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Remove unneeded locking #499

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debris merged 12 commits into from
Mar 11, 2016
Merged

Remove unneeded locking #499

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c8076b2
Threading performance optimizations
arkpar Feb 21, 2016
778fa92
Remove locks from the block chain
arkpar Feb 21, 2016
08d54f9
Merge branch 'master' of github.com:ethcore/parity into thread
arkpar Feb 26, 2016
0ccbba9
Merge branch 'master' of github.com:ethcore/parity into thread
arkpar Feb 29, 2016
dff7f2e
Merge branch 'master' of github.com:ethcore/parity into thread
arkpar Feb 29, 2016
cb4d178
Fixed lock order
arkpar Feb 29, 2016
d0129ff
Fixed cache memory leak
arkpar Feb 29, 2016
15ecba5
Merge branch 'master' of github.com:ethcore/parity into thread
arkpar Mar 2, 2016
324e070
Reverted some changes
arkpar Mar 2, 2016
57485a7
Merge branch 'master' into thread
arkpar Mar 7, 2016
a6b5aad
Merge branch 'master' of github.com:ethcore/parity into thread
arkpar Mar 10, 2016
5f37f6e
Correct cache update order
arkpar Mar 10, 2016
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4 changes: 4 additions & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -44,3 +44,7 @@ travis-nightly = ["ethcore/json-tests", "dev-clippy", "dev"]
[[bin]]
path = "parity/main.rs"
name = "parity"

[profile.release]
debug = false
lto = false
178 changes: 99 additions & 79 deletions ethcore/src/block_queue.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -95,7 +95,7 @@ pub struct BlockQueue {
panic_handler: Arc<PanicHandler>,
engine: Arc<Box<Engine>>,
more_to_verify: Arc<Condvar>,
verification: Arc<Mutex<Verification>>,
verification: Arc<Verification>,
verifiers: Vec<JoinHandle<()>>,
deleting: Arc<AtomicBool>,
ready_signal: Arc<QueueSignal>,
Expand Down Expand Up @@ -132,18 +132,23 @@ impl QueueSignal {
}
}

#[derive(Default)]
struct Verification {
unverified: VecDeque<UnverifiedBlock>,
verified: VecDeque<PreverifiedBlock>,
verifying: VecDeque<VerifyingBlock>,
bad: HashSet<H256>,
// All locks must be captured in the order declared here.
unverified: Mutex<VecDeque<UnverifiedBlock>>,
verified: Mutex<VecDeque<PreverifiedBlock>>,
verifying: Mutex<VecDeque<VerifyingBlock>>,
bad: Mutex<HashSet<H256>>,
}

impl BlockQueue {
/// Creates a new queue instance.
pub fn new(config: BlockQueueConfig, engine: Arc<Box<Engine>>, message_channel: IoChannel<NetSyncMessage>) -> BlockQueue {
let verification = Arc::new(Mutex::new(Verification::default()));
let verification = Arc::new(Verification {
unverified: Mutex::new(VecDeque::new()),
verified: Mutex::new(VecDeque::new()),
verifying: Mutex::new(VecDeque::new()),
bad: Mutex::new(HashSet::new()),
});
let more_to_verify = Arc::new(Condvar::new());
let ready_signal = Arc::new(QueueSignal { signalled: AtomicBool::new(false), message_channel: message_channel });
let deleting = Arc::new(AtomicBool::new(false));
Expand Down Expand Up @@ -186,17 +191,17 @@ impl BlockQueue {
}
}

fn verify(verification: Arc<Mutex<Verification>>, engine: Arc<Box<Engine>>, wait: Arc<Condvar>, ready: Arc<QueueSignal>, deleting: Arc<AtomicBool>, empty: Arc<Condvar>) {
fn verify(verification: Arc<Verification>, engine: Arc<Box<Engine>>, wait: Arc<Condvar>, ready: Arc<QueueSignal>, deleting: Arc<AtomicBool>, empty: Arc<Condvar>) {
while !deleting.load(AtomicOrdering::Acquire) {
{
let mut lock = verification.lock().unwrap();
let mut unverified = verification.unverified.lock().unwrap();

if lock.unverified.is_empty() && lock.verifying.is_empty() {
if unverified.is_empty() && verification.verifying.lock().unwrap().is_empty() {
empty.notify_all();
}

while lock.unverified.is_empty() && !deleting.load(AtomicOrdering::Acquire) {
lock = wait.wait(lock).unwrap();
while unverified.is_empty() && !deleting.load(AtomicOrdering::Acquire) {
unverified = wait.wait(unverified).unwrap();
}

if deleting.load(AtomicOrdering::Acquire) {
Expand All @@ -205,39 +210,42 @@ impl BlockQueue {
}

let block = {
let mut v = verification.lock().unwrap();
if v.unverified.is_empty() {
let mut unverified = verification.unverified.lock().unwrap();
if unverified.is_empty() {
continue;
}
let block = v.unverified.pop_front().unwrap();
v.verifying.push_back(VerifyingBlock{ hash: block.header.hash(), block: None });
let mut verifying = verification.verifying.lock().unwrap();
let block = unverified.pop_front().unwrap();
verifying.push_back(VerifyingBlock{ hash: block.header.hash(), block: None });
block
};

