llvm dev - Sep 2020 - LLVM Developers Meeting JIT BoF -- Request for Topics of Interest

Hi All,

The 2020 Virtual LLVM Developer's Meeting is coming up the week after next.
I'll be hosting a JIT Birds-of-a-Feather session on Thursday the 8th at
10:55am PDT (See http://llvm.org/devmtg/2020-09/schedule/). I'm planning to
run this more like a Round Table: Minimal introduction, plenty of time for
discussion.

Does anyone have any LLVM JIT related topics that they would particularly
like to discuss at this session? Any questions that they think could be
best answered by a round-table style discussion? I'll aim to rope in the
right people and prepare answers to make sure we get the most out of the
session.

Looking forward to seeing you all there!

-- Lang.
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Hi,

On 2020-09-25 19:05:42 -0700, Lang Hames wrote:
> The 2020 Virtual LLVM Developer's Meeting is coming up the week after
next.
> I'll be hosting a JIT Birds-of-a-Feather session on Thursday the 8th at
> 10:55am PDT (See http://llvm.org/devmtg/2020-09/schedule/). I'm
planning to
> run this more like a Round Table: Minimal introduction, plenty of time for
> discussion.
> 
> Does anyone have any LLVM JIT related topics that they would particularly
> like to discuss at this session? Any questions that they think could be
> best answered by a round-table style discussion? I'll aim to rope in
the
> right people and prepare answers to make sure we get the most out of the
> session.
A topic that I'd find interesting is what it'd take to make it easier to
use profile guided optimization in the context of JIT.  A few years back
I crudely hacked this together, but it was fairly ugly. It'd be nice to
make that easier.  Possibly too complicated for that type of session?

I dimly recall that the main issue was that there is no good way to
extract the profile information without going through files / applying
the profile data without going through files.

Greetings,

Andres Freund

Hi Andres,

A topic that I'd find interesting is what it'd take to make it easier
to
> use profile guided optimization in the context of JIT.  A few years back
> I crudely hacked this together, but it was fairly ugly. It'd be nice to
> make that easier.  Possibly too complicated for that type of session?

We couldn't go into detail, but we could kick off a discussion and identify
who is interested in working on this. My pitch: We should solve this
by investing in JITLink and implementing profiling (and debugger support)
via ObjectLinkingLayer::Plugins. Maybe a brief overview of / discussion on
how these work would be useful?

-- Lang.


On Fri, Sep 25, 2020 at 7:19 PM Andres Freund <andres at anarazel.de>
wrote:
> Hi,
>
> On 2020-09-25 19:05:42 -0700, Lang Hames wrote:
> > The 2020 Virtual LLVM Developer's Meeting is coming up the week
after
> next.
> > I'll be hosting a JIT Birds-of-a-Feather session on Thursday the
8th at
> > 10:55am PDT (See http://llvm.org/devmtg/2020-09/schedule/). I'm
> planning to
> > run this more like a Round Table: Minimal introduction, plenty of time
> for
> > discussion.
> >
> > Does anyone have any LLVM JIT related topics that they would
particularly
> > like to discuss at this session? Any questions that they think could
be
> > best answered by a round-table style discussion? I'll aim to rope
in the
> > right people and prepare answers to make sure we get the most out of
the
> > session.
>
> A topic that I'd find interesting is what it'd take to make it
easier to
> use profile guided optimization in the context of JIT.  A few years back
> I crudely hacked this together, but it was fairly ugly. It'd be nice to
> make that easier.  Possibly too complicated for that type of session?
>
> I dimly recall that the main issue was that there is no good way to
> extract the profile information without going through files / applying
> the profile data without going through files.
>
> Greetings,
>
> Andres Freund
>
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Hi,
I would like to discuss the future/potential use-cases of LLVM JIT. I'm
also interested in reducing the compilation time of code in JIT component
independent of static compiler. Is it sounds interesting? :)


On Sat, 26 Sep 2020 at 07:49, Andres Freund <andres at anarazel.de> wrote:
> Hi,
>
> On 2020-09-25 19:05:42 -0700, Lang Hames wrote:
> > The 2020 Virtual LLVM Developer's Meeting is coming up the week
after
> next.
> > I'll be hosting a JIT Birds-of-a-Feather session on Thursday the
8th at
> > 10:55am PDT (See http://llvm.org/devmtg/2020-09/schedule/). I'm
> planning to
> > run this more like a Round Table: Minimal introduction, plenty of time
> for
> > discussion.
> >
> > Does anyone have any LLVM JIT related topics that they would
particularly
> > like to discuss at this session? Any questions that they think could
be
> > best answered by a round-table style discussion? I'll aim to rope
in the
> > right people and prepare answers to make sure we get the most out of
the
> > session.
>
> A topic that I'd find interesting is what it'd take to make it
easier to
> use profile guided optimization in the context of JIT.  A few years back
> I crudely hacked this together, but it was fairly ugly. It'd be nice to
> make that easier.  Possibly too complicated for that type of session?
>
> I dimly recall that the main issue was that there is no good way to
> extract the profile information without going through files / applying
> the profile data without going through files.
>
> Greetings,
>
> Andres Freund
>
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