Beispiel #1
0
void wait_for_all_tasks( struct work_queue *q )
{
	struct work_queue_task *t;
	while(!work_queue_empty(q)) {
		t = work_queue_wait(q,5);
		if(t) work_queue_task_delete(t);
	}
}
Beispiel #2
0
double wait_partition_tasks(struct work_queue *q, int timeout, char *task_times_file) {
	struct work_queue_task *t;
	FILE *task_times_fp = NULL;

	double task_execution_times = 0;
	int64_t total_transfered_bytes = 0;
	time_t total_transfer_time = 0;

	if(task_times_file) {
		task_times_fp = fopen("wq_sort.tasktimes", "w");
		if (!task_times_fp) {
        	fprintf(stderr, "Opening of wq_sort.tasktimes file failed!\n");
    	}
	}

	while(!work_queue_empty(q)) {
		t = work_queue_wait(q, timeout);
		if(t) {
			fprintf(stdout, "Task (taskid# %d) complete in %llu: %s (return code %d)\n", t->taskid, (long long unsigned) t->cmd_execution_time, t->command_line, t->return_status);

			total_transfered_bytes += t->total_bytes_transferred;
			total_transfer_time += t->total_transfer_time;
			fprintf(stderr, "Total bytes sent %" PRId64 " in %llu s\n", total_transfered_bytes, (long long unsigned) total_transfer_time);
			fprintf(stderr, "Default bandwidth (Bps): %f\n", bandwidth_bytes_per_sec);
			bandwidth_bytes_per_sec  = total_transfered_bytes / (total_transfer_time/1000000.0);
			fprintf(stderr, "Measured bandwidth (Bps): %f\n", bandwidth_bytes_per_sec);

			task_execution_times += t->cmd_execution_time/1000000.00;

			if(task_times_fp) {
				fprintf(task_times_fp, "%d: %llu\n", t->taskid, (long long unsigned) t->cmd_execution_time);
			}

			work_queue_task_delete(t);
		}
	}

	if(task_times_fp)
		fclose(task_times_fp);

	return task_execution_times;
}
Beispiel #3
0
void work_queue_wait(struct work_queue *q)
{
	while (!work_queue_empty(q))
		event_loop(-1);
}
int main(int argc, char *argv[])
{
	struct work_queue *q;
	struct work_queue_task *t;
	int port = WORK_QUEUE_DEFAULT_PORT;
	int taskid;
	int i;

	if(argc < 2) {
		printf("work_queue_example <executable> <file1> [file2] [file3] ...\n");
		printf("Each file given on the command line will be compressed using a remote worker.\n");
		return 0;
	}

	debug_flags_set("all");

	q = work_queue_create(port);
	if(!q) {
		printf("couldn't listen on port %d: %s\n", port, strerror(errno));
		return 1;
	}

	printf("listening on port %d...\n", work_queue_port(q));

	for(i = 1; i < argc; i++) {

		char infile[256], outfile[256], command[256];

		sprintf(infile, "%s", argv[i]);
		sprintf(outfile, "%s.gz", argv[i]);
		sprintf(command, "./gzip < %s > %s", infile, outfile);

		t = work_queue_task_create(command);
		if (!work_queue_task_specify_file(t, "/usr/bin/gzip", "gzip", WORK_QUEUE_INPUT, WORK_QUEUE_CACHE)) {
			printf("task_specify_file() failed for /usr/bin/gzip: check if arguments are null or remote name is an absolute path.\n");
			return 1; 	
		}
		if (!work_queue_task_specify_file(t, infile, infile, WORK_QUEUE_INPUT, WORK_QUEUE_NOCACHE)) {
			printf("task_specify_file() failed for %s: check if arguments are null or remote name is an absolute path.\n", infile);
			return 1; 	
		}
		if (!work_queue_task_specify_file(t, outfile, outfile, WORK_QUEUE_OUTPUT, WORK_QUEUE_NOCACHE)) {
			printf("task_specify_file() failed for %s: check if arguments are null or remote name is an absolute path.\n", outfile);
			return 1; 	
		}	
		taskid = work_queue_submit(q, t);

		printf("submitted task (id# %d): %s\n", taskid, t->command_line);
	}

	printf("waiting for tasks to complete...\n");

