[Mono-osx] Horrible performance on Mac, need advice.

[Geoff Norton]

I presumse you're doing a lot of Graphics.FromHwnd (handle); all over  
the place, this is a huge performance problem on the mac.  Try to  
coalesce your graphics updates intstead of doing a ton of one-offs.

-g

On 20-Jul-09, at 4:29 PM, LKeene wrote:

>
> Hello again folks.
>
> As the title says, I'm getting GAWD-AWFUL performance with my app when
> running on mono 2.4.2.1 + Mac OS X.  The exact same binary runs in  
> fluid
> real-time on Mono + Windows. Mac performance is literally dozens of  
> times
> slower. It (meaning my app) cannot be used on Mac like this. I've  
> gone from
> real-time to unusably slow.
>
> Here's what I'm seeing: I have data files that consist of 32-bit float
> values stored as plain old raw binary files.  The data is read from  
> the
> disk, processed via some mathematical operations, then rendered on  
> screen.
> I'm using 2 threads to read the data; the first thread reads a  
> scanline of
> data from the disk, copies it to a temp buffer, signals the other  
> thread and
> waits for an event from that thread before continuing. The other  
> thread gets
> signalled, copies the data from the temp buffer to a local buffer for
> processing, signals the first thread to read the next scanline from  
> the disk
> and, while that is occuring, begins to process the data in its local  
> buffer.
> This is very fast on my windows machine on both Mono and Microsoft  
> runtimes,
> but on Mac + Mono it must be two orders of magnitude slower...no, I  
> am not
> exagerating. You can imagine some of the looks I got from people  
> standing
> around
>
> Anyway, shall I prepare a small project that illustrates the  
> algorithm? The
> performance differences are so huge I have to believe there is  
> something
> fundamentally wrong "close to the metal". Hopefully its something  
> that can
> be fixed without too much fuss.
>
> Anybody else see this kind of performance hit?:-(
> -- 
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>
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