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cs440-acg/ext/tbb/examples/concurrent_priority_queue/index.html
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cs440-acg/ext/tbb/examples/concurrent_priority_queue/index.html
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<title>Intel® Threading Building Blocks. Samples on concurrent_priority_queue container</title>
|
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</head>
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9Or1LzUmVVz+HJXDAAAAAElFTkSuQmCC">
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||||
<h1 class="title">Intel® Threading Building Blocks.<br>Samples on <code>concurrent_priority_queue</code> container</h1>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
This directory has examples of the <code>concurrent_priority_queue</code> container.
|
||||
</p>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Directories</div>
|
||||
<input type="checkbox" checked="checked">
|
||||
<div class="show-hide">
|
||||
<dl>
|
||||
<dt><a href="shortpath/readme.html">shortpath</a>
|
||||
<dd>Solves the single source shortest path problem using a <code>concurrent_priority_queue</code> container.
|
||||
</dl>
|
||||
</div>
|
||||
</div>
|
||||
<br>
|
||||
<a href="../index.html">Up to parent directory</a>
|
||||
<hr>
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Legal Information:</div>
|
||||
<input type="checkbox">
|
||||
<div class="show-hide">
|
||||
<p>
|
||||
Intel and the Intel logo are trademarks of Intel Corporation in the U.S. and/or other countries.
|
||||
<br>* Other names and brands may be claimed as the property of others.
|
||||
<br>© 2020, Intel Corporation
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -0,0 +1,46 @@
|
||||
# Copyright (c) 2005-2020 Intel Corporation
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
# Common Makefile that builds and runs example.
|
||||
|
||||
# Just specify your program basename
|
||||
PROG=shortpath
|
||||
ARGS=4 N=1000 start=0 end=999 verbose
|
||||
PERF_RUN_ARGS=auto N=1000 start=0 end=99 silent
|
||||
|
||||
# Trying to find if icl.exe is set
|
||||
CXX1 = $(TBB_CXX)-
|
||||
CXX2 = $(CXX1:icl.exe-=icl.exe)
|
||||
CXX = $(CXX2:-=cl.exe)
|
||||
|
||||
# The C++ compiler options
|
||||
MYCXXFLAGS = /TP /EHsc /W3 /nologo /D _CONSOLE /D _MBCS /D WIN32 /D _CRT_SECURE_NO_DEPRECATE $(CXXFLAGS)
|
||||
MYLDFLAGS =/INCREMENTAL:NO /NOLOGO /DEBUG /FIXED:NO $(LDFLAGS)
|
||||
|
||||
all: release test
|
||||
release:
|
||||
$(CXX) *.cpp /MD /O2 /D NDEBUG $(MYCXXFLAGS) /link tbb.lib $(LIBS) $(MYLDFLAGS) /OUT:$(PROG).exe
|
||||
debug:
|
||||
$(CXX) *.cpp /MDd /Od /Zi /D TBB_USE_DEBUG /D _DEBUG $(MYCXXFLAGS) /link tbb_debug.lib $(LIBS) $(MYLDFLAGS) /OUT:$(PROG).exe
|
||||
clean:
|
||||
@cmd.exe /C del $(PROG).exe *.obj *.?db *.manifest
|
||||
test:
|
||||
$(PROG) $(ARGS)
|
||||
compiler_check:
|
||||
@$(CXX) >nul 2>&1 || echo "$(CXX) command not found. Check if CXX=$(CXX) is set properly"
|
||||
|
||||
perf_build: release
|
||||
|
||||
perf_run:
|
||||
$(PROG) $(PERF_RUN_ARGS)
|
||||
@@ -0,0 +1,427 @@
|
||||
<!DOCTYPE html>
|
||||
<html xmlns:mso="urn:schemas-microsoft-com:office:office" xmlns:msdt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882">
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||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<style>
|
||||
::selection {
|
||||
background: #b7ffb7;
|
||||
}
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||||
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|
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|
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|
||||
</style>
|
||||
<title>Intel® Threading Building Blocks. Shortpath sample</title>
|
||||
</head>
|
||||
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|
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|
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9Or1LzUmVVz+HJXDAAAAAElFTkSuQmCC">
|
||||
<h1 class="title">Intel® Threading Building Blocks.<br>Shortpath sample</h1>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
This directory contains a simple example that solves the single source
|
||||
shortest path problem.
