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From: Christian Brauner <[email protected]>
To: Hao Xu <[email protected]>
Cc: [email protected], Jens Axboe <[email protected]>,
	Dominique Martinet <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Alexander Viro <[email protected]>,
	Stefan Roesch <[email protected]>, Clay Harris <[email protected]>,
	Dave Chinner <[email protected]>,
	[email protected], Wanpeng Li <[email protected]>
Subject: Re: [PATCH v4 0/5] io_uring getdents
Date: Wed, 19 Jul 2023 08:04:22 +0200	[thread overview]
Message-ID: <20230719-sitzkissen-mehrverbrauch-612a4dfcdeb5@brauner> (raw)
In-Reply-To: <[email protected]>

On Tue, Jul 18, 2023 at 09:21:07PM +0800, Hao Xu wrote:
> From: Hao Xu <[email protected]>
> 
> This series introduce getdents64 to io_uring, the code logic is similar
> with the snychronized version's. It first try nowait issue, and offload
> it to io-wq threads if the first try fails.
> 
> Tested it with a liburing case:
> https://github.com/HowHsu/liburing/blob/getdents/test/getdents2.c
> 
> The test is controlled by the below script[2] which runs getdents2.t 100
> times and calulate the avg.
> The result show that io_uring version is about 3% faster:
> 
> python3 run_getdents.py
>     Average of sync: 0.1036849
>     Average of iouring: 0.1005568
> 
> (0.1036849-0.1005568)/0.1036849 = 3.017%
> 
> note:
> [1] the number of getdents call/request in io_uring and normal sync version
> are made sure to be same beforehand.
> 
> [2] run_getdents.py
> 
> ```python3
> 
> import subprocess
> 
> N = 100
> sum = 0.0
> args = ["/data/home/howeyxu/tmpdir", "sync"]
> 
> for i in range(N):
>     output = subprocess.check_output(["./liburing/test/getdents2.t"] + args)
>     sum += float(output)
> 
> average = sum / N
> print("Average of sync:", average)
> 
> sum = 0.0
> args = ["/data/home/howeyxu/tmpdir", "iouring"]
> 
> for i in range(N):
>     output = subprocess.check_output(["./liburing/test/getdents2.t"] + args)
>     sum += float(output)
> 
> average = sum / N
> print("Average of iouring:", average)
> 
> ```
> 
> v3->v4:

I'm out this week so will review next week.

      parent reply	other threads:[~2023-07-19  6:04 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-18 13:21 [PATCH v4 0/5] io_uring getdents Hao Xu
2023-07-18 13:21 ` [PATCH 1/5] fs: split off vfs_getdents function of getdents64 syscall Hao Xu
2023-07-18 13:21 ` [PATCH 2/5] vfs_getdents/struct dir_context: add flags field Hao Xu
2023-07-18 13:21 ` [PATCH 3/5] io_uring: add support for getdents Hao Xu
2023-07-19  8:56   ` Hao Xu
2023-07-26 15:00   ` Christian Brauner
2023-07-27 11:51     ` Hao Xu
2023-07-27 14:27       ` Christian Brauner
2023-07-27 15:12         ` Pavel Begunkov
2023-07-27 15:52           ` Christian Brauner
2023-07-27 16:17             ` Pavel Begunkov
2023-07-27 16:28               ` Christian Brauner
2023-07-31  1:58                 ` Dave Chinner
2023-07-31  7:34                   ` Hao Xu
2023-07-31  7:50                     ` Christian Brauner
2023-07-31  7:40                   ` Christian Brauner
2023-07-30 18:02         ` Hao Xu
2023-07-31  8:18           ` Christian Brauner
2023-07-31  9:31             ` Hao Xu
2023-07-31  1:33         ` Dave Chinner
2023-07-31  8:13           ` Christian Brauner
2023-07-31 15:26             ` Darrick J. Wong
2023-07-31 22:18               ` Dave Chinner
2023-08-01  0:28               ` Jens Axboe
2023-08-01  0:47                 ` Matthew Wilcox
2023-08-01  0:49                   ` Jens Axboe
2023-08-01  1:01                     ` Matthew Wilcox
2023-08-01  7:00                       ` Christian Brauner
2023-08-01  6:59                     ` Christian Brauner
2023-08-01  7:17                 ` Christian Brauner
2023-08-08  4:34                 ` Hao Xu
2023-08-08  5:18                   ` Hao Xu
2023-08-08  9:33                 ` Hao Xu
2023-08-08 22:55                   ` Jens Axboe
2023-08-01 18:39             ` Hao Xu
2023-07-18 13:21 ` [PATCH 4/5] xfs: add NOWAIT semantics for readdir Hao Xu
2023-07-19  2:35   ` kernel test robot
2023-07-18 13:21 ` [PATCH RFC 5/5] disable fixed file for io_uring getdents for now Hao Xu
2023-07-26 14:23   ` Christian Brauner
2023-07-27 12:09     ` Hao Xu
2023-07-19  6:04 ` Christian Brauner [this message]

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