pgbench: improve multi-script support

Previously, it was possible to specify one or several custom scripts to
run, or only one of the builtin scripts.  With this patch it is also
possible to specify to run the builtin scripts multiple times, using the
new -b option.  Also, unify the code for both cases; this eases future
pgbench improvements.

Author: Fabien Coelho
Review: Michaël Paquier, Álvaro Herrera

doc/src/sgml/ref/pgbench.sgml

@@ -48,7 +48,7 @@
   Typical output from <application>pgbench</application> looks like:
 
 <screen>
-transaction type: TPC-B (sort of)
+transaction type: &lt;builtin: TPC-B (sort of)&gt;
 scaling factor: 10
 query mode: simple
 number of clients: 10
@@ -261,6 +261,20 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
     benchmarking arguments:
 
     <variablelist>
+     <varlistentry>
+      <term><option>-b</> <replaceable>scriptname</></term>
+      <term><option>--builtin</> <replaceable>scriptname</></term>
+      <listitem>
+       <para>
+        Add the specified builtin script to the list of executed scripts.
+        Available builtin scripts are: <literal>tpcb-like</>,
+        <literal>simple-update</> and <literal>select-only</>.
+        With special name <literal>list</>, show the list of builtin scripts
+        and exit immediately.
+       </para>
+      </listitem>
+     </varlistentry>
+
 
      <varlistentry>
       <term><option>-c</option> <replaceable>clients</></term>
@@ -307,14 +321,13 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
      </varlistentry>
 
      <varlistentry>
-      <term><option>-f</option> <replaceable>filename</></term>
-      <term><option>--file=</option><replaceable>filename</></term>
+      <term><option>-f</> <replaceable>filename</></term>
+      <term><option>--file=</><replaceable>filename</></term>
       <listitem>
        <para>
-        Read transaction script from <replaceable>filename</>.
+        Add a transaction script read from <replaceable>filename</> to
+        the list of executed scripts.
         See below for details.
-        <option>-N</option>, <option>-S</option>, and <option>-f</option>
-        are mutually exclusive.
        </para>
       </listitem>
      </varlistentry>
@@ -404,10 +417,8 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
       <term><option>--skip-some-updates</option></term>
       <listitem>
        <para>
-        Do not update <structname>pgbench_tellers</> and
-        <structname>pgbench_branches</>.
-        This will avoid update contention on these tables, but
-        it makes the test case even less like TPC-B.
+        Run builtin simple-update script.
+        Shorthand for <option>-b simple-update</>.
        </para>
       </listitem>
      </varlistentry>
@@ -512,9 +523,9 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
         Report the specified scale factor in <application>pgbench</>'s
         output.  With the built-in tests, this is not necessary; the
         correct scale factor will be detected by counting the number of
-        rows in the <structname>pgbench_branches</> table.  However, when testing
-        custom benchmarks (<option>-f</> option), the scale factor
-        will be reported as 1 unless this option is used.
+        rows in the <structname>pgbench_branches</> table.
+        However, when testing only custom benchmarks (<option>-f</> option),
+        the scale factor will be reported as 1 unless this option is used.
        </para>
       </listitem>
      </varlistentry>
@@ -524,7 +535,8 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
       <term><option>--select-only</option></term>
       <listitem>
        <para>
-        Perform select-only transactions instead of TPC-B-like test.
+        Run built-in select-only script.
+        Shorthand for <option>-b select-only</>.
        </para>
       </listitem>
      </varlistentry>
@@ -674,7 +686,17 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
   <title>What is the <quote>Transaction</> Actually Performed in <application>pgbench</application>?</title>
 