|
||||
<br><br>
|
||||
It is parameterized by N, a number of nodes, and a start and end node in [0..N).
|
||||
A graph is generated with N nodes and some random number of connections between those nodes.
|
||||
A parallel algorithm based on A* is used to find the shortest path.
|
||||
<br><br>
|
||||
This algorithm varies from serial A* in that it needs to add nodes back to
|
||||
the open set when the g estimate (shortest path from start to the node) is improved,
|
||||
even if the node has already been "visited". This is because nodes are added and removed
|
||||
from the open-set in parallel, resulting in some less optimal paths being explored.
|
||||
The open-set is implemented with the concurrent_priority_queue.
|
||||
<br><br>
|
||||
Note that since we re-visit nodes, the <i>f</i> estimate (on which the priority queue is sorted)
|
||||
is not technically needed, so we could use this same parallel algorithm with just a concurrent_queue.
|
||||
However, keeping the <i>f</i> estimate and using <code>concurrent_priority_queue</code>
|
||||
results in much better performance.
|
||||
<br><br>
|
||||
Silent mode prints run time only,
|
||||
regular mode prints the shortest path length,
|
||||
and verbose mode prints out the shortest path.
|
||||
<br><br>
|
||||
The generated graph follows a pattern in which the closer two pairs of
|
||||
node ids are together, the fewer hops there are in a typical path
|
||||
between those nodes. So, for example, the path between 5 and 7 likely
|
||||
has few hops whereas 14 to 78 has more and 0 to 9999 has even more,
|
||||
etc.
|
||||
</p>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">System Requirements</div>
|
||||
<input type="checkbox">
|
||||
<div class="show-hide">
|
||||
<p>
|
||||
For the most up to date system requirements, see the <a href="http://software.intel.com/en-us/articles/intel-threading-building-blocks-release-notes">release notes.</a>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Files</div>
|
||||
<input type="checkbox" checked="checked">
|
||||
<div class="show-hide">
|
||||
<dl>
|
||||
<dt><a href="shortpath.cpp">shortpath.cpp</a>
|
||||
<dd>Driver.
|
||||
<dt><a href="Makefile">Makefile</a>
|
||||
<dd>Makefile for building the example.
|
||||
</dl>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Directories</div>
|
||||
<input type="checkbox" checked="checked">
|
||||
<div class="show-hide">
|
||||
<dl>
|
||||
<dt><a href="msvs/">msvs</a>
|
||||
<dd>Contains Microsoft* Visual Studio* workspace for building and running the example with the Intel® C++ Compiler (Windows* systems only).
|
||||
<dt><a href="xcode/">xcode</a>
|
||||
<dd>Contains macOS* Xcode* workspace for building and running the example (macOS* systems only).
