5x 1080 TI on linux

[fl0at0xff]

hello, below the output. Seems to have some bug with CUDA. I only connected 3 GPU for now. 

Code:

Successfully initialized NVIDIA CUDA library. Failed to initialize NVIDIA RTC library. * Device #1: CUDA SDK Toolkit not installed or incorrectly installed.             CUDA SDK Toolkit required for proper device support and utilization.             Falling back to OpenCL runtime. Successfully initialized NVIDIA CUDA library. Failed to initialize NVIDIA RTC library. * Device #2: CUDA SDK Toolkit not installed or incorrectly installed.             CUDA SDK Toolkit required for proper device support and utilization.             Falling back to OpenCL runtime. Successfully initialized NVIDIA CUDA library. Failed to initialize NVIDIA RTC library. * Device #3: CUDA SDK Toolkit not installed or incorrectly installed.             CUDA SDK Toolkit required for proper device support and utilization.             Falling back to OpenCL runtime. * Device #4: Outdated POCL OpenCL driver detected! OpenCL Info: ============ OpenCL Platform ID #1   Vendor..: NVIDIA Corporation   Name....: NVIDIA CUDA   Version.: OpenCL 3.0 CUDA 11.7.99   Backend Device ID #1     Type...........: GPU     Vendor.ID......: 32     Vendor.........: NVIDIA Corporation     Name...........: NVIDIA GeForce GTX 1080 Ti     Version........: OpenCL 3.0 CUDA     Processor(s)...: 28     Clock..........: 1582     Memory.Total...: 11176 MB (limited to 2794 MB allocatable in one block)     Memory.Free....: 11008 MB     OpenCL.Version.: OpenCL C 1.2     Driver.Version.: 515.57     PCI.Addr.BDF...: 01:00.0   Backend Device ID #2     Type...........: GPU     Vendor.ID......: 32     Vendor.........: NVIDIA Corporation     Name...........: NVIDIA GeForce GTX 1080 Ti     Version........: OpenCL 3.0 CUDA     Processor(s)...: 28     Clock..........: 1582     Memory.Total...: 11178 MB (limited to 2794 MB allocatable in one block)     Memory.Free....: 11008 MB     OpenCL.Version.: OpenCL C 1.2     Driver.Version.: 515.57     PCI.Addr.BDF...: 03:00.0   Backend Device ID #3     Type...........: GPU     Vendor.ID......: 32     Vendor.........: NVIDIA Corporation     Name...........: NVIDIA GeForce GTX 1080 Ti     Version........: OpenCL 3.0 CUDA     Processor(s)...: 28     Clock..........: 1582     Memory.Total...: 11178 MB (limited to 2794 MB allocatable in one block)     Memory.Free....: 11008 MB     OpenCL.Version.: OpenCL C 1.2     Driver.Version.: 515.57     PCI.Addr.BDF...: 04:00.0 OpenCL Platform ID #2   Vendor..: The pocl project   Name....: Portable Computing Language   Version.: OpenCL 1.2 pocl 1.4, None+Asserts, LLVM 9.0.1, RELOC, SLEEF, DISTRO, POCL_DEBUG   Backend Device ID #4     Type...........: CPU     Vendor.ID......: 128     Vendor.........: GenuineIntel     Name...........: pthread-Intel(R) Core(TM) i3-7100 CPU @ 3.90GHz     Version........: OpenCL 1.2 pocl HSTR: pthread-x86_64-pc-linux-gnu-skylake     Processor(s)...: 4     Clock..........: 3900     Memory.Total...: 5873 MB (limited to 1024 MB allocatable in one block)     Memory.Free....: 2904 MB     OpenCL.Version.: OpenCL C 1.2 pocl     Driver.Version.: 1.4

I think I need to install CUDA SDK too ?