	while(!work_queue_empty(q)) {

		t = work_queue_wait(q, 5);
		if(t) {
			printf("task (id# %d) complete: %s (return code %d)\n", t->taskid, t->command_line, t->return_status);
			work_queue_task_delete(t);
		}
	}

	printf("all tasks complete!\n");

	work_queue_delete(q);

	return 0;
}
Beispiel #5
0
int main( int argc, char *argv[] )
{
	signed char c;
	int work_queue_master_mode = WORK_QUEUE_MASTER_MODE_STANDALONE;
	char *project = NULL;
	int priority = 0;

	const char *progname = "wavefront";

	debug_config(progname);

	struct option long_options[] = {
		{"help",  no_argument, 0, 'h'},
		{"version", no_argument, 0, 'v'},
		{"debug", required_argument, 0, 'd'},
		{"advertise", no_argument, 0, 'a'},
		{"project-name", required_argument, 0, 'N'},
		{"debug-file", required_argument, 0, 'o'},
		{"port", required_argument, 0, 'p'},
		{"priority", required_argument, 0, 'P'},
		{"estimated-time", required_argument, 0, 't'},
		{"random-port", required_argument, 0, 'Z'},
		{"bitmap", required_argument, 0, 'B'},
		{0,0,0,0}
	};

	while((c=getopt_long(argc,argv,"aB:d:hN:p:P:o:v:Z:", long_options, NULL)) >= 0) {
		switch(c) {
	    	case 'a':
			break;
		case 'd':
			debug_flags_set(optarg);
			break;
		case 'h':
			show_help(progname);
			exit(0);
			break;
		case 'N':
			work_queue_master_mode = WORK_QUEUE_MASTER_MODE_CATALOG;
			free(project);
			project = xxstrdup(optarg);
			break;
		case 'p':
			port = atoi(optarg);
			break;
		case 'P':
			priority = atoi(optarg);
			break;
		case 'o':
			debug_config_file(optarg);
			break;
		case 'v':
			cctools_version_print(stdout, progname);
			exit(0);
			break;
		case 'Z':
			port_file = optarg;
			port = 0;
			break;
		case 'B':
			progress_bitmap_file = optarg;
			break;
		default:
			show_help(progname);
			return 1;
		}
	}

	cctools_version_debug(D_DEBUG, argv[0]);

	if( (argc-optind)!=5 ) {
		show_help(progname);
		exit(1);
	}

	function = argv[optind];
	xsize=atoi(argv[optind+1]);
	ysize=atoi(argv[optind+2]);
	infile=argv[optind+3];
	outfile=argv[optind+4];

	start_time = time(0);
	last_display_time = 0;

	cells_total = xsize*ysize;
	
	xsize++;
	ysize++;

	array = text_array_create(xsize,ysize);
	if(!text_array_load(array,infile)) {
		fprintf(stderr,"couldn't load %s: %s",infile,strerror(errno));
		return 1;
	}

	int count = text_array_load(array,outfile);
	if(count>0) printf("recovered %d results from %s\n",count,outfile);
	
	logfile = fopen(outfile,"a");
	if(!logfile) {
		fprintf(stderr,"couldn't open %s for append: %s\n",outfile,strerror(errno));
		return 1;
	}

	if(work_queue_master_mode == WORK_QUEUE_MASTER_MODE_CATALOG && !project) {
		fprintf(stderr, "wavefront: wavefront master running in catalog mode. Please use '-N' option to specify the name of this project.\n");
		fprintf(stderr, "wavefront: Run \"%s -h\" for help with options.\n", argv[0]);
		return 1;
	}

	queue = work_queue_create(port);

	//Read the port the queue is actually running, in case we just called
	//work_queue_create(LINK_PORT_ANY)
	port  = work_queue_port(queue); 

	if(!queue) {
		fprintf(stderr,"%s: could not create work queue on port %d: %s\n",progname,port,strerror(errno));
		return 1;
	}

	if(port_file)
		opts_write_port_file(port_file, port);

