Fix thread hang when using async engines (libaio,etc.) when too low of a iops rate...

[fio.git] / io_u.c

diff --git a/io_u.c b/io_u.c
index 703d1e85e45ad570715d237bd3dc96fccff6f020..428b312c9b34fea3cd1db6d38b375fd1a14376e6 100644 (file)
--- a/io_u.c
+++ b/io_u.c
@@ -496,12 +496,17 @@ static enum fio_ddir rate_ddir(struct thread_data *td, enum fio_ddir ddir)
 
        /*
         * We are going to sleep, ensure that we flush anything pending as
-        * not to skew our latency numbers
+        * not to skew our latency numbers.
+        *
+        * Changed to only monitor 'in flight' requests here instead of the
+        * td->cur_depth, b/c td->cur_depth does not accurately represent
+        * io's that have been actually submitted to an async engine,
+        * and cur_depth is meaningless for sync engines.
         */
-       if (td->cur_depth) {
+       if (td->io_u_in_flight) {
                int fio_unused ret;
 
-               ret = io_u_queued_complete(td, td->cur_depth, NULL);
+               ret = io_u_queued_complete(td, td->io_u_in_flight, NULL);
        }
 
        fio_gettime(&t, NULL);