[Rtk-users] [EXTERNAL] Help with CudaForwardProjectionImageFilter

[Simon Rit]

Hi,
I think there is still a memory bug that has not been fixed but not
released yet see here <https://github.com/RTKConsortium/RTK/issues/612>.
Iterative reconstruction techniques currently load the whole volume and
projections in memory so the limit is how much you can fit in GPU memory +
intermediate volumes.
Simon

On Mon, Sep 23, 2024 at 9:53 PM Rahman, Obaid <rahmano at ornl.gov> wrote:

> Hi Simon,
>
> I have installed the latest openRTK, and the problem has been resolved.
> I can reconstruct volumes of 1200X1200X1200 which is more than 2^31-1.
>
> Do you know what is the max recon size I can get?
> Thanks.
>
> Best,
> Obaid
>
> On Apr 29, 2024, at 1:50 PM, Rahman, Obaid <rahmano at ornl.gov> wrote:
>
> Hi Simon,
>
> Thank you again for the prompt reply and for catching the issue.
> I have opened a new issue
> <https://github.com/RTKConsortium/RTK/issues/594> on Github.
> Thanks!
>
> Best,
> Obaid
>
> On Apr 29, 2024, at 11:40 AM, Simon Rit <simon.rit at creatis.insa-lyon.fr>
> wrote:
>
> Thanks. I think I understood the issue. Your code indicates this line for
> the initial error:
>
> https://github.com/SimonRit/RTK/blob/86d1e83d5341a6a7a85400d550d4759b46653522/src/rtkCudaUtilities.cu#L115
> <https://urldefense.us/v2/url?u=https-3A__github.com_SimonRit_RTK_blob_86d1e83d5341a6a7a85400d550d4759b46653522_src_rtkCudaUtilities.cu-23L115&d=DwMFaQ&c=v4IIwRuZAmwupIjowmMWUmLasxPEgYsgNI-O7C4ViYc&r=J7uT21mkGp7aMwIrHQkTLGwy72wKx_bOB0IkoGp__bQ&m=dX-bgc0aI76oeRMh3MT7_0hyVzTmxOdz7j3ilY3C85ebAPukM8PNxaaKOMC36gHw&s=lQAUBe9IGLcHtcPqqiWGjq1BYkPWmQBQsyqrbZGZssA&e=>
> The numel variable two lines above is computed as an int, which max value
> (2^31-1=2147483647) is below 1264*1356*1356=2324162304. Larger GPU memory
> comes with new bugs! Can you report your issue on github and I'll fix this
> quickly?
> Thanks in advance,
> Simon
>
>
>
>
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