=============================== Debugging Gradescope Autograder =============================== This document is aimed at students who want to better understand how the Gradescope Autograder works and how they can debug they debug their code. Introduction ------------ The Gradescope Autograder has access to an Intel x86_64 CPU. As such, we are the Intel OpenAPI Runtime to run your OpenCL code. This is likely different then the platform you have used to develop it. DSMLP also has this driver available, but it is not the default. Accessing Intel OpenAPI Runtime on DSMLP ---------------------------------------- The starter code in the :code:`helper_lib` supports overriding the platform and device index. If you know the platform and device index, you can override these at runtime with by executing :code:`PLATFORM_INDEX=p DEVICE_INDEX=d make run`. To get :code:`p` and :code:`d`, you can execute :code:`clinfo`. Here is an example output. .. code-block:: bash 59960@ccrutchf-1340126:~$ clinfo Number of platforms 2 Platform Name Portable Computing Language Platform Vendor The pocl project Platform Version OpenCL 3.0 PoCL 6.0 Linux, Release, RELOC, LLVM 14.0.0, SLEEF, CUDA, POCL_DEBUG Platform Profile FULL_PROFILE Platform Extensions cl_khr_icd cl_khr_priority_hints cl_khr_throttle_hints cl_pocl_content_size cl_ext_buffer_device_address Platform Extensions with Version cl_khr_icd 0x400000 (1.0.0) cl_khr_priority_hints 0x400000 (1.0.0) cl_khr_throttle_hints 0x400000 (1.0.0) cl_pocl_content_size 0x400000 (1.0.0) cl_ext_buffer_device_address 0x1000 (0.1.0) Platform Numeric Version 0xc00000 (3.0.0) Platform Extensions function suffix POCL Platform Host timer resolution 1ns Platform Name Intel(R) OpenCL Platform Vendor Intel(R) Corporation Platform Version OpenCL 3.0 LINUX Platform Profile FULL_PROFILE Platform Extensions cl_khr_spirv_linkonce_odr cl_khr_fp64 cl_khr_fp16 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_3d_image_writes cl_khr_byte_addressable_store cl_khr_depth_images cl_khr_extended_bit_ops cl_khr_icd cl_khr_il_program cl_khr_suggested_local_work_size cl_intel_unified_shared_memory cl_intel_devicelib_assert cl_khr_subgroup_ballot cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_clustered_reduce cl_intel_subgroups cl_intel_subgroups_char cl_intel_subgroups_short cl_intel_subgroups_long cl_intel_required_subgroup_size cl_intel_spirv_subgroups cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_intel_device_attribute_query cl_intel_exec_by_local_thread cl_intel_vec_len_hint cl_intel_device_partition_by_names cl_khr_spir cl_khr_image2d_from_buffer cl_intel_concurrent_dispatch Platform Extensions with Version cl_khr_spirv_linkonce_odr 0x400000 (1.0.0) cl_khr_fp64 0x400000 (1.0.0) cl_khr_fp16 0x400000 (1.0.0) cl_khr_global_int32_base_atomics 0x400000 (1.0.0) cl_khr_global_int32_extended_atomics 0x400000 (1.0.0) cl_khr_local_int32_base_atomics 0x400000 (1.0.0) cl_khr_local_int32_extended_atomics 0x400000 (1.0.0) cl_khr_3d_image_writes 0x400000 (1.0.0) cl_khr_byte_addressable_store 0x400000 (1.0.0) cl_khr_depth_images 0x400000 (1.0.0) cl_khr_extended_bit_ops 0x400000 (1.0.0) cl_khr_icd 0x400000 (1.0.0) cl_khr_il_program 0x400000 (1.0.0) cl_khr_suggested_local_work_size 0x400000 (1.0.0) cl_intel_unified_shared_memory 0x400000 (1.0.0) cl_intel_devicelib_assert 0x400000 (1.0.0) cl_khr_subgroup_ballot 0x400000 (1.0.0) cl_khr_subgroup_shuffle 0x400000 (1.0.0) cl_khr_subgroup_shuffle_relative 0x400000 (1.0.0) cl_khr_subgroup_extended_types 0x400000 (1.0.0) cl_khr_subgroup_non_uniform_arithmetic 0x400000 (1.0.0) cl_khr_subgroup_non_uniform_vote 0x400000 (1.0.0) cl_khr_subgroup_clustered_reduce 0x400000 (1.0.0) cl_intel_subgroups 0x400000 (1.0.0) cl_intel_subgroups_char 0x400000 (1.0.0) cl_intel_subgroups_short 0x400000 (1.0.0) cl_intel_subgroups_long 0x400000 (1.0.0) cl_intel_required_subgroup_size 0x400000 (1.0.0) cl_intel_spirv_subgroups 0x400000 (1.0.0) cl_khr_int64_base_atomics 0x400000 (1.0.0) cl_khr_int64_extended_atomics 0x400000 (1.0.0) cl_intel_device_attribute_query 0x400000 (1.0.0) cl_intel_exec_by_local_thread 0x400000 (1.0.0) cl_intel_vec_len_hint 0x400000 (1.0.0) cl_intel_device_partition_by_names 0x400000 (1.0.0) cl_khr_spir 0x400000 (1.0.0) cl_khr_image2d_from_buffer 0x400000 (1.0.0) cl_intel_concurrent_dispatch 0x400000 (1.0.0) Platform Numeric Version 0xc00000 (3.0.0) Platform Extensions function suffix INTEL Platform Host timer resolution 1ns Platform Name Portable Computing Language Number of devices 2 Device Name cpu-cascadelake-Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz Device Vendor GenuineIntel Device Vendor ID 0x10006 Device Version OpenCL 3.0 PoCL HSTR: cpu-x86_64-pc-linux-gnu-cascadelake Device Numeric Version 0xc00000 (3.0.0) Driver Version 6.0 Device OpenCL C Version OpenCL C 1.2 PoCL Device OpenCL C all versions OpenCL C 0x400000 (1.0.0) OpenCL C 0x401000 (1.1.0) OpenCL C 0x402000 (1.2.0) OpenCL C 0xc00000 (3.0.0) Device OpenCL C features __opencl_c_3d_image_writes 0xc00000 (3.0.0) __opencl_c_images 0xc00000 (3.0.0) __opencl_c_atomic_order_acq_rel 0xc00000 (3.0.0) __opencl_c_atomic_order_seq_cst 0xc00000 (3.0.0) __opencl_c_atomic_scope_device 0xc00000 (3.0.0) __opencl_c_program_scope_global_variables 0xc00000 (3.0.0) __opencl_c_atomic_scope_all_devices 0xc00000 (3.0.0) __opencl_c_generic_address_space 0xc00000 (3.0.0) __opencl_c_work_group_collective_functions 0xc00000 (3.0.0) __opencl_c_read_write_images 0xc00000 (3.0.0) __opencl_c_subgroups 0xc00000 (3.0.0) __opencl_c_fp64 0xc00000 (3.0.0) __opencl_c_ext_fp32_global_atomic_add 0xc00000 (3.0.0) __opencl_c_ext_fp32_local_atomic_add 0xc00000 (3.0.0) __opencl_c_ext_fp32_global_atomic_min_max 0xc00000 (3.0.0) __opencl_c_ext_fp32_local_atomic_min_max 0xc00000 (3.0.0) __opencl_c_ext_fp64_global_atomic_add 0xc00000 (3.0.0) __opencl_c_ext_fp64_local_atomic_add 0xc00000 (3.0.0) __opencl_c_ext_fp64_global_atomic_min_max 0xc00000 (3.0.0) __opencl_c_ext_fp64_local_atomic_min_max 0xc00000 (3.0.0) __opencl_c_int64 0xc00000 (3.0.0) Latest comfornace test passed v2022-04-19-01 Device Type CPU Device Profile FULL_PROFILE Device Available Yes Compiler Available Yes Linker Available Yes Max compute units 64 Max clock frequency 3900MHz Device Partition (core) Max number of sub-devices 64 Supported partition types equally, by counts Supported affinity domains (n/a) Max work item dimensions 3 Max work item sizes 4096x4096x4096 Max work group size 4096 Preferred work group size multiple (device) 8 Preferred work group size multiple (kernel) 8 Max sub-groups per work group 128 Sub-group sizes (Intel) 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 Preferred / native vector sizes char 16 / 16 short 16 / 16 int 16 / 16 long 8 / 8 half 0 / 0 (n/a) float 16 / 16 double 8 / 8 (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 Address bits 64, Little-Endian Global memory size 402161725440 (374.5GiB) Error Correction support No Max memory allocation 137438953472 (128GiB) Unified memory for Host and Device Yes Shared Virtual Memory (SVM) capabilities (core) Coarse-grained buffer sharing Yes Fine-grained buffer sharing Yes Fine-grained system sharing Yes Atomics Yes Minimum alignment for any data type 128 bytes Alignment of base address 1024 bits (128 bytes) Preferred alignment for atomics SVM 64 bytes Global 64 bytes Local 64 bytes Atomic memory capabilities relaxed, acquire/release, sequentially-consistent, work-group scope, device scope, all-devices scope Atomic fence capabilities relaxed, acquire/release, sequentially-consistent, work-item scope, work-group scope, device scope Max size for global variable 64000 (62.5KiB) Preferred total size of global vars 1048576 (1024KiB) Global Memory cache type Read/Write Global Memory cache size 23068672 (22MiB) Global Memory cache line size 64 bytes Image support Yes Max number of samplers per kernel 16 Max size for 1D images from buffer 8589934592 pixels Max 1D or 2D image array size 2048 images Max 2D image size 65536x65536 pixels Max 3D image size 2048x2048x2048 pixels Max number of read image args 128 Max number of write image args 128 Max number of read/write image args 128 Pipe support No Max number of pipe args 0 Max active pipe reservations 0 Max pipe packet size 0 Local memory type Global Local memory size 1048576 (1024KiB) Max number of constant args 8 Max constant buffer size 1048576 (1024KiB) Generic address space support Yes Max size of kernel argument 1024 Queue properties (on host) Out-of-order execution Yes Profiling Yes Device enqueue capabilities (n/a) Queue properties (on device) Out-of-order execution No Profiling No Preferred size 0 Max size 0 Max queues on device 0 Max events on device 0 Prefer user sync for interop Yes Profiling timer resolution 1ns Execution capabilities Run OpenCL kernels Yes Run native kernels Yes Non-uniform work-groups No Work-group collective functions Yes Sub-group independent forward progress Yes IL version (n/a) ILs with version (n/a) printf() buffer size 16777216 (16MiB) Built-in kernels pocl.add.i8;org.khronos.openvx.scale_image.nn.u8;org.khronos.openvx.scale_image.bl.u8;org.khronos.openvx.tensor_convert_depth.wrap.u8.f32 Built-in kernels with version pocl.add.i8 0x402000 (1.2.0) org.khronos.openvx.scale_image.nn.u8 0x402000 (1.2.0) org.khronos.openvx.scale_image.bl.u8 0x402000 (1.2.0) org.khronos.openvx.tensor_convert_depth.wrap.u8.f32 0x402000 (1.2.0) Device Extensions cl_khr_byte_addressable_store 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_3d_image_writes cl_khr_command_buffer cl_khr_command_buffer_multi_device cl_khr_subgroups cl_intel_unified_shared_memory cl_ext_buffer_device_address cl_pocl_svm_rect cl_pocl_command_buffer_svm cl_pocl_command_buffer_host_buffer cl_khr_subgroup_ballot cl_khr_subgroup_shuffle cl_intel_subgroups cl_intel_subgroups_short cl_ext_float_atomics cl_intel_required_subgroup_size cl_khr_fp64 cl_khr_int64_base_atomics cl_khr_int64_extended_atomics Device Extensions with Version cl_khr_byte_addressable_store 0x400000 (1.0.0) cl_khr_global_int32_base_atomics 0x400000 (1.0.0) cl_khr_global_int32_extended_atomics 0x400000 (1.0.0) cl_khr_local_int32_base_atomics 0x400000 (1.0.0) cl_khr_local_int32_extended_atomics 0x400000 (1.0.0) cl_khr_3d_image_writes 0x400000 (1.0.0) cl_khr_command_buffer 0x9004 (0.9.4) cl_khr_command_buffer_multi_device 0x9001 (0.9.1) cl_khr_subgroups 0x400000 (1.0.0) cl_intel_unified_shared_memory 0x400000 (1.0.0) cl_ext_buffer_device_address 0x1000 (0.1.0) cl_pocl_svm_rect 0x9000 (0.9.0) cl_pocl_command_buffer_svm 0x9000 (0.9.0) cl_pocl_command_buffer_host_buffer 0x9000 (0.9.0) cl_khr_subgroup_ballot 0x400000 (1.0.0) cl_khr_subgroup_shuffle 0x400000 (1.0.0) cl_intel_subgroups 0x400000 (1.0.0) cl_intel_subgroups_short 0x400000 (1.0.0) cl_ext_float_atomics 0x400000 (1.0.0) cl_intel_required_subgroup_size 0x400000 (1.0.0) cl_khr_fp64 0x400000 (1.0.0) cl_khr_int64_base_atomics 0x400000 (1.0.0) cl_khr_int64_extended_atomics 0x400000 (1.0.0) Device Name NVIDIA GeForce RTX 2080 Ti Device Vendor NVIDIA Corporation Device Vendor ID 0x10de Device Version OpenCL 3.0 PoCL HSTR: CUDA-sm_75 Device Numeric Version 0xc00000 (3.0.0) Driver Version 6.0 Device OpenCL C Version OpenCL C 1.2 PoCL Device OpenCL C all versions OpenCL C 0x400000 (1.0.0) OpenCL C 0x401000 (1.1.0) OpenCL C 0x402000 (1.2.0) OpenCL C 0xc00000 (3.0.0) Device OpenCL C features __opencl_c_images 0xc00000 (3.0.0) __opencl_c_atomic_order_acq_rel 0xc00000 (3.0.0) __opencl_c_atomic_order_seq_cst 0xc00000 (3.0.0) __opencl_c_atomic_scope_device 0xc00000 (3.0.0) __opencl_c_program_scope_global_variables 0xc00000 (3.0.0) __opencl_c_generic_address_space 0xc00000 (3.0.0) __opencl_c_fp16 0xc00000 (3.0.0) __opencl_c_fp64 0xc00000 (3.0.0) Latest comfornace test passed (n/a) Device Type GPU Device Topology (NV) PCI-E, 0000:da:00.0 Device Profile FULL_PROFILE Device Available Yes Compiler Available Yes Linker Available Yes Max compute units 68 Max clock frequency 1620MHz Compute Capability (NV) 7.5 Device Partition (core) Max number of sub-devices 1 Supported partition types None Supported affinity domains (n/a) Max work item dimensions 3 Max work item sizes 1024x1024x64 Max work group size 1024 Preferred work group size multiple (device) 32 Preferred work group size multiple (kernel) 32 Warp size (NV) 32 Max sub-groups per work group 32 Preferred / native vector sizes char 1 / 1 short 1 / 1 int 1 / 1 long 1 / 1 half 0 / 0 (cl_khr_fp16) float 1 / 1 double 1 / 1 (cl_khr_fp64) Half-precision Floating-point support (cl_khr_fp16) Denormals No Infinity and NANs Yes Round to nearest Yes Round to zero No Round to infinity No IEEE754-2008 fused multiply-add No Support is emulated in software No 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 No 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 Address bits 64, Little-Endian Global memory size 11546394624 (10.75GiB) Error Correction support No Max memory allocation 11381768192 (10.6GiB) Unified memory for Host and Device No Integrated memory (NV) No Shared Virtual Memory (SVM) capabilities (core) Coarse-grained buffer sharing Yes Fine-grained buffer sharing Yes Fine-grained system sharing No Atomics No Minimum alignment for any data type 128 bytes Alignment of base address 4096 bits (512 bytes) Preferred alignment for atomics SVM 64 bytes Global 64 bytes Local 64 bytes Atomic memory capabilities relaxed, work-group scope Atomic fence capabilities relaxed, acquire/release, work-group scope Max size for global variable 0 Preferred total size of global vars 0 Global Memory cache type None Image support No Pipe support No Max number of pipe args 0 Max active pipe reservations 0 Max pipe packet size 0 Local memory type Local Local memory size 49152 (48KiB) Registers per block (NV) 65536 Max number of constant args 8 Max constant buffer size 65536 (64KiB) Generic address space support Yes Max size of kernel argument 4352 (4.25KiB) Queue properties (on host) Out-of-order execution No Profiling Yes Device enqueue capabilities (n/a) Queue properties (on device) Out-of-order execution No Profiling No Preferred size 0 Max size 0 Max queues on device 0 Max events on device 0 Prefer user sync for interop Yes Profiling timer resolution 1ns Execution capabilities Run OpenCL kernels Yes Run native kernels No Non-uniform work-groups No Work-group collective functions No Sub-group independent forward progress Yes Kernel execution timeout (NV) No Concurrent copy and kernel execution (NV) Yes Number of async copy engines 3 IL version (n/a) ILs with version (n/a) printf() buffer size 16777216 (16MiB) Built-in kernels pocl.mul.i32;pocl.add.i32;pocl.dnn.conv2d_int8_relu;pocl.sgemm.local.f32;pocl.sgemm.tensor.f16f16f32;pocl.sgemm_ab.tensor.f16f16f32;pocl.abs.f32;pocl.add.i8;org.khronos.openvx.scale_image.nn.u8;org.khronos.openvx.scale_image.bl.u8;org.khronos.openvx.tensor_convert_depth.wrap.u8.f32 Built-in kernels with version pocl.mul.i32 0x402000 (1.2.0) pocl.add.i32 0x402000 (1.2.0) pocl.dnn.conv2d_int8_relu 0x402000 (1.2.0) pocl.sgemm.local.f32 0x402000 (1.2.0) pocl.sgemm.tensor.f16f16f32 0x402000 (1.2.0) pocl.sgemm_ab.tensor.f16f16f32 0x402000 (1.2.0) pocl.abs.f32 0x402000 (1.2.0) pocl.add.i8 0x402000 (1.2.0) org.khronos.openvx.scale_image.nn.u8 0x402000 (1.2.0) org.khronos.openvx.scale_image.bl.u8 0x402000 (1.2.0) org.khronos.openvx.tensor_convert_depth.wrap.u8.f32 0x402000 (1.2.0) Device Extensions cl_khr_byte_addressable_store 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_int64_base_atomics cl_khr_int64_extended_atomics cl_nv_device_attribute_query cl_khr_fp16 cl_khr_fp64 cl_ext_buffer_device_address cl_khr_subgroup_ballot cl_khr_subgroup_shuffle Device Extensions with Version cl_khr_byte_addressable_store 0x400000 (1.0.0) cl_khr_global_int32_base_atomics 0x400000 (1.0.0) cl_khr_global_int32_extended_atomics 0x400000 (1.0.0) cl_khr_local_int32_base_atomics 0x400000 (1.0.0) cl_khr_local_int32_extended_atomics 0x400000 (1.0.0) cl_khr_int64_base_atomics 0x400000 (1.0.0) cl_khr_int64_extended_atomics 0x400000 (1.0.0) cl_nv_device_attribute_query 0x400000 (1.0.0) cl_khr_fp16 0x400000 (1.0.0) cl_khr_fp64 0x400000 (1.0.0) cl_ext_buffer_device_address 0x1000 (0.1.0) cl_khr_subgroup_ballot 0x400000 (1.0.0) cl_khr_subgroup_shuffle 0x400000 (1.0.0) Platform Name Intel(R) OpenCL Number of devices 1 Device Name Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz Device Vendor Intel(R) Corporation Device Vendor ID 0x8086 Device Version OpenCL 3.0 (Build 0) Device Numeric Version 0xc00000 (3.0.0) Driver Version 2024.18.12.0.05_160000 Device OpenCL C Version OpenCL C 3.0 Device OpenCL C all versions OpenCL C 0xc00000 (3.0.0) OpenCL C 0x800000 (2.0.0) OpenCL C 0x402000 (1.2.0) OpenCL C 0x401000 (1.1.0) OpenCL C 0x400000 (1.0.0) Device OpenCL C features __opencl_c_3d_image_writes 0xc00000 (3.0.0) __opencl_c_atomic_order_acq_rel 0xc00000 (3.0.0) __opencl_c_atomic_order_seq_cst 0xc00000 (3.0.0) __opencl_c_atomic_scope_device 0xc00000 (3.0.0) __opencl_c_atomic_scope_all_devices 0xc00000 (3.0.0) __opencl_c_device_enqueue 0xc00000 (3.0.0) __opencl_c_generic_address_space 0xc00000 (3.0.0) __opencl_c_fp64 0xc00000 (3.0.0) __opencl_c_images 0xc00000 (3.0.0) __opencl_c_int64 0xc00000 (3.0.0) __opencl_c_pipes 0xc00000 (3.0.0) __opencl_c_program_scope_global_variables 0xc00000 (3.0.0) __opencl_c_read_write_images 0xc00000 (3.0.0) __opencl_c_subgroups 0xc00000 (3.0.0) __opencl_c_work_group_collective_functions 0xc00000 (3.0.0) Latest comfornace test passed v2023-10-10-00 Device Type CPU Device Profile FULL_PROFILE Device Available Yes Compiler Available Yes Linker Available Yes Max compute units 64 Max clock frequency 2300MHz Device Partition (core) Max number of sub-devices 64 Supported partition types by counts, equally, by names (Intel), by affinity domain Supported affinity domains NUMA, next partitionable Max work item dimensions 3 Max work item sizes 8192x8192x8192 Max work group size 8192 Preferred work group size multiple (device) 128 Preferred work group size multiple (kernel) 128 Max sub-groups per work group 2048 Sub-group sizes (Intel) 4, 8, 16, 32, 64 Preferred / native vector sizes char 1 / 64 