mariadb/locktree/tests/locktree_escalation_1big7lt_1small.cc

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#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."

#include <stdio.h>
#include "locktree.h"
#include "test.h"

// ensure that small transactions do not get stalled by a big transaction that has lots of locks
// ./locktree_escalation_big7_small1 --stalls 100 --max_lock_memory 1000000000 --verbose

using namespace toku;

static int verbose = 0;
static int killed = 0;
static pthread_t big_id, small_id;

static void locktree_release_lock(locktree *lt, TXNID txn_id, int64_t left_k, int64_t right_k) {
    range_buffer buffer;
    buffer.create();
    DBT left; toku_fill_dbt(&left, &left_k, sizeof left_k);
    DBT right; toku_fill_dbt(&right, &right_k, sizeof right_k);
    buffer.append(&left, &right);
    lt->release_locks(txn_id, &buffer);
    buffer.destroy();
}

// grab a write range lock on int64 keys bounded by left_k and right_k
static int locktree_write_lock(locktree *lt, TXNID txn_id, int64_t left_k, int64_t right_k, bool big_txn) {
    DBT left; toku_fill_dbt(&left, &left_k, sizeof left_k);
    DBT right; toku_fill_dbt(&right, &right_k, sizeof right_k);
    return lt->acquire_write_lock(txn_id, &left, &right, nullptr, big_txn);
}

#if 0
static locktree **big_txn_lt;
static int n_big_txn_lt;

static int get_locktrees_touched_by_txn(TXNID txn_id UU(), void *txn_extra UU(), locktree ***ret_locktrees, int *ret_num_locktrees) {
    locktree **locktrees = (locktree **) toku_malloc(n_big_txn_lt * sizeof (locktree *));
    for (int i = 0; i < n_big_txn_lt; i++)
        locktrees[i] = big_txn_lt[i];
    *ret_locktrees = locktrees;
    *ret_num_locktrees = n_big_txn_lt;
    return 0;
}
#endif

static void run_big_txn(locktree::manager *mgr UU(), locktree **lt, int n_lt, TXNID txn_id) {
    int64_t last_i = -1;
    for (int64_t i = 0; !killed; i++) {
        for (int j = 0; j < n_lt; j++) {
            uint64_t t_start = toku_current_time_microsec();
            int r = locktree_write_lock(lt[j], txn_id, i, i, true);
            assert(r == 0);
            last_i = i;
            uint64_t t_end = toku_current_time_microsec();
            uint64_t t_duration = t_end - t_start;
            if (t_duration > 100000) {
                printf("%u %s %" PRId64 " %" PRIu64 "\n", toku_os_gettid(), __FUNCTION__, i, t_duration);
            }
        }
        toku_pthread_yield();
    }
    if (last_i != -1)
        for (int j = 0; j < n_lt; j++)
            locktree_release_lock(lt[j], txn_id, 0, last_i); // release the range 0 .. last_i
    if (verbose)
        printf("%u %s %" PRId64 "\n", toku_os_gettid(), __FUNCTION__, last_i);
}

struct big_arg {
    locktree::manager *mgr;
    locktree **lt;
    int n_lt;
    TXNID txn_id;
};

static void *big_f(void *_arg) {
    struct big_arg *arg = (struct big_arg *) _arg;
    assert(pthread_equal(pthread_self(), big_id));
    printf("%u %s\n", toku_os_gettid(), __FUNCTION__);
    run_big_txn(arg->mgr, arg->lt, arg->n_lt, arg->txn_id);
    return arg;
}

static void run_small_txn(locktree::manager *mgr UU(), locktree *lt, TXNID txn_id, int64_t k) {
    int64_t i;
    for (i = 0; !killed; i++) {
        uint64_t t_start = toku_current_time_microsec();
        int r = locktree_write_lock(lt, txn_id, k, k, false);
        assert(r == 0);
        uint64_t t_end = toku_current_time_microsec();
        uint64_t t_duration = t_end - t_start;
        if (t_duration > 100000) {
            printf("%u %s %" PRId64 " %" PRIu64 "\n", toku_os_gettid(), __FUNCTION__, i, t_duration);
        }
        locktree_release_lock(lt, txn_id, k, k);
        toku_pthread_yield();
    }
    if (verbose)
        printf("%u %s %" PRId64 "\n", toku_os_gettid(), __FUNCTION__, i);
}