|
||||
</dl>
|
||||
<p>For information about the minimum supported version of IDE, see <a href="http://software.intel.com/en-us/articles/intel-threading-building-blocks-release-notes">release notes.</a></p>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Build instructions</div>
|
||||
<input type="checkbox" checked="checked">
|
||||
<div class="show-hide">
|
||||
<p>General build directions can be found <a href="../../index.html">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Usage</div>
|
||||
<input type="checkbox" checked="checked">
|
||||
<div class="show-hide">
|
||||
<dl>
|
||||
<dt><tt>shortpath <i>-h</i></tt>
|
||||
<dd>Prints the help for command line options
|
||||
<dt><tt>shortpath [<i>#threads</i>=value] [<i>verbose</i>] [<i>silent</i>] [<i>N</i>=value] [<i>start</i>=value] [<i>end</i>=value] [<i>#threads</i>]</tt>
|
||||
<dd><tt><i>#threads</i></tt> is the number of threads to use; a range of the form <tt><i>low[:high]</i></tt> where <tt><i>low</i></tt> and optional <tt><i>high</i></tt> are non-negative integers, or <tt><i>'auto'</i></tt> for a platform-specific default number.<br>
|
||||
<tt><i>verbose</i></tt> print full path to screen<br>
|
||||
<tt><i>silent</i></tt> limits output to timing info; overrides verbose<br>
|
||||
<tt><i>N</i></tt> number of nodes in graph<br>
|
||||
<tt><i>start</i></tt> node to start path at<br>
|
||||
<tt><i>end</i></tt> node to end path at<br>
|
||||
<dt>To run a short version of this example, e.g., for use with Intel® Parallel Inspector:
|
||||
<dd>Build a <i>debug</i> version of the example
|
||||
(see the <a href="../../index.html">build instructions</a>).
|
||||
<br>Run it with a small problem size and the desired number of threads, e.g., <tt>shortpath 4 N=20 start=0 end=19</tt>.
|
||||
</dl>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<br>
|
||||
<a href="../index.html">Up to parent directory</a>
|
||||
<hr>
|
||||
<div class="changes">
|
||||
<div class="h3-alike">Legal Information</div>
|
||||
<input type="checkbox">
|
||||
<div class="show-hide">
|
||||
<p>
|
||||
Intel and the Intel logo are trademarks of Intel Corporation in the U.S. and/or other countries.
|
||||
<br>* Other names and brands may be claimed as the property of others.
|
||||
<br>© 2020, Intel Corporation
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
@@ -0,0 +1,359 @@
|
||||
/*
|
||||
Copyright (c) 2005-2020 Intel Corporation
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
|
||||
#include <cstdio>
|
||||
#include <vector>
|
||||
#include <atomic>
|
||||
#include <math.h>
|
||||
|
||||
#include "tbb/tick_count.h"
|
||||
#include "tbb/task_group.h"
|
||||
#include "tbb/concurrent_priority_queue.h"
|
||||
#include "tbb/spin_mutex.h"
|
||||
#include "tbb/parallel_for.h"
|
||||
#include "tbb/blocked_range.h"
|
||||
#include "tbb/global_control.h"
|
||||
#include "../../common/utility/utility.h"
|
||||
#include "../../common/utility/fast_random.h"
|
||||
#include "../../common/utility/get_default_num_threads.h"
|
||||
|
||||
#if defined(_MSC_VER) && defined(_Wp64)
|
||||
// Workaround for overzealous compiler warnings in /Wp64 mode
|
||||
#pragma warning (disable: 4267)
|
||||
#endif /* _MSC_VER && _Wp64 */
|
||||
|
||||
using namespace std;
|
||||
using namespace tbb;
|
||||
|
||||
struct point {
