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Copy pathstreaming_pagerank.cpp
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367 lines (297 loc) · 11.8 KB
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/**
* @file
* @author Aapo Kyrola <akyrola@cs.cmu.edu>
* @version 1.0
*
* @section LICENSE
*
* Copyright [2012] [Aapo Kyrola, Guy Blelloch, Carlos Guestrin / Carnegie Mellon University]
*
* 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.
*
* @section DESCRIPTION
*
* Demonstration for streaming graph updates. This application reads from a file
* list of edges and adds them into the graph continuously. Simultaneously, pagerank
* is computed for the evolving graph.
*
* This code includes a fair amount of code for demo purposes. To be cleaned
* eventually.
*/
#include <string>
#include <fstream>
#include <cmath>
#define GRAPHCHI_DISABLE_COMPRESSION
#include "graphchi_basic_includes.hpp"
#include "engine/dynamic_graphs/graphchi_dynamicgraph_engine.hpp"
#include "util/toplist.hpp"
/* HTTP admin tool */
#include "httpadmin/chi_httpadmin.hpp"
#include "httpadmin/plotter.hpp"
using namespace graphchi;
#define THRESHOLD 1e-1f
#define RANDOMRESETPROB 0.15f
#define DEMO 1
typedef float VertexDataType;
typedef float EdgeDataType;
graphchi_dynamicgraph_engine<float, float> * dyngraph_engine;
std::string streaming_graph_file;
std::string getname(vid_t v);
std::string getname(vid_t userid) {
#ifdef DEMO
// Temporary code for demo purposes!
int f = open("/Users/akyrola/graphs/twitter_names.dat", O_RDONLY);
if (f < 0) return "n/a";
char s[16];
size_t idx = userid * 16;
preada(f, s, 16, idx);
close(f);
s[15] = '\0';
return std::string(s);
#else
return "":
#endif
}
struct PagerankProgram : public GraphChiProgram<VertexDataType, EdgeDataType> {
/**
* Called before an iteration starts.
*/
void before_iteration(int iteration, graphchi_context &gcontext) {
}
/**
* Called after an iteration has finished.
*/
void after_iteration(int iteration, graphchi_context &gcontext) {
#ifdef DEMO
std::vector< vertex_value<float> > top = get_top_vertices<float>(gcontext.filename, 20);
for(int i=0; i < (int) top.size(); i++) {
vertex_value<float> vv = top[i];
std::cout << (i+1) << ". " << vv.vertex << " " << getname(vv.vertex) << ": " << vv.value << std::endl;
}
/* Keep top 20 available for http admin */
for(int i=0; i < (int) top.size(); i++) {
vertex_value<float> vv = top[i];
std::stringstream ss;
ss << "rank" << i;
std::stringstream sv;
sv << vv.vertex << ":" << getname(vv.vertex) << ":" << vv.value<< "";
dyngraph_engine->set_json(ss.str(), sv.str());
}
#endif
}
/**
* Called before an execution interval is started.
*/
void before_exec_interval(vid_t window_st, vid_t window_en, graphchi_context &ginfo) {
#ifdef DEMO
update_plotdata(dyngraph_engine);
#endif
}
/**
* Pagerank update function.
*/
void update(graphchi_vertex<VertexDataType, EdgeDataType> &v, graphchi_context &ginfo) {
float sum=0;
if (ginfo.iteration == 0) {
/* On first iteration, initialize vertex */
for(int i=0; i < v.num_outedges(); i++) {
graphchi_edge<float> * edge = v.outedge(i);
edge->set_data(1.0f / v.num_outedges());
if (ginfo.scheduler != NULL)
ginfo.scheduler->add_task(edge->vertex_id());
}
v.set_data(RANDOMRESETPROB);
/* If using selective scheduling, schedule myself for next iteration */
if (ginfo.scheduler != NULL)
ginfo.scheduler->add_task(v.id());
} else {
/* Compute the sum of neighbors' weighted pageranks */
for(int i=0; i < v.num_inedges(); i++) {
float val = v.inedge(i)->get_data();
sum += val;
}
/* Compute my pagerank */
float pagerank = RANDOMRESETPROB + (1 - RANDOMRESETPROB) * sum;
float oldvalue = v.get_data();
float delta = (float) fabs(oldvalue - pagerank);
bool significant_change = (delta >= THRESHOLD);
if (v.num_outedges() > 0) {
float pagerankcont = pagerank/v.num_outedges();
for(int i=0; i < v.num_outedges(); i++) {
graphchi_edge<float> * edge = v.outedge(i);
/* If using selective scheduling, and the change was larger than
a threshold, add neighbor to schedule. */
if (ginfo.scheduler != NULL) {
if (significant_change) {
ginfo.scheduler->add_task(edge->vertex_id());
}
}
edge->set_data(pagerankcont);
}
}
v.set_data(pagerank);
/* Keep track of the progression of the computation */
ginfo.log_change(delta);
}
}
};
/* Demo stuff. */
class IntervalTopRequest : public custom_request_handler {
public:
virtual std::string handle(const char * req) {
const char * shardnum_str = &req[strlen("/ajax/shardpagerank")];
int shardnum = atoi(shardnum_str);
logstream(LOG_DEBUG) << "Requested shard pagerank: " << shardnum_str << std::endl;
if (shardnum >= 0 && shardnum < dyngraph_engine->get_nshards()) {
vid_t fromvid = dyngraph_engine->get_interval_start(shardnum);
vid_t tovid = dyngraph_engine->get_interval_end(shardnum);
std::vector< vertex_value<float> > top =
get_top_vertices<float>(dyngraph_engine->get_context().filename, 10,
fromvid, tovid + 1);
std::stringstream ss;
ss << "{";
for(int i=0; i < (int) top.size(); i++) {
vertex_value<float> vv = top[i];
if (i > 0) ss << ",";
ss << "\"rank" << i << "\": \"" << vv.vertex << ":" << getname(vv.vertex) << ":" << vv.value<< "\"";
}
ss << "}";
std::cout << ss.str();
return ss.str();
}
return "error";
}
virtual bool responds_to(const char * req) {
return (strncmp(req, "/ajax/shardpagerank", 19) == 0);
}
};
bool running = true;
void * plotter_thread(void * info);
void * plotter_thread(void * info) {
usleep(1000000 * 10);
init_plots(dyngraph_engine);
while(running) {
/* Update plots */
drawplots();
usleep(1000000 * 10);
}
return NULL;
}
/**
* Function executed by a separate thread that streams
* graph from a file.
