loop.c

/*
 *   Copyright (c) 2019, Nokia Solutions and Networks
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file
 *
 * Event Machine performance test example
 *
 * Measures the average cycles consumed during an event send-sched-receive loop
 * for a certain number of EOs in the system. The test has a number of EOs, each
 * with one queue. Each EO receives events through its dedicated queue and
 * sends them right back into the same queue, thus looping the events.
 *
 * Based on the 'pairs' performance test, but instead of forwarding events
 * between queues, here we loop them back into the same queue (which is usually
 * faster). Also 'loop' only uses one queue priority level.
 */
 
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
 
#include <event_machine.h>
#include <event_machine/platform/env/environment.h>
 
#include "cm_setup.h"
#include "cm_error_handler.h"
 
/*
 * Test configuration
 */
 
/** Number of test EOs and queues. Must be an even number. */
#define NUM_EO  128
 
/** Number of events per queue */
#define NUM_EVENT_PER_QUEUE  32  /* Increase the value to tune performance */
 
/** sizeof data[DATA_SIZE] in bytes in the event payload */
#define DATA_SIZE  250
 
/** Max number of cores */
#define MAX_NBR_OF_CORES  256
 
/** The number of events to be received before printing a result */
#define PRINT_EVENT_COUNT  0xff0000
 
/** EM Queue type used */
#define QUEUE_TYPE  EM_QUEUE_TYPE_ATOMIC
 
/** Define how many events are sent per em_send_multi() call */
#define SEND_MULTI_MAX 32
 
/*
 * Options
 */
 
/** Alloc and free per event */
#define ALLOC_FREE_PER_EVENT  0 /* 0=False or 1=True */
 
/* Result APPL_PRINT() format string */
#define RESULT_PRINTF_FMT \
"cycles/event:% -8.2f  Mevents/s/core: %-6.2f %5.0f MHz  core%02d %" PRIu64 "\n"
 
/**
 * Performance test statistics (per core)
 */
typedef struct {
        int64_t events;
        uint64_t begin_cycles;
        uint64_t end_cycles;
        uint64_t print_count;
} perf_stat_t;
 
/**
 * Performance test event
 */
typedef struct {
        uint8_t data[DATA_SIZE];
} perf_event_t;
 
/**
 * Perf test shared memory, read-only after start-up, allow cache-line sharing
 */
typedef struct {
        /* EO table */
        em_eo_t eo_tbl[NUM_EO];
        /* Event pool used by this application */
        em_pool_t pool;
} perf_shm_t;
 
/** EM-core local pointer to shared memory */
static ENV_LOCAL perf_shm_t *perf_shm;
/**
 * Core specific test statistics.
 *
 * Allow for 'PRINT_EVENT_COUNT' warm-up rounds,
 * incremented per core during receive, measurement starts at 0.
 */
static ENV_LOCAL perf_stat_t core_stat = {.events = -PRINT_EVENT_COUNT};
 
/*
 * Local function prototypes
 */
 
static em_status_t
perf_start(void *eo_context, em_eo_t eo, const em_eo_conf_t *conf);
 
static em_status_t
perf_stop(void *eo_context, em_eo_t eo);
 
static void
perf_receive(void *eo_context, em_event_t event, em_event_type_t type,
             em_queue_t queue, void *q_ctx);
 
static void
print_result(perf_stat_t *const perf_stat);
 
/**
 * Main function
 *
 * Call cm_setup() to perform test & EM setup common for all the
 * test applications.
 *
 * cm_setup() will call test_init() and test_start() and launch
 * the EM dispatch loop on every EM-core.
 */
int main(int argc, char *argv[])
{
        return cm_setup(argc, argv);
}
 
/**
 * Init of the Loop performance test application.
 *
 * @attention Run on all cores.
 *
 * @see cm_setup() for setup and dispatch.
 */
void test_init(const appl_conf_t *appl_conf)
{
        (void)appl_conf;
        int core = em_core_id();
 
        if (core == 0) {
                perf_shm = env_shared_reserve("PerfSharedMem",
                                              sizeof(perf_shm_t));
                em_register_error_handler(test_error_handler);
        } else {
                perf_shm = env_shared_lookup("PerfSharedMem");
        }
 
        if (perf_shm == NULL)
                test_error(EM_ERROR_SET_FATAL(0xec0de), 0xdead,
                           "Perf init failed on EM-core:%u", em_core_id());
        else if (core == 0)
                memset(perf_shm, 0, sizeof(perf_shm_t));
}
 