|
||||
double x, y;
|
||||
point() {}
|
||||
point(double _x, double _y) : x(_x), y(_y) {}
|
||||
point(const point& p) : x(p.x), y(p.y) {}
|
||||
};
|
||||
|
||||
double get_distance(const point& p1, const point& p2) {
|
||||
double xdiff=p1.x-p2.x, ydiff=p1.y-p2.y;
|
||||
return sqrt(xdiff*xdiff + ydiff*ydiff);
|
||||
}
|
||||
|
||||
// generates random points on 2D plane within a box of maxsize width & height
|
||||
point generate_random_point(utility::FastRandom& mr) {
|
||||
const size_t maxsize=500;
|
||||
double x = (double)(mr.get() % maxsize);
|
||||
double y = (double)(mr.get() % maxsize);
|
||||
return point(x,y);
|
||||
}
|
||||
|
||||
// weighted toss makes closer nodes (in the point vector) heavily connected
|
||||
bool die_toss(size_t a, size_t b, utility::FastRandom& mr) {
|
||||
int node_diff = std::abs((int)(a-b));
|
||||
// near nodes
|
||||
if (node_diff < 16) return true;
|
||||
// mid nodes
|
||||
if (node_diff < 64) return ((int)mr.get() % 8 == 0);
|
||||
// far nodes
|
||||
if (node_diff < 512) return ((int)mr.get() % 16 == 0);
|
||||
return false;
|
||||
}
|
||||
|
||||
typedef vector<point> point_set;
|
||||
typedef size_t vertex_id;
|
||||
typedef std::pair<vertex_id,double> vertex_rec;
|
||||
typedef vector<vector<vertex_id> > edge_set;
|
||||
|
||||
bool verbose = false; // prints bin details and other diagnostics to screen
|
||||
bool silent = false; // suppress all output except for time
|
||||
size_t N = 1000; // number of vertices
|
||||
size_t src = 0; // start of path
|
||||
size_t dst = N-1; // end of path
|
||||
double INF=100000.0; // infinity
|
||||
size_t grainsize = 16; // number of vertices per task on average
|
||||
size_t max_spawn; // max tasks to spawn
|
||||
std::atomic<size_t> num_spawn; // number of active tasks
|
||||
|
||||
point_set vertices; // vertices
|
||||
edge_set edges; // edges
|
||||
vector<vertex_id> predecessor; // for recreating path from src to dst
|
||||
|
||||
vector<double> f_distance; // estimated distances at particular vertex
|
||||
vector<double> g_distance; // current shortest distances from src vertex
|
||||
spin_mutex *locks; // a lock for each vertex
|
||||
task_group *sp_group; // task group for tasks executing sub-problems
|
||||
|
||||
class compare_f {
|
||||
public:
|
||||
bool operator()(const vertex_rec& u, const vertex_rec& v) const {
|
||||
return u.second>v.second;
|
||||
}
|
||||
};
|
||||
|
||||
concurrent_priority_queue<vertex_rec, compare_f> open_set; // tentative vertices
|
||||
|
||||
void shortpath_helper();
|
||||
|
||||
#if !__TBB_CPP11_LAMBDAS_PRESENT
|
||||
class shortpath_helper_functor {
|
||||
public:
|
||||
shortpath_helper_functor() {};
|
||||
void operator() () const { shortpath_helper(); }
|
||||
};
|
||||
#endif
|
||||
|
||||
void shortpath() {
|
||||
sp_group = new task_group;
|
||||
g_distance[src] = 0.0; // src's distance from src is zero
|
||||
f_distance[src] = get_distance(vertices[src], vertices[dst]); // estimate distance from src to dst
|
||||
open_set.push(make_pair(src,f_distance[src])); // push src into open_set
|
||||
#if __TBB_CPP11_LAMBDAS_PRESENT
|
||||
sp_group->run([](){ shortpath_helper(); });
|
||||
#else
|
||||
sp_group->run( shortpath_helper_functor() );
|
||||
#endif
|
||||
sp_group->wait();
|
||||
delete sp_group;
|
