mariadb/examples/db-scan.c

/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
COPYING CONDITIONS NOTICE:

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below).

      * Redistributions in binary form must reproduce this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below) in the documentation and/or other materials
        provided with the distribution.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.

COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program 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
  General Public License for more details.

UNIVERSITY PATENT NOTICE:

  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.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.

PATENT RIGHTS GRANT:

  "THIS IMPLEMENTATION" means the copyrightable works distributed by
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  licensable by Tokutek, both currently or in the future; and that in
  the absence of this license would be infringed by THIS
  IMPLEMENTATION or by using or running THIS IMPLEMENTATION.

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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."

/* Scan the bench.tokudb/bench.db over and over. */
#define DONT_DEPRECATE_MALLOC

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <inttypes.h>
#ifdef BDB
#include <db.h>
#define DIRSUF bdb
#else
#include <tokudb.h>
#define DIRSUF tokudb
#endif
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>

static const char *pname;
static enum run_mode { RUN_HWC, RUN_LWC, RUN_VERIFY, RUN_RANGE} run_mode = RUN_HWC;
static int do_txns=1, prelock=0, prelockflag=0;
static u_int32_t lock_flag = 0;
static long limitcount=-1;
static u_int32_t cachesize = 127*1024*1024;
static u_int64_t start_range = 0, end_range = 0;
static int n_experiments = 2;
static int bulk_fetch = 1;

static int print_usage (const char *argv0) {
    fprintf(stderr, "Usage:\n%s [--verify-lwc | --lwc | --nohwc] [--prelock] [--prelockflag] [--prelockwriteflag] [--env DIR]\n", argv0);
    fprintf(stderr, "  --verify-lwc        means to run the light weight cursor and the heavyweight cursor to verify that they get the same answer.\n");
    fprintf(stderr, "  --lwc               run light weight cursors instead of heavy weight cursors\n");
    fprintf(stderr, "  --prelock           acquire a read lock on the entire table before running\n");
    fprintf(stderr, "  --prelockflag       pass DB_PRELOCKED to the the cursor get operation whenever the locks have been acquired\n");
    fprintf(stderr, "  --prelockwriteflag  pass DB_PRELOCKED_WRITE to the cursor get operation\n");
    fprintf(stderr, "  --nox               no transactions (no locking)\n");
    fprintf(stderr, "  --count COUNT       read the first COUNT rows and then  stop.\n");
    fprintf(stderr, "  --cachesize N       set the env cachesize to N bytes\n");
    fprintf(stderr, "  --srandom N         srandom(N)\n");
    fprintf(stderr, "  --env DIR           put db files in DIR instead of default\n");
    fprintf(stderr, "  --bulk_fetch 0|1    do bulk fetch on lwc operations (default: 1)\n");
    return 1;
}

static DB_ENV *env;
static DB *db;
static DB_TXN *tid=0;

#define STRINGIFY2(s) #s
#define STRINGIFY(s) STRINGIFY2(s)
static const char *dbdir = "./bench."  STRINGIFY(DIRSUF); /* DIRSUF is passed in as a -D argument to the compiler. */
static int env_open_flags_yesx = DB_CREATE|DB_PRIVATE|DB_INIT_MPOOL|DB_INIT_TXN|DB_INIT_LOG|DB_INIT_LOCK;
static int env_open_flags_nox = DB_CREATE|DB_PRIVATE|DB_INIT_MPOOL;
static char *dbfilename = "bench.db";


