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boinc/sched/feeder.C

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// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// -------------------------------
//
// feeder [-asynch] [-d debug_level] [-random_order | -priority_order]
// -asynch fork and run in a separate process
//
// Creates a shared memory segment containing DB info,
// including the work array (results/workunits to send).
//
// Try to keep the work array filled.
// This is a little tricky.
// We use an enumerator.
// The inner loop scans the wu_result table,
// looking for empty slots and trying to fill them in.
// When the enumerator reaches the end, it is restarted;
// hopefully there will be some new workunits.
// There are two complications:
//
// - An enumeration may return results already in the array.
// So, for each result, we scan the entire array to make sure
// it's not there already. Can this be streamlined?
//
// - We must avoid excessive re-enumeration,
// especially when the number of results is less than the array size.
// Crude approach: if a "collision" (as above) occurred on
// a pass through the array, wait a long time (5 sec)
//
// Checking for infeasible results (i.e. can't sent to any host):
//
// - the "infeasible_count" field of WU_RESULT keeps track of
// how many times the WU_RESULT was infeasible for a host
//
// - the scheduler gives priority to results that have infeasible_count > 0
//
// - If the infeasible_count of any result exceeds MAX_INFEASIBLE_COUNT,
// the feeder flags the result as OVER with outcome COULDNT_SEND,
// and flags the WU for the transitioner.
//
// - the feeder tries to ensure that the number of WU_RESULTs
// with infeasible_count > MAX_INFEASIBLE_THRESHOLD
// doesn't exceed MAX_INFEASIBLE (defined in sched_shmem.h)
// If it does, then the feeder picks the WU_RESULT with
// the largest infeasible_count, marks if COULDNT_SEND as above,
// and repeats this until the infeasible count is low enough again
// Trigger files:
// The feeder program periodically checks for two trigger files:
//
// stop_server: destroy shmem and exit
// leave trigger file there (for other daemons)
// reread_db: update DB contents in existing shmem
// delete trigger file
// If you get an "Invalid argument" error when trying to run the feeder,
// it is likely that you aren't able to allocate enough shared memory.
// Either increase the maximum shared memory segment size in the kernel
// configuration, or decrease the MAX_PLATFORMS, MAX_APPS
// MAX_APP_VERSIONS, and MAX_WU_RESULTS in sched_shmem.h
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "boinc_db.h"
#include "shmem.h"
#include "synch.h"
#include "util.h"
#include "sched_config.h"
#include "sched_shmem.h"
#include "sched_util.h"
#include "sched_msgs.h"
#define SLEEP_INTERVAL 5
#define ENUM_LIMIT 1000
// The following parameters determine the feeder's policy
// for purging "infeasible" results,
// i.e. those that are hard to send to any client.
// TODO: remove these from the source code,
// make them config.xml parameters
#define MAX_INFEASIBLE_THRESHOLD 2000
// if a result's infeasible_count exceeds this,
// count it as "possibly infeasible" (see the following)
// TODO: lower this to 20 or so
#define MAX_INFEASIBLE 500
// if # of possibly infeasibly results exceeds this,
// classify some of them as COULDNT_SEND and remove from array
#define MAX_INFEASIBLE_COUNT 5000
// a result's infeasible_count exceeds this,
// classify as COULDNT_SEND and remove it from array
// TODO: lower this to 50 or so
// Uncomment the following to enable this purging.
