Excuse me, is there any mult-core acceleration sup...
# openroady
yifei zhu
05/12/2023, 1:47 PMExcuse me, is there any mult-core acceleration support in Openroad? Openlane has option like ROUTING_CORE to accelerate its routing stage. Does Openroad has such kind of things?
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Matt Liberty
05/13/2023, 2:32 PMOpenlane's ROUTING_CORE is just a variable that enable Openroad's multithreaded router. The feature is in OR and only the enablement is in OL
y
yifei zhu
05/14/2023, 1:35 PMso can I adjust the number of routing core in OR? Or how many cores does OR use by default?
yifei zhu
05/14/2023, 1:41 PMI can’t find any option related to ROUTING_CORE in OpenRoad’s scripts
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Michael Strothjohann
05/14/2023, 4:11 PMIn OpenLane/scripts/openroad/droute.tcl LIne17 : set_thread_count $::env(ROUTING_CORES) the number of threads is set. (see openroad -threads count | max
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yifei zhu
05/15/2023, 4:22 AMyes, i know that’s in Openlane. But I mean I can’t find that option in Openroad. How may cores are OpenRoad using when doing routing?
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Michael Strothjohann
05/15/2023, 12:03 PMThere are several possibilities: (1) openroad -threads count | max sets threads_ (see OpenRoad::setThreadCount(..) in tools/OpenROAD/src/openroad.cc ) Those openroad-tools (i.e. drt = detail rooter) that are interested in this, call getThreadCount() and behave accordingly. (2) OpenROAD-flow-scripts (ORFS): In Makefile:230, NUM_CORES is set to the number of available cores. flow/scripts/detail_root.tcl use this value.
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yifei zhu
05/16/2023, 6:51 AMOK thank you very much
yifei zhu
05/16/2023, 6:59 AMBtw, do you know whether does ORFS support MMMC or such kind of mult-corer mode ?
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Matt Liberty
05/17/2023, 4:15 AMOR suppose MC but we have no exposed it through ORFS. It is possible if it would be useful.
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Michael Strothjohann
05/18/2023, 9:51 AMe.g. OpenSTA (see tools/OpenROAD/src/sta/examples/multi_corner.tcl )
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