[Mono-dev] substantial performance regression between 2.10 and 2.6 or impl diff?
jonathan.shore at gmail.com
Sat Aug 27 14:15:57 EDT 2011
My machine is an old 2006 Mac Pro 1,1 2 x Xeon 5130 (64 bit) running OSX lion. Here are the respective versions of mono:
Mono on OSX:
Mono JIT compiler version 2.10.4 (tarball Mon Aug 8 22:03:39 EDT 2011)
Copyright (C) 2002-2011 Novell, Inc, Xamarin, Inc and Contributors. www.mono-project.com
Misc: debugger softdebug
GC: Included Boehm (with typed GC)
Mono on Ubuntu 11.04 (running in VMWare VM on same machine):
Mono JIT compiler version 2.6.7 (Debian 2.6.7-5ubuntu3)
Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com
GC: Included Boehm (with typed GC and Parallel Mark)
Here is the Mac OSX mono 2.10.4 run:
$ mono main.exe
struct sum: 5000089998356.48, time: 9.010549 secs
class sum: 5000089998356.48, time: 30.67357 secs
Here is the Ubuntu 11.04 mono 2.6.7 run:
$ mono main.exe
struct sum: 5000089998356.48, time: 2.737732 secs
class sum: 5000089998356.48, time: 7.83984 secs
Note that the running time for mono 2.6.7 is ~4x faster than mono 2.10.4 on the same box (and the linux run has the disadvantage of running on a VM). The struct test is most likely not exercising the GC and the later is. I suspect given the consistent performance difference is *not* a GC issue, rather a difference in the JIT code generation.
Let me know if there is other information I can provide. Thanks.
On Aug 27, 2011, at 1:52 PM, Slide wrote:
> On Sat, Aug 27, 2011 at 10:27 AM, Jonathan Shore <jonathan.shore at gmail.com> wrote:
> 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.
> Can you publish your benchmark numbers and for what machines you are running on?
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