18b67f3f0d
minimal performance improvements, and then only at SQL preparation time, not at runtime, and it has problems with data races in shared-cache mode. We might later add the keyinfo cache back but only enable it when shared-cache mode is off. FossilOrigin-Name: b7489f9451628c68f1dfc1d457fc161a0921c631
437 lines
13 KiB
C
437 lines
13 KiB
C
/*
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** 2014-12-11
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file implements a simple standalone program used to stress the
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** SQLite library when accessing the same set of databases simultaneously
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** from multiple threads in shared-cache mode.
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**
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** This test program runs on unix-like systems only. It uses pthreads.
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** To compile:
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**
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** gcc -o tt4 -I. threadtest4.c sqlite3.c -ldl -lpthread
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**
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** To run:
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**
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** ./tt4 10
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**
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** The argument is the number of threads.
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*/
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#include "sqlite3.h"
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#include <pthread.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdarg.h>
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/*
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** An instance of the following structure is passed into each worker
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** thread.
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*/
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typedef struct WorkerInfo WorkerInfo;
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struct WorkerInfo {
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int tid; /* Thread ID */
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unsigned wkrFlags; /* Flags */
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sqlite3 *mainDb; /* Database connection of the main thread */
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sqlite3 *db; /* Database connection of this thread */
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int nErr; /* Number of errors seen by this thread */
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int nTest; /* Number of tests run by this thread */
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char *zMsg; /* Message returned by this thread */
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pthread_t id; /* Thread id */
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pthread_mutex_t *pWrMutex; /* Hold this mutex while writing */
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};
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/*
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** Allowed values for WorkerInfo.wkrFlags
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*/
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#define TT4_SERIALIZED 0x0000001 /* The --serialized option is used */
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#define TT4_WAL 0x0000002 /* WAL mode in use */
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#define TT4_TRACE 0x0000004 /* Trace activity */
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/*
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** Report an OOM error and die if the argument is NULL
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*/
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static void check_oom(void *x){
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if( x==0 ){
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fprintf(stderr, "out of memory\n");
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exit(1);
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}
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}
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/*
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** Allocate memory. If the allocation fails, print an error message and
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** kill the process.
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*/
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static void *safe_malloc(int sz){
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void *x = sqlite3_malloc(sz>0?sz:1);
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check_oom(x);
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return x;
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}
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/*
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** Print a trace message for a worker
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*/
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static void worker_trace(WorkerInfo *p, const char *zFormat, ...){
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va_list ap;
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char *zMsg;
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if( (p->wkrFlags & TT4_TRACE)==0 ) return;
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va_start(ap, zFormat);
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zMsg = sqlite3_vmprintf(zFormat, ap);
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check_oom(zMsg);
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va_end(ap);
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fprintf(stderr, "TRACE(%02d): %s\n", p->tid, zMsg);
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sqlite3_free(zMsg);
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}
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/*
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** Prepare a single SQL query
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*/
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static sqlite3_stmt *prep_sql(sqlite3 *db, const char *zFormat, ...){
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va_list ap;
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char *zSql;
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int rc;
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sqlite3_stmt *pStmt = 0;
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va_start(ap, zFormat);
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zSql = sqlite3_vmprintf(zFormat, ap);
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va_end(ap);
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check_oom(zSql);
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rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
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if( rc!=SQLITE_OK ){
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fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
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rc, sqlite3_extended_errcode(db), sqlite3_errmsg(db), zSql);
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exit(1);
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}
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sqlite3_free(zSql);
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return pStmt;
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}
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/*
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** Run a SQL statements. Panic if unable.
