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Make FGP opt-in #28

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Sep 27, 2022
Merged

Make FGP opt-in #28

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4 changes: 2 additions & 2 deletions sim/vcs/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,7 @@ def run_vcs(self) -> bool:
"-debug_access+all" # since I-2014.03, req'd for FSDB dumping & force regs
]

if self.version() >= self.version_number("M-2017.03"):
if self.get_setting("sim.vcs.fgp") and self.version() >= self.version_number("M-2017.03"):
args.append("-fgp")

if timescale is not None:
Expand Down Expand Up @@ -329,7 +329,7 @@ def run_simulation(self) -> bool:
# setup simulation arguments
args = [ self.simulator_executable_path ]
args.extend(exec_flags_prepend)
if self.version() >= self.version_number("M-2017.03"):
if self.get_setting("sim.vcs.fgp") and self.version() >= self.version_number("M-2017.03"):
# num_threads is in addition to a master thread, so reduce by 1
num_threads=int(self.get_setting("vlsi.core.max_threads")) - 1
args.append("-fgp=num_threads:{threads},num_fsdb_threads:0,allow_less_cores,dynamictoggle".format(threads=max(num_threads,1)))
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5 changes: 5 additions & 0 deletions sim/vcs/defaults.yml
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Expand Up @@ -12,3 +12,8 @@ sim.vcs:
# VCS version to use.
# Used to locate the binary - e.g. the 'M-2017.03' in ${synopsys.synopsys_home}/vcs/M-2017.03/bin/vcs
version: "P-2019.06-SP2-5"

# Option to turn on Fine-Grained Parallelism (FGP)
# Not all designs benefit from parallelized simulation.
# Use at your own risk - it is known to be buggy!
fgp: false