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78dfceef4b
Add a "-j" option to llvm-profdata to control the number of threads used.
Auto-detect NumThreads when it isn't specified, and avoid spawning threads when
they wouldn't be beneficial.
I tested this patch using a raw profile produced by clang (147MB). Here is the
time taken to merge 4 copies together on my laptop:
No thread pool: 112.87s user 5.92s system 97% cpu 2:01.08 total
With 2 threads: 134.99s user 26.54s system 164% cpu 1:33.31 total
Changes since the initial commit:
- When handling odd-length inputs, call ThreadPool::wait() before merging the
last profile. Should fix a race/off-by-one (see r275937).
Differential Revision: https://reviews.llvm.org/D22438
llvm-svn: 275938
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
//=-- InstrProfWriter.h - Instrumented profiling writer -----------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing profiling data for instrumentation
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// based PGO and coverage.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PROFILEDATA_INSTRPROFWRITER_H
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#define LLVM_PROFILEDATA_INSTRPROFWRITER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ProfileData/InstrProf.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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/// Writer for instrumentation based profile data.
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class ProfOStream;
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class InstrProfRecordWriterTrait;
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class InstrProfWriter {
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public:
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typedef SmallDenseMap<uint64_t, InstrProfRecord, 1> ProfilingData;
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enum ProfKind { PF_Unknown = 0, PF_FE, PF_IRLevel };
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private:
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bool Sparse;
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StringMap<ProfilingData> FunctionData;
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ProfKind ProfileKind;
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// Use raw pointer here for the incomplete type object.
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InstrProfRecordWriterTrait *InfoObj;
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public:
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InstrProfWriter(bool Sparse = false);
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~InstrProfWriter();
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/// Add function counts for the given function. If there are already counts
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/// for this function and the hash and number of counts match, each counter is
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/// summed. Optionally scale counts by \p Weight.
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Error addRecord(InstrProfRecord &&I, uint64_t Weight = 1);
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/// Merge existing function counts from the given writer.
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Error mergeRecordsFromWriter(InstrProfWriter &&IPW);
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/// Write the profile to \c OS
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void write(raw_fd_ostream &OS);
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/// Write the profile in text format to \c OS
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void writeText(raw_fd_ostream &OS);
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/// Write \c Record in text format to \c OS
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static void writeRecordInText(const InstrProfRecord &Record,
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InstrProfSymtab &Symtab, raw_fd_ostream &OS);
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/// Write the profile, returning the raw data. For testing.
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std::unique_ptr<MemoryBuffer> writeBuffer();
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/// Set the ProfileKind. Report error if mixing FE and IR level profiles.
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Error setIsIRLevelProfile(bool IsIRLevel) {
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if (ProfileKind == PF_Unknown) {
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ProfileKind = IsIRLevel ? PF_IRLevel: PF_FE;
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return Error::success();
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}
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return (IsIRLevel == (ProfileKind == PF_IRLevel))
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? Error::success()
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: make_error<InstrProfError>(
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instrprof_error::unsupported_version);
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}
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// Internal interface for testing purpose only.
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void setValueProfDataEndianness(support::endianness Endianness);
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void setOutputSparse(bool Sparse);
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private:
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bool shouldEncodeData(const ProfilingData &PD);
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void writeImpl(ProfOStream &OS);
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};
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} // end namespace llvm
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#endif
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