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*/
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static void run_sql(WorkerInfo *p, const char *zFormat, ...){
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va_list ap;
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char *zSql;
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int rc;
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sqlite3_stmt *pStmt = 0;
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int nRetry = 0;
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va_start(ap, zFormat);
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zSql = sqlite3_vmprintf(zFormat, ap);
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va_end(ap);
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check_oom(zSql);
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rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
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if( rc!=SQLITE_OK ){
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fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
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rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
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exit(1);
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}
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worker_trace(p, "running [%s]", zSql);
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while( (rc = sqlite3_step(pStmt))!=SQLITE_DONE ){
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if( (rc&0xff)==SQLITE_BUSY || (rc&0xff)==SQLITE_LOCKED ){
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sqlite3_reset(pStmt);
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nRetry++;
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if( nRetry<10 ){
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worker_trace(p, "retry %d for [%s]", nRetry, zSql);
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sched_yield();
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continue;
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}else{
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fprintf(stderr, "Deadlock in thread %d while running [%s]\n",
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p->tid, zSql);
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exit(1);
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}
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}
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if( rc!=SQLITE_ROW ){
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fprintf(stderr, "SQL error (%d,%d): %s\nWhile running [%s]\n",
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rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
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exit(1);
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}
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}
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sqlite3_free(zSql);
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sqlite3_finalize(pStmt);
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}
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/*
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** Open the database connection for WorkerInfo. The order in which
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** the files are opened is a function of the tid value.
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*/
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static void worker_open_connection(WorkerInfo *p, int iCnt){
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char *zFile;
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int x;
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int rc;
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static const unsigned char aOrder[6][3] = {
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{ 1, 2, 3},
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{ 1, 3, 2},
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{ 2, 1, 3},
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{ 2, 3, 1},
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{ 3, 1, 2},
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{ 3, 2, 1}
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};
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x = (p->tid + iCnt) % 6;
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zFile = sqlite3_mprintf("tt4-test%d.db", aOrder[x][0]);
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check_oom(zFile);
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worker_trace(p, "open %s", zFile);
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rc = sqlite3_open_v2(zFile, &p->db,
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SQLITE_OPEN_READWRITE|SQLITE_OPEN_SHAREDCACHE, 0);
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if( rc!=SQLITE_OK ){
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fprintf(stderr, "sqlite_open_v2(%s) failed on thread %d\n",
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zFile, p->tid);
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exit(1);
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}
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sqlite3_free(zFile);
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run_sql(p, "PRAGMA read_uncommitted=ON;");
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sqlite3_busy_timeout(p->db, 10000);
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run_sql(p, "PRAGMA synchronous=OFF;");
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run_sql(p, "ATTACH 'tt4-test%d.db' AS aux1", aOrder[x][1]);
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run_sql(p, "ATTACH 'tt4-test%d.db' AS aux2", aOrder[x][2]);
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}
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/*
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** Close the worker database connection
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*/
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static void worker_close_connection(WorkerInfo *p){
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if( p->db ){
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worker_trace(p, "close");
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sqlite3_close(p->db);
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p->db = 0;
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}
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}
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/*
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** Delete all content in the three databases associated with a
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** single thread. Make this happen all in a single transaction if
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** inTrans is true, or separately for each database if inTrans is
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** false.