/**
 * Startup of the Loop performance test application.
 *
 * @attention Run only on EM core 0.
 *
 * @param appl_conf Application configuration
 *
 * @see cm_setup() for setup and dispatch.
 */
void test_start(const appl_conf_t *appl_conf)
{
        /*
         * Store the event pool to use, use the EM default pool if no other
         * pool is provided through the appl_conf.
         */
        if (appl_conf->num_pools >= 1)
                perf_shm->pool = appl_conf->pools[0];
        else
                perf_shm->pool = EM_POOL_DEFAULT;
 
        APPL_PRINT("\n"
                   "***********************************************************\n"
                   "EM APPLICATION: '%s' initializing:\n"
                   "  %s: %s() - EM-core:%d\n"
                   "  Application running on %u EM-cores (procs:%u, threads:%u)\n"
                   "  using event pool:%" PRI_POOL "\n"
                   "***********************************************************\n"
                   "\n",
                   appl_conf->name, NO_PATH(__FILE__), __func__, em_core_id(),
                   appl_conf->core_count, appl_conf->num_procs, appl_conf->num_threads,
                   perf_shm->pool);
 
        test_fatal_if(perf_shm->pool == EM_POOL_UNDEF,
                      "Undefined application event pool!");
 
        /*
         * Create and start application EOs
         * Send initial test events to the EOs' queues
         */
        em_queue_t queues[NUM_EO];
 
        for (int i = 0; i < NUM_EO; i++) {
                em_queue_t queue;
                em_eo_t eo;
                em_status_t ret, start_ret = EM_ERROR;
 
                /* Create the EO's loop queue */
                queue = em_queue_create("queue A", QUEUE_TYPE,
                                        EM_QUEUE_PRIO_NORMAL,
                                        EM_QUEUE_GROUP_DEFAULT, NULL);
                test_fatal_if(queue == EM_QUEUE_UNDEF,
                              "Queue creation failed, round:%d", i);
                queues[i] = queue;
 
                /* Create the EO */
                eo = em_eo_create("loop-eo", perf_start, NULL, perf_stop, NULL,
                                  perf_receive, NULL);
                test_fatal_if(eo == EM_EO_UNDEF,
                              "EO(%d) creation failed!", i);
                perf_shm->eo_tbl[i] = eo;
 
                ret = em_eo_add_queue_sync(eo, queue);
                test_fatal_if(ret != EM_OK,
                              "EO add queue:%" PRI_STAT "\n"
                              "EO:%" PRI_EO " Queue:%" PRI_QUEUE "",
                              ret, eo, queue);
 
                ret = em_eo_start_sync(eo, &start_ret, NULL);
                test_fatal_if(ret != EM_OK || start_ret != EM_OK,
                              "EO start:%" PRI_STAT " %" PRI_STAT "",
                              ret, start_ret);
        }
 
        for (int i = 0; i < NUM_EO; i++) {
                em_queue_t queue = queues[i];
                em_event_t events[NUM_EVENT_PER_QUEUE];
 
                /* Alloc and send test events */
                for (int j = 0; j < NUM_EVENT_PER_QUEUE; j++) {
                        em_event_t ev;
 
                        ev = em_alloc(sizeof(perf_event_t),
                                      EM_EVENT_TYPE_SW, perf_shm->pool);
                        test_fatal_if(ev == EM_EVENT_UNDEF,
                                      "Event allocation failed (%d, %d)", i, j);
                        events[j] = ev;
                }
 
                /* Send in bursts of 'SEND_MULTI_MAX' events */
                const int send_rounds = NUM_EVENT_PER_QUEUE / SEND_MULTI_MAX;
                const int left_over = NUM_EVENT_PER_QUEUE % SEND_MULTI_MAX;
                int num_sent = 0;
                int m, n;
 
                for (m = 0, n = 0; m < send_rounds; m++, n += SEND_MULTI_MAX) {
                        num_sent += em_send_multi(&events[n], SEND_MULTI_MAX,
                                                  queue);
                }
                if (left_over) {
                        num_sent += em_send_multi(&events[n], left_over,
                                          queue);
                }
                test_fatal_if(num_sent != NUM_EVENT_PER_QUEUE,
                              "Event send multi failed:%d (%d)\n"
                              "Q:%" PRI_QUEUE "",
                              num_sent, NUM_EVENT_PER_QUEUE, queue);
        }
 
        env_sync_mem();
}
 
void test_stop(const appl_conf_t *appl_conf)
{
        const int core = em_core_id();
        em_eo_t eo;
        em_status_t ret;
        int i;
 
