[Mono-osx] Horrible performance on Mac, need advice.
gnorton at novell.com
Mon Jul 20 16:32:27 EDT 2009
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.
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 126.96.36.199 + Mac OS X. The exact same binary runs in
> real-time on Mono + Windows. Mac performance is literally dozens of
> 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
> disk, processed via some mathematical operations, then rendered on
> 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
> This is very fast on my windows machine on both Mono and Microsoft
> 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
> Anyway, shall I prepare a small project that illustrates the
> algorithm? The
> performance differences are so huge I have to believe there is
> 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?:-(
> View this message in context: http://www.nabble.com/Horrible-performance-on-Mac%2C-need-advice.-tp24507897p24507897.html
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