short 1 / 32 int 1 / 16 long 1 / 8 half 1 / 32 (cl_khr_fp16) float 1 / 16 double 1 / 8 (cl_khr_fp64) Half-precision Floating-point support (cl_khr_fp16) Denormals No Infinity and NANs Yes Round to nearest Yes Round to zero No Round to infinity No IEEE754-2008 fused multiply-add No Support is emulated in software No Single-precision Floating-point support (core) Denormals Yes Infinity and NANs Yes Round to nearest Yes Round to zero No Round to infinity No IEEE754-2008 fused multiply-add No Support is emulated in software No Correctly-rounded divide and sqrt operations No 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 Address bits 64, Little-Endian Global memory size 404309209088 (376.5GiB) Error Correction support No Max memory allocation 202154604544 (188.3GiB) Unified memory for Host and Device Yes Shared Virtual Memory (SVM) capabilities (core) Coarse-grained buffer sharing Yes Fine-grained buffer sharing Yes Fine-grained system sharing Yes Atomics Yes Minimum alignment for any data type 128 bytes Alignment of base address 1024 bits (128 bytes) Preferred alignment for atomics SVM 64 bytes Global 64 bytes Local 0 bytes Atomic memory capabilities relaxed, acquire/release, sequentially-consistent, work-group scope, device scope, all-devices scope Atomic fence capabilities relaxed, acquire/release, sequentially-consistent, work-item scope, work-group scope, device scope, all-devices scope Max size for global variable 65536 (64KiB) Preferred total size of global vars 65536 (64KiB) Global Memory cache type Read/Write Global Memory cache size 262144 (256KiB) Global Memory cache line size 64 bytes Image support Yes Max number of samplers per kernel 480 Max size for 1D images from buffer 12634662784 pixels Max 1D or 2D image array size 2048 images Base address alignment for 2D image buffers 64 bytes Pitch alignment for 2D image buffers 64 pixels Max 2D image size 16384x16384 pixels Max 3D image size 2048x2048x2048 pixels Max number of read image args 480 Max number of write image args 480 Max number of read/write image args 480 Pipe support Yes Max number of pipe args 16 Max active pipe reservations 4095 Max pipe packet size 1024 Local memory type Global Local memory size 262144 (256KiB) Max number of constant args 480 Max constant buffer size 131072 (128KiB) Generic address space support Yes Max size of kernel argument 3840 (3.75KiB) Queue properties (on host) Out-of-order execution Yes Profiling Yes Local thread execution (Intel) Yes Device enqueue capabilities supported, replaceable default queue Queue properties (on device) Out-of-order execution Yes Profiling Yes Preferred size 4294967295 (4GiB) Max size 4294967295 (4GiB) Max queues on device 4294967295 Max events on device 4294967295 Prefer user sync for interop No Profiling timer resolution 1ns Execution capabilities Run OpenCL kernels Yes Run native kernels Yes Non-uniform work-groups Yes Work-group collective functions Yes Sub-group independent forward progress No IL version SPIR-V_1.0 SPIR-V_1.1 SPIR-V_1.2 SPIR-V_1.3 SPIR-V_1.4 ILs with version SPIR-V 0x400000 (1.0.0) SPIR-V 0x401000 (1.1.0) SPIR-V 0x402000 (1.2.0) SPIR-V 0x403000 (1.3.0) SPIR-V 0x404000 (1.4.0) SPIR versions 1.2 printf() buffer size 1048576 (1024KiB) Built-in kernels (n/a) Built-in kernels with version (n/a) Device Extensions cl_khr_spirv_linkonce_odr cl_khr_fp64 cl_khr_fp16 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_3d_image_writes cl_khr_byte_addressable_store cl_khr_depth_images cl_khr_extended_bit_ops cl_khr_icd cl_khr_il_program cl_khr_suggested_local_work_size cl_intel_unified_shared_memory cl_intel_devicelib_assert