On 21/10/15 19:06, Adrien Prost-Boucle wrote:
Hi all,
I've run simulation speed tests for the 3 different flavors of GHDL
(mcode, llvm, gcc) and for 3 versions of the Xilinx Vivado simulator,
XSim (2015.1, 2015.2, 2015.3).
Launched on a x86_64 GNU/Linux system.
I used various applications generated with an HLS tool. The VHDL code
itself is not the point of interest, only simulation speed is.
Attached is the raw result file.
General trend:
- mcode is 2 times slower than gcc and llvm flavors at simulation, but
it launches immediately, which makes it ideal for small-scale
simulations.
Yes, this is expected, as code generated by mcode is not optimized.
You don't need to optimize all your design, but generating good code
for ieee packages is a must.
- Flavors llvm and gcc present roughly the same perfs.
- Xilinx Vivado simulators are much slower than llvm and gcc flavors of
GHDL. It even seems that the newest version, 2015.3, is a huge
regression compared to version 2015.2.
Thank you for the figures!
Besides, for people who are interested in doing tests:
I run ArchLinux distibution and I prepared packages for the 3 GHDL
flavors. All are built from hg source.
mcode https://aur.archlinux.org/packages/ghdl-mcode-hg/
llvm https://aur.archlinux.org/packages/ghdl-llvm-hg/
gcc https://aur.archlinux.org/packages/ghdl-hg/
Thanks too. Maybe you want to put this in the wiki pages.
Tristan.
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