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*/
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static void worker_delete_all_content(WorkerInfo *p, int inTrans){
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if( inTrans ){
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pthread_mutex_lock(p->pWrMutex);
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run_sql(p, "BEGIN");
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run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
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run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
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run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
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run_sql(p, "COMMIT");
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pthread_mutex_unlock(p->pWrMutex);
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p->nTest++;
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}else{
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pthread_mutex_lock(p->pWrMutex);
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run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
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pthread_mutex_unlock(p->pWrMutex);
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p->nTest++;
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pthread_mutex_lock(p->pWrMutex);
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run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
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pthread_mutex_unlock(p->pWrMutex);
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p->nTest++;
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pthread_mutex_lock(p->pWrMutex);
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run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
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pthread_mutex_unlock(p->pWrMutex);
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p->nTest++;
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}
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}
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/*
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** Create rows mn through mx in table iTab for the given worker
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*/
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static void worker_add_content(WorkerInfo *p, int mn, int mx, int iTab){
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char *zTabDef;
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switch( iTab ){
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case 1: zTabDef = "t1(tid,sp,a,b,c)"; break;
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case 2: zTabDef = "t2(tid,sp,d,e,f)"; break;
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case 3: zTabDef = "t3(tid,sp,x,y,z)"; break;
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}
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pthread_mutex_lock(p->pWrMutex);
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run_sql(p,
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"WITH RECURSIVE\n"
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" c(i) AS (VALUES(%d) UNION ALL SELECT i+1 FROM c WHERE i<%d)\n"
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"INSERT INTO %s SELECT %d, zeroblob(3000), i, printf('%%d',i), i FROM c;",
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mn, mx, zTabDef, p->tid
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);
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pthread_mutex_unlock(p->pWrMutex);
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p->nTest++;
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}
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/*
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** Set an error message on a worker
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*/
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static void worker_error(WorkerInfo *p, const char *zFormat, ...){
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va_list ap;
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p->nErr++;
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sqlite3_free(p->zMsg);
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va_start(ap, zFormat);
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p->zMsg = sqlite3_vmprintf(zFormat, ap);
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va_end(ap);
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}
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/*
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** Each thread runs the following function.
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*/
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static void *worker_thread(void *pArg){
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WorkerInfo *p = (WorkerInfo*)pArg;
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int iOuter;
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int i;
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int rc;
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sqlite3_stmt *pStmt;
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printf("worker %d startup\n", p->tid); fflush(stdout);
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for(iOuter=1; iOuter<=4; iOuter++){
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worker_open_connection(p, iOuter);
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for(i=0; i<4; i++){
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worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter)%3 + 1);
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worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+1)%3 + 1);
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worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+2)%3 + 1);
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}
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pStmt = prep_sql(p->db, "SELECT count(a) FROM t1 WHERE tid=%d", p->tid);
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worker_trace(p, "query [%s]", sqlite3_sql(pStmt));
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rc = sqlite3_step(pStmt);
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if( rc!=SQLITE_ROW ){
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worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt));
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}else if( sqlite3_column_int(pStmt, 0)!=400 ){
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worker_error(p, "Wrong result: %d", sqlite3_column_int(pStmt,0));
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}
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if( p->nErr ) break;
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sqlite3_finalize(pStmt);
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worker_delete_all_content(p, (p->tid+iOuter)%2);
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worker_close_connection(p);
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p->db = 0;
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}
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worker_close_connection(p);
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printf("worker %d finished\n", p->tid); fflush(stdout);
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return 0;
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}
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int main(int argc, char **argv){
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int nWorker = 0; /* Number of worker threads */
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int i; /* Loop counter */
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WorkerInfo *aInfo; /* Information for each worker */
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unsigned wkrFlags = 0; /* Default worker flags */
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int nErr = 0; /* Number of errors */
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int nTest = 0; /* Number of tests */
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int rc; /* Return code */
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sqlite3 *db = 0; /* Main database connection */
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pthread_mutex_t wrMutex; /* The write serialization mutex */
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WorkerInfo infoTop; /* WorkerInfo for the main thread */
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WorkerInfo *p; /* Pointer to infoTop */