	// advanced work queue options
	work_queue_specify_master_mode(queue, work_queue_master_mode);
	work_queue_specify_name(queue, project);
	work_queue_specify_priority(queue, priority);

	fprintf(stdout, "%s: listening for workers on port %d...\n",progname,work_queue_port(queue));

	if(progress_bitmap_file)
	{
		bmap = bitmap_create(xsize,ysize);
		wavefront_bitmap_initialize(bmap);
	}
		

	task_prime();

	struct work_queue_task *t;

	while(1) {
		if(time(0)!=last_display_time) display_progress(queue);

		t = work_queue_wait(queue,WORK_QUEUE_WAITFORTASK);
		if(!t) break;
		
		if(t->return_status==0) {
			int x,y;
			if(sscanf(t->tag,"%d %d",&x,&y)==2) {
				text_array_set(array,x,y,t->output);
				task_complete(x,y);
				fprintf(logfile,"%d %d %s\n",x,y,t->output);
				fflush(logfile);
				tasks_done++;
			} else {
				fprintf(stderr,"unexpected output: %s\nfrom command: %s\non host: %s",t->output,t->command_line,t->host);
			}
		} else {
		    fprintf(stderr,"function failed return value (%i) result (%i) on host %s. output:\n%s\n",t->return_status,t->result,t->host,t->output);
		}
		work_queue_task_delete(t);
		if(work_queue_empty(queue))
		    break;
	}

	display_progress(queue);
	return 0;
}
Beispiel #6
0
static batch_job_id_t batch_job_wq_wait (struct batch_queue * q, struct batch_job_info * info, time_t stoptime)
{
	static int try_open_log = 0;
	int timeout, taskid = -1;

	if(!try_open_log)
	{
		try_open_log = 1;
		if(!work_queue_specify_log(q->data, q->logfile))
		{
			return -1;
		}

		const char *transactions = batch_queue_get_option(q, "batch_log_transactions_name");
		if(transactions) {
			work_queue_specify_transactions_log(q->data, transactions);
		}
	}

	if(stoptime == 0) {
		timeout = WORK_QUEUE_WAITFORTASK;
	} else {
		timeout = MAX(0, stoptime - time(0));
	}

	struct work_queue_task *t = work_queue_wait(q->data, timeout);
	if(t) {
		info->submitted = t->time_when_submitted / 1000000;
		info->started   = t->time_when_commit_end / 1000000;
		info->finished  = t->time_when_done / 1000000;
		info->exited_normally = 1;
		info->exit_code = t->return_status;
		info->exit_signal = 0;
		info->disk_allocation_exhausted = t->disk_allocation_exhausted;

		/*
		   If the standard ouput of the job is not empty,
		   then print it, because this is analogous to a Unix
		   job, and would otherwise be lost.  Important for
		   capturing errors from the program.
		 */

		if(t->output && t->output[0]) {
			if(t->output[1] || t->output[0] != '\n') {
				string_chomp(t->output);
				printf("%s\n", t->output);
			}
		}

		char *outfile = itable_remove(q->output_table, t->taskid);
		if(outfile) {
			FILE *file = fopen(outfile, "w");
			if(file) {
				fwrite(t->output, strlen(t->output), 1, file);
				fclose(file);
			}
			free(outfile);
		}

		taskid = t->taskid;
		work_queue_task_delete(t);
	}

	if(taskid >= 0) {
		return taskid;
	}

	if(work_queue_empty(q->data)) {
		return 0;
	} else {
		return -1;
	}
}
Beispiel #7
0
int main(int argc, char **argv)
{
    debug_config(progname);

    // By default, turn on fast abort option since we know each job is of very similar size (in terms of runtime).
    // One can also set the fast_abort_multiplier by the '-f' option.
    wq_option_fast_abort_multiplier = 10;

    get_options(argc, argv, progname);

    outfile = fopen(outfilename, "a+");
    if(!outfile) {
        fprintf(stderr, "%s: couldn't open %s: %s\n", progname, outfilename, strerror(errno));
        exit(1);
    }

    if(!find_executable(filter_program_name, "PATH", filter_program_path, sizeof(filter_program_path))) {
        fprintf(stderr, "%s: couldn't find %s in your PATH.\n", progname, filter_program_path);
        exit(1);
    }

    if(work_queue_master_mode == WORK_QUEUE_MASTER_MODE_CATALOG && !project) {
        fprintf(stderr, "sand_filter: sand filter master running in catalog mode. Please use '-N' option to specify the name of this project.\n");
        fprintf(stderr, "sand_filter: Run \"%s -h\" for help with options.\n", argv[0]);
        return 1;
    }

