Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
This course combines our Allegro PCB Editor Basic Techniques, followed by Allegro PCB Editor Intermediate Techniques.
Virtuoso Analog Design Environment Verifier 16.7
Learn learn to perform requirements-driven analog verification using the Virtuoso ADE Verifier tool.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technlogy. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
Is the terminology of "multithread" (i.e. +mt = x) in APS/IRUN means number of CPU core to use? On a 12 cpu core machines, the max number of "multithread" should be 12, is it right? Thanks
Yes, that's right. The tool won't allow you to use more threads than "cores" that are available. Note that I put "cores" in quotation marks because if you have hyperthreading enabled, that will increase the number available to use - although in general we don't recommend using hyperthreading with APS because you don't typically get good scaling with a heavily floating point application like APS.
In reply to Andrew Beckett:
Is "hyperthreading" a simulator option or machine setup?
How about AMS simulation using IRUN? Since "+mt=x" is APS arguments, if the simulator need also to resolve HDL events, will it need more cores than specified by "+mt=x"? I'm asking this is to correct setup the LSF strings "bsub -n y" to correlate irun +mt=x arguments, otherwise LSF may confuse and causes the farm to be low efficient.
In reply to greatqs:
Hyperthreading is a capability of Intel processors, and it is enabled/disabled as a BIOS setting usually. So it's a machine setup thing.
If you've allocated a certain number of cores when you submitted the job with LSF, you can use +mt=lsf - and then it will inherit the number of threads from the LSF settings.
There's no need to allocate more threads for HDL aspects - it's only the analog solver that is multi-threaded (that includes any analog parts of HDLs too).
For example 4 cores are used by analog solver for multithreading, but digital solver still need extra core for digital HDL, right? Otherwise 4 threads of the analog solver may not be balanced.
No, you don't need to do that. The +mt argument is only used for APS anyway - and the digital HDL is not multi-threaded so will be handled in the "main" thread. Given that the analog solver and digital "solver" are not active at the same time, there's no real benefit in having the digital in a separate thread from the analog (there has to be synchronization between the analog and digital - this is a consequence of how the two worlds are aligned).
Sorry to up this topic.
Just to explain me why, when i want to do an APS simulation with multi threads option, i cannot use the maximum specified.
For example, when I set 6 threads, the message in start of simulation is:
"Multithreading Enabled: 6 threads on system with 8 available processors."
" Waiting for available license for Virtuoso(R) Spectre."
And the simulation doesn't start, I've to change the 6 to 4 and then the simulation start.
But normally I can use 8 no ?
Note that, no simulations are running (even from my colleague) when iḿ doing these tests.
Thanks in advance for your help.
In reply to Chrisss:
APS uses 2 tokens for 1 core, and 4 tokens for 2-4 cores, and 6 tokens for 5-16 cores. If you are doing RF analyses, it will use one more than that.
So whatever is going on, you don't have enough licenses, which is why you're getting this problem. I don't know how many you have free.
If this doesn't makes sense to you, please contact customer support so that we can take a look.
Thanks for your explanations.