static void parse_args (int argc, const char *argv[]) {
    pname=argv[0];
    argc--; argv++;
    int specified_run_mode=0;
    while (argc>0) {
        if (strcmp(*argv,"--verify-lwc")==0) {
            if (specified_run_mode && run_mode!=RUN_VERIFY) { two_modes: fprintf(stderr, "You specified two run modes\n"); exit(1); }
            run_mode = RUN_VERIFY;
        } else if (strcmp(*argv, "--lwc")==0)  {
            if (specified_run_mode && run_mode!=RUN_LWC) goto two_modes;
            run_mode = RUN_LWC;
        } else if (strcmp(*argv, "--hwc")==0)  {
            if (specified_run_mode && run_mode!=RUN_VERIFY) goto two_modes;
            run_mode = RUN_HWC;
        } else if (strcmp(*argv, "--prelock")==0) prelock=1;
#ifdef TOKUDB
        else if (strcmp(*argv, "--prelockflag")==0)      { prelockflag=1; lock_flag = DB_PRELOCKED; }
        else if (strcmp(*argv, "--prelockwriteflag")==0) { prelockflag=1; lock_flag = DB_PRELOCKED_WRITE; }
#endif
        else if (strcmp(*argv, "--nox")==0)              { do_txns=0; }
        else if (strcmp(*argv, "--count")==0)            {
            char *end;
            argc--; argv++; 
            errno=0; limitcount=strtol(*argv, &end, 10); assert(errno==0);
            printf("Limiting count to %ld\n", limitcount);
        } else if (strcmp(*argv, "--cachesize")==0 && argc>0) {
            char *end;
            argc--; argv++; 
            cachesize=(u_int32_t)strtol(*argv, &end, 10);
        } else if (strcmp(*argv, "--env") == 0) {
            argc--; argv++;
            if (argc==0) exit(print_usage(pname));
            dbdir = *argv;
        } else if (strcmp(*argv, "--range") == 0 && argc > 2) {
            run_mode = RUN_RANGE;
            argc--; argv++;
            start_range = strtoll(*argv, NULL, 10);
            argc--; argv++;
            end_range = strtoll(*argv, NULL, 10);
        } else if (strcmp(*argv, "--experiments") == 0 && argc > 1) {
            argc--; argv++;
            n_experiments = strtol(*argv, NULL, 10);
        } else if (strcmp(*argv, "--srandom") == 0 && argc > 1) {
            argc--; argv++;
            srandom(atoi(*argv));
        } else if (strcmp(*argv, "--bulk_fetch") == 0 && argc > 1) {
            argc--; argv++;
            bulk_fetch = atoi(*argv);
        } else {
            exit(print_usage(pname));
    }
    argc--; argv++;
    }
    //Prelocking is meaningless without transactions
    if (do_txns==0) {
        prelockflag=0;
        lock_flag=0;
        prelock=0;
    }
}

static void scanscan_setup (void) {
    int r;
    r = db_env_create(&env, 0);                                                           assert(r==0);
    r = env->set_cachesize(env, 0, cachesize, 1);                                         assert(r==0);
    r = env->open(env, dbdir, do_txns? env_open_flags_yesx : env_open_flags_nox, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);   assert(r==0);
    r = db_create(&db, env, 0);                                                           assert(r==0);
    if (do_txns) {
        r = env->txn_begin(env, 0, &tid, 0);                                              assert(r==0);
    }
    r = db->open(db, tid, dbfilename, NULL, DB_BTREE, 0, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);                           assert(r==0);
#ifdef TOKUDB
    if (prelock) {
        r = db->pre_acquire_table_lock(db, tid);
        assert(r==0);
    }
#endif
}

static void scanscan_shutdown (void) {
    int r;
    r = db->close(db, 0);                                       assert(r==0);
    if (do_txns) {
        r = tid->commit(tid, 0);                                assert(r==0);
    }
    r = env->close(env, 0);                                     assert(r==0);
}

static double gettime (void) {
    struct timeval tv;
    int r = gettimeofday(&tv, 0);
    assert(r==0);
    return tv.tv_sec + 1e-6*tv.tv_usec;
}

static void scanscan_hwc (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
        long long totalbytes=0;
        int rowcounter=0;
        double prevtime = gettime();
        DBT k,v;
        DBC *dbc;
        r = db->cursor(db, tid, &dbc, 0);                           assert(r==0);
        memset(&k, 0, sizeof(k));
        memset(&v, 0, sizeof(v));
        u_int32_t c_get_flags = DB_NEXT;
        if (prelockflag && (counter || prelock)) {
            c_get_flags |= lock_flag;
        }
        while (0 == (r = dbc->c_get(dbc, &k, &v, c_get_flags))) {
        
            //printf("r=%d\n", r);

            totalbytes += k.size + v.size;
            rowcounter++;
            if (limitcount>0 && rowcounter>=limitcount) break;
        }
        assert(r==DB_NOTFOUND);
        r = dbc->c_close(dbc);                                      assert(r==0);
        double thistime = gettime();
        double tdiff = thistime-prevtime;
        printf("Scan    %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", totalbytes, rowcounter, tdiff, 1e-6*totalbytes/tdiff);
    }
}

#ifdef TOKUDB

struct extra_count {
    long long totalbytes;
    int rowcounter;
};

static int counttotalbytes (DBT const *key, DBT const *data, void *extrav) {
    struct extra_count *e=extrav;
    e->totalbytes += key->size + data->size;
    e->rowcounter++;
    return bulk_fetch ? TOKUDB_CURSOR_CONTINUE : 0;
}

static void scanscan_lwc (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
        struct extra_count e = {0,0};
        double prevtime = gettime();
        DBC *dbc;
        r = db->cursor(db, tid, &dbc, 0);                           assert(r==0);
        u_int32_t f_flags = 0;
        if (prelockflag && (counter || prelock)) {
            f_flags |= lock_flag;
        }
        long rowcounter=0;
        while (0 == (r = dbc->c_getf_next(dbc, f_flags, counttotalbytes, &e))) {
            rowcounter++;
            if (limitcount>0 && rowcounter>=limitcount) break;
        }
        r = dbc->c_close(dbc);                                      assert(r==0);
        double thistime = gettime();
        double tdiff = thistime-prevtime;
        printf("LWC Scan %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", e.totalbytes, e.rowcounter, tdiff, 1e-6*e.totalbytes/tdiff);
    }
}
#endif