    q = work_queue_create(port);
    if(!q) {
        fprintf(stderr, "%s: couldn't listen on port %d: %s\n", progname, port, strerror(errno));
        exit(1);
    }

    port = work_queue_port(q);

    if(port_file) {
        opts_write_port_file(port_file,port);
    }

    // advanced work queue options
    work_queue_specify_master_mode(q, work_queue_master_mode);
    work_queue_specify_name(q, project);
    work_queue_specify_priority(q, priority);

    load_sequences(sequence_filename);
    debug(D_DEBUG, "Sequence loaded.\n", curr_rect_y, curr_rect_x);

    init_checkpoint();

    start_time = time(0);

    int curr_start_x = 0, curr_start_y = 0, curr_rect_x = 0, curr_rect_y = 0;

    while(1) {
        while(work_queue_hungry(q)) {
            if(curr_start_y >= num_seqs)
                break;

            display_progress();

            if(checkpoint[curr_rect_y][curr_rect_x] != CHECKPOINT_STATUS_SUCCESS)
                task_submit(q, curr_rect_x, curr_rect_y);

            // Increment the x rectangle
            curr_rect_x++;
            curr_start_x += rectangle_size;

            // If we've reached the end of a row, move to the
            // next row by incrementing the y rectangle.
            if(curr_start_x >= num_seqs) {
                curr_rect_y++;
                curr_start_y += rectangle_size;
                curr_rect_x = curr_rect_y;
                curr_start_x = curr_rect_x * rectangle_size;
            }
        }

        if(work_queue_empty(q) && curr_start_y >= num_seqs)
            break;

        struct work_queue_task *t = work_queue_wait(q, 5);
        if(t)
            task_complete(t);

        display_progress();
    }

    printf("%s: candidates generated: %lu\n", progname, cand_count);

    if(checkpoint_file) {
        fclose(checkpoint_file);
    }

    fprintf(outfile, "EOF\n");
    fclose(outfile);

    work_queue_delete(q);

    if(!do_not_unlink)
        delete_dir(outdirname);

    return 0;
}
int main( int argc, char *argv[] )
{
	char c;

	const char *progname = "wavefront";

	debug_config(progname);

	while((c=getopt(argc,argv,"p:Pd:o:vh"))!=(char)-1) {
		switch(c) {
			case 'p':
				port = atoi(optarg);
				break;
			case 'd':
				debug_flags_set(optarg);
				break;
			case 'o':
				debug_config_file(optarg);
				break;
			case 'v':
				show_version(progname);
				exit(0);
				break;
			case 'h':
				show_help(progname);
				exit(0);
				break;
		}
	}

	if( (argc-optind)!=5 ) {
		show_help(progname);
		exit(1);
	}

	function = argv[optind];
	xsize=atoi(argv[optind+1]);
	ysize=atoi(argv[optind+2]);
	infile=argv[optind+3];
	outfile=argv[optind+4];

	start_time = time(0);
	last_display_time = 0;

	cells_total = xsize*ysize;
	
	xsize++;
	ysize++;

	array = text_array_create(xsize,ysize);
	if(!text_array_load(array,infile)) {
		fprintf(stderr,"couldn't load %s: %s",infile,strerror(errno));
		return 1;
	}

	int count = text_array_load(array,outfile);
	if(count>0) printf("recovered %d results from %s\n",count,outfile);
	
	logfile = fopen(outfile,"a");
	if(!logfile) {
		fprintf(stderr,"couldn't open %s for append: %s\n",outfile,strerror(errno));
		return 1;
	}

	queue = work_queue_create(port);

	task_prime();

	struct work_queue_task *t;

	while(1) {
		if(time(0)!=last_display_time) display_progress(queue);

		t = work_queue_wait(queue,WORK_QUEUE_WAITFORTASK);
		if(!t) break;
		
		if(t->return_status==0) {
			int x,y;
			if(sscanf(t->tag,"%d %d",&x,&y)==2) {
				text_array_set(array,x,y,t->output);
				task_complete(x,y);
				fprintf(logfile,"%d %d %s\n",x,y,t->output);
				fflush(logfile);
				tasks_done++;
			} else {
				fprintf(stderr,"unexpected output: %s\nfrom command: %s\non host: %s",t->output,t->command_line,t->host);
			}
		} else {
		    fprintf(stderr,"function failed return value (%i) result (%i) on host %s. output:\n%s\n",t->return_status,t->result,t->host,t->output);
		}
		work_queue_task_delete(t);
		if(work_queue_empty(queue))
		    break;
	}