||||
}
|
||||
|
||||
void shortpath_helper() {
|
||||
vertex_rec u_rec;
|
||||
while (open_set.try_pop(u_rec)) {
|
||||
vertex_id u = u_rec.first;
|
||||
if (u==dst) continue;
|
||||
double f = u_rec.second;
|
||||
double old_g_u = 0.0;
|
||||
{
|
||||
spin_mutex::scoped_lock l(locks[u]);
|
||||
if (f > f_distance[u]) continue; // prune search space
|
||||
old_g_u = g_distance[u];
|
||||
}
|
||||
for (size_t i=0; i<edges[u].size(); ++i) {
|
||||
vertex_id v = edges[u][i];
|
||||
double new_g_v = old_g_u + get_distance(vertices[u], vertices[v]);
|
||||
double new_f_v = 0.0;
|
||||
// the push flag lets us move some work out of the critical section below
|
||||
bool push = false;
|
||||
{
|
||||
spin_mutex::scoped_lock l(locks[v]);
|
||||
if (new_g_v < g_distance[v]) {
|
||||
predecessor[v] = u;
|
||||
g_distance[v] = new_g_v;
|
||||
new_f_v = f_distance[v] = g_distance[v] + get_distance(vertices[v], vertices[dst]);
|
||||
push = true;
|
||||
}
|
||||
}
|
||||
if (push) {
|
||||
open_set.push(make_pair(v,new_f_v));
|
||||
size_t n_spawn = ++num_spawn;
|
||||
if (n_spawn < max_spawn) {
|
||||
#if __TBB_CPP11_LAMBDAS_PRESENT
|
||||
sp_group->run([]{ shortpath_helper(); });
|
||||
#else
|
||||
sp_group->run( shortpath_helper_functor() );
|
||||
#endif
|
||||
}
|
||||
else --num_spawn;
|
||||
}
|
||||
}
|
||||
}
|
||||
--num_spawn;
|
||||
}
|
||||
|
||||
void make_path(vertex_id src, vertex_id dst, vector<vertex_id>& path) {
|
||||
vertex_id at = predecessor[dst];
|
||||
if (at == N) path.push_back(src);
|
||||
else if (at == src) { path.push_back(src); path.push_back(dst); }
|
||||
else { make_path(src, at, path); path.push_back(dst); }
|
||||
}
|
||||
|
||||
void print_path() {
|
||||
vector<vertex_id> path;
|
||||
double path_length=0.0;
|
||||
make_path(src, dst, path);
|
||||
if (verbose) printf("\n ");
|
||||
for (size_t i=0; i<path.size(); ++i) {
|
||||
if (path[i] != dst) {
|
||||
double seg_length = get_distance(vertices[path[i]], vertices[path[i+1]]);
|
||||
if (verbose) printf("%6.1f ", seg_length);
|
||||
path_length += seg_length;
|
||||
}
|
||||
else if (verbose) printf("\n");
|
||||
}
|
||||
if (verbose) {
|
||||
for (size_t i=0; i<path.size(); ++i) {
|
||||
if (path[i] != dst) printf("(%4d)------>", (int)path[i]);
|
||||
else printf("(%4d)\n", (int)path[i]);
|
||||
}
|
||||
}
|
||||
if (verbose) printf("Total distance = %5.1f\n", path_length);
|
||||
else if (!silent) printf(" %5.1f\n", path_length);
|
||||
}
|
||||
|
||||
#if !__TBB_CPP11_LAMBDAS_PRESENT
|
||||
class gen_vertices {
|
||||
public:
|
||||
gen_vertices() {}
|
||||
void operator() (blocked_range<size_t>& r) const {
|
||||
utility::FastRandom my_random((unsigned int)r.begin());
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
vertices[i] = generate_random_point(my_random);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
class gen_edges {
|
||||
public:
|
||||
gen_edges() {}
|
||||
void operator() (blocked_range<size_t>& r) const {
|
||||
utility::FastRandom my_random((unsigned int)r.begin());
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
for (size_t j=0; j<i; ++j) {
|
||||
if (die_toss(i, j, my_random))
|
||||
edges[i].push_back(j);
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
class reset_vertices {
|
||||
public:
|
||||
reset_vertices() {}
|
||||
