contrib/llvm/tools/llvm-mca/SchedulerStatistics.cpp

   1 //===--------------------- SchedulerStatistics.cpp --------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 /// \file
  10 ///
  11 /// This file implements the SchedulerStatistics interface.
  12 ///
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "SchedulerStatistics.h"
  16 #include "llvm/Support/Format.h"
  17
  18 using namespace llvm;
  19
  20 namespace mca {
  21
  22 void SchedulerStatistics::onEvent(const HWInstructionEvent &Event) {
  23   if (Event.Type == HWInstructionEvent::Issued)
  24     ++NumIssued;
  25 }
  26
  27 void SchedulerStatistics::onReservedBuffers(ArrayRef<unsigned> Buffers) {
  28   for (const unsigned Buffer : Buffers) {
  29     if (BufferedResources.find(Buffer) != BufferedResources.end()) {
  30       BufferUsage &BU = BufferedResources[Buffer];
  31       BU.SlotsInUse++;
  32       BU.MaxUsedSlots = std::max(BU.MaxUsedSlots, BU.SlotsInUse);
  33       continue;
  34     }
  35
  36     BufferedResources.insert(
  37         std::pair<unsigned, BufferUsage>(Buffer, {1U, 1U}));
  38   }
  39 }
  40
  41 void SchedulerStatistics::onReleasedBuffers(ArrayRef<unsigned> Buffers) {
  42   for (const unsigned Buffer : Buffers) {
  43     assert(BufferedResources.find(Buffer) != BufferedResources.end() &&
  44            "Buffered resource not in map?");
  45     BufferUsage &BU = BufferedResources[Buffer];
  46     BU.SlotsInUse--;
  47   }
  48 }
  49
  50 void SchedulerStatistics::printSchedulerStatistics(
  51     llvm::raw_ostream &OS) const {
  52   std::string Buffer;
  53   raw_string_ostream TempStream(Buffer);
  54   TempStream << "\n\nSchedulers - number of cycles where we saw N instructions "
  55                 "issued:\n";
  56   TempStream << "[# issued], [# cycles]\n";
  57   for (const std::pair<unsigned, unsigned> &Entry : IssuedPerCycle) {
  58     TempStream << " " << Entry.first << ",          " << Entry.second << "  ("
  59                << format("%.1f", ((double)Entry.second / NumCycles) * 100)
  60                << "%)\n";
  61   }
  62
  63   TempStream.flush();
  64   OS << Buffer;
  65 }
  66
  67 void SchedulerStatistics::printSchedulerUsage(raw_ostream &OS) const {
  68   std::string Buffer;
  69   raw_string_ostream TempStream(Buffer);
  70   TempStream << "\n\nScheduler's queue usage:\n";
  71   // Early exit if no buffered resources were consumed.
  72   if (BufferedResources.empty()) {
  73     TempStream << "No scheduler resources used.\n";
  74     TempStream.flush();
  75     OS << Buffer;
  76     return;
  77   }
  78
  79   for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
  80     const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
  81     if (ProcResource.BufferSize <= 0)
  82       continue;
  83
  84     const auto It = BufferedResources.find(I);
  85     unsigned MaxUsedSlots =
  86         It == BufferedResources.end() ? 0 : It->second.MaxUsedSlots;
  87     TempStream << ProcResource.Name << ",  " << MaxUsedSlots << '/'
  88                << ProcResource.BufferSize << '\n';
  89   }
  90
  91   TempStream.flush();
  92   OS << Buffer;
  93 }
  94 } // namespace mca