	display_progress(queue);
	return 0;
}
Beispiel #9
0
int main(int argc, char **argv)
{
	signed char c;
	struct work_queue *q;
	int port = WORK_QUEUE_DEFAULT_PORT;
	static const char *port_file = NULL;
	int work_queue_master_mode = WORK_QUEUE_MASTER_MODE_STANDALONE;
	char *project = NULL;
	int priority = 0;

	debug_config("allpairs_master");

	extra_files_list = list_create();

	struct option long_options[] = {
		{"debug", required_argument, 0, 'd'},
		{"help",  no_argument, 0, 'h'},
		{"version", no_argument, 0, 'v'},
		{"port", required_argument, 0, 'p'},
		{"random-port", required_argument, 0, 'Z'},
		{"extra-args", required_argument, 0, 'e'},
		{"width", required_argument, 0, 'x'},
		{"height", required_argument, 0, 'y'},
		{"advertise", no_argument, 0, 'a'},    //deprecated, left here for backwards compatibility
		{"project-name", required_argument, 0, 'N'},
		{"debug-file", required_argument, 0, 'o'},
		{"output-file", required_argument, 0, 'O'},
		{"wqstats-file", required_argument, 0, 's'},
		{"input-file", required_argument, 0, 'f'},
		{"estimated-time", required_argument, 0, 't'},
		{"priority", required_argument, 0, 'P'},
        {0,0,0,0}
	};


	while((c = getopt_long(argc, argv, "ad:e:f:hN:p:P:t:vx:y:Z:O:o:s:", long_options, NULL)) >= 0) {
		switch (c) {
	    case 'a':
			work_queue_master_mode = WORK_QUEUE_MASTER_MODE_CATALOG;
			break;
		case 'd':
			debug_flags_set(optarg);
			break;
		case 'e':
			extra_arguments = optarg;
			break;
		case 'f':
			list_push_head(extra_files_list,optarg);
			break;
		case 'o':
			debug_config_file(optarg);
			break;
		case 'O':
			free(output_filename);
			output_filename=xxstrdup(optarg);
			break;
		case 's':
			free(wqstats_filename);
			wqstats_filename=xxstrdup(optarg);
			break;
		case 'h':
			show_help(progname);
			exit(0);
			break;
		case 'N':
			work_queue_master_mode = WORK_QUEUE_MASTER_MODE_CATALOG;
			free(project);
			project = xxstrdup(optarg);
			break;
		case 'p':
			port = atoi(optarg);
			break;
		case 'P':
			priority = atoi(optarg);
			break;
		case 't':
			compare_program_time = atof(optarg);
			break;
		case 'v':
			cctools_version_print(stdout, progname);
			exit(0);
			break;
		case 'x':
			xblock = atoi(optarg);
			break;
		case 'y':
			yblock = atoi(optarg);
			break;
		case 'Z':
			port_file = optarg;
			port = 0;
			break;
		default:
			show_help(progname);
			return 1;
		}
	}

	cctools_version_debug(D_DEBUG, argv[0]);

	if((argc - optind) < 3) {
		show_help(progname);
		exit(1);
	}

	struct text_list *seta = text_list_load(argv[optind]);
	if(!seta) {
		fprintf(stderr,"%s: couldn't open %s: %s\n",progname,argv[optind+1],strerror(errno));
		return 1;
	}

	fprintf(stdout, "%s: %s has %d elements\n",progname,argv[optind],text_list_size(seta));

	struct text_list *setb = text_list_load(argv[optind+1]);
	if(!setb) {
		fprintf(stderr,"%s: couldn't open %s: %s\n",progname,argv[optind+1],strerror(errno));
		return 1;
	}

	fprintf(stdout, "%s: %s has %d elements\n",progname,argv[optind+1],text_list_size(setb));

	if (!find_executable("allpairs_multicore","PATH",allpairs_multicore_program,sizeof(allpairs_multicore_program))) {
		fprintf(stderr,"%s: couldn't find allpairs_multicore in path\n",progname);
		return 1;
	}

	debug(D_DEBUG,"using multicore executable %s",allpairs_multicore_program);
	
	xstop = text_list_size(seta);
	ystop = text_list_size(setb);

