Re: [openram-dev-group] Problem of spice simulation characterization

[Matthew Guthaus]

Rongmei,

You can debug this by looking at the debug output. This is described on slides 19-26 of the documentation. There are temporary files with the standard output and standard error. It is likely that there was a problem (a license problem?) running your simulator. This would be in the output.

Matt

On Wed, Sep 18, 2019 at 5:50 AM Rongmei CHEN <mei201...@gmail.com> wrote:

Hi Professor,

  I found an error during the characterization using spice simulation instead of analytical calculation. I setup the configuration file and the path to hspice which I believe should be correct. 

  The error massage is as below. Would you tell me what mistakes I made or how to correct?

ERROR: file stimuli.py: line 358: Spice simulation error: /imec/software/synopsys/release2013/hspice_v2013.03-SP1/hspice/bin/hspice -mt 2 -i /tmp/openram_chen51_19830_temp/stim.sp -o /tmp/openram_chen51_19830_temp/timing

Traceback (most recent call last):

  File "/imec/users/chen51/openram/compiler//openram.py", line 76, in <module>

    s.save()

  File "/imec/users/chen51/openram/compiler/sram.py", line 112, in save

    lib(out_dir=OPTS.output_path, sram=self.s, sp_file=sp_file)

  File "/imec/users/chen51/openram/compiler/characterizer/lib.py", line 34, in __init__

    self.characterize_corners()

  File "/imec/users/chen51/openram/compiler/characterizer/lib.py", line 94, in characterize_corners

    self.characterize()

  File "/imec/users/chen51/openram/compiler/characterizer/lib.py", line 101, in characterize

    self.compute_delay()

  File "/imec/users/chen51/openram/compiler/characterizer/lib.py", line 501, in compute_delay

    char_results = self.d.analyze(probe_address, probe_data, self.slews, self.loads)

  File "/imec/users/chen51/openram/compiler/characterizer/delay.py", line 742, in analyze

    feasible_delays = self.find_feasible_period()

  File "/imec/users/chen51/openram/compiler/characterizer/delay.py", line 442, in find_feasible_period

    feasible_delays[self.read_ports[0]] = self.find_feasible_period_one_port(self.read_ports[0])

  File "/imec/users/chen51/openram/compiler/characterizer/delay.py", line 410, in find_feasible_period_one_port

    (success, results)=self.run_delay_simulation()

  File "/imec/users/chen51/openram/compiler/characterizer/delay.py", line 476, in run_delay_simulation

    self.stim.run_sim()

  File "/imec/users/chen51/openram/compiler/characterizer/stimuli.py", line 358, in run_sim

    debug.error("Spice simulation error: " + cmd, -1)

  File "/imec/users/chen51/openram/compiler/debug.py", line 40, in error

    assert return_value == 0

AssertionError

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Matthew Guthaus

Associate Dean of Graduate Studies

Professor, Computer Science & Engineering

Baskin School of Engineering

University of California Santa Cruz

https://www.soe.ucsc.edu/people/mrg

[Rongmei CHEN]

Hi Professor,

  Indeed. I solved the hspice license problem and the hspice characterization is running. However, it is pretty slow. One case study of 128*16 has taken up to 5 hours but not finished yet.

Best,

Rongmei

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[Matthew Guthaus]

Yeah, characterizing is slow!

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