Re: [PATCH v7] libgfortran: Replace mutex with rwlock

[Lipeng Zhu]

On 1/3/2024 5:14 PM, Lipeng Zhu wrote:



On 2023/12/21 19:42, Thomas Schwinge wrote:

Hi!

On 2023-12-13T21:52:29+0100, I wrote:

On 2023-12-12T02:05:26+, "Zhu, Lipeng"  wrote:

On 2023/12/12 1:45, H.J. Lu wrote:
On Sat, Dec 9, 2023 at 7:25 PM Zhu, Lipeng  
wrote:

On 2023/12/9 23:23, Jakub Jelinek wrote:

On Sat, Dec 09, 2023 at 10:39:45AM -0500, Lipeng Zhu wrote:

This patch try to introduce the rwlock and split the read/write to
unit_root tree and unit_cache with rwlock instead of the mutex to
increase CPU efficiency. In the get_gfc_unit function, the
percentage to step into the insert_unit function is around 30%, in
most instances, we can get the unit in the phase of reading the
unit_cache or unit_root tree. So split the read/write phase by
rwlock would be an approach to make it more parallel.

BTW, the IPC metrics can gain around 9x in our test server with
220 cores. The benchmark we used is
https://github.com/rwesson/NEAT



Ok for trunk, thanks.



Thanks! Looking forward to landing to trunk.



Pushed for you.



I've just filed 
"'libgomp.fortran/rwlock_1.f90', 'libgomp.fortran/rwlock_3.f90' 
execution test timeouts".

Would you be able to look into that?


See my update in there.


Grüße
  Thomas
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Updated in https://gcc.gnu.org/PR113005. Could you help to verify if the 
draft patch would fix the execution test timeout issue on your side?




Hi Thomas,

Any feedback from your side?

Regards,
Lipeng Zhu

Re: GCC GSoC 2024: Call for project ideas and mentors

[David Malcolm]

On Mon, 2024-01-15 at 18:48 +0100, Martin Jambor wrote:
> Hello,
> 
> another year has passed, Google has announced there will be again
> Google
> Summer of Code (GsoC) in 2024 and the deadline for organizations to
> apply is already approaching (February 6th).  I'd like to volunteer
> to
> be the main org-admin for GCC again but let me know if you think I
> shouldn't or that someone else should or if you want to do it
> instead.
> Otherwise I'll assume that I will and I hope that I can continue to
> rely
> on David Edelsohn and Thomas Schwinge to back me up and help me with
> some decision making along the way as my co-org-admins.

Hi Martin, thanks for stepping up, and thanks to you, David and Thomas
for your work on this in past years.

> 
>  The most important bit:
> 
> 
> I would like to ask all (moderately) seasoned GCC contributors to
> consider mentoring a contributor this year and ideally also come up
> with
> a project that they would like to lead.  I'm collecting proposal on
> our
> wiki page https://gcc.gnu.org/wiki/SummerOfCode - feel free to add
> yours
> to the top list there.  Or, if you are unsure, post your offer and
> project idea as a reply here to the mailing list.

I hope to mentor again this year; I've refreshed the analyzer ideas on
that page.


[...snip...]

Dave