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Marking fraction of already checked keys as searched

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This commit is contained in:
armin 2018-04-27 23:38:52 +02:00
parent 1e149be221
commit 1e2b04a75c
5 changed files with 67 additions and 11 deletions
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2
bfclient/src/bfclient.cpp
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@ -35,7 +35,7 @@ int main() {
thread* threads = new thread[numThreads];
cout << "Starting " << numThreads << " threads" << endl;
numThreads = 1;
//numThreads = 1;
for (unsigned int i = 0; i < numThreads; i++) {
threads[i] = thread{bf::Brainflyer(i, "127.0.0.1", 26765, key)};
}

6
cnc/src/main/java/org/btcollider/cnc/CnC.java
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@ -15,19 +15,19 @@ import org.slf4j.LoggerFactory;
*
*/
public class CnC {
final static Logger log = LoggerFactory.getLogger(CnC.class);
static final Logger log = LoggerFactory.getLogger(CnC.class);
public static final int PORT = 26765;
// Invariant: positive long (2^63-1) must be able to hold all bits handled here
public static final int MAX_BITS = 62;
public static void main(String[] args) {
KeyServer kts = KSFactory.build(54, 30, 90, TimeUnit.MINUTES);
KeyServer kts = KSFactory.build(54, 30, 90, TimeUnit.MINUTES, 0.62f);
CommServer server = new CommServer(PORT, kts);
try {
server.listen();
} catch (CommException e) {
log.error("CommServer couldn't be started");
log.error("CommServer couldn't be started", e);
} finally {
server.stop();
}

25
cnc/src/main/java/org/btcollider/cnc/keysrv/KSFactory.java
View file

@ -6,11 +6,30 @@ import org.btcollider.cnc.keysrv.impl.keytree.KeyTreeServer;
import org.btcollider.cnc.keysrv.impl.multistage.MultiStagedServer;
public class KSFactory {
public static KeyServer build(int index, int depth, long maxWorkSpan) {
return build(index, depth, maxWorkSpan, TimeUnit.MILLISECONDS);
}
public static KeyServer build(int index, int depth, long maxWorkSpan, TimeUnit timeUnit) {
return build(index, depth, maxWorkSpan, timeUnit, 0);
}
public static KeyServer build(int index, int depth, long maxWorkSpan, TimeUnit timeUnit, float pruneFraction) {
assert (pruneFraction >= 0.0 && pruneFraction <= 1.0);
long maxKey = ((long) 1 << index) | (( (long) 1 << index) - 1);
long pruneKey = (long) Math.floor(maxKey * pruneFraction);
return build(index, depth, maxWorkSpan, timeUnit, pruneKey);
}
public static KeyServer build(int index, int depth, long maxWorkSpan, TimeUnit timeUnit, long pruneKey) {
if (depth == 25) {
return new KeyTreeServer(index, depth, timeUnit.toMillis(maxWorkSpan));
return new KeyTreeServer(index, depth, timeUnit.toMillis(maxWorkSpan), pruneKey);
} else {
return new MultiStagedServer(index, depth, timeUnit.toMillis(maxWorkSpan));
}
return new MultiStagedServer(index, depth, timeUnit.toMillis(maxWorkSpan), pruneKey);
}
}
}

38
cnc/src/main/java/org/btcollider/cnc/keysrv/impl/keytree/KeyTreeServer.java
View file

@ -21,7 +21,7 @@ public class KeyTreeServer implements KeyServer {
private int index;
private int depth;
public KeyTreeServer(int index, int depth, long maxWorkSpan) {
public KeyTreeServer(int index, int depth, long maxWorkSpan, long pruneKey) {
assert Math.pow(2, CnC.MAX_BITS) <= Long.MAX_VALUE;
assert index < CnC.MAX_BITS && depth <= CnC.MAX_BITS;
@ -29,6 +29,8 @@ public class KeyTreeServer implements KeyServer {
this.index = index;
this.root = generateKeyTree(depth);
if (pruneKey > 0) prune(pruneKey);
if (maxWorkSpan > 0) {
log.info("Starting KeyTree concierge");
ScheduledExecutorService es = Executors.newSingleThreadScheduledExecutor();
@ -113,6 +115,40 @@ public class KeyTreeServer implements KeyServer {
return nodeName;
}
/**
* Prunes every branch strictly smaller than pruneKey
*
* @param prune
* The smallest valid key in the keyspace Must be at least as large
* as the smallest key in the tree Must be at most as large as the
* largest key in the tree
*/
private void prune(Long pruneKey) {
BitSet pkBS = BitSet.valueOf(new long[] { pruneKey });
int curIdx = pkBS.length() - 1;
assert (curIdx == this.index); // at least the smallest, at most the largest key in the tree
// -> pos of highest bits is equal
recPrune(pkBS, this.root, curIdx);
}
private void recPrune(BitSet pruneKey, KeyTree node, int curIdx) {
if (node.getValue() && !pruneKey.get(curIdx)) { // node[ix] = 0 and pruneK[ix] = 1 -> path smaller
node.setSearched(true);
return;
} else if (!node.getValue() && pruneKey.get(curIdx)) { // node[ix] = 1 and pruneK[ix] = 0 -> path
return;
}
if (node.isLeaf()) { // end reached
assert (curIdx == 0);
return;
}
recPrune(pruneKey, node.getLeft(), curIdx-1);
recPrune(pruneKey, node.getRight(), curIdx-1);
}
private void markInWork(BitSet key) {
KeyTree keyTreePointer = root;

9
cnc/src/main/java/org/btcollider/cnc/keysrv/impl/multistage/MultiStagedServer.java
View file

@ -25,21 +25,22 @@ public class MultiStagedServer implements KeyServer {
private int subIndex;
private long maxWorkSpan;
public MultiStagedServer(int index, int depth, long maxWorkSpan) {
public MultiStagedServer(int index, int depth, long maxWorkSpan, long pruneKey) {
this.remainingDepth = depth - PARTITION_DEPTH;
this.subIndex = index - PARTITION_DEPTH;
this.maxWorkSpan = maxWorkSpan;
// Build a reasonably sized KeyTreeServer with disabled KTConcierge service
// This represents the first partitioning of the key space
this.primKTS = new KeyTreeServer(index, PARTITION_DEPTH, 0);
this.primKTS = new KeyTreeServer(index, PARTITION_DEPTH, 0, pruneKey);
// Get a random starting range from the primary KTS, this range is still too huge
this.partition = primKTS.getRange();
// Start a secondary KTS to partition remaining key space in currentRange
// This represents the actual work-horse KeyTreeServer for the current partition with
// enabled KTConcierge service.
// Needs subindex+1 because starting bit always set to 1
this.secKTS = new KeyTreeServer(subIndex+1, remainingDepth, maxWorkSpan);
long subPrune = ((long) 1 << subIndex+1) | ( (((long) 1 << subIndex+1) - 1) & pruneKey );
this.secKTS = new KeyTreeServer(subIndex+1, remainingDepth, maxWorkSpan, subPrune);
this.keyRangeBuffer = new KeyRangeBuffer(maxWorkSpan);
}
@ -58,7 +59,7 @@ public class MultiStagedServer implements KeyServer {
log.info("Subrange {} finished. Opening new partition.", partition);
primKTS.setSearched(partition);
partition = primKTS.getRange();
secKTS = new KeyTreeServer(subIndex+1, remainingDepth, maxWorkSpan);
secKTS = new KeyTreeServer(subIndex+1, remainingDepth, maxWorkSpan, 0);
return getRange();
}