| # [INFO GPL-0075] Routability numCall: 1 inflationIterCnt: 1 bloatIterCnt: 0 |
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| Tool: Global Routing |
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| Subcategory: Stuck in routine |
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| ## Conversation |
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| ### oharboe |
| So I thought my run was almost finished, it went fairly quickly for a while, but then it got stuck in "Routeability" below.
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| 5 minutes until it got to the GPL-0075 progress message, then stuck there for at least 30 minutes.
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| What does this mean and what can I do about it?
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| The floorplan in my case looks quite reasonable and generous.
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| https://github.com/The-OpenROAD-Project/OpenROAD/blob/580bd35a8b17f0ea7ff8afafb6cf6d23b757063e/src/gpl/src/routeBase.cpp#L557
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| ```
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| [NesterovSolve] Iter: 370 overflow: 0.254754 HPWL: 19171375971
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| [NesterovSolve] Iter: 380 overflow: 0.250836 HPWL: 18915207500
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| [NesterovSolve] Iter: 390 overflow: 0.225598 HPWL: 18784146027
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| [NesterovSolve] Iter: 400 overflow: 0.201047 HPWL: 18784861983
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| [INFO GPL-0075] Routability numCall: 1 inflationIterCnt: 1 bloatIterCnt: 0
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| ```
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| ### oharboe |
| A little bit of suspend/resume profiling using latest OpenROAD and release build...
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| Hmmm... curious. I don't think this is a performance problem, but there were a lot of exceptions thrown, so I had to turn off breakpoints on exceptions.
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| ```
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| __cxa_throw (@__cxa_throw:3)
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| sta::DmpAlg::findDriverParams(double) (.cold) (@sta::DmpAlg::findDriverParams(double) (.cold):14)
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| sta::DmpPi::gateDelaySlew(double&, double&) (.cold) (@sta::DmpPi::gateDelaySlew(double&, double&) (.cold):50)
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| sta::DmpCeffDelayCalc::gateDelay(sta::LibertyCell const*, sta::TimingArc const*, float const&, float, sta::Parasitic const*, float, sta::Pvt const*, sta::DcalcAnalysisPt const*, float&, float&) (@sta::DmpCeffDelayCalc::gateDelay(sta::LibertyCell const*, sta::TimingArc const*, float const&, float, sta::Parasitic const*, float, sta::Pvt const*, sta::DcalcAnalysisPt const*, float&, float&):88)
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| sta::GraphDelayCalc1::findArcDelay(sta::LibertyCell*, sta::Pin const*, sta::Vertex*, sta::MultiDrvrNet*, sta::TimingArc*, sta::Parasitic*, float, sta::Vertex*, sta::Edge*, sta::Pvt const*, sta::DcalcAnalysisPt const*, sta::ArcDelayCalc*) (@sta::GraphDelayCalc1::findArcDelay(sta::LibertyCell*, sta::Pin const*, sta::Vertex*, sta::MultiDrvrNet*, sta::TimingArc*, sta::Parasitic*, float, sta::Vertex*, sta::Edge*, sta::Pvt const*, sta::DcalcAnalysisPt const*, sta::ArcDelayCalc*):112)
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| sta::GraphDelayCalc1::findDriverEdgeDelays(sta::LibertyCell*, sta::Instance*, sta::Pin const*, sta::Vertex*, sta::MultiDrvrNet*, sta::Edge*, sta::ArcDelayCalc*) (@sta::GraphDelayCalc1::findDriverEdgeDelays(sta::LibertyCell*, sta::Instance*, sta::Pin const*, sta::Vertex*, sta::MultiDrvrNet*, sta::Edge*, sta::ArcDelayCalc*):105)
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| sta::GraphDelayCalc1::findDriverDelays1(sta::Vertex*, bool, sta::MultiDrvrNet*, sta::ArcDelayCalc*) (@sta::GraphDelayCalc1::findDriverDelays1(sta::Vertex*, bool, sta::MultiDrvrNet*, sta::ArcDelayCalc*):108)
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| sta::GraphDelayCalc1::findDriverDelays(sta::Vertex*, sta::ArcDelayCalc*) (@sta::GraphDelayCalc1::findDriverDelays(sta::Vertex*, sta::ArcDelayCalc*):63)
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| sta::FindVertexDelays::visit(sta::Vertex*) (@sta::FindVertexDelays::visit(sta::Vertex*):74)
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| sta::BfsIterator::visit(int, sta::VertexVisitor*) (@sta::BfsIterator::visit(int, sta::VertexVisitor*):71)
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| sta::GraphDelayCalc1::findDelays(int) (@sta::GraphDelayCalc1::findDelays(int):47)
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| sta::Sta::checkSlewLimitPreamble() (@sta::Sta::checkSlewLimitPreamble():82)
