gr-fosphor CL_INVALID_VALUE in clEnqueueFillBuffer call

Raj Bhattacharjea raj.b at gatech.edu
Fri Feb 3 17:04:42 UTC 2017


I'm using the latest fosphor from git
(7b6b9961bc2d9b84daeb42a5c8f8aeba293d207c) and am seeing two weird (and I
believe related) issues. Firstly, I see the following error:

[+] Selected device: TITAN X (Pascal)
[!] CL Error (-30, /home/user/gr-fosphor/lib/fosphor/cl.c:409): Unable to
queue clear of spectrum buffer

This is CL_INVALID_VALUE returning from clEnqueueFillBuffer, so I added
some debug fprints to cl.c to see what parameters were being passed
into clEnqueueFillBuffer:
Edits:
fprintf(stderr, "size = %d\n", 2 * 2 * sizeof(cl_float) * FOSPHOR_FFT_LEN);
fprintf(stderr, "pattern_size = %d\n", sizeof(float));
fprintf(stderr, "pattern = %p\n", &noise_floor);
fprintf(stderr, "offset = %d\n", 0);

Output:
size = 16384
pattern_size = 4
pattern = 0x7fb66b7fdd2c
offset = 0

These parameters look like they shouldn't cause CL_INVALID_VALUE:
https://www.khronos.org/registry/OpenCL/sdk/2.0/docs/man/xhtml/clEnqueueFillBuffer.html

But there is this one condition that might be met, which is that somehow
size (16384) is larger than the underlying buffer (cl->mem_spectrum). The
underlying OpenGL buffer being too small brings me to my next (I believe
related) issue. The spectrum plot in fosphor is weirdly pixelated, please
see the attachment, which shows a screencap from "osmocom_fft -F -f 100e6
-g 20 -s 10e6".

Where is the cl->mem_spectrum buffer ultimately declared / initialized? My
OpenCL / OpenGL sharing knowledge is nonexistent, any pointers for how I
can help debug this issue?

Output of clinfo is attached as well, and I'm on Ubuntu 16.04 on x86_64.



-- 
Raj Bhattacharjea, PhD
Georgia Tech Research Institute
Information and Communications Laboratory
http://www.prism.gatech.edu/~rb288/
404.407.6622
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Number of platforms                               1
  Platform Name                                   NVIDIA CUDA
  Platform Vendor                                 NVIDIA Corporation
  Platform Version                                OpenCL 1.2 CUDA 8.0.46
  Platform Profile                                FULL_PROFILE
  Platform Extensions                             cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts
  Platform Extensions function suffix             NV

  Platform Name                                   NVIDIA CUDA
Number of devices                                 1
  Device Name                                     TITAN X (Pascal)
  Device Vendor                                   NVIDIA Corporation
  Device Vendor ID                                0x10de
  Device Version                                  OpenCL 1.2 CUDA
  Driver Version                                  367.57
  Device OpenCL C Version                         OpenCL C 1.2 
  Device Type                                     GPU
  Device Profile                                  FULL_PROFILE
  Device Topology (NV)                            PCI-E, 05:00.0
  Max compute units                               28
  Max clock frequency                             1531MHz
  Compute Capability (NV)                         6.1
  Device Partition                                (core)
    Max number of sub-devices                     1
    Supported partition types                     None
  Max work item dimensions                        3
  Max work item sizes                             1024x1024x64
  Max work group size                             1024
  Preferred work group size multiple              32
  Warp size (NV)                                  32
  Preferred / native vector sizes                 
    char                                                 1 / 1       
    short                                                1 / 1       
    int                                                  1 / 1       
    long                                                 1 / 1       
    half                                                 0 / 0        (n/a)
    float                                                1 / 1       
    double                                               1 / 1        (cl_khr_fp64)
  Half-precision Floating-point support           (n/a)
  Single-precision Floating-point support         (core)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  Yes
  Double-precision Floating-point support         (cl_khr_fp64)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  No
  Address bits                                    64, Little-Endian
  Global memory size                              12779454464 (11.9GiB)
  Error Correction support                        No
  Max memory allocation                           3194863616 (2.975GiB)
  Unified memory for Host and Device              No
  Integrated memory (NV)                          No
  Minimum alignment for any data type             128 bytes
  Alignment of base address                       4096 bits (512 bytes)
  Global Memory cache type                        Read/Write
  Global Memory cache size                        458752
  Global Memory cache line                        128 bytes
  Image support                                   Yes
    Max number of samplers per kernel             32
    Max size for 1D images from buffer            134217728 pixels
    Max 1D or 2D image array size                 2048 images
    Max 2D image size                             16384x32768 pixels
    Max 3D image size                             16384x16384x16384 pixels
    Max number of read image args                 256
    Max number of write image args                16
  Local memory type                               Local
  Local memory size                               49152 (48KiB)
  Registers per block (NV)                        65536
  Max constant buffer size                        65536 (64KiB)
  Max number of constant args                     9
  Max size of kernel argument                     4352 (4.25KiB)
  Queue properties                                
    Out-of-order execution                        Yes
    Profiling                                     Yes
  Prefer user sync for interop                    No
  Profiling timer resolution                      1000ns
  Execution capabilities                          
    Run OpenCL kernels                            Yes
    Run native kernels                            No
    Kernel execution timeout (NV)                 Yes
  Concurrent copy and kernel execution (NV)       Yes
    Number of async copy engines                  2
  printf() buffer size                            1048576 (1024KiB)
  Built-in kernels                                
  Device Available                                Yes
  Compiler Available                              Yes
  Linker Available                                Yes
  Device Extensions                               cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts

NULL platform behavior
  clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...)  NVIDIA CUDA
  clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...)   Success [NV]
  clCreateContext(NULL, ...) [default]            Success [NV]
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU)  No platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL)  No platform

ICD loader properties
  ICD loader Name                                 OpenCL ICD Loader
  ICD loader Vendor                               OCL Icd free software
  ICD loader Version                              2.2.8
  ICD loader Profile                              OpenCL 1.2
	NOTE:	your OpenCL library declares to support OpenCL 1.2,
		but it seems to support up to OpenCL 2.1 too.
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