//
//#define REMOVE_INFEASIBLE_ENTRIES
#define REREAD_DB_FILENAME "reread_db"
#define LOCKFILE "feeder.out"
#define PIDFILE "feeder.pid"
SCHED_CONFIG config;
SCHED_SHMEM* ssp;
key_t sema_key;
const char* order_clause="";
void cleanup_shmem() {
detach_shmem((void*)ssp);
destroy_shmem(config.shmem_key);
}
int check_reread_trigger() {
FILE* f;
f = fopen(REREAD_DB_FILENAME, "r");
if (f) {
fclose(f);
ssp->init();
ssp->scan_tables();
unlink(REREAD_DB_FILENAME);
}
return 0;
}
#ifdef REMOVE_INFEASIBLE_ENTRIES
static int remove_infeasible(int i) {
char buf[256];
int retval;
DB_RESULT result;
DB_WORKUNIT wu;
WU_RESULT& wu_result = ssp->wu_results[i];
wu_result.state = WR_STATE_EMPTY;
result = wu_result.result;
wu = wu_result.workunit;
log_messages.printf(
SCHED_MSG_LOG::NORMAL,
"[%s] declaring result as unsendable; infeasible count %d\n",
result.name, wu_result.infeasible_count
);
result.server_state = RESULT_SERVER_STATE_OVER;
result.outcome = RESULT_OUTCOME_COULDNT_SEND;
sprintf(
buf, "server_state=%d, outcome=%d",
result.server_state, result.outcome
);
retval = result.update_field(buf);
if (retval) {
log_messages.printf(
SCHED_MSG_LOG::CRITICAL,
"[%s]: can't update: %d\n",
result.name, retval
);
return retval;
}
wu.transition_time = time(0);
sprintf(buf, "transition_time=%d", wu.transition_time);
retval = wu.update_field(buf);
if (retval) {
log_messages.printf(
SCHED_MSG_LOG::CRITICAL,
"[%s]: can't update: %d\n",
wu.name, retval
);
return retval;
}
return 0;
}
#endif
static void scan_work_array(
DB_WORK_ITEM& wi,
int& nadditions, int& ncollisions, int& /*ninfeasible*/,
bool& no_wus
) {
int i, j, retval;
bool collision, restarted_enum = false;
for (i=0; i<ssp->nwu_results; i++) {
WU_RESULT& wu_result = ssp->wu_results[i];
switch (wu_result.state) {
case WR_STATE_CHECKED_OUT:
break;
#ifdef REMOVE_INFEASIBLE_ENTRIES
case WR_STATE_PRESENT:
if (wu_result.infeasible_count > MAX_INFEASIBLE_COUNT) {
remove_infeasible(i);
} else if (wu_result.infeasible_count > MAX_INFEASIBLE_THRESHOLD) {
ninfeasible++;
}
break;
#endif
case WR_STATE_EMPTY:
retval = wi.enumerate(ENUM_LIMIT, order_clause);
if (retval) {
// if we already restarted the enum on this array scan,
// there's no point in doing it again.
//
if (restarted_enum) {
log_messages.printf(SCHED_MSG_LOG::DEBUG,
"already restarted enum on this array scan\n"
);
return;
}
// restart the enumeration
//
restarted_enum = true;
retval = wi.enumerate(ENUM_LIMIT, order_clause);
log_messages.printf(SCHED_MSG_LOG::DEBUG,
"restarting enumeration\n"
);
if (retval) {
log_messages.printf(SCHED_MSG_LOG::DEBUG,
"enumeration restart returned nothing\n"
);
no_wus = true;
return;
}
}
// at this point "wi" has an item
if (!ssp->have_app(wi.wu.appid)) {
log_messages.printf(
SCHED_MSG_LOG::CRITICAL,
"result [RESULT#%d] has bad appid %d; clean up your DB!\n",
wi.res_id, wi.wu.appid
);
exit(1);
}
collision = false;
for (j=0; j<ssp->nwu_results; j++) {
if (ssp->wu_results[j].state != WR_STATE_EMPTY
&& ssp->wu_results[j].resultid == wi.res_id
) {
ncollisions++;
collision = true;
break;
}
}
if (!collision) {
log_messages.printf(
SCHED_MSG_LOG::NORMAL,
"adding result [RESULT#%d] in slot %d\n",
wi.res_id, i
);
wu_result.resultid = wi.res_id;
wu_result.workunit = wi.wu;
wu_result.state = WR_STATE_PRESENT;
wu_result.infeasible_count = 0;
nadditions++;
}
break;
default:
// here the state is a PID; see if it's still alive
//
int pid = wu_result.state;
struct stat s;
