has anyone had the openlane flow fail at this step...
# openlanea
aryap
10/23/2020, 9:13 PMhas anyone had the openlane flow fail at this step?
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16. Executing ABC pass (technology mapping using ABC).
16.1. Extracting gate netlist of module `\mac_cluster' to `/tmp/yosys-abc-ScuQlb/input.blif'..
Extracted 11382 gates and 11705 wires to a netlist network with 323 inputs and 384 outputs.
16.1.1. Executing ABC.
ERROR: Can't open ABC output file `/tmp/yosys-abc-ScuQlb/output.blif'.aryap
10/24/2020, 1:23 AMah, nevermind. in the yosys.log i found this:
aryap
10/24/2020, 1:23 AM Copy code
983 ABC: Error: The network is combinational.
984 ABC: + map -p -B 0.2 -A 0.9 -M 0
985 ABC: The cell areas are multiplied by the factor: <num_fanins> ^ (0.90).
986 ABC: The cell delays are multiplied by the factor: <num_fanins> ^ (0.20).
987 ABC: + retime -D -D 30000
988 ABC: + buffer -N 5 -S 3000.0
989 ABC: ** cmd error: aborting 'source /tmp/yosys-abc-uhjRHz/abc.script'
990 ABC: node 9893 has no fanout
991 ABC: Error: The command has failed.aryap
10/24/2020, 8:09 PMthis might have had something to do with low-ish disk space on my PC, though none of the errors suggest as much
aryap
10/24/2020, 8:10 PMi get the same error now on another machine with no space issues
aryap
10/24/2020, 8:22 PMok. i don't think it's space related. it's definitely flakiness. sometimes it works, sometimes it doesn't.
aryap
10/24/2020, 8:39 PMhere's the outputs of two runs with the same config, one working, one not. diff of the yosys.log. not clear why there's a divergence
aryap
10/24/2020, 8:45 PMOOOOH is the difference the synth strategy?
aryap
10/24/2020, 8:48 PMomg i think that's it
aryap
10/24/2020, 8:59 PMalso, confusingly, i don't think SYNTH_STRATEGY was getting reset unless i did ./clean_runs.tcl
a
Ahmed Ghazy
10/25/2020, 8:05 PMYou were probably using the same run tag over and over without -overwrite?
a
aryap
10/26/2020, 4:41 AMyeah - i didn't think i needed it because it blows away all the old results in most of the subdirs that i've seen
aryap
10/26/2020, 4:42 AMin any case the only real takeaway here is that abc failing with such an obtuse error might be better furnished with a warning to try a different strategy
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