On Tue, 8 Dec 2020 at 15:04, Andres Freund wrote:
> Hi,
>
> On 2020-12-08 04:24:44 +, tsunakawa.ta...@fujitsu.com wrote:
> > I'm looking forward to this from the async+direct I/O, since the
> > throughput of some write-heavy workload decreased by half or more
> > during checkpointing (due to
On 2020/12/08 11:55, Craig Ringer wrote:
Hi all
A new kernel API called io_uring has recently come to my attention. I assume
some of you (Andres?) have been following it for a while.
io_uring appears to offer a way to make system calls including reads, writes,
fsync()s, and more in a non-b
Hi,
On 2020-12-08 04:24:44 +, tsunakawa.ta...@fujitsu.com wrote:
> I'm looking forward to this from the async+direct I/O, since the
> throughput of some write-heavy workload decreased by half or more
> during checkpointing (due to fsync?)
Depends on why that is. The most common, I think, caus
Hi,
On 2020-12-08 13:01:38 +0800, Craig Ringer wrote:
> Have you done much bpf / systemtap / perf based work on measurement and
> tracing of latencies etc? If not that's something I'd be keen to help with.
> I've mostly been using systemtap so far but I'm trying to pivot over to
> bpf.
Not much -
On Tue, 8 Dec 2020 at 12:02, Andres Freund wrote:
> Hi,
>
> On 2020-12-08 10:55:37 +0800, Craig Ringer wrote:
> > A new kernel API called io_uring has recently come to my attention. I
> > assume some of you (Andres?) have been following it for a while.
>
> Yea, I've spent a *lot* of time working
From: Andres Freund
> Especially with direct IO
> checkpointing can be a lot faster *and* less impactful on the "regular"
> load.
I'm looking forward to this from the async+direct I/O, since the throughput of
some write-heavy workload decreased by half or more during checkpointing (due
to fsync
Hi,
On 2020-12-08 10:55:37 +0800, Craig Ringer wrote:
> A new kernel API called io_uring has recently come to my attention. I
> assume some of you (Andres?) have been following it for a while.
Yea, I've spent a *lot* of time working on AIO support, utilizing
io_uring. Recently Thomas also joined
On 12/8/20 3:55 AM, Craig Ringer wrote:
A new kernel API called io_uring has recently come to my attention. I
assume some of you (Andres?) have been following it for a while.
Andres did a talk on this at FOSDEM PGDay earlier this year. You can see
his slides below, but since they are from Janu
On Tue, Dec 8, 2020 at 3:56 PM Craig Ringer
wrote:
> I thought I'd start the discussion on this and see where we can go with it.
> What incremental steps can be done to move us toward parallelisable I/O
> without having to redesign everything?
>
> I'm thinking that redo is probably a good first
References to get things started:
* https://lwn.net/Articles/810414/
* https://unixism.net/loti/what_is_io_uring.html
*
https://blogs.oracle.com/linux/an-introduction-to-the-io_uring-asynchronous-io-framework
*
https://thenewstack.io/how-io_uring-and-ebpf-will-revolutionize-programming-in-linux/
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