CTest: Add options to control test process affinity to CPUs

In commit v2.8.0~170 (ENH: Added ctest test options PROCESSORS and
RUN_SERIAL, 2009-09-07) CTest learned to track the number of processors
allocated to running tests in order to balance it against the desired
level of parallelism.  Extend this idea by introducing a new
`PROCESSOR_AFFINITY` test property to ask that CTest run a test
with the CPU affinity mask set.  This will allow a set of tests
that are running concurrently to use disjoint CPU resources.

1 files changed, 6 insertions, 3 deletions

diff --git a/Source/CTest/cmCTestRunTest.cxx b/Source/CTest/cmCTestRunTest.cxx
index 30ad38c..1ae36f7 100644
--- a/Source/CTest/cmCTestRunTest.cxx
+++ b/Source/CTest/cmCTestRunTest.cxx
@@ -515,7 +515,8 @@ bool cmCTestRunTest::StartTest(size_t total)
   }
 
   return this->ForkProcess(timeout, this->TestProperties->ExplicitTimeout,
-                           &this->TestProperties->Environment);
+                           &this->TestProperties->Environment,
+                           &this->TestProperties->Affinity);
 }
 
 void cmCTestRunTest::ComputeArguments()
@@ -591,7 +592,8 @@ void cmCTestRunTest::DartProcessing()
 }
 
 bool cmCTestRunTest::ForkProcess(cmDuration testTimeOut, bool explicitTimeout,
-                                 std::vector<std::string>* environment)
+                                 std::vector<std::string>* environment,
+                                 std::vector<size_t>* affinity)
 {
   this->TestProcess = cm::make_unique<cmProcess>(*this);
   this->TestProcess->SetId(this->Index);
@@ -637,7 +639,8 @@ bool cmCTestRunTest::ForkProcess(cmDuration testTimeOut, bool explicitTimeout,
     cmSystemTools::AppendEnv(*environment);
   }
 
-  return this->TestProcess->StartProcess(this->MultiTestHandler.Loop);
+  return this->TestProcess->StartProcess(this->MultiTestHandler.Loop,
+                                         affinity);
 }
 
 void cmCTestRunTest::WriteLogOutputTop(size_t completed, size_t total)