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fpga: tools: Make each BUILD_SEED random

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Use --seed only to initialize a local deterministic random number
generator. Generate a new signed 32-bit BUILD_SEED for each FPGA build
attempt instead of passing --seed directly to the first build. This
avoids accidentally using sequential pipeline attempt numbers as
BUILD_SEED values.

Using the same --seed produces the same BUILD_SEED sequence, preserving
reproducibility.
This commit is contained in:
Wade Fife 2026-09-02 14:53:13 -05:00
parent 15283f106b
commit ddb7e6866b
1 changed files with 7 additions and 18 deletions
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25
fpga/usrp3/tools/utils/repeat_fpga_build.py
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@ -240,7 +240,10 @@ def parse_args():
type=int,
default=0,
required=False,
help="Initial seed value to use.",
help=(
"Seed for the random number generator used to generate "
"the random BUILD_SEED value for each FPGA build attempt."
),
)
parser.add_argument(
"--fpga-jobs",
@ -492,21 +495,6 @@ def run_ip_build(
return Status.SUCCESS
def next_build_seed(previous_seed):
"""Determines the next seed to use based on the previous seed. This creates
a reproducible sequence of values with a specific initial value.
Args:
previous_seed: The previous integer seed from which to determine the
new seed.
Returns:
The next build seed value in the range of a 32-bit signed integer.
"""
random.seed(previous_seed)
return random.randint(-0x80000000, 0x7FFFFFFF)
def main():
"""Run the requested builds.
@ -520,7 +508,7 @@ def main():
if not args.target and not args.image_core:
logging.error("Either --target or --image-core must be provided!")
return Status.NONE.value
build_seed = args.seed
build_seed_rng = random.Random(args.seed)
workers = Workers()
if args.fpga_jobs > 1 and not args.image_core_name:
@ -556,6 +544,8 @@ def main():
):
worker_num = workers.new()
build_num = worker_num + args.index
# Generate a random 32-bit signed BUILD_SEED for each build
build_seed = build_seed_rng.randint(-0x80000000, 0x7FFFFFFF)
thread = threading.Thread(
target=run_fpga_build,
args=(
@ -576,7 +566,6 @@ def main():
)
workers.set(worker_num, thread=thread, start_time=time.time())
thread.start()
build_seed = next_build_seed(build_seed)
else:
# We've maxed out the number of workers/jobs, so check the
# status periodically.