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Observer jerome.crocco
Registered: ‎12-12-2017

SDx Build Very Slow



I am starting an evaluation period of SDX for XILINX ZC702 family FPGA.


I am new.  


I am completing some introductory tutorials.   https://www.xilinx.com/html_docs/xilinx2017_2/sdsoc_doc/topics/tutorials/concept-lab-intro-to-sdsoc.html


I Run the initial build Lab1 from this tutorial.  This is very simple matrix multiplication and matrix addition.  I have been sitting here for 15 minutes and it is still only at 25%.  Is this correct?


I am running on a I7 processor, 3GHz, 16GB ram Lattitude E6440.  So reasonable specs.


I am curious for an actual project which will be much larger than this, how the build time will increase. This is not very practical, unless I am missing something important.


Please help.

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7 Replies
Scholar austin
Registered: ‎02-27-2008

Re: SDx Build Very Slow

Slow is relative,


When it comes to creation of the hardware platform, one sees a slowdown to create a bitstream that can do something useful.  The benefit is the resulting logic in the FPGA device is hundreds to thousands of times faster, and hundreds of times less power than processors running software.


Large designs may take all day, using up to eight cores, on really fast x86 machines.  Medium size designs may take a few hours to target c/cpp code segments to be accelerated in hardware.  If nothing is targeted to hardware it completes quite fast.  One remains in software until everything is debugged.  Then, moving modules as required to hardware to meet the needs of the application (for example 60 frames/sec 1080p HD video).



Austin Lesea
Principal Engineer
Xilinx San Jose
Visitor seek64
Registered: ‎10-04-2017

Re: SDx Build Very Slow

Hello Jerome,


yes, as austin has already mentioned, synthesis can take a relatively long time.


A good method to cope with this is to use different build configurations. Personally, I usually use these 3:

  • One for Debugging, which runs solely on CPU (no Hardware Function selected)
  • One for Estimating performance with accelerated functions
  • One for the actual build

The advantage of the first one is, that if you're building the project a second time while having done only minor changes, the build will usually finish really quick (~2 minutes for me), since SDx can skip expensive steps like creating the block diagram. 

The built Project will usually (depending on your application) provide the same functionality, but just be a lot slower.


The second one is a good method for checking, if you're Hardware Functions are working as intended (e.g. verify that the initiation interval of a pipelined loop is adequate). This build configuration is also a lot faster, since it does not neet to create a bitstream. To give you an example: Building my current project takes around 2 hours, while the estimation takes around 10 minutes.


But you will quickly learn how to cope with the build times, it just needs some good time Management. :)



Registered: ‎09-12-2007

Re: SDx Build Very Slow

You can use the emulation to to test your system without generating the bitstream.


Users can also cache the IP in the platform 

set_property dsa.ip_cache_dir [get_property ip_output_repo [current_project]] [current_project]


This should speed up the build alot

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Participant fujiajun
Registered: ‎01-11-2018

Re: SDx Build Very Slow

Hi everyone I want to know how slow will the example build will take? It seems the SDx

is dead down, and I dont know what is going on. Now it has taken 1hour, still 24%, as below. Is it normal or my SDx has problem?


****** vpl v2017.4 (64-bit)
**** SW Build 2086221 on Fri Dec 15 20:55:39 MST 2017
** Copyright 1986-2017 Xilinx, Inc. All Rights Reserved.

INFO: [VPL 60-895] Target platform: D:/Xilinx/SDx/2017.4/platforms/zcu102\zcu102.xpfm
INFO: [VPL 60-423] Target device: zcu102
INFO: [VPL 60-251] Hardware accelerator integration...

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Participant fujiajun
Registered: ‎01-11-2018

Re: SDx Build Very Slow

Sorry about the last question, I found my PC goes in the sleep condtion automaticlly, by correctting the configuration  the build can go smoothly, about 20 minutes.

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Observer cchuvalas
Registered: ‎09-12-2018

Re: SDx Build Very Slow

Are there any improvements on this? I like the approach @seek64 took. Is there more customization to the compile that could be done?

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Visitor albertchung
Registered: ‎05-14-2018

Re: SDx Build Very Slow


The ChaiDNN Ver.1 project take me more than one day to build the SSD example using ver. 2017.4 on win 10 , it only building workspace 15%...



Any Suggestion ?

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