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optimization: Bulk serialization writes in SaveBlockUndo and SaveBlock

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Similarly to the serialization reads, buffered writes will enable batched xor calculations - especially since currently we need to copy the write inputs Span to do the obfuscation on it, batching enables doing the xor on the internal buffer instead.

Before:
|               ns/op |                op/s |    err% |     total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
|        5,244,636.51 |              190.67 |    0.3% |     11.04 | `SaveBlockToDiskBench`

After:
|               ns/op |                op/s |    err% |     total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
|        1,787,371.46 |              559.48 |    1.6% |     11.16 | `SaveBlockToDiskBench`

Co-authored-by: Cory Fields <cory-nospam-@coryfields.com>
This commit is contained in:
Lőrinc 2024-12-17 13:05:41 +01:00
parent 34eafa54a6
commit 1f736fbdb4
1 changed files with 36 additions and 16 deletions
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52
src/node/blockstorage.cpp
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@ -951,31 +951,38 @@ bool BlockManager::SaveBlockUndo(const CBlockUndo& blockundo, BlockValidationSta
const BlockfileType type = BlockfileTypeForHeight(block.nHeight);
auto& cursor = *Assert(WITH_LOCK(cs_LastBlockFile, return m_blockfile_cursors[type]));
// Write undo information to disk
if (block.GetUndoPos().IsNull()) {
FlatFilePos pos;
const uint32_t blockundo_size{static_cast<uint32_t>(GetSerializeSize(blockundo))};
if (!FindUndoPos(state, block.nFile, pos, blockundo_size + UNDO_DATA_DISK_OVERHEAD)) {
if (!FindUndoPos(state, block.nFile, pos, UNDO_DATA_DISK_OVERHEAD + blockundo_size)) {
LogError("%s: FindUndoPos failed\n", __func__);
return false;
}
// Open history file to append
AutoFile fileout{OpenUndoFile(pos)};
AutoFile fileout{m_undo_file_seq.Open(pos, false), {}}; // We'll obfuscate ourselves
if (fileout.IsNull()) {
LogError("%s: OpenUndoFile failed\n", __func__);
return FatalError(m_opts.notifications, state, _("Failed to write undo data."));
}
// Write index header
fileout << GetParams().MessageStart() << blockundo_size;
{
DataStream header;
header.reserve(BLOCK_SERIALIZATION_HEADER_SIZE);
header << GetParams().MessageStart() << blockundo_size;
util::Xor(header, m_xor_key, pos.nPos);
fileout.write(header);
}
pos.nPos += BLOCK_SERIALIZATION_HEADER_SIZE;
fileout << blockundo;
{
HashWriter hasher;
hasher << block.pprev->GetBlockHash();
hasher << blockundo;
// calculate & write checksum
HashWriter hasher{};
hasher << block.pprev->GetBlockHash();
hasher << blockundo;
fileout << hasher.GetHash();
DataStream undo_data;
undo_data.reserve(blockundo_size + sizeof(uint256));
undo_data << blockundo << hasher.GetHash();
util::Xor(undo_data, m_xor_key, pos.nPos);
fileout.write(undo_data);
}
// rev files are written in block height order, whereas blk files are written as blocks come in (often out of order)
// we want to flush the rev (undo) file once we've written the last block, which is indicated by the last height
@ -1105,21 +1112,34 @@ bool BlockManager::ReadRawBlockFromDisk(std::vector<uint8_t>& block, const FlatF
FlatFilePos BlockManager::SaveBlock(const CBlock& block, int nHeight)
{
const uint32_t block_size{static_cast<uint32_t>(GetSerializeSize(TX_WITH_WITNESS(block)))};
FlatFilePos pos{FindNextBlockPos(block_size + BLOCK_SERIALIZATION_HEADER_SIZE, nHeight, block.GetBlockTime())};
FlatFilePos pos{FindNextBlockPos(BLOCK_SERIALIZATION_HEADER_SIZE + block_size, nHeight, block.GetBlockTime())};
if (pos.IsNull()) {
LogError("%s: FindNextBlockPos failed\n", __func__);
return FlatFilePos();
}
AutoFile fileout{OpenBlockFile(pos)};
AutoFile fileout{m_block_file_seq.Open(pos, false), {}}; // We'll obfuscate ourselves
if (fileout.IsNull()) {
LogError("%s: OpenBlockFile failed\n", __func__);
m_opts.notifications.fatalError(_("Failed to write block."));
return FlatFilePos();
}
fileout << GetParams().MessageStart() << block_size;
{
DataStream header;
header.reserve(BLOCK_SERIALIZATION_HEADER_SIZE);
header << GetParams().MessageStart() << block_size;
util::Xor(header, m_xor_key, pos.nPos);
fileout.write(header);
}
pos.nPos += BLOCK_SERIALIZATION_HEADER_SIZE;
fileout << TX_WITH_WITNESS(block);
{
DataStream block_data;
block_data.reserve(block_size);
block_data << TX_WITH_WITNESS(block);
util::Xor(block_data, m_xor_key, pos.nPos);
fileout.write(block_data);
}
return pos;
}