struct small_arg {
    locktree::manager *mgr;
    locktree *lt;
    TXNID txn_id;
    int64_t k;
};

static void *small_f(void *_arg) {
    struct small_arg *arg = (struct small_arg *) _arg;
    printf("%u %s\n", toku_os_gettid(), __FUNCTION__);
    run_small_txn(arg->mgr, arg->lt, arg->txn_id, arg->k);
    return arg;
}

static void e_callback(TXNID txnid, const locktree *lt, const range_buffer &buffer, void *extra) {
    assert(pthread_equal(pthread_self(), big_id));
    if (verbose) 
        printf("%u %s %" PRIu64 " %p %d %p\n", toku_os_gettid(), __FUNCTION__, txnid, lt, buffer.get_num_ranges(), extra);
}

static uint64_t get_escalation_count(locktree::manager &mgr) {
    LTM_STATUS_S ltm_status;
    mgr.get_status(&ltm_status);

    TOKU_ENGINE_STATUS_ROW key_status = NULL;
    // lookup keyname in status
    for (int i = 0; ; i++) {
        TOKU_ENGINE_STATUS_ROW status = &ltm_status.status[i];
        if (status->keyname == NULL)
            break;
        if (strcmp(status->keyname, "LTM_ESCALATION_COUNT") == 0) {
            key_status = status;
            break;
        }
    }
    assert(key_status);
    return key_status->value.num;
}

int main(int argc, const char *argv[]) {
    uint64_t stalls = 1;
    int n_big = 7;
    uint64_t max_lock_memory = 1000000;

    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
            verbose++;
            continue;
        }
        if (strcmp(argv[i], "--stalls") == 0 && i+1 < argc) {
            stalls = atoll(argv[++i]);
            continue;
        }
        if (strcmp(argv[i], "--max_lock_memory") == 0 && i+1 < argc) {
            max_lock_memory = atoll(argv[++i]);
            continue;
        }
    }

    int r;

    // create a manager
    locktree::manager mgr;
    mgr.create(nullptr, nullptr, e_callback, nullptr);
    mgr.set_max_lock_memory(max_lock_memory);

    // create lock trees
    uint64_t next_dict_id = 1;
    DICTIONARY_ID dict_id;
    locktree *big_lt[n_big];
    for (int i = 0; i < n_big; i++) {
        dict_id = { next_dict_id }; next_dict_id++;
        big_lt[i] = mgr.get_lt(dict_id, nullptr, compare_dbts, nullptr);
    }

#if 0
    big_txn_lt = big_lt;
    n_big_txn_lt = n_big;
#endif

    dict_id = { next_dict_id }; next_dict_id++;
    locktree *small_lt = mgr.get_lt(dict_id, nullptr, compare_dbts, nullptr);

    // create the worker threads
    struct big_arg big_arg = { &mgr, big_lt, n_big, 1000 };
    r = toku_pthread_create(&big_id, nullptr, big_f, &big_arg);
    assert(r == 0);

    struct small_arg small_arg = { &mgr, small_lt, 2000, 0 };    
    r = toku_pthread_create(&small_id, nullptr, small_f, &small_arg);
    assert(r == 0);

    // wait for some escalations to occur
    while (get_escalation_count(mgr) < stalls) {
        sleep(1);
    }
    killed = 1;

    // cleanup
    void *ret;
    r = toku_pthread_join(big_id, &ret);
    assert(r == 0);

    r = toku_pthread_join(small_id, &ret);
    assert(r == 0);

    for (int i = 0; i < n_big; i++)
        mgr.release_lt(big_lt[i]);
    mgr.release_lt(small_lt);
    mgr.destroy();

    return 0;
}