let block_hash = block.header.hash();
match verify_block_unordered(block.header, block.bytes, engine.deref().deref()) {
Ok(verified) => {
let mut v = verification.lock().unwrap();
for e in &mut v.verifying {
let mut verifying = verification.verifying.lock().unwrap();
for e in verifying.iter_mut() {
if e.hash == block_hash {
e.block = Some(verified);
break;
}
}
if !v.verifying.is_empty() && v.verifying.front().unwrap().hash == block_hash {
if !verifying.is_empty() && verifying.front().unwrap().hash == block_hash {
// we're next!
let mut vref = v.deref_mut();
BlockQueue::drain_verifying(&mut vref.verifying, &mut vref.verified, &mut vref.bad);
let mut verified = verification.verified.lock().unwrap();
let mut bad = verification.bad.lock().unwrap();
BlockQueue::drain_verifying(&mut verifying, &mut verified, &mut bad);
ready.set();
}
},
Err(err) => {
let mut v = verification.lock().unwrap();
let mut verifying = verification.verifying.lock().unwrap();
let mut verified = verification.verified.lock().unwrap();
let mut bad = verification.bad.lock().unwrap();
warn!(target: "client", "Stage 2 block verification failed for {}\nError: {:?}", block_hash, err);
v.bad.insert(block_hash.clone());
v.verifying.retain(|e| e.hash != block_hash);
let mut vref = v.deref_mut();
BlockQueue::drain_verifying(&mut vref.verifying, &mut vref.verified, &mut vref.bad);
bad.insert(block_hash.clone());
verifying.retain(|e| e.hash != block_hash);
BlockQueue::drain_verifying(&mut verifying, &mut verified, &mut bad);
ready.set();
}
}
Expand All @@ -257,19 +265,21 @@ impl BlockQueue {
}

/// Clear the queue and stop verification activity.
pub fn clear(&mut self) {
let mut verification = self.verification.lock().unwrap();
verification.unverified.clear();
verification.verifying.clear();
verification.verified.clear();
pub fn clear(&self) {
let mut unverified = self.verification.unverified.lock().unwrap();
let mut verifying = self.verification.verifying.lock().unwrap();
let mut verified = self.verification.verified.lock().unwrap();
unverified.clear();
verifying.clear();
verified.clear();
self.processing.write().unwrap().clear();
}

/// Wait for queue to be empty
pub fn flush(&mut self) {
let mut verification = self.verification.lock().unwrap();
while !verification.unverified.is_empty() || !verification.verifying.is_empty() {
verification = self.empty.wait(verification).unwrap();
/// Wait for unverified queue to be empty
pub fn flush(&self) {
let mut unverified = self.verification.unverified.lock().unwrap();
while !unverified.is_empty() || !self.verification.verifying.lock().unwrap().is_empty() {
unverified = self.empty.wait(unverified).unwrap();
}
}

Expand All @@ -278,76 +288,76 @@ impl BlockQueue {
if self.processing.read().unwrap().contains(&hash) {
return BlockStatus::Queued;
}
if self.verification.lock().unwrap().bad.contains(&hash) {
if self.verification.bad.lock().unwrap().contains(&hash) {
return BlockStatus::Bad;
}
BlockStatus::Unknown
}

/// Add a block to the queue.
pub fn import_block(&mut self, bytes: Bytes) -> ImportResult {
pub fn import_block(&self, bytes: Bytes) -> ImportResult {
let header = BlockView::new(&bytes).header();
let h = header.hash();
if self.processing.read().unwrap().contains(&h) {
return Err(x!(ImportError::AlreadyQueued));
}
{
let mut verification = self.verification.lock().unwrap();
if verification.bad.contains(&h) {
if self.processing.read().unwrap().contains(&h) {
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@NikVolf NikVolf Mar 1, 2016

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Any rational explanation of introducing this block around if expression?

return Err(x!(ImportError::AlreadyQueued));
}

let mut bad = self.verification.bad.lock().unwrap();
if bad.contains(&h) {
return Err(x!(ImportError::KnownBad));
}

if verification.bad.contains(&header.parent_hash) {
verification.bad.insert(h.clone());
if bad.contains(&header.parent_hash) {
bad.insert(h.clone());
return Err(x!(ImportError::KnownBad));
}
}

match verify_block_basic(&header, &bytes, self.engine.deref().deref()) {
Ok(()) => {
self.processing.write().unwrap().insert(h.clone());
self.verification.lock().unwrap().unverified.push_back(UnverifiedBlock { header: header, bytes: bytes });
self.verification.unverified.lock().unwrap().push_back(UnverifiedBlock { header: header, bytes: bytes });
self.more_to_verify.notify_all();
Ok(h)
},
Err(err) => {
warn!(target: "client", "Stage 1 block verification failed for {}\nError: {:?}", BlockView::new(&bytes).header_view().sha3(), err);
self.verification.lock().unwrap().bad.insert(h.clone());
self.verification.bad.lock().unwrap().insert(h.clone());
Err(err)
}
}
}