   <para>
-   The default transaction script issues seven commands per transaction:
+   Pgbench executes test scripts chosen randomly from a specified list.
+   They include built-in scripts with <option>-b</> and
+   user-provided custom scripts with <option>-f</>.
+ </para>
+
+  <para>
+   The default builtin transaction script (also invoked with <option>-b tpcb-like</>)
+   issues seven commands per transaction over randomly chosen <literal>aid</>,
+   <literal>tid</>, <literal>bid</> and <literal>balance</>.
+   The scenario is inspired by the TPC-B benchmark, but is not actually TPC-B,
+   hence the name.
   </para>
 
   <orderedlist>
@@ -688,9 +710,15 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
   </orderedlist>
 
   <para>
-   If you specify <option>-N</>, steps 4 and 5 aren't included in the
-   transaction.  If you specify <option>-S</>, only the <command>SELECT</> is
-   issued.
+   If you select the <literal>simple-update</> builtin (also <option>-N</>),
+   steps 4 and 5 aren't included in the transaction.
+   This will avoid update contention on these tables, but
+   it makes the test case even less like TPC-B.
+  </para>
+
+  <para>
+   If you select the <literal>select-only</> builtin (also <option>-S</>),
+   only the <command>SELECT</> is issued.
   </para>
  </refsect2>
 
@@ -702,10 +730,7 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
    benchmark scenarios by replacing the default transaction script
    (described above) with a transaction script read from a file
    (<option>-f</option> option).  In this case a <quote>transaction</>
-   counts as one execution of a script file.  You can even specify
-   multiple scripts (multiple <option>-f</option> options), in which
-   case a random one of the scripts is chosen each time a client session
-   starts a new transaction.
+   counts as one execution of a script file.
   </para>
 
   <para>
@@ -1103,7 +1128,7 @@ END;
    For the default script, the output will look similar to this:
 <screen>
 starting vacuum...end.
-transaction type: TPC-B (sort of)
+transaction type: &lt;builtin: TPC-B (sort of)&gt;
 scaling factor: 1
 query mode: simple
 number of clients: 10
@@ -1112,7 +1137,8 @@ number of transactions per client: 1000
 number of transactions actually processed: 10000/10000
 tps = 618.764555 (including connections establishing)
 tps = 622.977698 (excluding connections establishing)
-statement latencies in milliseconds:
+SQL script 1: &lt;builtin: TPC-B (sort of)&gt;
+ - statement latencies in milliseconds:
         0.004386        \set nbranches 1 * :scale
         0.001343        \set ntellers 10 * :scale
         0.001212        \set naccounts 100000 * :scale

src/bin/pgbench/pgbench.c

@@ -189,13 +189,12 @@ typedef struct
 	char	   *value;			/* its value */
 } Variable;
 
-#define MAX_FILES		128		/* max number of SQL script files allowed */
+#define MAX_SCRIPTS		128		/* max number of SQL scripts allowed */
 #define SHELL_COMMAND_SIZE	256 /* maximum size allowed for shell command */
 
 /*
- * structures used in custom query mode
+ * Connection state
  */
-
 typedef struct
 {
 	PGconn	   *con;			/* connection handle to DB */
@@ -210,8 +209,8 @@ typedef struct
 	int64		txn_scheduled;	/* scheduled start time of transaction (usec) */
 	instr_time	txn_begin;		/* used for measuring schedule lag times */
 	instr_time	stmt_begin;		/* used for measuring statement latencies */
-	int			use_file;		/* index in sql_files for this client */
-	bool		prepared[MAX_FILES];
+	int			use_file;		/* index in sql_scripts for this client */
+	bool		prepared[MAX_SCRIPTS];	/* whether client prepared the script */
 
 	/* per client collected stats */
 	int			cnt;			/* xacts count */
@@ -295,13 +294,29 @@ typedef struct
 	double		sum2_lag;		/* sum(lag*lag) */
 } AggVals;
 
-static Command **sql_files[MAX_FILES];	/* SQL script files */
-static int	num_files;			/* number of script files */
+static struct
+{
+	const char *name;
+	Command	 **commands;
+} sql_script[MAX_SCRIPTS];		/* SQL script files */
+static int	num_scripts;		/* number of scripts in sql_script[] */
 static int	num_commands = 0;	/* total number of Command structs */
 static int	debug = 0;			/* debug flag */
 