cl_khr_subgroup_ballot cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_clustered_reduce cl_intel_subgroups cl_intel_subgroups_char cl_intel_subgroups_short cl_intel_subgroups_long cl_intel_required_subgroup_size cl_intel_spirv_subgroups cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_intel_device_attribute_query cl_intel_exec_by_local_thread cl_intel_vec_len_hint cl_intel_device_partition_by_names cl_khr_spir cl_khr_image2d_from_buffer cl_intel_concurrent_dispatch Device Extensions with Version cl_khr_spirv_linkonce_odr 0x400000 (1.0.0) cl_khr_fp64 0x400000 (1.0.0) cl_khr_fp16 0x400000 (1.0.0) cl_khr_global_int32_base_atomics 0x400000 (1.0.0) cl_khr_global_int32_extended_atomics 0x400000 (1.0.0) cl_khr_local_int32_base_atomics 0x400000 (1.0.0) cl_khr_local_int32_extended_atomics 0x400000 (1.0.0) cl_khr_3d_image_writes 0x400000 (1.0.0) cl_khr_byte_addressable_store 0x400000 (1.0.0) cl_khr_depth_images 0x400000 (1.0.0) cl_khr_extended_bit_ops 0x400000 (1.0.0) cl_khr_icd 0x400000 (1.0.0) cl_khr_il_program 0x400000 (1.0.0) cl_khr_suggested_local_work_size 0x400000 (1.0.0) cl_intel_unified_shared_memory 0x400000 (1.0.0) cl_intel_devicelib_assert 0x400000 (1.0.0) cl_khr_subgroup_ballot 0x400000 (1.0.0) cl_khr_subgroup_shuffle 0x400000 (1.0.0) cl_khr_subgroup_shuffle_relative 0x400000 (1.0.0) cl_khr_subgroup_extended_types 0x400000 (1.0.0) cl_khr_subgroup_non_uniform_arithmetic 0x400000 (1.0.0) cl_khr_subgroup_non_uniform_vote 0x400000 (1.0.0) cl_khr_subgroup_clustered_reduce 0x400000 (1.0.0) cl_intel_subgroups 0x400000 (1.0.0) cl_intel_subgroups_char 0x400000 (1.0.0) cl_intel_subgroups_short 0x400000 (1.0.0) cl_intel_subgroups_long 0x400000 (1.0.0) cl_intel_required_subgroup_size 0x400000 (1.0.0) cl_intel_spirv_subgroups 0x400000 (1.0.0) cl_khr_int64_base_atomics 0x400000 (1.0.0) cl_khr_int64_extended_atomics 0x400000 (1.0.0) cl_intel_device_attribute_query 0x400000 (1.0.0) cl_intel_exec_by_local_thread 0x400000 (1.0.0) cl_intel_vec_len_hint 0x400000 (1.0.0) cl_intel_device_partition_by_names 0x400000 (1.0.0) cl_khr_spir 0x400000 (1.0.0) cl_khr_image2d_from_buffer 0x400000 (1.0.0) cl_intel_concurrent_dispatch 0x400000 (1.0.0) NULL platform behavior clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) Portable Computing Language clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) Success [POCL] clCreateContext(NULL, ...) [default] Success [POCL] clCreateContext(NULL, ...) [other] Success [INTEL] clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) Success (1) Platform Name Portable Computing Language Device Name cpu-cascadelake-Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) Success (1) Platform Name Portable Computing Language Device Name cpu-cascadelake-Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1) Platform Name Portable Computing Language Device Name NVIDIA GeForce RTX 2080 Ti 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) Success (2) Platform Name Portable Computing Language Device Name cpu-cascadelake-Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz Device Name NVIDIA GeForce RTX 2080 Ti ICD loader properties ICD loader Name OpenCL ICD Loader ICD loader Vendor OCL Icd free software ICD loader Version 2.2.14 ICD loader Profile OpenCL 3.0 While this result is quite verbose, we can see that Platform 1 is :code:`Intel(R) OpenCL` and Device 0 is :code:`Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz`. This is the platform and device index we are interested in to best match Gradescope. Therefore, to reproduce the results that Gradescope has, we can execute :code:`PLATFORM_INDEX=1 DEVICE_INDEX=0 make run`.