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/*-
* Copyright (c) 2008-2012 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "thread.h"
static void print_stats(int);
static void *reader(void *);
static void *writer(void *);
typedef struct {
int remove; /* cursor.remove */
int update; /* cursor.update */
int reads; /* cursor.search */
} STATS;
static STATS *run_stats;
/*
* r --
* Return a 32-bit pseudo-random number.
*
* This is an implementation of George Marsaglia's multiply-with-carry pseudo-
* random number generator. Computationally fast, with reasonable randomness
* properties.
*/
static inline uint32_t
r(void)
{
static uint32_t m_w = 0, m_z = 0;
if (m_w == 0) {
struct timeval t;
(void)gettimeofday(&t, NULL);
m_w = (uint32_t)t.tv_sec;
m_z = (uint32_t)t.tv_usec;
}
m_z = 36969 * (m_z & 65535) + (m_z >> 16);
m_w = 18000 * (m_w & 65535) + (m_w >> 16);
return (m_z << 16) + (m_w & 65535);
}
int
run(int readers, int writers)
{
clock_t start, stop;
double seconds;
pthread_t *tids;
int i, ret;
void *thread_ret;
/* Create statistics and thread structures. */
if ((run_stats = calloc(
(size_t)(readers + writers), sizeof(*run_stats))) == NULL ||
(tids = calloc((size_t)(readers + writers), sizeof(*tids))) == NULL)
die("calloc", errno);
start = clock();
/* Create threads. */
for (i = 0; i < readers; ++i)
if ((ret = pthread_create(
&tids[i], NULL, reader, (void *)(uintptr_t)i)) != 0)
die("pthread_create", ret);
for (; i < readers + writers; ++i) {
if ((ret = pthread_create(
&tids[i], NULL, writer, (void *)(uintptr_t)i)) != 0)
die("pthread_create", ret);
}
/* Wait for the threads. */
for (i = 0; i < readers + writers; ++i)
(void)pthread_join(tids[i], &thread_ret);
stop = clock();
seconds = (stop - start) / (double)CLOCKS_PER_SEC;
fprintf(stderr, "timer: %.2lf seconds (%d ops/second)\n",
seconds, (int)(((readers + writers) * nops) / seconds));
print_stats(readers + writers);
free(run_stats);
free(tids);
return (0);
}
/*
* reader --
* Reader thread start function.
*/
static void *
reader(void *arg)
{
STATS *s;
WT_CURSOR *cursor;
WT_ITEM *key, _key;
WT_SESSION *session;
pthread_t tid;
u_int i, keyno;
int id, ret;
char keybuf[64];
id = (int)(uintptr_t)arg;
tid = pthread_self();
printf(" read thread %2d starting: tid: %p\n", id, (void *)tid);
sched_yield(); /* Get all the threads created. */
key = &_key;
s = &run_stats[id];
if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0)
die("conn.open_session", ret);
if ((ret =
session->open_cursor(session, FNAME, NULL, NULL, &cursor)) != 0)
die("session.open_cursor", ret);
for (i = 0; i < nops; ++i, ++s->reads, sched_yield()) {
keyno = r() % nkeys;
if (ftype == ROW) {
key->data = keybuf;
key->size = (uint32_t)
snprintf(keybuf, sizeof(keybuf), "%017u", keyno);
cursor->set_key(cursor, key);
} else
cursor->set_key(cursor, (uint32_t)keyno);
if ((ret = cursor->search(cursor)) != 0 && ret != WT_NOTFOUND)
die("cursor.search", ret);
}
if ((ret = session->close(session, NULL)) != 0)
die("session.close", ret);
return (NULL);
}
/*
* writer --
* Writer thread start function.
*/
static void *
writer(void *arg)
{
STATS *s;
WT_CURSOR *cursor;
WT_ITEM *key, _key, *value, _value;
WT_SESSION *session;
pthread_t tid;
u_int i, keyno;
int id, ret;
char keybuf[64], valuebuf[64];
id = (int)(uintptr_t)arg;
tid = pthread_self();
printf("write thread %2d starting: tid: %p\n", id, (void *)tid);
sched_yield(); /* Get all the threads created. */
key = &_key;
value = &_value;
s = &run_stats[id];
if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0)
die("conn.open_session", ret);
if ((ret =
session->open_cursor(session, FNAME, NULL, NULL, &cursor)) != 0)
die("session.open_cursor", ret);
for (i = 0; i < nops; ++i, sched_yield()) {
keyno = r() % nkeys;
if (ftype == ROW) {
key->data = keybuf;
key->size = (uint32_t)
snprintf(keybuf, sizeof(keybuf), "%017u", keyno);
cursor->set_key(cursor, key);
} else
cursor->set_key(cursor, (uint32_t)keyno);
if (keyno % 5 == 0) {
++s->remove;
if ((ret =
cursor->remove(cursor)) != 0 && ret != WT_NOTFOUND)
die("cursor.remove", ret);
} else {
++s->update;
value->data = valuebuf;
if (ftype == FIX)
cursor->set_value(cursor, 0x10);
else {
value->size = (uint32_t)
snprintf(valuebuf,
sizeof(valuebuf), "XXX %37u", keyno);
cursor->set_value(cursor, value);
}
if ((ret = cursor->update(cursor)) != 0)
die("cursor.update", ret);
}
}
if ((ret = session->close(session, NULL)) != 0)
die("session.close", ret);
return (NULL);
}
/*
* print_stats --
* Display reader/writer thread stats.
*/
static void
print_stats(int nthreads)
{
STATS *s;
int id;
s = run_stats;
for (id = 0; id < nthreads; ++id, ++s)
printf("%2d: read: %6d, remove: %6d, update: %6d\n",
id, s->reads, s->remove, s->update);
}
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