libaio: Add hint on libaio engine init failing

If io_queue_init() fails, it's likely due to a lack of
aio request resources.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/engines/libaio.c b/engines/libaio.c
index eea8f55372ea17b59ad6e9e9c78006f963f63c54..7ef3ff8074d005be36a3ef5d90926dc1cc683a0e 100644 (file)
--- a/engines/libaio.c
+++ b/engines/libaio.c
@@ -194,6 +194,7 @@ static int fio_libaio_init(struct thread_data *td)
        err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
        if (err) {
                td_verror(td, -err, "io_queue_init");
+               log_err("fio: check /proc/sys/fs/aio-max-nr\n");
                free(ld);
                return 1;
        }