        (void)appl_conf;
 
        APPL_PRINT("%s() on EM-core %d\n", __func__, core);
 
        for (i = 0; i < NUM_EO; i++) {
                /* Stop & delete EO */
                eo = perf_shm->eo_tbl[i];
 
                ret = em_eo_stop_sync(eo);
                test_fatal_if(ret != EM_OK,
                              "EO:%" PRI_EO " stop:%" PRI_STAT "", eo, ret);
 
                ret = em_eo_delete(eo);
                test_fatal_if(ret != EM_OK,
                              "EO:%" PRI_EO " delete:%" PRI_STAT "", eo, ret);
        }
}
 
void test_term(const appl_conf_t *appl_conf)
{
        (void)appl_conf;
        const int core = em_core_id();
 
        APPL_PRINT("%s() on EM-core %d\n", __func__, core);
 
        if (core == 0) {
                env_shared_free(perf_shm);
                em_unregister_error_handler();
        }
}
 
/**
 * @private
 *
 * EO start function.
 *
 */
static em_status_t
perf_start(void *eo_context, em_eo_t eo, const em_eo_conf_t *conf)
{
        (void)eo_context;
        (void)eo;
        (void)conf;
 
        return EM_OK;
}
 
/**
 * @private
 *
 * EO stop function.
 *
 */
static em_status_t
perf_stop(void *eo_context, em_eo_t eo)
{
        em_status_t ret;
 
        (void)eo_context;
 
        /* remove and delete all of the EO's queues */
        ret = em_eo_remove_queue_all_sync(eo, EM_TRUE);
        test_fatal_if(ret != EM_OK,
                      "EO remove queue all:%" PRI_STAT " EO:%" PRI_EO "",
                      ret, eo);
        return ret;
}
 
/**
 * @private
 *
 * EO receive function for EO A.
 *
 * Loops back events and calculates the event rate.
 */
static void
perf_receive(void *eo_context, em_event_t event, em_event_type_t type,
             em_queue_t queue, void *queue_context)
{
        int64_t events = core_stat.events;
        em_status_t ret;
 
        (void)eo_context;
        (void)type;
        (void)queue_context;
 
        if (unlikely(appl_shm->exit_flag)) {
                em_free(event);
                return;
        }
 
        if (unlikely(events == 0)) {
                /* Start the measurement */
                core_stat.begin_cycles = env_get_cycle();
        } else if (unlikely(events == PRINT_EVENT_COUNT)) {
                /* End the measurement */
                core_stat.end_cycles = env_get_cycle();
                /* Print results and restart */
                core_stat.print_count += 1;
                print_result(&core_stat);
                /* Restart the measurement next round */
                events = -1; /* +1 below => 0 */
        }
 
        if (ALLOC_FREE_PER_EVENT) {
                em_free(event);
                event = em_alloc(sizeof(perf_event_t), EM_EVENT_TYPE_SW,
                                 perf_shm->pool);
                test_fatal_if(event == EM_EVENT_UNDEF, "Event alloc fails");
        }
 
        /* Send the event back into the queue it originated from, i.e. loop */
        ret = em_send(event, queue);
        if (unlikely(ret != EM_OK)) {
                em_free(event);
                test_fatal_if(!appl_shm->exit_flag,
                              "Send:%" PRI_STAT " Queue:%" PRI_QUEUE "",
                              ret, queue);
        }
 
        events++;
        core_stat.events = events;
}
 
/**
 * Prints test measurement result
 */
static void
print_result(perf_stat_t *const perf_stat)
{
        uint64_t diff;
        uint32_t hz;
        double mhz;
        double cycles_per_event, events_per_sec;
        uint64_t print_count;
 
        hz = env_core_hz();
        mhz = ((double)hz) / 1000000.0;
 
        diff = env_cycles_diff(perf_stat->end_cycles, perf_stat->begin_cycles);
 
        print_count = perf_stat->print_count;
        cycles_per_event = ((double)diff) / ((double)perf_stat->events);
        events_per_sec = mhz / cycles_per_event; /* Million events/s */
 
        APPL_PRINT(RESULT_PRINTF_FMT, cycles_per_event, events_per_sec,
                   mhz, em_core_id(), print_count);
}