-/* default scenario */
-static char *tpc_b = {
+/* Define builtin test scripts */
+#define N_BUILTIN 3
+static struct
+{
+	char	   *name;			/* very short name for -b ... */
+	char	   *desc;			/* short description */
+	char	   *commands;		/* actual pgbench script */
+}
+
+			builtin_script[] =
+{
+	{
+		"tpcb-like",
+		"<builtin: TPC-B (sort of)>",
 		"\\set nbranches " CppAsString2(nbranches) " * :scale\n"
 		"\\set ntellers " CppAsString2(ntellers) " * :scale\n"
 		"\\set naccounts " CppAsString2(naccounts) " * :scale\n"
@@ -316,10 +331,10 @@ static char *tpc_b = {
 		"UPDATE pgbench_branches SET bbalance = bbalance + :delta WHERE bid = :bid;\n"
 		"INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP);\n"
 		"END;\n"
-};
-
-/* -N case */
-static char *simple_update = {
+	},
+	{
+		"simple-update",
+		"<builtin: simple update>",
 		"\\set nbranches " CppAsString2(nbranches) " * :scale\n"
 		"\\set ntellers " CppAsString2(ntellers) " * :scale\n"
 		"\\set naccounts " CppAsString2(naccounts) " * :scale\n"
@@ -332,15 +347,17 @@ static char *simple_update = {
 		"SELECT abalance FROM pgbench_accounts WHERE aid = :aid;\n"
 		"INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP);\n"
 		"END;\n"
-};
-
-/* -S case */
-static char *select_only = {
+	},
+	{
+		"select-only",
+		"<builtin: select only>",
 		"\\set naccounts " CppAsString2(naccounts) " * :scale\n"
 		"\\setrandom aid 1 :naccounts\n"
 		"SELECT abalance FROM pgbench_accounts WHERE aid = :aid;\n"
+	}
 };
 
+
 /* Function prototypes */
 static void setalarm(int seconds);
 static void *threadRun(void *arg);
@@ -365,24 +382,29 @@ usage(void)
 	"                           create indexes in the specified tablespace\n"
 	 "  --tablespace=TABLESPACE  create tables in the specified tablespace\n"
 		   "  --unlogged-tables        create tables as unlogged tables\n"
+		   "\nOptions to select what to run:\n"
+		   "  -b, --builtin=NAME       add buitin script (use \"-b list\" to display\n"
+		   "                           available scripts)\n"
+		   "  -f, --file=FILENAME      add transaction script from FILENAME\n"
+		   "  -N, --skip-some-updates  skip updates of pgbench_tellers and pgbench_branches\n"
+		   "                           (same as \"-b simple-update\")\n"
+		   "  -S, --select-only        perform SELECT-only transactions\n"
+		   "                           (same as \"-b select-only\")\n"
 		   "\nBenchmarking options:\n"
 		   "  -c, --client=NUM         number of concurrent database clients (default: 1)\n"
 		   "  -C, --connect            establish new connection for each transaction\n"
 		   "  -D, --define=VARNAME=VALUE\n"
 	  "                           define variable for use by custom script\n"
-		 "  -f, --file=FILENAME      read transaction script from FILENAME\n"
 		   "  -j, --jobs=NUM           number of threads (default: 1)\n"
 		   "  -l, --log                write transaction times to log file\n"
 		   "  -L, --latency-limit=NUM  count transactions lasting more than NUM ms as late\n"
 		   "  -M, --protocol=simple|extended|prepared\n"
 		   "                           protocol for submitting queries (default: simple)\n"
 		   "  -n, --no-vacuum          do not run VACUUM before tests\n"
-		   "  -N, --skip-some-updates  skip updates of pgbench_tellers and pgbench_branches\n"
 		   "  -P, --progress=NUM       show thread progress report every NUM seconds\n"
 		   "  -r, --report-latencies   report average latency per command\n"
 		"  -R, --rate=NUM           target rate in transactions per second\n"
 		   "  -s, --scale=NUM          report this scale factor in output\n"
-		   "  -S, --select-only        perform SELECT-only transactions\n"
 		   "  -t, --transactions=NUM   number of transactions each client runs (default: 10)\n"
 		 "  -T, --time=NUM           duration of benchmark test in seconds\n"
 		   "  -v, --vacuum-all         vacuum all four standard tables before tests\n"
@@ -1123,6 +1145,15 @@ agg_vals_init(AggVals *aggs, instr_time start)
 	aggs->start_time = INSTR_TIME_GET_DOUBLE(start);
 }
 