*/
void * dynamic_graph_reader(void * info);
void * dynamic_graph_reader(void * info) {
std::cout << "Start sleeping..." << std::endl;
usleep(50000);
std::cout << "End sleeping..." << std::endl;
int edges_per_sec = get_option_int("edges_per_sec", 100000);
logstream(LOG_INFO) << "Going to stream from: " << streaming_graph_file << std::endl;
FILE * f = fopen(streaming_graph_file.c_str(), "r");
if (f == NULL) {
logstream(LOG_ERROR) << "Could not open file for streaming: " << streaming_graph_file <<
" error: " << strerror(errno) << std::endl;
}
assert(f != NULL);
logstream(LOG_INFO) << "Streaming speed capped at: " << edges_per_sec << " edges/sec." << std::endl;
size_t c = 0;
size_t ingested = 0;
// Used for flow control
timeval last, now;
gettimeofday(&last, NULL);
vid_t from;
vid_t to;
char s[1024];
while(fgets(s, 1024, f) != NULL) {
FIXLINE(s);
/* Read next line */
char delims[] = "\t ";
char * t;
t = strtok(s, delims);
from = atoi(t);
t = strtok(NULL, delims);
to = atoi(t);
if (from == to) {
// logstream(LOG_WARNING) << "Self-edge in stream: " << from << " <-> " << to << std::endl;
continue;
}
bool success=false;
while (!success) {
success = dyngraph_engine->add_edge(from, to, 0.0f);
}
dyngraph_engine->add_task(from);
ingested++;
if (++c % edges_per_sec == 0) {
std::cout << "Stream speed check...." << std::endl;
double sincelast;
double speed;
// Throttling - keeps average speed of edges/sec in control
do {
gettimeofday(&now, NULL);
sincelast = now.tv_sec-last.tv_sec+ ((double)(now.tv_usec-last.tv_usec))/1.0E6;
usleep(20000);
speed = (c / sincelast);
} while (speed > edges_per_sec);
dyngraph_engine->set_json("ingestspeed", speed);
logstream(LOG_INFO) << "Stream speed check ended.... Speed now:" << speed << " edges/sec" << std::endl;
dyngraph_engine->set_json("ingestedges", ingested);
}
if (c % 1000 == 0) {
set_ingested_edges(ingested);
}
}
fclose(f);
dyngraph_engine->finish_after_iters(10);
return NULL;
}
int main(int argc, const char ** argv) {
graphchi_init(argc, argv);
metrics m("streaming-pagerank");
/* Parameters */
std::string filename = get_option_string("file"); // Base filename
int niters = 100000; // End of computation to be determined programmatically
// Pagerank can be run with or without selective scheduling
bool scheduler = true;
int ntop = get_option_int("top", 20);
/* Process input file (the base graph) - if not already preprocessed */
int nshards = convert_if_notexists<EdgeDataType>(filename, get_option_string("nshards", "auto"));
/* Streaming input graph - must be in edge-list format */
streaming_graph_file = get_option_string_interactive("streaming_graph_file",
"Pathname to graph file to stream edges from");
/* Create the engine object */
dyngraph_engine = new graphchi_dynamicgraph_engine<float, float>(filename, nshards, scheduler, m);
dyngraph_engine->set_modifies_inedges(false); // Improves I/O performance.
/* Start streaming thread */
pthread_t strthread;
int ret = pthread_create(&strthread, NULL, dynamic_graph_reader, NULL);
assert(ret>=0);
/* Start HTTP admin */
start_httpadmin< graphchi_dynamicgraph_engine<float, float> >(dyngraph_engine);
register_http_request_handler(new IntervalTopRequest());
pthread_t plotterthr;
ret = pthread_create(&plotterthr, NULL, plotter_thread, NULL);
assert(ret>=0);
/* Run the engine */
PagerankProgram program;
dyngraph_engine->run(program, niters);
running = false;
/* Output top ranked vertices */
std::vector< vertex_value<float> > top = get_top_vertices<float>(filename, ntop);
std::cout << "Print top " << ntop << " vertices:" << std::endl;
for(int i=0; i < (int)top.size(); i++) {
std::cout << (i+1) << ". " << top[i].vertex << "\t" << top[i].value << std::endl;
}
metrics_report(m);
return 0;
}
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