public void OptimalThreadCountTest()
{
// Just get out if ParallelEx.SINGLE_THREADED let the ParallelExNotSingleThreadedTest do the work
// of telling the developer. Too confusing to decypher why this test would be failing
if (ParallelEx.SINGLE_THREADED)
{
return;
}
// On some systems we find that parallel performance suffers when not using ServerGC, as during SkylineTester runs, so we lower the max thread count
var hasReducedLoadThreadCount = !System.Runtime.GCSettings.IsServerGC;
Assert.AreEqual(hasReducedLoadThreadCount ? MultiFileLoader.MAX_PARALLEL_LOAD_FILES_USER_GC : MultiFileLoader.MAX_PARALLEL_LOAD_FILES,
MultiFileLoader.GetMaxLoadThreadCount());
// Make sure an explicit number of threads just returns that number of threads
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.one_at_a_time));
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// i7 4-core
int processors = 8;
Assert.AreEqual(1, MultiFileLoader.GetOptimalThreadCount(null, 6, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.one_at_a_time));
Assert.AreEqual(processors / 4, MultiFileLoader.GetOptimalThreadCount(null, 6, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(Math.Min(processors / 2, MultiFileLoader.GetMaxLoadThreadCount()), MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing 6 files into 2 cycles of 3
Assert.AreEqual(3, MultiFileLoader.GetOptimalThreadCount(null, 6, 8, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// i7 6-core
processors = 12;
Assert.AreEqual(processors / 4, MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(Math.Min(processors / 2, MultiFileLoader.GetMaxLoadThreadCount()), MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing 8 files into 2 cycles of 4, or if not using server GC then 3 cycles (of 3,3,2)
Assert.AreEqual(Math.Min(4, MultiFileLoader.GetMaxLoadThreadCount()), MultiFileLoader.GetOptimalThreadCount(null, 8, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Xeon 24-core
processors = 48;
Assert.AreEqual(Math.Min(processors / 4, MultiFileLoader.GetMaxLoadThreadCount()),
MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(Math.Min(processors / 2, MultiFileLoader.GetMaxLoadThreadCount()),
MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing 14 files into 2 cycles of 7, , or if not using server GC then 5 cycles (of 3,3,3,3,2)
Assert.AreEqual(hasReducedLoadThreadCount ? MultiFileLoader.GetMaxLoadThreadCount() : MultiFileLoader.MAX_PARALLEL_LOAD_FILES / 2 + 1,
MultiFileLoader.GetOptimalThreadCount(null, MultiFileLoader.MAX_PARALLEL_LOAD_FILES + 2, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
}
public void OptimalThreadCountTest()
{
// Just get out if ParallelEx.SINGLE_THREADED let the ParallelExNotSingleThreadedTest do the work
// of telling the developer. Too confusing to decypher why this test would be failing
if (ParallelEx.SINGLE_THREADED)
{
return;
}
// Make sure an explicit number of threads just returns that number of threads
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.one_at_a_time));
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(4, null, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// i7 4-core
int processors = 8;
Assert.AreEqual(1, MultiFileLoader.GetOptimalThreadCount(null, 6, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.one_at_a_time));
Assert.AreEqual(processors / 4, MultiFileLoader.GetOptimalThreadCount(null, 6, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(processors / 2, MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing 6 files into 2 cycles of 3
Assert.AreEqual(3, MultiFileLoader.GetOptimalThreadCount(null, 6, 8, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// i7 6-core
processors = 12;
Assert.AreEqual(processors / 4, MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(processors / 2, MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing 8 files into 2 cycles of 4
Assert.AreEqual(4, MultiFileLoader.GetOptimalThreadCount(null, 8, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Xeon 24-core
processors = 48;
Assert.AreEqual(Math.Min(processors / 4, MultiFileLoader.MAX_PARALLEL_LOAD_FILES),
MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.several));
Assert.AreEqual(Math.Min(processors / 2, MultiFileLoader.MAX_PARALLEL_LOAD_FILES),
MultiFileLoader.GetOptimalThreadCount(null, null, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
// Load balancing
Assert.AreEqual(MultiFileLoader.MAX_PARALLEL_LOAD_FILES / 2 + 1,
MultiFileLoader.GetOptimalThreadCount(null, MultiFileLoader.MAX_PARALLEL_LOAD_FILES + 2, processors, MultiFileLoader.ImportResultsSimultaneousFileOptions.many));
}