+static int
+chooseScript(TState *thread)
+{
+	if (num_scripts == 1)
+		return 0;
+
+	return getrand(thread, 0, num_scripts - 1);
+}
+
 /* return false iff client should be disconnected */
 static bool
 doCustom(TState *thread, CState *st, instr_time *conn_time, FILE *logfile, AggVals *agg)
@@ -1143,7 +1174,7 @@ doCustom(TState *thread, CState *st, instr_time *conn_time, FILE *logfile, AggVa
 top:
 	INSTR_TIME_SET_ZERO(now);
 
-	commands = sql_files[st->use_file];
+	commands = sql_script[st->use_file].commands;
 
 	/*
 	 * Handle throttling once per transaction by sleeping.  It is simpler to
@@ -1328,8 +1359,11 @@ top:
 		if (commands[st->state] == NULL)
 		{
 			st->state = 0;
-			st->use_file = (int) getrand(thread, 0, num_files - 1);
-			commands = sql_files[st->use_file];
+			st->use_file = chooseScript(thread);
+			commands = sql_script[st->use_file].commands;
+			if (debug)
+				fprintf(stderr, "client %d executing script \"%s\"\n", st->id,
+						sql_script[st->use_file].name);
 			st->is_throttled = false;
 
 			/*
@@ -2239,7 +2273,6 @@ static Command *
 process_commands(char *buf, const char *source, const int lineno)
 {
 	const char	delim[] = " \f\n\r\t\v";
-
 	Command    *my_commands;
 	int			j;
 	char	   *p,
@@ -2489,7 +2522,11 @@ read_line_from_file(FILE *fd)
 	return NULL;
 }
 
-static int
+/*
+ * Given a file name, read it and return the array of Commands contained
+ * therein.  "-" means to read stdin.
+ */
+static Command **
 process_file(char *filename)
 {
 #define COMMANDS_ALLOC_NUM 128
@@ -2501,12 +2538,6 @@ process_file(char *filename)
 	char	   *buf;
 	int			alloc_num;
 
-	if (num_files >= MAX_FILES)
-	{
-		fprintf(stderr, "at most %d SQL files are allowed\n", MAX_FILES);
-		exit(1);
-	}
-
 	alloc_num = COMMANDS_ALLOC_NUM;
 	my_commands = (Command **) pg_malloc(sizeof(Command *) * alloc_num);
 
@@ -2517,7 +2548,7 @@ process_file(char *filename)
 		fprintf(stderr, "could not open file \"%s\": %s\n",
 				filename, strerror(errno));
 		pg_free(my_commands);
-		return false;
+		return NULL;
 	}
 
 	lineno = 0;
@@ -2549,13 +2580,11 @@ process_file(char *filename)
 
 	my_commands[index] = NULL;
 
-	sql_files[num_files++] = my_commands;
-
-	return true;
+	return my_commands;
 }
 
 static Command **
-process_builtin(char *tb, const char *source)
+process_builtin(const char *tb, const char *source)
 {
 #define COMMANDS_ALLOC_NUM 128
 
