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Re: [Iverilog-devel] What is the simulation speed ratio between Icarus and comercial software?
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From: Uwe B. <bo...@el...> - 2009-04-29 18:26:30
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>>>>> "Cary" == Cary R <cy...@ya...> writes:
Cary> --- On Wed, 4/29/09, XINGZHI WEN <xin...@ho...> wrote:
>> I started using Icarus from last week, but I noticed it is slower
>> than Cadence ncverilog.
>>
>> I understand that it is unfair to compare Icarus Vs. Cadence
>> ncverilog, considering the number of developers behind them, but I
>> would like to know what is the average speed ratio. In my test it is
>> about 50, 80 minutes in Icarus, but 90 seconds ncverilog.
>>
>> Is this a normal speed I should expect from Icarus?
>>
>> If this is a normal speed, do you have explanation, what makes
>> slowing down Icarus? Is there any option/switch that can speed up
>> Icarus?
Cary> Yes Icarus is slow. It works well for RTL simulation, but for gate
Cary> level simulations it can be too limiting. Add to this the fact
Cary> that it does not fully support all SDF delays and that timing
Cary> checks are missing means I would not recommend Icarus for gate
Cary> level simulations. I personally get a short term license for a
Cary> commercial tool to do final gate level simulations, but all my RTL
Cary> design is done with Icarus.
Cary> There is no switch to make Icarus faster. At some point in time we
Cary> probably need to look at this again. Steve did some work last year
Cary> that made Icarus noticeably faster, but to get the order of
Cary> magnitude improvement we need for reasonable gate level
Cary> simulations will likely require a significant restructuring of the
Cary> run time/event processing. There is much learning that needs to
Cary> happen before we can tackle this problem.
Compiling with ICC migth also be an option to try...
--
Uwe Bonnes bo...@el...
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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