficulty_type total_work = cumulative_difficulties[cut_end - 1] - cumulative_difficulties[cut_begin];
assert(total_work > 0);
boost::multiprecision::uint256_t res = (boost::multiprecision::uint256_t(total_work) * target_seconds + time_span - 1) / time_span;
if(res > max128bit)
return 0; // to behave like previous implementation, may be better return max128bit?
return res.convert_to<difficulty_type>();
}
}

1
src/cryptonote_basic/difficulty.h
View file

@ -62,6 +62,7 @@ namespace cryptonote
difficulty_type next_difficulty_v3(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
difficulty_type next_difficulty_v4(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
difficulty_type next_difficulty_v5(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
difficulty_type next_difficulty_v6(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
std::string hex(difficulty_type v);
}

3
src/cryptonote_config.h
View file

@ -85,8 +85,11 @@
#define DIFFICULTY_WINDOW_V3 144
#define DIFFICULTY_WINDOW_V2 60
#define DIFFICULTY_WINDOW 720 // blocks
#define DIFFICULTY_LAG_V2 3
#define DIFFICULTY_LAG 15 // !!!
#define DIFFICULTY_CUT_V2 12
#define DIFFICULTY_CUT 60 // timestamps to cut after sorting
#define DIFFICULTY_BLOCKS_COUNT_V4 DIFFICULTY_WINDOW_V3 + DIFFICULTY_LAG_V2
#define DIFFICULTY_BLOCKS_COUNT_V3 DIFFICULTY_WINDOW_V3 + 1 // added +1 to make N=N
#define DIFFICULTY_BLOCKS_COUNT_V2 DIFFICULTY_WINDOW_V2 + 1 // added +1 to make N=N
#define DIFFICULTY_BLOCKS_COUNT DIFFICULTY_WINDOW + DIFFICULTY_LAG

18
src/cryptonote_core/blockchain.cpp
View file

@ -874,7 +874,7 @@ start:
ss << "Re-locked, height " << height << ", tail id " << new_top_hash << (new_top_hash == top_hash ? "" : " (different)") << std::endl;
top_hash = new_top_hash;
uint8_t version = get_current_hard_fork_version();
uint64_t difficulty_blocks_count = version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
uint64_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
// ND: Speedup
// 1. Keep a list of the last 735 (or less) blocks that is used to compute difficulty,
@ -954,7 +954,9 @@ start:
uint64_t HEIGHT = m_db->height();
difficulty_type diff = next_difficulty(timestamps, difficulties, target, HEIGHT);
if (version <= 17 && version >= 11) {
if (version >= 20) {
diff = next_difficulty_v6(timestamps, difficulties, target);
} else if (version <= 17 && version >= 11) {
diff = next_difficulty_v5(timestamps, difficulties, HEIGHT);
} else if (version == 10) {
diff = next_difficulty_v4(timestamps, difficulties, HEIGHT);
@ -1021,7 +1023,7 @@ size_t Blockchain::recalculate_difficulties(boost::optional<uint64_t> start_heig
const uint64_t top_height = m_db->height() - 1;
MGINFO("Recalculating difficulties from height " << start_height << " to height " << top_height);
uint8_t version = get_current_hard_fork_version();
uint64_t difficulty_blocks_count = version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
uint64_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
std::vector<uint64_t> timestamps;
std::vector<difficulty_type> difficulties;
timestamps.reserve(difficulty_blocks_count + 1);
@ -1048,7 +1050,9 @@ size_t Blockchain::recalculate_difficulties(boost::optional<uint64_t> start_heig
size_t target = DIFFICULTY_TARGET_V2;
difficulty_type recalculated_diff = next_difficulty(timestamps, difficulties, target, HEIGHT);
if (version <= 17 && version >= 11) {
if (version >= 20) {
recalculated_diff = next_difficulty_v6(timestamps, difficulties, target);
} else if (version <= 17 && version >= 11) {
recalculated_diff = next_difficulty_v5(timestamps, difficulties, HEIGHT);
} else if (version == 10) {
recalculated_diff = next_difficulty_v4(timestamps, difficulties, HEIGHT);
@ -1310,7 +1314,7 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
std::vector<difficulty_type> cumulative_difficulties;
uint8_t version = get_current_hard_fork_version();
size_t difficulty_blocks_count = version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
size_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
// if the alt chain isn't long enough to calculate the difficulty target
// based on its blocks alone, need to get more blocks from the main chain
@ -1368,7 +1372,9 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
// calculate the difficulty target for the block and return it
difficulty_type next_diff = next_difficulty(timestamps, cumulative_difficulties, target, HEIGHT);
if (version <= 17 && version >= 11) {
if (version >= 20) {
next_difficulty_v6(timestamps, cumulative_difficulties, target);
} else if (version <= 17 && version >= 11) {
next_diff = next_difficulty_v5(timestamps, cumulative_difficulties, HEIGHT);
} else if (version == 10) {
next_diff = next_difficulty_v4(timestamps, cumulative_difficulties, HEIGHT);