	if(allpairs_compare_function_get(argv[optind+2])) {
		strcpy(allpairs_compare_program,argv[optind+2]);
		debug(D_DEBUG,"using internal function %s",allpairs_compare_program);
		use_external_program = 0;
	} else {
		if(!find_executable(argv[optind+2],"PATH",allpairs_compare_program,sizeof(allpairs_compare_program))) {
			fprintf(stderr,"%s: %s is neither an executable nor an internal comparison function.\n",progname,allpairs_compare_program);
			return 1;
		}
		debug(D_DEBUG,"using comparison executable %s",allpairs_compare_program);
		use_external_program = 1;
	}

	if(!xblock || !yblock) {
		estimate_block_size(seta,setb,&xblock,&yblock);
	}

	fprintf(stdout, "%s: using block size of %dx%d\n",progname,xblock,yblock);

	if(work_queue_master_mode == WORK_QUEUE_MASTER_MODE_CATALOG && !project) {
		fprintf(stderr, "allpairs: allpairs master running in catalog mode. Please use '-N' option to specify the name of this project.\n");
		fprintf(stderr, "allpairs: Run \"%s -h\" for help with options.\n", argv[0]);
		return 1;
	}

	q = work_queue_create(port);

	//Read the port the queue is actually running, in case we just called
	//work_queue_create(LINK_PORT_ANY)
	port  = work_queue_port(q);

	if(!q) {
		fprintf(stderr,"%s: could not create work queue on port %d: %s\n",progname,port,strerror(errno));
		return 1;
	}

	if(port_file)
		opts_write_port_file(port_file, port);

	if(wqstats_filename)
		work_queue_specify_log(q, wqstats_filename);	

	// advanced work queue options
	work_queue_specify_master_mode(q, work_queue_master_mode);
	work_queue_specify_name(q, project);
	work_queue_specify_priority(q, priority);

	fprintf(stdout, "%s: listening for workers on port %d...\n",progname,work_queue_port(q));

	while(1) {
		struct work_queue_task *task = NULL;
		while(work_queue_hungry(q)) {
			task = ap_task_create(seta,setb);
			if(task) {
				work_queue_submit(q, task);
			} else {
				break;
			}
		}

		if(!task && work_queue_empty(q)) break;

		task = work_queue_wait(q,5);
		if(task) task_complete(task);
	}

	work_queue_delete(q);

	return 0;
}
Beispiel #10
0
int main(int argc, char *argv[])
{
	struct work_queue *q;
	struct work_queue_task *t;
	int port = WORK_QUEUE_DEFAULT_PORT;
	int taskid;
	int i;
	char *gzip_path; 

	if(argc < 2) {
		printf("work_queue_example <file1> [file2] [file3] ...\n");
		printf("Each file given on the command line will be compressed using a remote worker.\n");
		return 0;
	}

	/*
	   Usually, we can execute the gzip utility by simply typing its name at a
	   terminal. However, this is not enough for work queue; we have to specify
	   precisely which files need to be transmitted to the workers. We record
	   the location of gzip in 'gzip_path', which is usually found in /bin/gzip
	   or /usr/bin/gzip. We use the 'access' function (from unistd.h standard C
	   library), and test the path for execution (X_OK) and reading (R_OK)
	   permissions. 
	 */
	gzip_path = "/bin/gzip";
	if(access(gzip_path, X_OK | R_OK) != 0) {
		gzip_path = "/usr/bin/gzip";
		if(access(gzip_path, X_OK | R_OK) != 0) {
			fprintf(stderr, "gzip was not found. Please modify the gzip_path variable accordingly. To determine the location of gzip, from the terminal type: which gzip (usual locations are /bin/gzip and /usr/bin/gzip)\n");
			exit(1);
		}
	}

	/* We create the tasks queue using the default port. If this port is
	 * already been used by another program, you can try setting port = 0 to
	 * use an available port.  */
	q = work_queue_create(port);
	if(!q) {
		printf("couldn't listen on port %d: %s\n", port, strerror(errno));
		return 1;
	}
	printf("listening on port %d...\n", work_queue_port(q));

	/* We create and dispatch a task for each filename given in the argument list */
	for(i = 1; i < argc; i++) {

		char infile[256], outfile[256], command[256];

		sprintf(infile, "%s", argv[i]);
		sprintf(outfile, "%s.gz", argv[i]);

