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11bbe8413e
The number of hardware threads available to a ThreadPool can be limited if setting an affinity mask.
For example:
> start /B /AFFINITY 0xF lld-link.exe ...
Would let LLD only use 4 hyper-threads.
Previously, there was an outstanding issue on Windows Server 2019 on dual-CPU machines, which was preventing from using both CPU sockets. In normal conditions, when no affinity mask was set, ProcessorGroup::AllThreads was different from ProcessorGroup::UsableThreads. The previous code in llvm/lib/Support/Windows/Threading.inc L201 was improperly assuming those two values to be equal, and consequently was limiting the execution to only one CPU socket.
Differential Revision: https://reviews.llvm.org/D92419
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//===-- Program.cpp - Implement OS Program Concept --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the operating system Program concept.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Program.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Support/raw_ostream.h"
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#include <system_error>
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using namespace llvm;
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using namespace sys;
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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static bool Execute(ProcessInfo &PI, StringRef Program,
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ArrayRef<StringRef> Args, Optional<ArrayRef<StringRef>> Env,
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ArrayRef<Optional<StringRef>> Redirects,
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unsigned MemoryLimit, std::string *ErrMsg,
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BitVector *AffinityMask);
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int sys::ExecuteAndWait(StringRef Program, ArrayRef<StringRef> Args,
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Optional<ArrayRef<StringRef>> Env,
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ArrayRef<Optional<StringRef>> Redirects,
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unsigned SecondsToWait, unsigned MemoryLimit,
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std::string *ErrMsg, bool *ExecutionFailed,
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Optional<ProcessStatistics> *ProcStat,
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BitVector *AffinityMask) {
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assert(Redirects.empty() || Redirects.size() == 3);
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ProcessInfo PI;
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if (Execute(PI, Program, Args, Env, Redirects, MemoryLimit, ErrMsg,
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AffinityMask)) {
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if (ExecutionFailed)
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*ExecutionFailed = false;
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ProcessInfo Result =
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Wait(PI, SecondsToWait, /*WaitUntilTerminates=*/SecondsToWait == 0,
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ErrMsg, ProcStat);
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return Result.ReturnCode;
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}
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if (ExecutionFailed)
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*ExecutionFailed = true;
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return -1;
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}
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ProcessInfo sys::ExecuteNoWait(StringRef Program, ArrayRef<StringRef> Args,
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Optional<ArrayRef<StringRef>> Env,
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ArrayRef<Optional<StringRef>> Redirects,
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unsigned MemoryLimit, std::string *ErrMsg,
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bool *ExecutionFailed, BitVector *AffinityMask) {
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assert(Redirects.empty() || Redirects.size() == 3);
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ProcessInfo PI;
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if (ExecutionFailed)
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*ExecutionFailed = false;
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if (!Execute(PI, Program, Args, Env, Redirects, MemoryLimit, ErrMsg,
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AffinityMask))
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if (ExecutionFailed)
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*ExecutionFailed = true;
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return PI;
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}
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bool sys::commandLineFitsWithinSystemLimits(StringRef Program,
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ArrayRef<const char *> Args) {
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SmallVector<StringRef, 8> StringRefArgs;
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StringRefArgs.reserve(Args.size());
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for (const char *A : Args)
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StringRefArgs.emplace_back(A);
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return commandLineFitsWithinSystemLimits(Program, StringRefArgs);
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}
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void sys::printArg(raw_ostream &OS, StringRef Arg, bool Quote) {
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const bool Escape = Arg.find_first_of(" \"\\$") != StringRef::npos;
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if (!Quote && !Escape) {
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OS << Arg;
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return;
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}
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// Quote and escape. This isn't really complete, but good enough.
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OS << '"';
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for (const auto c : Arg) {
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if (c == '"' || c == '\\' || c == '$')
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OS << '\\';
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OS << c;
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}
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OS << '"';
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}
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// Include the platform-specific parts of this class.
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#ifdef LLVM_ON_UNIX
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#include "Unix/Program.inc"
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#endif
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#ifdef _WIN32
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#include "Windows/Program.inc"
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#endif
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