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sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
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for(i=1; i<argc; i++){
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const char *z = argv[i];
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if( z[0]=='-' ){
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if( z[1]=='-' && z[2]!=0 ) z++;
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if( strcmp(z,"-multithread")==0 ){
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sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
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wkrFlags &= ~TT4_SERIALIZED;
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}else if( strcmp(z,"-serialized")==0 ){
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sqlite3_config(SQLITE_CONFIG_SERIALIZED);
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wkrFlags |= TT4_SERIALIZED;
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}else if( strcmp(z,"-wal")==0 ){
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wkrFlags |= TT4_WAL;
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}else if( strcmp(z,"-trace")==0 ){
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wkrFlags |= TT4_TRACE;
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}else{
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fprintf(stderr, "unknown command-line option: %s\n", argv[i]);
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exit(1);
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}
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}else if( z[0]>='1' && z[0]<='9' && nWorker==0 ){
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nWorker = atoi(z);
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if( nWorker<2 ){
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fprintf(stderr, "minimum of 2 threads\n");
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exit(1);
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}
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}else{
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fprintf(stderr, "extra command-line argument: \"%s\"\n", argv[i]);
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exit(1);
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}
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}
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if( nWorker==0 ){
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fprintf(stderr,
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"usage: %s ?OPTIONS? N\n"
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"N is the number of threads and must be at least 2.\n"
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"Options:\n"
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" --serialized\n"
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" --multithread\n"
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,argv[0]
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);
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exit(1);
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}
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if( !sqlite3_threadsafe() ){
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fprintf(stderr, "requires a threadsafe build of SQLite\n");
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exit(1);
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}
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sqlite3_initialize();
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sqlite3_enable_shared_cache(1);
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pthread_mutex_init(&wrMutex, 0);
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/* Initialize the test database files */
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(void)unlink("tt4-test1.db");
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(void)unlink("tt4-test2.db");
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(void)unlink("tt4-test3.db");
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rc = sqlite3_open("tt4-test1.db", &db);
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if( rc!=SQLITE_OK ){
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fprintf(stderr, "Unable to open test database: tt4-test2.db\n");
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exit(1);
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}
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memset(&infoTop, 0, sizeof(infoTop));
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infoTop.db = db;
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infoTop.wkrFlags = wkrFlags;
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p = &infoTop;
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if( wkrFlags & TT4_WAL ){
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run_sql(p, "PRAGMA journal_mode=WAL");
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}
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run_sql(p, "PRAGMA synchronous=OFF");
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run_sql(p, "CREATE TABLE IF NOT EXISTS t1(tid INTEGER, sp, a, b, c)");
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run_sql(p, "CREATE INDEX t1tid ON t1(tid)");
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run_sql(p, "CREATE INDEX t1ab ON t1(a,b)");
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run_sql(p, "ATTACH 'tt4-test2.db' AS 'test2'");
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run_sql(p, "CREATE TABLE IF NOT EXISTS test2.t2(tid INTEGER, sp, d, e, f)");
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run_sql(p, "CREATE INDEX test2.t2tid ON t2(tid)");
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run_sql(p, "CREATE INDEX test2.t2de ON t2(d,e)");
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run_sql(p, "ATTACH 'tt4-test3.db' AS 'test3'");
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run_sql(p, "CREATE TABLE IF NOT EXISTS test3.t3(tid INTEGER, sp, x, y, z)");
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run_sql(p, "CREATE INDEX test3.t3tid ON t3(tid)");
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run_sql(p, "CREATE INDEX test3.t3xy ON t3(x,y)");
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aInfo = safe_malloc( sizeof(*aInfo)*nWorker );
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memset(aInfo, 0, sizeof(*aInfo)*nWorker);
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for(i=0; i<nWorker; i++){
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aInfo[i].tid = i+1;
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aInfo[i].wkrFlags = wkrFlags;
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aInfo[i].mainDb = db;
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aInfo[i].pWrMutex = &wrMutex;
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rc = pthread_create(&aInfo[i].id, 0, worker_thread, &aInfo[i]);
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if( rc!=0 ){
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fprintf(stderr, "thread creation failed for thread %d\n", i+1);
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exit(1);
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}
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sched_yield();
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}
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for(i=0; i<nWorker; i++){
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pthread_join(aInfo[i].id, 0);
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printf("Joined thread %d: %d errors in %d tests",
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aInfo[i].tid, aInfo[i].nErr, aInfo[i].nTest);
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if( aInfo[i].zMsg ){
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printf(": %s\n", aInfo[i].zMsg);
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}else{
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printf("\n");
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}
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nErr += aInfo[i].nErr;
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nTest += aInfo[i].nTest;
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fflush(stdout);
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}
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sqlite3_close(db);
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sqlite3_free(aInfo);
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printf("Total %d errors in %d tests\n", nErr, nTest);
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return nErr;
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}
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