/// Mark given block and all its children as bad. Stops verification.
pub fn mark_as_bad(&mut self, block_hashes: &[H256]) {
pub fn mark_as_bad(&self, block_hashes: &[H256]) {
if block_hashes.is_empty() {
return;
}
let mut verification_lock = self.verification.lock().unwrap();
let mut verified_lock = self.verification.verified.lock().unwrap();
let mut verified = verified_lock.deref_mut();
let mut bad = self.verification.bad.lock().unwrap();
let mut processing = self.processing.write().unwrap();

let mut verification = verification_lock.deref_mut();

verification.bad.reserve(block_hashes.len());
bad.reserve(block_hashes.len());
for hash in block_hashes {
verification.bad.insert(hash.clone());
bad.insert(hash.clone());
processing.remove(&hash);
}

let mut new_verified = VecDeque::new();
for block in verification.verified.drain(..) {
if verification.bad.contains(&block.header.parent_hash) {
verification.bad.insert(block.header.hash());
for block in verified.drain(..) {
if bad.contains(&block.header.parent_hash) {
bad.insert(block.header.hash());
processing.remove(&block.header.hash());
} else {
new_verified.push_back(block);
}
}
verification.verified = new_verified;
*verified = new_verified;
}

/// Mark given block as processed
pub fn mark_as_good(&mut self, block_hashes: &[H256]) {
pub fn mark_as_good(&self, block_hashes: &[H256]) {
if block_hashes.is_empty() {
return;
}
Expand All @@ -358,45 +368,55 @@ impl BlockQueue {
}

/// Removes up to `max` verified blocks from the queue
pub fn drain(&mut self, max: usize) -> Vec<PreverifiedBlock> {
let mut verification = self.verification.lock().unwrap();
let count = min(max, verification.verified.len());
pub fn drain(&self, max: usize) -> Vec<PreverifiedBlock> {
let mut verified = self.verification.verified.lock().unwrap();
let count = min(max, verified.len());
let mut result = Vec::with_capacity(count);
for _ in 0..count {
let block = verification.verified.pop_front().unwrap();
let block = verified.pop_front().unwrap();
result.push(block);
}
self.ready_signal.reset();
if !verification.verified.is_empty() {
if !verified.is_empty() {
self.ready_signal.set();
}
result
}

/// Get queue status.
pub fn queue_info(&self) -> BlockQueueInfo {
let verification = self.verification.lock().unwrap();
let (unverified_len, unverified_bytes) = {
let v = self.verification.unverified.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
let (verifying_len, verifying_bytes) = {
let v = self.verification.verifying.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
let (verified_len, verified_bytes) = {
let v = self.verification.verified.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
BlockQueueInfo {
verified_queue_size: verification.verified.len(),
unverified_queue_size: verification.unverified.len(),
verifying_queue_size: verification.verifying.len(),
unverified_queue_size: unverified_len,
verifying_queue_size: verifying_len,
verified_queue_size: verified_len,
max_queue_size: self.max_queue_size,
max_mem_use: self.max_mem_use,
mem_used:
verification.unverified.heap_size_of_children()
+ verification.verifying.heap_size_of_children()
+ verification.verified.heap_size_of_children(),
unverified_bytes
+ verifying_bytes
+ verified_bytes
// TODO: https://github.com/servo/heapsize/pull/50
//+ self.processing.read().unwrap().heap_size_of_children(),
}
}

pub fn collect_garbage(&self) {
{
let mut verification = self.verification.lock().unwrap();
verification.unverified.shrink_to_fit();
verification.verifying.shrink_to_fit();
verification.verified.shrink_to_fit();
self.verification.unverified.lock().unwrap().shrink_to_fit();
self.verification.verifying.lock().unwrap().shrink_to_fit();
self.verification.verified.lock().unwrap().shrink_to_fit();
}
self.processing.write().unwrap().shrink_to_fit();
}
Expand Down Expand Up @@ -444,15 +464,15 @@ mod tests {

#[test]
fn can_import_blocks() {
let mut queue = get_test_queue();
let queue = get_test_queue();
if let Err(e) = queue.import_block(get_good_dummy_block()) {
panic!("error importing block that is valid by definition({:?})", e);
}
}

#[test]
fn returns_error_for_duplicates() {
let mut queue = get_test_queue();
let queue = get_test_queue();
if let Err(e) = queue.import_block(get_good_dummy_block()) {
panic!("error importing block that is valid by definition({:?})", e);
}
Expand All @@ -471,7 +491,7 @@ mod tests {

#[test]
fn returns_ok_for_drained_duplicates() {
let mut queue = get_test_queue();
let queue = get_test_queue();
let block = get_good_dummy_block();
let hash = BlockView::new(&block).header().hash().clone();
if let Err(e) = queue.import_block(block) {
Expand All @@ -488,7 +508,7 @@ mod tests {

#[test]
fn returns_empty_once_finished() {
let mut queue = get_test_queue();
let queue = get_test_queue();
queue.import_block(get_good_dummy_block()).expect("error importing block that is valid by definition");
queue.flush();
queue.drain(1);
Expand Down
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