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===========
Performance
===========
The SPMD programming model that ``ispc`` provides makes it easy to harness the
computational power available in SIMD vector units on modern CPUs, while
its basis in C makes it easy for programmers to adopt and use
productively. This page summarizes the performance of ``ispc`` with the
workloads in the ``examples/`` directory of the ``ispc`` distribution.
These results were measured on a 4-core Apple iMac with a 4-core 3.4GHz
Intel® Core-i7 processor using the Intel® AVX instruction set. The basis
for comparison is a reference C++ implementation compiled with gcc 4.2.1,
the version distributed with OS X 10.7.2. (The reference implementation is
also included in the ``examples/`` directory.)
.. list-table:: Performance of ``ispc`` with a variety of the workloads
from the ``examples/`` directory of the ``ispc`` distribution, compared to
a reference C++ implementation compiled with gcc 4.2.1.
* - Workload
- ``ispc``, 1 core
- ``ispc``, 4 cores
* - `AOBench`_ (512 x 512 resolution)
- 6.19x
- 28.06x
* - `Binomial Options`_ (128k options)
- 7.94x
- 33.43x
* - `Black-Scholes Options`_ (128k options)
- 8.45x
- 32.48x
* - `Deferred Shading`_ (1280p)
- 5.02x
- 23.06x
* - `Mandelbrot Set`_
- 6.21x
- 20.28x
* - `Perlin Noise Function`_
- 5.37x
- n/a
* - `Ray Tracer`_ (Sponza dataset)
- 4.31x
- 20.29x
* - `3D Stencil`_
- 4.05x
- 15.53x
* - `Volume Rendering`_
- 3.60x
- 17.53x
.. _AOBench: https://github.com/ispc/ispc/tree/main/examples/cpu/aobench
.. _Binomial Options: https://github.com/ispc/ispc/tree/main/examples/cpu/options
.. _Black-Scholes Options: https://github.com/ispc/ispc/tree/main/examples/cpu/options
.. _Deferred Shading: https://github.com/ispc/ispc/tree/main/examples/cpu/deferred
.. _Mandelbrot Set: https://github.com/ispc/ispc/tree/main/examples/cpu/mandelbrot_tasks
.. _Ray Tracer: https://github.com/ispc/ispc/tree/main/examples/cpu/rt
.. _Perlin Noise Function: https://github.com/ispc/ispc/tree/main/examples/cpu/noise
.. _3D Stencil: https://github.com/ispc/ispc/tree/main/examples/cpu/stencil
.. _Volume Rendering: https://github.com/ispc/ispc/tree/main/examples/cpu/volume_rendering
The following table shows speedups for a number of the examples on a
2.40GHz, 40-core Intel® Xeon E7-8870 system with the Intel® SSE4
instruction set, running Microsoft Windows Server 2008 Enterprise. Here,
the serial C/C++ baseline code was compiled with MSVC 2010.
.. list-table:: Performance of ``ispc`` with a variety of the workloads
from the ``examples/`` directory of the ``ispc`` distribution, on
system with 40 CPU cores.
* - Workload
- ``ispc``, 40 cores
* - AOBench (2048 x 2048 resolution)
- 182.36x
* - Binomial Options (2m options)
- 63.85x
* - Black-Scholes Options (2m options)
- 83.97x
* - Ray Tracer (Sponza dataset)
- 195.67x
* - Volume Rendering
- 243.18x
Notices & Disclaimers
=====================
Performance varies by use, configuration and other factors. Learn more at
www.intel.com/PerformanceIndex.
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