Re: [PATCH 2/4] fsstress: reduce the number of events when io_setup

[Jeff Moyer <jmoyer@redhat.com>]

Zorro Lang <zlang@redhat.com> writes:

> The original number(128) of aio events for io_setup is a little big.
> When try to run lots of fsstress processes(e.g. -p 1000) always hit
> io_setup EAGAIN error, due to the nr_events exceeds the limit of
> available events. So reduce it from 128 to 64, to make more fsstress
> processes can do AIO test.

It looks to me as though there's only ever one request in flight.  I'd
just set it to 1.

Also, you've included another change not mentioned in your changelog.
Please make sure the changelog matches what's done in the patch.

-Jeff

>
> Signed-off-by: Zorro Lang <zlang@redhat.com>
> ---
>  ltp/fsstress.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/ltp/fsstress.c b/ltp/fsstress.c
> index 388ace50..a11206d4 100644
> --- a/ltp/fsstress.c
> +++ b/ltp/fsstress.c
> @@ -28,6 +28,7 @@
>  #endif
>  #ifdef AIO
>  #include <libaio.h>
> +#define AIO_ENTRIES	64
>  io_context_t	io_ctx;
>  #endif
>  #ifdef URING
> @@ -699,8 +700,8 @@ int main(int argc, char **argv)
>  			}
>  			procid = i;
>  #ifdef AIO
> -			if (io_setup(128, &io_ctx) != 0) {
> -				fprintf(stderr, "io_setup failed");
> +			if (io_setup(AIO_ENTRIES, &io_ctx) != 0) {
> +				fprintf(stderr, "io_setup failed\n");
>  				exit(1);
>  			}
>  #endif
> @@ -714,7 +715,7 @@ int main(int argc, char **argv)
>  				doproc();
>  #ifdef AIO
>  			if(io_destroy(io_ctx) != 0) {
> -				fprintf(stderr, "io_destroy failed");
> +				fprintf(stderr, "io_destroy failed\n");
>  				return 1;
>  			}
>  #endif