@@ -2609,9 +2638,60 @@ process_builtin(char *tb, const char *source)
 	return my_commands;
 }
 
+static void
+listAvailableScripts(void)
+{
+	int		i;
+
+	fprintf(stderr, "Available builtin scripts:\n");
+	for (i = 0; i < N_BUILTIN; i++)
+		fprintf(stderr, "\t%s\n", builtin_script[i].name);
+	fprintf(stderr, "\n");
+}
+
+static char *
+findBuiltin(const char *name, char **desc)
+{
+	int			i;
+
+	for (i = 0; i < N_BUILTIN; i++)
+	{
+		if (strncmp(builtin_script[i].name, name,
+					strlen(builtin_script[i].name)) == 0)
+		{
+			*desc = builtin_script[i].desc;
+			return builtin_script[i].commands;
+		}
+	}
+
+	fprintf(stderr, "no builtin script found for name \"%s\"\n", name);
+	listAvailableScripts();
+	exit(1);
+}
+
+static void
+addScript(const char *name, Command **commands)
+{
+	if (commands == NULL)
+	{
+		fprintf(stderr, "empty command list for script \"%s\"\n", name);
+		exit(1);
+	}
+
+	if (num_scripts >= MAX_SCRIPTS)
+	{
+		fprintf(stderr, "at most %d SQL scripts are allowed\n", MAX_SCRIPTS);
+		exit(1);
+	}
+
+	sql_script[num_scripts].name = name;
+	sql_script[num_scripts].commands = commands;
+	num_scripts++;
+}
+
 /* print out results */
 static void
-printResults(int ttype, int64 normal_xacts, int nclients,
+printResults(int64 normal_xacts, int nclients,
 			 TState *threads, int nthreads,
 			 instr_time total_time, instr_time conn_total_time,
 			 int64 total_latencies, int64 total_sqlats,
@@ -2621,23 +2701,14 @@ printResults(int ttype, int64 normal_xacts, int nclients,
 	double		time_include,
 				tps_include,
 				tps_exclude;
-	char	   *s;
 
 	time_include = INSTR_TIME_GET_DOUBLE(total_time);
 	tps_include = normal_xacts / time_include;
 	tps_exclude = normal_xacts / (time_include -
 						(INSTR_TIME_GET_DOUBLE(conn_total_time) / nclients));
 
-	if (ttype == 0)
-		s = "TPC-B (sort of)";
-	else if (ttype == 2)
-		s = "Update only pgbench_accounts";
-	else if (ttype == 1)
-		s = "SELECT only";
-	else
-		s = "Custom query";
-
-	printf("transaction type: %s\n", s);
+	printf("transaction type: %s\n",
+		   num_scripts == 1 ? sql_script[0].name : "multiple scripts");
 	printf("scaling factor: %d\n", scale);
 	printf("query mode: %s\n", QUERYMODE[querymode]);
 	printf("number of clients: %d\n", nclients);
@@ -2706,16 +2777,14 @@ printResults(int ttype, int64 normal_xacts, int nclients,
 	{
 		int			i;
 
-		for (i = 0; i < num_files; i++)
+		for (i = 0; i < num_scripts; i++)
 		{
 			Command   **commands;
 
-			if (num_files > 1)
-				printf("statement latencies in milliseconds, file %d:\n", i + 1);
-			else
-				printf("statement latencies in milliseconds:\n");
+			printf("SQL script %d: %s\n", i + 1, sql_script[i].name);
+			printf(" - statement latencies in milliseconds:\n");
 
