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[codeboycjy]

Hi:
   In my program, there is an empty scatter which costs 15 million seconds some times at half chance.
   What's so special about scatter?
   Or there is some configuration i've set is wrong.

   Thanks for ur help.

[gaurav_garg]

There are some limitation on ATI hardware with scatter. Brook+ runtime tries to virtualize these limitation on cost of some performance overhead. If you want to avoid these virtualizations, you should use a 128-bit (float4, int4, double2) 1D stream with size < 8192 as scatter stream.

Let me know what changes you see in performance if you use the above mentioned configuration for scatter stream.

[codeboycjy]

I've tried. It seems like the performance is improved if i use 1-D stream.

Thanks for ur help. I'll keep on my work.