Re: [Vala] GObject allocation / referencing... Why is so slow?

[Jonathan Ryan <jryan curious-os com>]

Looks like mono is calling a function called mono_new_fast, maybe this 
is an optimzation due to the simplicity of the code? If that's the case 
mono might be treating them as if you just used a struct in C, which is 
also a different case. Sorry for sending so many separate emails.

On 01/14/2011 02:31 PM, Jonathan Ryan wrote:
> You're C code doesn't use GObject, so why are you comparing it to 
> GObject? GObject provides more functionality than your code, including 
> thread safe reference counting, which is also taking time up in the 
> profile.
>
> On 01/14/2011 02:25 PM, Jonathan Ryan wrote:
> > Second of all each iteration your object is being unreferenced. If do 
> > you a profile, ~6% of that time is being spent unreferening the 
> > object. This could also expalin the differences in time considering 
> > C#'s garbage collector does not use reference counting as does 
> > GObject, so it's problaby not deallocating those new objects you 
> > create them each loop, which would increase the time signifiacantly.
> >
> > On 01/14/2011 02:17 PM, Jonathan Ryan wrote:
> > > First of all your "Objects" aren't GObjects, you need to
> > >
> > > private class TestObject : Object
> > >
> > > for them to be GObjects. The generated code is much different.
> > >
> > > On 01/14/2011 11:28 AM, Marco Trevisan (Treviño) wrote:
> > > > I'm doing some benchmarks with Vala, but I found that its performances
> > > > aren't so great as I expected when a class is used, and mostly when 
> > > > it's
> > > > allocated/referenced multiple times...
> > > >
> > > > Consider, for example, the simple example attached... The source 
> > > > simply
> > > > allocates many TestObject's, referencing them in varius ways, and then
> > > > freeing them after some time. Maybe it's not perfect, but it does 
> > > > what I
> > > > wanted.
> > > >
> > > > However, also if the created object is very simple Vala with the 
> > > > gobject
> > > > profile it's quite slow.
> > > >
> > > > In fact, also if with the results can't be compared to the 
> > > > hand-written
> > > > C attached code (I've written it fastly, maybe it has errors :P),
> > > > comparing Vala+Gobject and Vala+Dova underlines some differences:
> > > >
> > > > |     N       |  Vala-Gobject  |   Vala-Dova  | Handwritten C | 
> > > > Mono C#  |
> > > > |-------------+----------------+--------------+--------------------------| 
> > > >
> > > > |   5000000   |     2.367s     |    0.952s    |    0.310s     |  
> > > > 0.404s  |
> > > > |-------------+----------------+--------------+---------------+----------| 
> > > >
> > > > |   50000000  |     24.224s    |    10.152s   |    3.169s     |  
> > > > 3.662s  |
> > > > |-------------+----------------+--------------+---------------+----------| 
> > > >
> > > > |  100000000  |     48.402s    |    20.364s   |    6.126s     |  
> > > > 7.112s  |
> > > > |------------------------------------------------------------------------| 
> > > >
> > > >
> > > > Now, the C code can't be beaten, of course, but if you compare the
> > > > Gobject profile to the Dova one (also if it's immature), there's a 
> > > > great
> > > > performance gap!
> > > >
> > > > And this gobject slowness is underlined in other more complex
> > > > benchmarks, compared to Dova too...
> > > >
> > > > I guess that a gobject structure is really more complex compared to 
> > > > the
> > > > ones defined by Dova (or by simple C), but if Vala has these
> > > > performances, due to GObject mamangement, even the (evil) Mono C# 
> > > > seems
> > > > to be better (code attached, ported from the Vala syntax).
> > > >
> > > > So, how to improve this? Is really everything related to gobject or is
> > > > it also Vala which has responsibilities in this?
> > > >
> > > >
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> > >
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