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CULA • View topic - Runtime Error (17) culaDeviceSgesv with cudaHostAl

Runtime Error (17) culaDeviceSgesv with cudaHostAl

General CULA Dense (LAPACK & BLAS) support and troubleshooting. Use this forum if you are having a general problem or have encountered a bug.

Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby konod » Tue Mar 23, 2010 6:40 pm

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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby dan » Tue Mar 23, 2010 8:28 pm

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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby konod » Tue Mar 23, 2010 9:42 pm

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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby dan » Wed Mar 24, 2010 3:34 pm

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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby konod » Sun Mar 28, 2010 4:57 pm

Hi, Dan

I attach the output of sysinfo.bat script.

I think that using the cudaHostAllocMapped memory regards to speed up the program, dose not it?

Sincerely yours

Kohei [file name=sysinforeport.zip size=218541]http://www.culatools.com/images/fbfiles/files/sysinforeport.zip[/file]
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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby kyle » Tue Mar 30, 2010 10:10 am

cudaHostAllocMapped is designed for integrated GPUs that can utilize system memory. In these cases you don't need to explicitly copy memory to the GPU, just create an alias. Hence the term "zero copy".

This feature is typically only found in mid-to-high range laptops. Using this type of memory on a dedicated card, like your GTX 280, doesn't make sense because there is no memory shared between the host and device. You'll probably even see a large slowdown because CUDA will automatically synchronize the two memory location with every GPU operation!
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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby konod » Sun Apr 04, 2010 7:10 pm

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Re:Runtime Error (17) culaDeviceSgesv with cudaHostAl

Postby kyle » Mon Apr 05, 2010 7:42 am

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