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| rsz::RepairDesign::repairDesign(double, double, double, int&, int&, int&, int&, int&) (@rsz::RepairDesign::repairDesign(double, double, double, int&, int&, int&, int&, int&):65)
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| rsz::Resizer::findResizeSlacks() (@rsz::Resizer::findResizeSlacks():24)
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| gpl::TimingBase::updateGNetWeights(float) (@gpl::TimingBase::updateGNetWeights(float):18)
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| gpl::NesterovPlace::doNesterovPlace(int) (@gpl::NesterovPlace::doNesterovPlace(int):1262)
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| _wrap_replace_nesterov_place_cmd (@_wrap_replace_nesterov_place_cmd:20)
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| TclNRRunCallbacks (@TclNRRunCallbacks:37)
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| ___lldb_unnamed_symbol1504 (@___lldb_unnamed_symbol1504:315)
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| Tcl_EvalEx (@Tcl_EvalEx:9)
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| ```
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| Ooops.... from within the debugger(attaching) to the release build, I ran into an recursive loop below and a SEGFAULT.
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| Curiously, this infinite stack recursion does not appear with the debug build, which makes for an interesting debug exercise...
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| ```
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| rsz::RepairDesign::repairNetJunc(std::shared_ptr<rsz::BufferedNet>, int, int&, sta::Vector<sta::Pin const*>&) (@rsz::RepairDesign::repairNetJunc(std::shared_ptr<rsz::BufferedNet>, int, int&, sta::Vector<sta::Pin const*>&):16)
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| rsz::RepairDesign::repairNet(std::shared_ptr<rsz::BufferedNet>, int, int&, sta::Vector<sta::Pin const*>&) (@rsz::RepairDesign::repairNet(std::shared_ptr<rsz::BufferedNet>, int, int&, sta::Vector<sta::Pin const*>&):82)
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| [deleted 100s if not 1000s of these]
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| (@rsz::RepairDesign::repairNet(std::shared_ptr<rsz::BufferedNet>, sta::Pin const*, float, int, sta::Corner const*):29)
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| rsz::RepairDesign::repairNet(sta::Net*, sta::Pin const*, sta::Vertex*, bool, bool, bool, int, bool, int&, int&, int&, int&, int&) (@rsz::RepairDesign::repairNet(sta::Net*, sta::Pin const*, sta::Vertex*, bool, bool, bool, int, bool, int&, int&, int&, int&, int&):356)
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| rsz::RepairDesign::repairDesign(double, double, double, int&, int&, int&, int&, int&) (@rsz::RepairDesign::repairDesign(double, double, double, int&, int&, int&, int&, int&):195)
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| rsz::Resizer::findResizeSlacks() (@rsz::Resizer::findResizeSlacks():24)
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| gpl::TimingBase::updateGNetWeights(float) (@gpl::TimingBase::updateGNetWeights(float):18)
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| gpl::NesterovPlace::doNesterovPlace(int) (@gpl::NesterovPlace::doNesterovPlace(int):1262)
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| _wrap_replace_nesterov_place_cmd (@_wrap_replace_nesterov_place_cmd:20)
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| TclNRRunCallbacks (@TclNRRunCallbacks:37)
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| ___lldb_unnamed_symbol1504 (@___lldb_unnamed_symbol1504:315)
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| Tcl_EvalEx (@Tcl_EvalEx:9)
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| Tcl_Eval (@Tcl_Eval:11)
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| sta::sourceTclFile(char const*, bool, bool, Tcl_Interp*) (@sta::sourceTclFile(char const*, bool, bool, Tcl_Interp*):31)
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| ord::tclAppInit(Tcl_Interp*) (@ord::tclAppInit(Tcl_Interp*):128)
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| Tcl_MainEx (@Tcl_MainEx:111)
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| main (@main:742)
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| __libc_start_call_main (@__libc_start_call_main:29)
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| __libc_start_main_impl (@__libc_start_main@@GLIBC_2.34:43)
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| _start (@_start:15)
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| ```
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| ### oharboe |
| Letting it run for a while, debug is MUCH slower than release, I see when I suspend in the debugger. There are 200000 nets to process in gen_brk_RSMT(), coeffADJ() is going through double loops for a total of 10000000 iterations...