static void scanscan_range (void) {
    int r;

    double texperiments[n_experiments];
    u_int64_t k = 0;
    char kv[8];
    DBT key, val;
  
    int counter;
    for (counter = 0; counter < n_experiments; counter++) {

        if (1) { //if ((counter&1) == 0) {   
        makekey:
            // generate a random key in the key range
            k = (start_range + (random() % (end_range - start_range))) * (1<<6);
            int i;
            for (i = 0; i < 8; i++)
                kv[i] = k >> (56-8*i);
        }
        memset(&key, 0, sizeof key); key.data = &kv, key.size = sizeof kv;
        memset(&val, 0, sizeof val);

        double tstart = gettime();

        DBC *dbc;
        r = db->cursor(db, tid, &dbc, 0); assert(r==0);

        // set the cursor to the random key
        r = dbc->c_get(dbc, &key, &val, DB_SET_RANGE+lock_flag);
        if (r != 0) {
            assert(r == DB_NOTFOUND);
            printf("%s:%d %" PRIu64 "\n", __FUNCTION__, __LINE__, k);
            goto makekey;
        }

#ifdef TOKUDB
        // do the range scan
        long rowcounter = 0;
        struct extra_count e = {0,0};
        while (limitcount > 0 && rowcounter < limitcount) {
            r = dbc->c_getf_next(dbc, prelockflag ? lock_flag : 0, counttotalbytes, &e);
            if (r != 0)
                break;
            rowcounter++;
        }
#endif

        r = dbc->c_close(dbc);                                      
        assert(r==0);

        texperiments[counter] = gettime() - tstart;
        printf("%" PRIu64 " %f\n", k, texperiments[counter]); fflush(stdout);
    }

    // print the times
    double tsum = 0.0, tmin = 0.0, tmax = 0.0;
    for (counter = 0; counter < n_experiments; counter++) {
        if (counter==0 || texperiments[counter] < tmin)
            tmin = texperiments[counter];
        if (counter==0 || texperiments[counter] > tmax)
            tmax = texperiments[counter];
        tsum += texperiments[counter];
    }
    printf("%f %f %f/%d = %f\n", tmin, tmax, tsum, n_experiments, tsum / n_experiments);
}

#ifdef TOKUDB

struct extra_verify {
    long long totalbytes;
    int rowcounter;
    DBT k,v; // the k and v are gotten using the old cursor
};

static int
checkbytes (DBT const *key, DBT const *data, void *extrav) {
    struct extra_verify *e=extrav;
    e->totalbytes += key->size + data->size;
    e->rowcounter++;
    assert(e->k.size == key->size);
    assert(e->v.size == data->size);
    assert(memcmp(e->k.data, key->data,  key->size)==0);
    assert(memcmp(e->v.data, data->data, data->size)==0);
    assert(e->k.data != key->data);
    assert(e->v.data != data->data);
    return 0;
}
    

static void scanscan_verify (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
        struct extra_verify v;
        v.totalbytes=0;
        v.rowcounter=0;
        double prevtime = gettime();
        DBC *dbc1, *dbc2;
        r = db->cursor(db, tid, &dbc1, 0);                           assert(r==0);
        r = db->cursor(db, tid, &dbc2, 0);                           assert(r==0);
        memset(&v.k, 0, sizeof(v.k));
        memset(&v.v, 0, sizeof(v.v));
        u_int32_t f_flags = 0;
        u_int32_t c_get_flags = DB_NEXT;
        if (prelockflag && (counter || prelock)) {
            f_flags     |= lock_flag;
            c_get_flags |= lock_flag;
        }
        while (1) {
            int r1,r2;
            r2 = dbc1->c_get(dbc1, &v.k, &v.v, c_get_flags);
            r1 = dbc2->c_getf_next(dbc2, f_flags, checkbytes, &v);
            assert(r1==r2);
            if (r1) break;
        }
        r = dbc1->c_close(dbc1);                                      assert(r==0);
        r = dbc2->c_close(dbc2);                                      assert(r==0);
        double thistime = gettime();
        double tdiff = thistime-prevtime;
        printf("verify   %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", v.totalbytes, v.rowcounter, tdiff, 1e-6*v.totalbytes/tdiff);
    }
}

#endif

int main (int argc, const char *argv[]) {

    parse_args(argc,argv);

    scanscan_setup();
    switch (run_mode) {
    case RUN_HWC:    scanscan_hwc();    break;
#ifdef TOKUDB
    case RUN_LWC:    scanscan_lwc();    break;
    case RUN_VERIFY: scanscan_verify(); break;
#endif
    case RUN_RANGE:  scanscan_range();  break;
    default:         assert(0);         break;
    }
    scanscan_shutdown();

    return 0;
}