HW2: done Ex2
This commit is contained in:
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@ -2,9 +2,13 @@
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@ -55,7 +59,7 @@
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</component>
|
||||
<component name="RecentsManager">
|
||||
<key name="MoveFile.RECENT_KEYS">
|
||||
<recent name="$PROJECT_DIR$" />
|
||||
</key>
|
||||
</component>
|
||||
<component name="RunDashboard">
|
||||
<option name="ruleStates">
|
||||
<list>
|
||||
<RuleState>
|
||||
<option name="name" value="ConfigurationTypeDashboardGroupingRule" />
|
||||
</RuleState>
|
||||
<RuleState>
|
||||
<option name="name" value="StatusDashboardGroupingRule" />
|
||||
</RuleState>
|
||||
</list>
|
||||
</option>
|
||||
</component>
|
||||
<component name="RunManager">
|
||||
<configuration name="Tester" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
|
||||
<option name="MAIN_CLASS_NAME" value="Tester" />
|
||||
<module name="Ex2" />
|
||||
<method v="2">
|
||||
<option name="Make" enabled="true" />
|
||||
</method>
|
||||
</configuration>
|
||||
<recent_temporary>
|
||||
<list>
|
||||
<item itemvalue="Application.Tester" />
|
||||
</list>
|
||||
</recent_temporary>
|
||||
</component>
|
||||
<component name="SvnConfiguration">
|
||||
<configuration />
|
||||
</component>
|
||||
<component name="TaskManager">
|
||||
<task active="true" id="Default" summary="Default task">
|
||||
<changelist id="19fb80a5-3326-4689-b0ba-ecd6ab32d599" name="Default Changelist" comment="" />
|
||||
<created>1573415904376</created>
|
||||
<option name="number" value="Default" />
|
||||
<option name="presentableId" value="Default" />
|
||||
<updated>1573415904376</updated>
|
||||
<workItem from="1573415905557" duration="151000" />
|
||||
<workItem from="1573416086677" duration="1451000" />
|
||||
</task>
|
||||
<servers />
|
||||
</component>
|
||||
<component name="TimeTrackingManager">
|
||||
<option name="totallyTimeSpent" value="1602000" />
|
||||
</component>
|
||||
<component name="ToolWindowManager">
|
||||
<frame x="0" y="0" width="1680" height="1050" extended-state="0" />
|
||||
<editor active="true" />
|
||||
<layout>
|
||||
<window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.25274727" />
|
||||
<window_info id="Structure" order="1" side_tool="true" weight="0.25" />
|
||||
<window_info id="Designer" order="2" />
|
||||
<window_info id="Image Layers" order="3" />
|
||||
<window_info id="Capture Tool" order="4" />
|
||||
<window_info id="UI Designer" order="5" />
|
||||
<window_info id="Learn" order="6" />
|
||||
<window_info id="Favorites" order="7" side_tool="true" />
|
||||
<window_info anchor="bottom" id="Messages" weight="0.32959184" />
|
||||
<window_info anchor="bottom" id="Message" order="0" />
|
||||
<window_info anchor="bottom" id="Find" order="1" weight="0.32959184" />
|
||||
<window_info active="true" anchor="bottom" id="Run" order="2" visible="true" weight="0.32959184" />
|
||||
<window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
|
||||
<window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
|
||||
<window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
|
||||
<window_info anchor="bottom" id="TODO" order="6" />
|
||||
<window_info anchor="bottom" id="Docker" order="7" show_stripe_button="false" />
|
||||
<window_info anchor="bottom" id="Version Control" order="8" />
|
||||
<window_info anchor="bottom" id="Database Changes" order="9" />
|
||||
<window_info anchor="bottom" id="Terminal" order="10" />
|
||||
<window_info anchor="bottom" id="Event Log" order="11" side_tool="true" />
|
||||
<window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
|
||||
<window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
|
||||
<window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
|
||||
<window_info anchor="right" id="Palette" order="3" />
|
||||
<window_info anchor="right" id="Theme Preview" order="4" />
|
||||
<window_info anchor="right" id="Maven" order="5" />
|
||||
<window_info anchor="right" id="Capture Analysis" order="6" />
|
||||
<window_info anchor="right" id="Palette	" order="7" />
|
||||
<window_info anchor="right" id="Database" order="8" />
|
||||
</layout>
|
||||
</component>
|
||||
<component name="TypeScriptGeneratedFilesManager">
|
||||
<option name="version" value="1" />
|
||||
</component>
|
||||
<component name="editorHistoryManager">