void operator() (blocked_range<size_t>& r) const {
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
f_distance[i] = g_distance[i] = INF;
|
||||
predecessor[i] = N;
|
||||
}
|
||||
}
|
||||
};
|
||||
#endif
|
||||
|
||||
void InitializeGraph() {
|
||||
global_control c(tbb::global_control::max_allowed_parallelism, utility::get_default_num_threads());
|
||||
vertices.resize(N);
|
||||
edges.resize(N);
|
||||
predecessor.resize(N);
|
||||
g_distance.resize(N);
|
||||
f_distance.resize(N);
|
||||
locks = new spin_mutex[N];
|
||||
if (verbose) printf("Generating vertices...\n");
|
||||
#if __TBB_CPP11_LAMBDAS_PRESENT
|
||||
parallel_for(blocked_range<size_t>(0,N,64),
|
||||
[&](blocked_range<size_t>& r) {
|
||||
utility::FastRandom my_random(r.begin());
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
vertices[i] = generate_random_point(my_random);
|
||||
}
|
||||
}, simple_partitioner());
|
||||
#else
|
||||
parallel_for(blocked_range<size_t>(0,N,64), gen_vertices(), simple_partitioner());
|
||||
#endif
|
||||
if (verbose) printf("Generating edges...\n");
|
||||
#if __TBB_CPP11_LAMBDAS_PRESENT
|
||||
parallel_for(blocked_range<size_t>(0,N,64),
|
||||
[&](blocked_range<size_t>& r) {
|
||||
utility::FastRandom my_random(r.begin());
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
for (size_t j=0; j<i; ++j) {
|
||||
if (die_toss(i, j, my_random))
|
||||
edges[i].push_back(j);
|
||||
}
|
||||
}
|
||||
}, simple_partitioner());
|
||||
#else
|
||||
parallel_for(blocked_range<size_t>(0,N,64), gen_edges(), simple_partitioner());
|
||||
#endif
|
||||
for (size_t i=0; i<N; ++i) {
|
||||
for (size_t j=0; j<edges[i].size(); ++j) {
|
||||
vertex_id k = edges[i][j];
|
||||
edges[k].push_back(i);
|
||||
}
|
||||
}
|
||||
if (verbose) printf("Done.\n");
|
||||
}
|
||||
|
||||
void ReleaseGraph() {
|
||||
delete []locks;
|
||||
}
|
||||
|
||||
void ResetGraph() {
|
||||
global_control c(tbb::global_control::max_allowed_parallelism, utility::get_default_num_threads());
|
||||
#if __TBB_CPP11_LAMBDAS_PRESENT
|
||||
parallel_for(blocked_range<size_t>(0,N),
|
||||
[&](blocked_range<size_t>& r) {
|
||||
for (size_t i=r.begin(); i!=r.end(); ++i) {
|
||||
f_distance[i] = g_distance[i] = INF;
|
||||
predecessor[i] = N;
|
||||
}
|
||||
});
|
||||
#else
|
||||
parallel_for(blocked_range<size_t>(0,N), reset_vertices());
|
||||
#endif
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
try {
|
||||
utility::thread_number_range threads(utility::get_default_num_threads);
|
||||
utility::parse_cli_arguments(argc, argv,
|
||||
utility::cli_argument_pack()
|
||||
//"-h" option for displaying help is present implicitly
|
||||
.positional_arg(threads,"#threads",utility::thread_number_range_desc)
|
||||
.arg(verbose,"verbose"," print diagnostic output to screen")
|
||||
.arg(silent,"silent"," limits output to timing info; overrides verbose")
|
||||
.arg(N,"N"," number of vertices")
|
||||
.arg(src,"start"," start of path")
|
||||
.arg(dst,"end"," end of path")
|
||||
);
|
||||
if (silent) verbose = false; // make silent override verbose
|
||||
else
|
||||
printf("shortpath will run with %d vertices to find shortest path between vertices"
|
||||
" %d and %d using %d:%d threads.\n",
|
||||
(int)N, (int)src, (int)dst, (int)threads.first, (int)threads.last);
|
||||
|
||||
