[Qemu-devel] TCG Multithreading performance improvement

[Qemu-devel] TCG Multithreading performance improvement

[Mark Burton]

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Hi all,

We are now actively going to pursue TCG Multithreading to improve the performance of the TCG for Qemu models that include multiple cores.

We have set up a wiki page to track the project 
http://wiki.qemu.org/Features/tcg-multithread <http://wiki.qemu.org/Features/tcg-multithread>

At this point, I would like to invite everybody to email us ideas about how the project should progress, and ideas that might be useful (e.g. people who have tried this before, source code that might be helpful, what order we should attack things in etc)…

So - PLEASE let us know if you have interest in this topic, or information that might help

Cheers

Mark.





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Re: [Qemu-devel] TCG Multithreading performance improvement

[Peter Maydell]

On 26 November 2014 at 09:31, Mark Burton <mark.burton@greensocs.com> wrote:
> We have set up a wiki page to track the project
> http://wiki.qemu.org/Features/tcg-multithread

I see you write "The TCG today is close to being thread safe".
Personally I would phrase this as "TCG today is not at all
thread safe" :-)

-- PMM

Re: [Qemu-devel] TCG Multithreading performance improvement

[Claudio Fontana]

On 26.11.2014 15:06, Peter Maydell wrote:
> On 26 November 2014 at 09:31, Mark Burton <mark.burton@greensocs.com> wrote:
>> We have set up a wiki page to track the project
>> http://wiki.qemu.org/Features/tcg-multithread
> 
> I see you write "The TCG today is close to being thread safe".
> Personally I would phrase this as "TCG today is not at all
> thread safe" :-)
> 
> -- PMM
> 

Always nitpicking.. :-)

Re: [Qemu-devel] TCG Multithreading performance improvement

[Alex Bennée]

Mark Burton <mark.burton@greensocs.com> writes:

> Hi all,
>
> We are now actively going to pursue TCG Multithreading to improve the performance of the TCG for Qemu models that include multiple cores.
>
> We have set up a wiki page to track the project 
> http://wiki.qemu.org/Features/tcg-multithread <http://wiki.qemu.org/Features/tcg-multithread>
>
> At this point, I would like to invite everybody to email us ideas about how the project should progress, and ideas that might be useful (e.g. people who have tried this before, source code that might be helpful, what order we should attack things in etc)…
>
> So - PLEASE let us know if you have interest in this topic, or
> information that might help

I've added some *incomplete* notes to the wiki page. I'm also happy to
get involved and help with design and code review.

-- 
Alex Bennée

Re: [Qemu-devel] TCG Multithreading performance improvement

[Chih-Min Chao]

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Another good slide for PQemu
http://people.cs.nctu.edu.tw/~chenwj/slide/QEMU/PQEMU_presentation_(IIS_Sinica_2)_.pptx

On Wed, Nov 26, 2014 at 5:31 PM, Mark Burton <mark.burton@greensocs.com>
wrote:

>
>
> Hi all,
>
> We are now actively going to pursue TCG Multithreading to improve the
> performance of the TCG for Qemu models that include multiple cores.
>
> We have set up a wiki page to track the project
> http://wiki.qemu.org/Features/tcg-multithread
>
> At this point, I would like to invite everybody to email us ideas about
> how the project should progress, and ideas that might be useful (e.g.
> people who have tried this before, source code that might be helpful, what
> order we should attack things in etc)…
>
> So - PLEASE let us know if you have interest in this topic, or information
> that might help
>
> Cheers
>
> Mark.
>
>
>
>
>
> ------------------------------
>  +44 (0)20 7100 3485 x 210
>  +33 (0)5 33 52 01 77x 210
>
> +33 (0)603762104mark.burton <http://www.greensocs.com>
>
>

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Re: [Qemu-devel] TCG Multithreading performance improvement

[Lluís Vilanova]

Mark Burton writes:

> Hi all,
> We are now actively going to pursue TCG Multithreading to improve the
> performance of the TCG for Qemu models that include multiple cores.

> We have set up a wiki page to track the project 
> http://wiki.qemu.org/Features/tcg-multithread

> At this point, I would like to invite everybody to email us ideas about how the
> project should progress, and ideas that might be useful (e.g. people who have
> tried this before, source code that might be helpful, what order we should
> attack things in etc)…

> So - PLEASE let us know if you have interest in this topic, or information that
> might help

This is great news! I've added a new subsection on the wiki to hold some
problems that should be kept in mind while designing a solution.

For now, I've added memory consistency and instruction atomicity issues in it.


Best,
  Lluis

-- 
 "And it's much the same thing with knowledge, for whenever you learn
 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth

Re: [Qemu-devel] TCG Multithreading performance improvement

[Mark Burton]

> On 26 Nov 2014, at 20:12, Lluís Vilanova <vilanova@ac.upc.edu> wrote:
> 
> Mark Burton writes:
> 
>> Hi all,
>> We are now actively going to pursue TCG Multithreading to improve the
>> performance of the TCG for Qemu models that include multiple cores.
> 
>> We have set up a wiki page to track the project 
>> http://wiki.qemu.org/Features/tcg-multithread
> 
>> At this point, I would like to invite everybody to email us ideas about how the
>> project should progress, and ideas that might be useful (e.g. people who have
>> tried this before, source code that might be helpful, what order we should
>> attack things in etc)…
> 
>> So - PLEASE let us know if you have interest in this topic, or information that
>> might help
> 
> This is great news! I've added a new subsection on the wiki to hold some
> problems that should be kept in mind while designing a solution.
> 
> For now, I've added memory consistency and instruction atomicity issues in it.

Thanks !  - Those are the two big issues I think :-)))


Cheers

Mark.

> 
> 
> Best,
>  Lluis
> 
> -- 
> "And it's much the same thing with knowledge, for whenever you learn
> something new, the whole world becomes that much richer."
> -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
> Tollbooth


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	mark.burton