[Mono-dev] substantial performance regression between 2.10 and 2.6 or impl diff?

[Jonathan Shore]

Rodrigo,

The class based object part of the test is definitely GC sensitive.  However, I and others have noted a performance drop for the struct based test (the other test in this simple benchmark), which should not be impacted by GC.   I did two tests of the struct-based approach, one with 2.6.x OSX and 2.10.x and there was a consistent difference.    

I also have a linux box, so am trying to build 2.10.x (as the packages available are 2.6.x).   I expect, as others have found, that the struct performance will be lower in 2.10.x, even on linux.

I will post results later if I manage to build this successfully.

Jonathan

On Aug 27, 2011, at 7:09 PM, Rodrigo Kumpera wrote:

> There are a few points to note here.
> 
> Linux with the default GC is much faster than OSX since the laster can't use fast object allocation.
> 
> OSX 2.6 shipped with default parallel mark enabled on OSX, but it was later disabled due to bugs in boehm.
> 
> Given no one is actively working on boehm, this was the best option. My suggestion is that you try using the new GC
> try running 2.10 with --gc=sgen. Performance will be substantially better for your test.
>   
> 
> On Sat, Aug 27, 2011 at 2:27 PM, Jonathan Shore <jonathan.shore at gmail.com> wrote:
> Hi,
> 
> I was doing some benchmarks of struct vs class based creation (I have an application that will generate millions of small objects).   I was doing the tests in a ubuntu 11.4 VM on my mac pro and found the following:
> 
> 	mono 2.6.7 was 4x faster on my linux VM than 2.10.4 running on OSX (same machine)
> 
> I don't know whether this may be because of one of the following:
> 
> - performance in 2.10.4 regressed vs 2.6.7
> - mono JIT implementation for OSX has a completely different JiT codebase and does not perform
> - difference in GC (only relevant for second part of the test)
> 
> Note that I tried this with separate compilations with mcs -optimize+  on both environments as well as running the same exe on both.
> 
> I can live with slower performance on OSX, but want to make sure that linux and windows versions of mono 2.10.x have the performance of 2.6.7 or better.
> 
> Can someone clue me in?   I've included the simple test code with this posting.
> 
> Thanks
> 
> Jonathan
> 
> 
> 
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