|
||||
<entry file="file://$PROJECT_DIR$/src/VoteCounter.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="30">
|
||||
<caret line="2" column="4" selection-start-line="2" selection-start-column="4" selection-end-line="2" selection-end-column="4" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Tester.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="30">
|
||||
<caret line="2" column="14" selection-start-line="2" selection-start-column="14" selection-end-line="2" selection-end-column="14" />
|
||||
<folding>
|
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<element signature="e#441#442#0" expanded="true" />
|
||||
<element signature="e#478#479#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/ConcurrentVoteCounter.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="165">
|
||||
<caret line="11" column="64" selection-start-line="11" selection-start-column="64" selection-end-line="11" selection-end-column="64" />
|
||||
<folding>
|
||||
<element signature="imports" expanded="true" />
|
||||
<element signature="e#454#455#0" expanded="true" />
|
||||
<element signature="e#500#501#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</component>
|
||||
<component name="masterDetails">
|
||||
<states>
|
||||
<state key="ArtifactsStructureConfigurable.UI">
|
||||
<settings>
|
||||
<artifact-editor />
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="FacetStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>No facets are configured</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="GlobalLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="JdkListConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ModuleStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>Ex2</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
<option value="0.6" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ProjectLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
</states>
|
||||
</component>
|
||||
</project>
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
import java.util.concurrent.ConcurrentHashMap;
|
||||
import java.util.concurrent.ConcurrentMap;
|
||||
import java.util.concurrent.atomic.AtomicInteger;
|
||||
|
||||
public class ConcurrentVoteCounter implements VoteCounter {
|
||||
private final ConcurrentMap<Integer, AtomicInteger> electionResults = new ConcurrentHashMap<>();
|
||||
|
||||
public void addVote(Integer id) {
|
||||
// Alternative implementation (using plain Integers, slower due to synchronization costs):
|
||||
// electionResults.compute(id, (k, v) -> v != null ? v + 1 : 1);
|
||||
|
||||
// Faster version due to architecture-level optimization
|
||||
electionResults.putIfAbsent(id, new AtomicInteger(0));
|
||||
electionResults.get(id).addAndGet(1);
|
||||
}
|
||||
|
||||
public Integer getVoteCount(Integer id) {
|
||||
return electionResults.get(id).intValue();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,93 @@
|
|||
import java.util.concurrent.CountDownLatch;
|
||||
|
||||
public class Tester {
|
||||
|
||||
private static final int NUM_THREADS = 1024;
|
||||
private static final int NUM_ITERATIONS = 64;
|
||||
private static final int OCCUR = 32;
|
||||
private final VoteCounter counter;
|
||||
private final CountDownLatch threadsReady,
|
||||
measurementStarted, threadsCompleted;
|
||||
|
||||
private class TesterThread extends Thread {
|
||||
|
||||
private final int startValue;
|
||||
|
||||
TesterThread(int startValue) {
|
||||
this.startValue = startValue;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
int iter = NUM_ITERATIONS * OCCUR;
|
||||
int nextValue = startValue;
|
||||
|
||||
threadsReady.countDown();
|
||||
|
||||
try {
|
||||
measurementStarted.await();
|
||||
}
|
||||
catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
System.exit(1);
|
||||
}
|
||||
|
||||
for (int i = 0; i < iter; i++) {
|
||||
counter.addVote(nextValue);
|
||||
nextValue = (nextValue + 1) % NUM_ITERATIONS;
|
||||
}
|
||||
|
||||
threadsCompleted.countDown();
|
||||
}
|
||||
}
|
||||
|
||||
public Tester(VoteCounter counter) {
|
||||
this.counter = counter;
|
||||
this.threadsReady = new CountDownLatch(NUM_THREADS);
|
||||
this.measurementStarted = new CountDownLatch(1);
|
||||
this.threadsCompleted = new CountDownLatch(NUM_THREADS);
|
||||
}
|
||||
|
||||
private long runMeasurement() throws InterruptedException {
