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IPC Workflow Question

TF202506034656

Good evening,

I'm creating a workflow that follows this structure:


Various simulations -> IPC Process -> Run python post processing / metrics -> Transfer python output back to cadence.

I've got this working pretty steadily by creating a child process for the python script, and reading it back to the parent. But, I've hard to perform quite a few "hacky" solutions, such as creating/reading large CSV files both on the cadence side, as well as the python side, passing markers etc. I'm wondering if there's any sort of precedence for this. From what I've understood in the documentation, IPC processes come with a stdout buffer of 4096B. This was my initial idea, but most of my data is in the tens of thousands of lines, and transferring in packets through this buffer seems eerie. 

Is there a solid method for transferring large amounts of data between the parent and child processes, without relying on a variety of waveformToCSV and CSVtoWaveform helpers, as well as blocking thread use while pythons operating?

Thanks, 
Trevor Farias

  • Trevor,

    In general, sending large amounts of data via the IPC mechanism is not recommended - it is really not designed with that in mind. Instead, it's better to store data to be transferred in files, and just send the messages across to reference those files.

    One thing that would help is to use the cdspythonsrr kit that is shipped in Virtuoso since IC23.1 ISR12 - see What’s New in Virtuoso IC23.1 ISR12. Previously we had a standalone kit that had to be requested specially, but now we ship a form of it with the software. This allows you to directly read simulation results from Spectre in Python, so that might cut out some of the file transfers you currently need?

    Regards,

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    Thank you for the reply, that is kind of what I figured would be the case. I'll give cdpythonsrr kit a lookover.

    Thanks for the quick reply, your community forums contributions have been incredibly helpful. I think there's some comedic irony with people posting AI-generated content, as you're probably the material ChatGPT has learned SKILL from! 

    Thanks,

    Trevor

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