char buf[256];
sprintf(buf, "/proc/%d", pid);
if (stat(buf, &s)) {
wu_result.state = WR_STATE_PRESENT;
log_messages.printf(
SCHED_MSG_LOG::NORMAL,
"Result reserved by non-existent process; resetting\n"
);
}
}
}
}
#ifdef REMOVE_INFEASIBLE_ENTRIES
static int remove_most_infeasible() {
int i, max, imax=-1;
max = 0;
for (i=0; i<ssp->nwu_results; i++) {
WU_RESULT& wu_result = ssp->wu_results[i];
if (wu_result.state == WR_STATE_PRESENT && wu_result.infeasible_count > max) {
imax = i;
max = wu_result.infeasible_count;
}
}
if (max == 0) return -1; // nothing is infeasible
return remove_infeasible(imax);
}
#endif
void feeder_loop() {
int nadditions, ncollisions, ninfeasible;
DB_WORK_ITEM wi;
bool no_wus;
while (1) {
nadditions = 0;
ncollisions = 0;
ninfeasible = 0;
no_wus = false;
scan_work_array(
wi, nadditions, ncollisions, ninfeasible, no_wus
);
ssp->ready = true;
#ifdef REMOVE_INFEASIBLE_ENTRIES
int i, n, retval;
if (ninfeasible > MAX_INFEASIBLE) {
n = ninfeasible - MAX_INFEASIBLE;
for (i=0; i<n; i++ ) {
retval = remove_most_infeasible();
if (retval) break;
}
}
#endif
if (nadditions == 0) {
log_messages.printf(SCHED_MSG_LOG::DEBUG, "No results added; sleeping %d sec\n", SLEEP_INTERVAL);
sleep(SLEEP_INTERVAL);
} else {
log_messages.printf(SCHED_MSG_LOG::DEBUG, "Added %d results to array\n", nadditions);
}
if (no_wus) {
log_messages.printf(SCHED_MSG_LOG::DEBUG, "No results available; sleeping %d sec\n", SLEEP_INTERVAL);
sleep(SLEEP_INTERVAL);
}
if (ncollisions) {
log_messages.printf(SCHED_MSG_LOG::DEBUG, "Some results already in array - sleeping %d sec\n", SLEEP_INTERVAL);
sleep(SLEEP_INTERVAL);
}
fflush(stdout);
check_stop_daemons();
check_reread_trigger();
}
}
int main(int argc, char** argv) {
int i, retval;
bool asynch = false;
void* p;
char path[256];
unlink(REREAD_DB_FILENAME);
retval = config.parse_file("..");
if (retval) {
log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't parse config file\n");
exit(1);
}
for (i=1; i<argc; i++) {
if (!strcmp(argv[i], "-asynch")) {
asynch = true;
} else if (!strcmp(argv[i], "-d")) {
log_messages.set_debug_level(atoi(argv[++i]));
} else if (!strcmp(argv[i], "-random_order")) {
order_clause = "order by random ";
} else if (!strcmp(argv[i], "-priority_order")) {
order_clause = "order by priority desc ";
}
}
if (asynch) {
if (fork()!=0) {
exit(0);
}
}
log_messages.printf(SCHED_MSG_LOG::NORMAL, "Starting\n");
get_project_dir(path, sizeof(path));
get_key(path, 'a', sema_key);
destroy_semaphore(sema_key);
create_semaphore(sema_key);
retval = destroy_shmem(config.shmem_key);
if (retval) {
log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't destroy shmem\n");
exit(1);
}
retval = create_shmem(config.shmem_key, sizeof(SCHED_SHMEM), &p);
if (retval) {
log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't create shmem\n");
exit(1);
}
ssp = (SCHED_SHMEM*)p;
ssp->init();
atexit(cleanup_shmem);
install_stop_signal_handler();
retval = boinc_db.open(config.db_name, config.db_host, config.db_user, config.db_passwd);
if (retval) {
log_messages.printf(SCHED_MSG_LOG::CRITICAL, "boinc_db.open: %d; %s\n", retval, boinc_db.error_string());
exit(1);
}
ssp->scan_tables();
log_messages.printf(
SCHED_MSG_LOG::NORMAL,
"feeder: read "
"%d platforms, "
"%d apps, "
"%d app_versions\n",
ssp->nplatforms,
ssp->napps,
ssp->napp_versions
);
feeder_loop();
}
const char *BOINC_RCSID_57c87aa242 = "$Id$";
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