		/* Note that we write ./gzip here, to guarantee that the gzip version
		 * we are using is the one being sent to the workers. */
		sprintf(command, "./gzip < %s > %s", infile, outfile);

		t = work_queue_task_create(command);

		/* gzip is the same across all tasks, so we can cache it in the
		 * workers. Note that when specifying a file, we have to name its local
		 * name (e.g. gzip_path), and its remote name (e.g. "gzip"). Unlike the
		 * following line, more often than not these are the same. */
		work_queue_task_specify_file(t, gzip_path, "gzip", WORK_QUEUE_INPUT, WORK_QUEUE_CACHE); 

		/* files to be compressed are different across all tasks, so we do not
		 * cache them. This is, of course, application specific. Sometimes you
		 * may want to cache an output file if is the input of a later task.*/
		work_queue_task_specify_file(t, infile, infile, WORK_QUEUE_INPUT, WORK_QUEUE_NOCACHE);
		work_queue_task_specify_file(t, outfile, outfile, WORK_QUEUE_OUTPUT, WORK_QUEUE_NOCACHE); 

		/* Once all files has been specified, we are ready to submit the task to the queue. */
		taskid = work_queue_submit(q, t);

		printf("submitted task (id# %d): %s\n", taskid, t->command_line);
	}

	printf("waiting for tasks to complete...\n");

	while(!work_queue_empty(q)) {

		/* Application specific code goes here ... */

		/* work_queue_wait waits at most 5 seconds for some task to return. */
		t = work_queue_wait(q, 5);

		if(t) {
			printf("task (id# %d) complete: %s (return code %d)\n", t->taskid, t->command_line, t->return_status);
			if(t->return_status != 0)
			{
				/* The task failed. Error handling (e.g., resubmit with new parameters) here. */
			}

			work_queue_task_delete(t);
		}

		/* Application specific code goes here ... */
	}

	printf("all tasks complete!\n");

	work_queue_delete(q);

	return 0;
}
int main(int argc, char **argv)
{
	char c;
	struct work_queue *q;
	int port = WORK_QUEUE_DEFAULT_PORT;

	extra_files_list = list_create();

	while((c = getopt(argc, argv, "e:f:t:x:y:p:N:E:d:vh")) != (char) -1) {
		switch (c) {
		case 'e':
			extra_arguments = optarg;
			break;
		case 'f':
			list_push_head(extra_files_list,optarg);
			break;
		case 't':
			compare_program_time = atof(optarg);
			break;
		case 'x':
			xblock = atoi(optarg);
			break;
		case 'y':
			yblock = atoi(optarg);
			break;
		case 'p':
			port = atoi(optarg);
			break;
		case 'N':
			setenv("WORK_QUEUE_NAME", optarg, 1);
			break;
		case 'E':
			setenv("WORK_QUEUE_PRIORITY", optarg, 1);
			break;
		case 'd':
			debug_flags_set(optarg);
			break;
		case 'v':
			show_version(progname);
			exit(0);
			break;
		case 'h':
			show_help(progname);
			exit(0);
			break;
		default:
			show_help(progname);
			return 1;
		}
	}

	if((argc - optind) < 3) {
		show_help(progname);
		exit(1);
	}

	struct text_list *seta = text_list_load(argv[optind]);
	if(!seta) {
		fprintf(stderr,"%s: couldn't open %s: %s\n",progname,argv[optind+1],strerror(errno));
		return 1;
	}

	fprintf(stderr, "%s: %s has %d elements\n",progname,argv[optind],text_list_size(seta));

	struct text_list *setb = text_list_load(argv[optind+1]);
	if(!setb) {
		fprintf(stderr,"%s: couldn't open %s: %s\n",progname,argv[optind+1],strerror(errno));
		return 1;
	}

	fprintf(stderr, "%s: %s has %d elements\n",progname,argv[optind+1],text_list_size(setb));

	if (!find_executable("allpairs_multicore","PATH",allpairs_multicore_program,sizeof(allpairs_multicore_program))) {
		fprintf(stderr,"%s: couldn't find allpairs_multicore in path\n",progname);
		return 1;
	}

	debug(D_DEBUG,"using multicore executable %s",allpairs_multicore_program);
	
	xstop = text_list_size(seta);
	ystop = text_list_size(setb);