-			for (commands = sql_files[i]; *commands != NULL; commands++)
+			for (commands = sql_script[i].commands; *commands != NULL; commands++)
 			{
 				Command    *command = *commands;
 				int			cnum = command->command_num;
@@ -2753,6 +2822,7 @@ main(int argc, char **argv)
 {
 	static struct option long_options[] = {
 		/* systematic long/short named options */
+		{"tpc-b", no_argument, NULL, 'b'},
 		{"client", required_argument, NULL, 'c'},
 		{"connect", no_argument, NULL, 'C'},
 		{"debug", no_argument, NULL, 'd'},
@@ -2795,14 +2865,12 @@ main(int argc, char **argv)
 	int			is_init_mode = 0;		/* initialize mode? */
 	int			is_no_vacuum = 0;		/* no vacuum at all before testing? */
 	int			do_vacuum_accounts = 0; /* do vacuum accounts before testing? */
-	int			ttype = 0;		/* transaction type. 0: TPC-B, 1: SELECT only,
-								 * 2: skip update of branches and tellers */
 	int			optindex;
-	char	   *filename = NULL;
 	bool		scale_given = false;
 
 	bool		benchmarking_option_set = false;
 	bool		initialization_option_set = false;
+	bool		internal_script_used = false;
 
 	CState	   *state;			/* status of clients */
 	TState	   *threads;		/* array of thread */
@@ -2817,6 +2885,7 @@ main(int argc, char **argv)
 	int64		throttle_lag_max = 0;
 	int64		throttle_latency_skipped = 0;
 	int64		latency_late = 0;
+	char	   *desc;
 
 	int			i;
 	int			nclients_dealt;
@@ -2862,7 +2931,7 @@ main(int argc, char **argv)
 	state = (CState *) pg_malloc(sizeof(CState));
 	memset(state, 0, sizeof(CState));
 
-	while ((c = getopt_long(argc, argv, "ih:nvp:dqSNc:j:Crs:t:T:U:lf:D:F:M:P:R:L:", long_options, &optindex)) != -1)
+	while ((c = getopt_long(argc, argv, "ih:nvp:dqb:SNc:j:Crs:t:T:U:lf:D:F:M:P:R:L:", long_options, &optindex)) != -1)
 	{
 		switch (c)
 		{
@@ -2884,14 +2953,6 @@ main(int argc, char **argv)
 			case 'd':
 				debug++;
 				break;
-			case 'S':
-				ttype = 1;
-				benchmarking_option_set = true;
-				break;
-			case 'N':
-				ttype = 2;
-				benchmarking_option_set = true;
-				break;
 			case 'c':
 				benchmarking_option_set = true;
 				nclients = atoi(optarg);
@@ -2994,12 +3055,36 @@ main(int argc, char **argv)
 				initialization_option_set = true;
 				use_quiet = true;
 				break;
+
+			case 'b':
+				if (strcmp(optarg, "list") == 0)
+				{
+					listAvailableScripts();
+					exit(0);
+				}
+
+				addScript(desc,
+						  process_builtin(findBuiltin(optarg, &desc), desc));
+				benchmarking_option_set = true;
+				internal_script_used = true;
+				break;
+			case 'S':
+				addScript(desc,
+						  process_builtin(findBuiltin("select-only", &desc),
+										 desc));
+				benchmarking_option_set = true;
+				internal_script_used = true;
+				break;
+			case 'N':
+				addScript(desc,
+						  process_builtin(findBuiltin("simple-update", &desc),
+										 desc));
+				benchmarking_option_set = true;
+				internal_script_used = true;
+				break;
 			case 'f':
+				addScript(optarg, process_file(optarg));
 				benchmarking_option_set = true;
-				ttype = 3;
-				filename = pg_strdup(optarg);
-				if (process_file(filename) == false || *sql_files[num_files - 1] == NULL)
-					exit(1);
 				break;
 			case 'D':
 				{
@@ -3030,9 +3115,9 @@ main(int argc, char **argv)
 				break;
 			case 'M':
 				benchmarking_option_set = true;
-				if (num_files > 0)
+				if (num_scripts > 0)
 				{
-					fprintf(stderr, "query mode (-M) should be specified before any transaction scripts (-f)\n");
+					fprintf(stderr, "query mode (-M) should be specified before any transaction scripts (-f or -b)\n");
 					exit(1);
 				}
 				for (querymode = 0; querymode < NUM_QUERYMODE; querymode++)
@@ -3133,6 +3218,15 @@ main(int argc, char **argv)
 		}
 	}
 