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| ```
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| grt::FastRouteCore::getEdgeCapacity(grt::FrNet*, int, int, grt::EdgeDirection) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/fastroute/src/FastRoute.cpp:592)
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| grt::FastRouteCore::coeffADJ(int) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/fastroute/src/RSMT.cpp:616)
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| grt::FastRouteCore::gen_brk_RSMT(bool, bool, bool, bool, bool) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/fastroute/src/RSMT.cpp:662)
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| grt::FastRouteCore::run() (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/fastroute/src/FastRoute.cpp:766)
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| grt::GlobalRouter::findRouting(std::vector<grt::Net*, std::allocator<grt::Net*>>&, int, int) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/GlobalRouter.cpp:397)
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| grt::GlobalRouter::globalRoute(bool) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/grt/src/GlobalRouter.cpp:285)
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| gpl::RouteBase::getGlobalRouterResult() (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/gpl/src/routeBase.cpp:378)
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| gpl::RouteBase::routability() (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/gpl/src/routeBase.cpp:566)
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| gpl::NesterovPlace::doNesterovPlace(int) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/gpl/src/nesterovPlace.cpp:699)
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| gpl::Replace::doNesterovPlace(int) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/gpl/src/replace.cpp:343)
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| replace_nesterov_place_cmd() (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/build/src/gpl/CMakeFiles/gpl.dir/replaceTCL_wrap.cxx:1740)
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| ::_wrap_replace_nesterov_place_cmd(ClientData, Tcl_Interp *, int, Tcl_Obj *const *) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/build/src/gpl/CMakeFiles/gpl.dir/replaceTCL_wrap.cxx:2190)
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| TclNRRunCallbacks (@TclNRRunCallbacks:37)
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| ___lldb_unnamed_symbol1504 (@___lldb_unnamed_symbol1504:315)
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| Tcl_EvalEx (@Tcl_EvalEx:9)
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| Tcl_Eval (@Tcl_Eval:11)
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| sta::sourceTclFile(char const*, bool, bool, Tcl_Interp*) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/sta/app/StaMain.cc:95)
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| ::tclAppInit(int &, char **, const char *, Tcl_Interp *) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/Main.cc:412)
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| ord::tclAppInit(Tcl_Interp*) (/home/oyvind/ascenium/OpenROAD-flow-scripts/tools/OpenROAD/src/Main.cc:440)
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| Tcl_MainEx (@Tcl_MainEx:111)
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| ```
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| ### maliberty |
| You could try disabling each of these in turn to localize the cause
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| ```
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| if {$::env(GPL_ROUTABILITY_DRIVEN)} {
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| append global_placement_args " -routability_driven"
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| }
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| if {$::env(GPL_TIMING_DRIVEN)} {
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| append global_placement_args " -timing_driven"
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| }
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| ```
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| The stacks in rsz/sta are related to timing_driven. If you see a stack in grt that is related to routability_driven. |
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