|
||||
for (int i = 0; i < NUM_THREADS; ++i) {
|
||||
Thread t = new TesterThread( NUM_ITERATIONS / 2);
|
||||
t.start();
|
||||
}
|
||||
|
||||
threadsReady.await();
|
||||
long timeBegin = System.nanoTime();
|
||||
|
||||
measurementStarted.countDown();
|
||||
|
||||
threadsCompleted.await();
|
||||
long timeEnd = System.nanoTime();
|
||||
|
||||
return timeEnd - timeBegin;
|
||||
}
|
||||
|
||||
private void check() {
|
||||
int expectedOccur = OCCUR * NUM_THREADS;
|
||||
for (int i = 0; i < NUM_ITERATIONS; i++) {
|
||||
int foundOccur;
|
||||
if ((foundOccur = counter.getVoteCount(i)) != expectedOccur) {
|
||||
System.err.printf(" - ERROR: Expected: %d ; Found: %d\n",
|
||||
expectedOccur, foundOccur);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private static void testImplementation(ConcurrentVoteCounter implementation,
|
||||
String name) throws Exception {
|
||||
|
||||
System.out.println("Results for implementation: " + name);
|
||||
Tester tester = new Tester(implementation);
|
||||
long elapsedTime = tester.runMeasurement();
|
||||
tester.check();
|
||||
System.out.printf(" - Test completed, elapsed time: %d ms\n",
|
||||
(elapsedTime / 1000000));
|
||||
}
|
||||
|
||||
public static void main(String[] args) throws Exception {
|
||||
//testImplementation(new BinTreeSimple(), "Simple version");
|
||||
testImplementation(new ConcurrentVoteCounter(), "Concurrent version (correct)");
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
public interface VoteCounter {
|
||||
void addVote(Integer id);
|
||||
Integer getVoteCount(Integer id);
|
||||
}
|
||||
|
|
@ -18,6 +18,18 @@ I have implemented the class \texttt{BinTreeFullSync}
|
|||
as a thread-safe alternative of \texttt{BinTreeSimple} where the only code modification between the two were the addition of \texttt{synchronized} keywords on already existing threads. Since I was not sure how to interpret this specific question, I have implemented \texttt{BinTreeFullSyncEdited}, a thread-safe refactoring of \texttt{BinTreeSimple} where the only synchronization mechanism is method-level \texttt{synchronized} blocks, which are used on new methods created in the subclass \texttt{Node}.
|
||||
|
||||
\subsection{Question 5}
|
||||
\texttt{BinTreeFullSync} has the worst performance of all 3 implementations since it allows only sequential access to the tree structure. \texttt{BinTreeFullSyncEdited} is slightly faster, but \texttt{BinTreeCAS} is the fastest since the first one is a \texttt{synchronized} block imitation of the second one, which is instead based on \texttt{Atomic*} objects and can use the extra speed provided by architecture-based optimization.
|
||||
\texttt{BinTreeFullSync} has the worst performance of all 3 implementations since it allows only sequential access to the tree structure. \texttt{BinTreeFullSyncEdited} is slightly faster, but \texttt{BinTreeCAS} is the fastest since the first one is a \texttt{synchronized} block imitation of the second one, which is instead based on \texttt{Atomic*} objects and can use the extra speed provided by architecture based optimization.
|
||||
|
||||
\section{Exercise 2}
|
||||
\subsection{Question 1}
|
||||
\texttt{SimpleVoteCounter} behaves incorrectly since its implementation is not thread-safe: the \texttt{Map} implementation is not thread-safe, and the \texttt{addVote(Integer)} method is also not thread safe since its operation of access, conditional computation and storage is not atomic nor synchronized.
|
||||
|
||||
\subsection{Question 2}
|
||||
\texttt{SyncMapVoteCounter} is still not thread safe since \texttt{addVote(Integer)} is still not synchronized. This means that two threads may assess that a candidate has no vote at almost the same time and count the first vote twice.
|
||||
|
||||
\subsection{Question 3}
|
||||
\texttt{LockVoteCounter} is thread safe since only a thread at a time can either add a vote or get the votes for a candidate. However, this type of synchronization is inefficient since concurrent accesses to the number of votes of a candidate are safe if no other thread is casting a vote.
|
||||
|
||||
\subsection{Question 4}
|
||||
As with \texttt{SyncMapVoteCounter}, \texttt{ConcurrentVoteCounter} is not thread safe since the operation of casting a vote is not atomic nor synchronized.
|
||||
\end{document}
|
||||
|
|
|
|||
Reference in New Issue