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author | Arjen Roodselaar <arjen@oxide.computer> | 2022-12-20 11:15:06 -0800 |
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committer | Arjen Roodselaar <arjen@oxide.computer> | 2022-12-20 11:15:06 -0800 |
commit | 923458a2c90ee295cf6502a83ca6182d1d281f48 (patch) | |
tree | b6c8664d974c40a6e4dc00a36eec8d51fe64f6fa /common | |
parent | d5299f144f0dc8cdcca9195d8ffbbd5a77cff77e (diff) | |
download | nextpnr-923458a2c90ee295cf6502a83ca6182d1d281f48.tar.gz nextpnr-923458a2c90ee295cf6502a83ca6182d1d281f48.tar.bz2 nextpnr-923458a2c90ee295cf6502a83ca6182d1d281f48.zip |
Allow setting cell placement timeout
Diffstat (limited to 'common')
-rw-r--r-- | common/kernel/command.cc | 8 | ||||
-rw-r--r-- | common/place/placer_heap.cc | 19 | ||||
-rw-r--r-- | common/place/placer_heap.h | 2 |
3 files changed, 16 insertions, 13 deletions
diff --git a/common/kernel/command.cc b/common/kernel/command.cc index 22000299..6d2dc939 100644 --- a/common/kernel/command.cc +++ b/common/kernel/command.cc @@ -189,7 +189,8 @@ po::options_description CommandHandler::getGeneralOptions() general.add_options()("placer-heap-critexp", po::value<int>(), "placer heap criticality exponent (int, default: 2)"); general.add_options()("placer-heap-timingweight", po::value<int>(), "placer heap timing weight (int, default: 10)"); - general.add_options()("no-placer-timeout", "allow the placer to attempt placement without timeout"); + general.add_options()("placer-heap-cell-placement-timeout", po::value<int>(), + "allow placer to attempt up to the given number of iterations to place the cell (int, default: design size^2 / 8, 0 for no timeout)"); #if !defined(__wasm) general.add_options()("parallel-refine", "use new experimental parallelised engine for placement refinement"); @@ -329,8 +330,9 @@ void CommandHandler::setupContext(Context *ctx) if (vm.count("placer-heap-timingweight")) ctx->settings[ctx->id("placerHeap/timingWeight")] = std::to_string(vm["placer-heap-timingweight"].as<int>()); - if (vm.count("no-placer-timeout")) - ctx->settings[ctx->id("placerHeap/noTimeout")] = true; + if (vm.count("placer-heap-cell-placement-timeout")) + ctx->settings[ctx->id("placerHeap/cellPlacementTimeout")] = + std::to_string(std::max(0, vm["placer-heap-cell-placement-timeout"].as<int>())); if (vm.count("parallel-refine")) ctx->settings[ctx->id("placerHeap/parallelRefine")] = true; diff --git a/common/place/placer_heap.cc b/common/place/placer_heap.cc index 69edd325..ae04118b 100644 --- a/common/place/placer_heap.cc +++ b/common/place/placer_heap.cc @@ -218,7 +218,10 @@ class HeAPPlacer heap_runs.push_back(all_buckets); // The main HeAP placer loop - log_info("Running main analytical placer.\n"); + if (cfg.cell_placement_timeout > 0) + log_info("Running main analytical placer, max placement attempts per cell = %d.\n", cfg.cell_placement_timeout); + else + log_info("Running main analytical placer.\n"); while (stalled < 5 && (solved_hpwl <= legal_hpwl * 0.8)) { // Alternate between particular bel types and all bels for (auto &run : heap_runs) { @@ -828,11 +831,6 @@ class HeAPPlacer // Strict placement legalisation, performed after the initial HeAP spreading void legalise_placement_strict(bool require_validity = false) { - int placement_timeout = cfg.no_placement_timeout ? 0 : - // Set a conservative timeout. This is a rather large number and could probably be - // shaved down, but for now it will keep the process from running indefinite. - std::max(10000, (int(ctx->cells.size()) * int(ctx->cells.size()) / 8) + 1); - auto startt = std::chrono::high_resolution_clock::now(); // Unbind all cells placed in this solution @@ -884,8 +882,8 @@ class HeAPPlacer } while (!placed) { - if (placement_timeout > 0 && total_iters_for_cell > placement_timeout) - log_error("Unable to find legal placement for cell '%s' after %d attempts, check constraints and utilisation.\n", + if (cfg.cell_placement_timeout > 0 && total_iters_for_cell > cfg.cell_placement_timeout) + log_error("Unable to find legal placement for cell '%s' after %d attempts, check constraints and utilisation. Use `--placer-heap-cell-placement-timeout` to change the number of attempts.\n", ctx->nameOf(ci), total_iters_for_cell); // Determine a search radius around the solver location (which increases over time) that is clamped to @@ -1819,7 +1817,10 @@ PlacerHeapCfg::PlacerHeapCfg(Context *ctx) timing_driven = ctx->setting<bool>("timing_driven"); solverTolerance = 1e-5; placeAllAtOnce = false; - no_placement_timeout = ctx->setting<bool>("placerHeap/noTimeout", false); + cell_placement_timeout = ctx->setting<int>("placerHeap/cellPlacementTimeout", + // Set a conservative default. This is a rather large number and could probably + // be shaved down, but for now it will keep the process from running indefinite. + std::max(10000, (int(ctx->cells.size()) * int(ctx->cells.size()) / 8) + 1)); hpwl_scale_x = 1; hpwl_scale_y = 1; diff --git a/common/place/placer_heap.h b/common/place/placer_heap.h index 680e1dc7..e554a8e0 100644 --- a/common/place/placer_heap.h +++ b/common/place/placer_heap.h @@ -42,7 +42,7 @@ struct PlacerHeapCfg float solverTolerance; bool placeAllAtOnce; bool parallelRefine; - bool no_placement_timeout; + int cell_placement_timeout; int hpwl_scale_x, hpwl_scale_y; int spread_scale_x, spread_scale_y; |