Intel^® VTune^™ Profiler 2022.0.0

Elapsed Time: 84.143s

CPU Time: 5175.867s
- Effective Time: 5175.802s
- Spin Time: 0.025s
  - Imbalance or Serial Spinning: 0.005s
  - Lock Contention: 0.010s
  - Other: 0.010s
- Overhead Time: 0.040s
  - Creation: 0.025s
  - Scheduling: 0.015s
  - Reduction: 0s
  - Atomics: 0s
  - Other: 0s

Instructions Retired: 496,260,000,000

Microarchitecture Usage: 2.4% of Pipeline Slots

You code efficiency on this platform is too low.

Possible cause: memory stalls, instruction starvation, branch misprediction or long latency instructions.

Next steps: Run Microarchitecture Exploration analysis to identify the cause of the low microarchitecture usage efficiency.

CPI Rate: 20.780

The CPI may be too high. This could be caused by issues such as memory stalls, instruction starvation, branch misprediction or long latency instructions. Explore the other hardware-related metrics to identify what is causing high CPI.

Total Thread Count: 64

Paused Time: 0s

Top Hotspots:

Function	Module	CPU Time	% of CPU Time(%)
mm_kernel(cl::sycl::queue&, std::vector<float, std::allocator<float>>&, std::vector<float, std::allocator<float>>&, std::vector<float, std::allocator<float>>&, unsigned long, unsigned long)::{lambda(cl::sycl::handler&)#1}::operator()(cl::sycl::handler&) const::{lambda(cl::sycl::nd_item<(int)2>)#1}	d621b7e0a2c35e56	5058.146s	97.7%
[Outside any known module]	[Unknown]	105.166s	2.0%
Intel::OpenCL::Utils::AtomicCounter::operator long	libcpu_device.so.2021.13.11.0	5.147s	0.1%
Intel::OpenCL::CPUDevice::AffinitizeThreads::ExecuteIteration	libcpu_device.so.2021.13.11.0	2.681s	0.1%
Intel::OpenCL::Utils::OclNonReentrantSpinMutex::Lock	libcpu_device.so.2021.13.11.0	2.671s	0.1%
[Others]	N/A	2.055s	0.0%

Top Tasks:
Task Type Task Time Task Count Average Task Time
tbb_parallel_for 5225.356s 130 40.195s
tbb_custom 81.931s 11 7.448s

Task Type	Task Time	Task Count	Average Task Time
tbb_parallel_for	5225.356s	130	40.195s
tbb_custom	81.931s	11	7.448s

Effective Physical Core Utilization: 96.2% (30.784 out of 32)
- Effective Logical Core Utilization: 96.1% (61.512 out of 64)

Collection and Platform Info:
- Application Command Line: /home/u49991/DPCPP_Performance_Portability/lab/mm_dpcpp_ndrange "-n" "10240" "-m" "64"
- Operating System: 4.15.0-151-generic DISTRIB_ID=Ubuntu DISTRIB_RELEASE=18.04 DISTRIB_CODENAME=bionic DISTRIB_DESCRIPTION="Ubuntu 18.04.6 LTS"
- Computer Name: s001-n145
- Result Size: 385.7 MB
- Collection start time: 14:42:16 13/01/2022 UTC
- Collection stop time: 14:43:40 13/01/2022 UTC
- Collector Type: Driverless Perf system-wide sampling
- CPU:
  - Name: Intel(R) Xeon(R) Processor code named Skylake
  - Frequency: 1.995 GHz
  - Logical CPU Count: 64
  - Cache Allocation Technology:
    Level 2 capability: not detected
    Level 3 capability: available