	if(allpairs_compare_function_get(argv[optind+2])) {
		strcpy(allpairs_compare_program,argv[optind+2]);
		debug(D_DEBUG,"using internal function %s",allpairs_compare_program);
		use_external_program = 0;
	} else {
		if(!find_executable(argv[optind+2],"PATH",allpairs_compare_program,sizeof(allpairs_compare_program))) {
			fprintf(stderr,"%s: %s is neither an executable nor an internal comparison function.\n",progname,allpairs_compare_program);
			return 1;
		}
		debug(D_DEBUG,"using comparison executable %s",allpairs_compare_program);
		use_external_program = 1;
	}

	if(!xblock || !yblock) {
		estimate_block_size(seta,setb,&xblock,&yblock);
	}

	fprintf(stderr, "%s: using block size of %dx%d\n",progname,xblock,yblock);

	q = work_queue_create(port);
	if(!q) {
		fprintf(stderr,"%s: could not create work queue on port %d: %s\n",progname,port,strerror(errno));
		return 1;
	}

	fprintf(stderr, "%s: listening for workers on port %d...\n",progname,work_queue_port(q));

	while(1) {
		struct work_queue_task *task = NULL;
		while(work_queue_hungry(q)) {
			task = ap_task_create(seta,setb);
			if(task) {
				work_queue_submit(q, task);
			} else {
				break;
			}
		}

		if(!task && work_queue_empty(q)) break;

		task = work_queue_wait(q,5);
		if(task) task_complete(task);
	}

	work_queue_delete(q);

	return 0;
}
int main(int argc, char *argv[])
{
	struct work_queue *q;
	int port = WORK_QUEUE_DEFAULT_PORT;

	if(argc != 4) {
		printf("Usage: work_queue_workload_simulator <workload_spec> <logfile> <proj_name> \n");
		exit(1);
	}

	struct list *specs = get_workload_specs(argv[1]);
	if(!specs) {
		printf("Failed to load a non-empty workload specification.\n");
		exit(1);
	}

	created_files = list_create(); 
	if(!created_files) {
		printf("Failed to allocate memory for a list to store created files.\n");
		exit(1);
	}

	// open log file
	logfile = fopen(argv[2], "a");
	if(!logfile) {
		printf("Couldn't open logfile %s: %s\n", argv[2], strerror(errno));
		exit(1);
	}

	q = work_queue_create(port);
	if(!q) {
		printf("couldn't listen on port %d: %s\n", port, strerror(errno));
		goto fail;
		exit(1);
	}

	printf("listening on port %d...\n", work_queue_port(q));

	// specifying the right modes
	work_queue_specify_master_mode(q, WORK_QUEUE_MASTER_MODE_CATALOG);
	work_queue_specify_name(q, argv[3]);
	work_queue_specify_estimate_capacity_on(q, 1); // report capacity on

	int time_elapsed = 0; // in seconds 
	int series_id = 0;
	time_t start_time = time(0);
	log_work_queue_status(q);
	while(1) {
		struct task_series *ts = (struct task_series *)list_peek_tail(specs);
		if(!ts) {
			while(!work_queue_empty(q)) { // wait until all tasks to finish
				wait_for_task(q, 5);
			}
			break;
		} else {
			time_elapsed = time(0) - start_time;
			int time_until_next_submit = ts->submit_time - time_elapsed;
			if(time_until_next_submit <=0) {
				list_pop_tail(specs);
				printf("time elapsed: %d seconds\n", time_elapsed);
				if(!submit_task_series(q, ts, series_id)) {
					// failed to submit tasks
					fprintf(stderr, "Failed to submit tasks.\n");
					goto fail;
				}
				free(ts);
				series_id++;
			} else {
				time_t stoptime = start_time + ts->submit_time;
				while(!work_queue_empty(q)) {
					int timeout = stoptime - time(0);
					if(timeout > 0) {
						wait_for_task(q, timeout);
					} else {
						break;
					}
				}
				time_t current_time = time(0);
				if(current_time < stoptime) {
					sleep(stoptime - current_time);
				}
			}
		}
	}

	printf("all tasks complete!\n");
	work_queue_delete(q);
	remove_created_files();
	fclose(logfile);

	return 0;

fail:
	remove_created_files();
	fclose(logfile);
	exit(1);
}