pgbench: When -T is used, don't wait for transactions beyond end of run.

At low rates, this can lead to pgbench taking significantly longer to
terminate than the user might expect.  Repair.

Fabien Coelho, reviewed by Aleksander Alekseev, Álvaro Herrera, and me.

diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 92df7504ad57e5aafe0cff3c424d220db4d70647..e3d0d69b3f2b865163dc6ca69b372a8fd3d00e84 100644 (file)
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -94,6 +94,7 @@ static int    pthread_join(pthread_t th, void **thread_return);
 
 int            nxacts = 0;         /* number of transactions per client */
 int            duration = 0;       /* duration in seconds */
+int64      end_time = 0;       /* when to stop in micro seconds, under -T */
 
 /*
  * scaling factor. for example, scale = 10 will make 1000000 tuples in
@@ -1362,6 +1363,10 @@ top:
        thread->throttle_trigger += wait;
        st->txn_scheduled = thread->throttle_trigger;
 
+       /* stop client if next transaction is beyond pgbench end of execution */
+       if (duration > 0 && st->txn_scheduled > end_time)
+           return clientDone(st, true);
+
        /*
         * If this --latency-limit is used, and this slot is already late so
         * that the transaction will miss the latency limit even if it
@@ -3582,6 +3587,11 @@ main(int argc, char **argv)
 
        INSTR_TIME_SET_CURRENT(thread->start_time);
 
+       /* compute when to stop */
+       if (duration > 0)
+           end_time = INSTR_TIME_GET_MICROSEC(thread->start_time) +
+               (int64) 1000000 * duration;
+
        /* the first thread (i = 0) is executed by main thread */
        if (i > 0)
        {
@@ -3600,6 +3610,10 @@ main(int argc, char **argv)
    }
 #else
    INSTR_TIME_SET_CURRENT(threads[0].start_time);
+   /* compute when to stop */
+   if (duration > 0)
+       end_time = INSTR_TIME_GET_MICROSEC(threads[0].start_time) +
+           (int64) 1000000 * duration;
    threads[0].thread = INVALID_THREAD;
 #endif   /* ENABLE_THREAD_SAFETY */