Add SYCL Support to CalorimeterIslandCluster

GSoC '22 Project - Electromagnetic Cluster Finding on GPUs

SYCL support can be enabled with cmake options: -DUSE_SYCL=ON and specifying a compatible SYCL compiler using -DCMAKE_CXX_COMPILER=<dpcpp>

As of now only Intel OneAPI DPCPP is supported.

eicweb/oneapi_jug_xl:nightly provides a OneAPI environment for running / developing SYCL-enabled code.

More information about the project and the proposal can be found in the student blog here

requested review from @wdconinc

assigned to @AjaxLight

Performance Report on SYCL Code

The following performance studies were done on Compute Canada's HPC Systems on an AMD EPYC 32-core CPU with -O2 flag enabled for both Control (Sequential) and Test (SYCL) code. Simple hotspots collection was performed for both types to determine wall-clock time of execution (includes overhead time). No GPUs were used due to limitations

Few points to note:

• Only OpenCL is currently supported and hence performance gains can only be seen on an AMD GPU. CUDA has experimental support for OneAPI and is currently not supported. Since we don't have access to AMD GPUs for testing the following performance runs were carried out on the same AMD EPYC CPUs. Therefore, we see negligible / worse performance from SYCL Code. Take the following with a grain of salt.
• Testing was carried out with a separate freestanding test build as VTune doesn't work with Gaudi. Test repo here

Report:

1. Grouped Barplot of Wall Time vs Number of Events

2. Screenshots of VTune Hotspots results perf_cmpr.pdf

marked this merge request as ready

added 2 commits

• 08e2552c - 1 commit from branch master
• 5613e4a9 - Add SYCL Support to CalorimeterIslandCluster

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enabled an automatic merge when the pipeline for 5613e4a9 succeeds

merged