+	/* set default script if none */
+	if (num_scripts == 0 && !is_init_mode)
+	{
+		addScript(desc,
+				  process_builtin(findBuiltin("tpcb-like", &desc), desc));
+		benchmarking_option_set = true;
+		internal_script_used = true;
+	}
+
 	/*
 	 * Don't need more threads than there are clients.  (This is not merely an
 	 * optimization; throttle_delay is calculated incorrectly below if some
@@ -3261,7 +3355,7 @@ main(int argc, char **argv)
 		exit(1);
 	}
 
-	if (ttype != 3)
+	if (internal_script_used)
 	{
 		/*
 		 * get the scaling factor that should be same as count(*) from
@@ -3345,31 +3439,6 @@ main(int argc, char **argv)
 	INSTR_TIME_SET_CURRENT(start_time);
 	srandom((unsigned int) INSTR_TIME_GET_MICROSEC(start_time));
 
-	/* process builtin SQL scripts */
-	switch (ttype)
-	{
-		case 0:
-			sql_files[0] = process_builtin(tpc_b,
-										   "<builtin: TPC-B (sort of)>");
-			num_files = 1;
-			break;
-
-		case 1:
-			sql_files[0] = process_builtin(select_only,
-										   "<builtin: select only>");
-			num_files = 1;
-			break;
-
-		case 2:
-			sql_files[0] = process_builtin(simple_update,
-										   "<builtin: simple update>");
-			num_files = 1;
-			break;
-
-		default:
-			break;
-	}
-
 	/* set up thread data structures */
 	threads = (TState *) pg_malloc(sizeof(TState) * nthreads);
 	nclients_dealt = 0;
@@ -3500,7 +3569,7 @@ main(int argc, char **argv)
 	 */
 	INSTR_TIME_SET_CURRENT(total_time);
 	INSTR_TIME_SUBTRACT(total_time, start_time);
-	printResults(ttype, total_xacts, nclients, threads, nthreads,
+	printResults(total_xacts, nclients, threads, nthreads,
 				 total_time, conn_total_time, total_latencies, total_sqlats,
 				 throttle_lag, throttle_lag_max, throttle_latency_skipped,
 				 latency_late);
@@ -3584,10 +3653,14 @@ threadRun(void *arg)
 	for (i = 0; i < nstate; i++)
 	{
 		CState	   *st = &state[i];
-		Command   **commands = sql_files[st->use_file];
 		int			prev_ecnt = st->ecnt;
+		Command   **commands;
 
-		st->use_file = getrand(thread, 0, num_files - 1);
+		st->use_file = chooseScript(thread);
+		commands = sql_script[st->use_file].commands;
+		if (debug)
+			fprintf(stderr, "client %d executing script \"%s\"\n", st->id,
+					sql_script[st->use_file].name);
 		if (!doCustom(thread, st, &thread->conn_time, logfile, &aggs))
 			remains--;			/* I've aborted */
 
@@ -3615,7 +3688,7 @@ threadRun(void *arg)
 		for (i = 0; i < nstate; i++)
 		{
 			CState	   *st = &state[i];
-			Command   **commands = sql_files[st->use_file];
+			Command   **commands = sql_script[st->use_file].commands;
 			int			sock;
 
 			if (st->con == NULL)
@@ -3721,7 +3794,7 @@ threadRun(void *arg)
 		for (i = 0; i < nstate; i++)
 		{
 			CState	   *st = &state[i];
-			Command   **commands = sql_files[st->use_file];
+			Command   **commands = sql_script[st->use_file].commands;
 			int			prev_ecnt = st->ecnt;
 
 			if (st->con && (FD_ISSET(PQsocket(st->con), &input_mask)