if (dst >= N) {
|
||||
if (verbose)
|
||||
printf("end value %d is invalid for %d vertices; correcting to %d\n", (int)dst, (int)N, (int)N-1);
|
||||
dst = N-1;
|
||||
}
|
||||
|
||||
num_spawn = 0;
|
||||
max_spawn = N/grainsize;
|
||||
tick_count t0, t1;
|
||||
InitializeGraph();
|
||||
for (int n_thr=threads.first; n_thr<=threads.last; n_thr=threads.step(n_thr)) {
|
||||
ResetGraph();
|
||||
global_control c(tbb::global_control::max_allowed_parallelism, n_thr);
|
||||
t0 = tick_count::now();
|
||||
shortpath();
|
||||
t1 = tick_count::now();
|
||||
if (!silent) {
|
||||
if (predecessor[dst] != N) {
|
||||
printf("%d threads: [%6.6f] The shortest path from vertex %d to vertex %d is:",
|
||||
(int)n_thr, (t1-t0).seconds(), (int)src, (int)dst);
|
||||
print_path();
|
||||
}
|
||||
else {
|
||||
printf("%d threads: [%6.6f] There is no path from vertex %d to vertex %d\n",
|
||||
(int)n_thr, (t1-t0).seconds(), (int)src, (int)dst);
|
||||
}
|
||||
} else
|
||||
utility::report_elapsed_time((t1-t0).seconds());
|
||||
}
|
||||
ReleaseGraph();
|
||||
return 0;
|
||||
} catch(std::exception& e) {
|
||||
cerr<<"error occurred. error text is :\"" <<e.what()<<"\"\n";
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,310 @@
|
||||
// !$*UTF8*$!
|
||||
{
|
||||
archiveVersion = 1;
|
||||
classes = {
|
||||
};
|
||||
objectVersion = 46;
|
||||
objects = {
|
||||
|
||||
/* Begin PBXBuildFile section */
|
||||
61C4771B13CE199D0022F8F6 /* shortpath.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 61C4771A13CE199D0022F8F6 /* shortpath.cpp */; };
|
||||
/* End PBXBuildFile section */
|
||||
|
||||
/* Begin PBXBuildRule section */
|
||||
C3C5894C218B560C00DAC94C /* PBXBuildRule */ = {
|
||||
isa = PBXBuildRule;
|
||||
compilerSpec = com.intel.compilers.icc.latest;
|
||||
fileType = sourcecode.cpp;
|
||||
isEditable = 1;
|
||||
outputFiles = (
|
||||
);
|
||||
script = "# Type a script or drag a script file from your workspace to insert its path.\n";
|
||||
};
|
||||
/* End PBXBuildRule section */
|
||||
|
||||
/* Begin PBXCopyFilesBuildPhase section */
|
||||
8DD76F690486A84900D96B5E /* CopyFiles */ = {
|
||||
isa = PBXCopyFilesBuildPhase;
|
||||
buildActionMask = 12;
|
||||
dstPath = "";
|
||||
dstSubfolderSpec = 16;
|
||||
files = (
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
/* End PBXCopyFilesBuildPhase section */
|
||||
|
||||
/* Begin PBXFileReference section */
|
||||
61C4771A13CE199D0022F8F6 /* shortpath.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = shortpath.cpp; path = ../shortpath.cpp; sourceTree = "<group>"; };
|
||||
8DD76F6C0486A84900D96B5E /* Shortpath */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Shortpath; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
/* End PBXFileReference section */
|
||||
|
||||
/* Begin PBXFrameworksBuildPhase section */
|
||||
8DD76F660486A84900D96B5E /* Frameworks */ = {
|
||||
isa = PBXFrameworksBuildPhase;
|
||||
buildActionMask = 2147483647;
|
||||
files = (
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
/* End PBXFrameworksBuildPhase section */
|
||||
|
||||
/* Begin PBXGroup section */
|
||||
08FB7794FE84155DC02AAC07 /* Shortpath */ = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
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Reference in New Issue
Block a user