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kangshuyi001
Journeyman III
‎12-22-2009 01:55 AM

only 128mb global mem available?

It seems something wrong with my hd4830 when I write opencl program, it only has 128M global mem, why?

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genaganna
Journeyman III
‎12-22-2009 02:18 AM

Originally posted by: kangshuyi001 It seems something wrong with my hd4830 when I write opencl program, it only has 128M global mem, why?

As per Spec,  Maximum size of memory object allocation is minimum of (1/4 th of maximum global memory available, 128MB)

See section 4.2 in Spec for more details.

 

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Fr4nz
In response to genaganna
Journeyman III
‎12-22-2009 06:48 AM

As per Spec,  Maximum size of memory object allocation is minimum of (1/4 th of maximum global memory available, 128MB)

 

See section 4.2 in Spec for more details.



 

This is true if you use the constant CL_DEVICE_MAX_MEM_ALLOC_SIZE with which clGetDeviceInfo must report 1/4th of the total mem available as allocable; the problem is that the same amount of memory is returned when you use the constant CL_DEVICE_GLOBAL_MEM_SIZE: in this case clGetDeviceInfo should report the "size of global memory device in bytes" (page 36 of the specs, revision 48), so 4 times the amount returned by CL_DEVICE_MAX_MEM_ALLOC_SIZE.

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genaganna
In response to Fr4nz
Journeyman III
‎12-22-2009 06:57 AM

Originally posted by: Fr4nz
As per Spec,  Maximum size of memory object allocation is minimum of (1/4 th of maximum global memory available, 128MB)

 

 

 

See section 4.2 in Spec for more details.



 

 

 

  This is true if you use the constant CL_DEVICE_MAX_MEM_ALLOC_SIZE with which clGetDeviceInfo must report 1/4th of the total mem available as allocable; the problem is that the same amount of memory is returned when you use the constant CL_DEVICE_GLOBAL_MEM_SIZE. In this case clGetDeviceInfo should report the "size of global memory in bytes" (page 36 of the specs, revision 48).

 

Just few hours back i reported this problem to developers. this will be fixed in upcoming release. Thank you for reporting this here http://forums.amd.com/forum/messageview.cfm?catid=390&threadid=124142&forumid=9.

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Fr4nz
In response to genaganna
Journeyman III
‎12-22-2009 07:00 AM

 

Just few hours back i reported this problem to developers. this will be fixed in upcoming release. Thank you for reporting this here http://forums.amd.com/forum/messageview.cfm?catid=390&threadid=124142&forumid=9.


No problem gena.

When do you think it will be released an update of the SDK?

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