Let the test fail gracefully if no devies are found

If more than one device is available, run the tests on all available
devices.

Replace elements_with_stide with uniform_elements.

DataFormats/SiPixelDigiSoA/test/alpaka/Digis_test.cc

@@ -1,3 +1,4 @@
+#include <cstdlib>
 #include <unistd.h>
 
 #include <alpaka/alpaka.hpp>
@@ -6,43 +7,46 @@
 #include "DataFormats/SiPixelDigiSoA/interface/SiPixelDigisHost.h"
 #include "DataFormats/SiPixelDigiSoA/interface/SiPixelDigisSoA.h"
 #include "DataFormats/SiPixelDigiSoA/interface/alpaka/SiPixelDigisSoACollection.h"
+#include "FWCore/Utilities/interface/stringize.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/config.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/devices.h"
-#include "HeterogeneousCore/AlpakaInterface/interface/host.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/memory.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/traits.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/workdivision.h"
 
-using namespace ALPAKA_ACCELERATOR_NAMESPACE;
-
-namespace ALPAKA_ACCELERATOR_NAMESPACE {
-  namespace testDigisSoA {
+#include "Digis_test.h"
 
-    void runKernels(SiPixelDigisSoAView digis_view, Queue& queue);
+using namespace ALPAKA_ACCELERATOR_NAMESPACE;
 
+int main() {
+  // Get the list of devices on the current platform
+  auto const& devices = cms::alpakatools::devices<Platform>();
+  if (devices.empty()) {
+    std::cerr << "No devices available for the " EDM_STRINGIZE(ALPAKA_ACCELERATOR_NAMESPACE) " backend, "
+      "the test will be skipped.\n";
+    exit(EXIT_FAILURE);
   }
-}  // namespace ALPAKA_ACCELERATOR_NAMESPACE
 
-int main() {
-  const auto host = cms::alpakatools::host();
-  const auto device = cms::alpakatools::devices<Platform>()[0];
-  Queue queue(device);
-
-  // Inner scope to deallocate memory before destroying the stream
-  {
-    // Instantiate tracks on device. PortableDeviceCollection allocates
-    // SoA on device automatically.
-    SiPixelDigisSoACollection digis_d(1000, queue);
-    testDigisSoA::runKernels(digis_d.view(), queue);
-
-    // Instantate tracks on host. This is where the data will be
-    // copied to from device.
-    SiPixelDigisHost digis_h(digis_d.view().metadata().size(), queue);
-
-    std::cout << digis_h.view().metadata().size() << std::endl;
-    alpaka::memcpy(queue, digis_h.buffer(), digis_d.const_buffer());
-    alpaka::wait(queue);
+  // Run the test on each device
+  for (const auto& device : devices) {
+    Queue queue(device);
+
+    // Inner scope to deallocate memory before destroying the stream
+    {
+      // Instantiate tracks on device. PortableDeviceCollection allocates
+      // SoA on device automatically.
+      SiPixelDigisSoACollection digis_d(1000, queue);
+      testDigisSoA::runKernels(digis_d.view(), queue);
+
+      // Instantate tracks on host. This is where the data will be
+      // copied to from device.
+      SiPixelDigisHost digis_h(digis_d.view().metadata().size(), queue);
+
+      std::cout << digis_h.view().metadata().size() << std::endl;
+      alpaka::memcpy(queue, digis_h.buffer(), digis_d.const_buffer());
+      alpaka::wait(queue);
+    }
   }
 
-  return 0;
+  return EXIT_SUCCESS;
 }

DataFormats/SiPixelDigiSoA/test/alpaka/Digis_test.dev.cc

@@ -1,49 +1,48 @@
+#include <alpaka/alpaka.hpp>
+
 #include "DataFormats/SiPixelDigiSoA/interface/SiPixelDigisDevice.h"
-#include "DataFormats/SiPixelDigiSoA/interface/alpaka/SiPixelDigisSoACollection.h"
 #include "DataFormats/SiPixelDigiSoA/interface/SiPixelDigisHost.h"
-#include "HeterogeneousCore/AlpakaInterface/interface/workdivision.h"
+#include "DataFormats/SiPixelDigiSoA/interface/alpaka/SiPixelDigisSoACollection.h"
+#include "HeterogeneousCore/AlpakaInterface/interface/config.h"
 #include "HeterogeneousCore/AlpakaInterface/interface/traits.h"
+#include "HeterogeneousCore/AlpakaInterface/interface/workdivision.h"
 
-using namespace alpaka;
-
-namespace ALPAKA_ACCELERATOR_NAMESPACE {
+#include "Digis_test.h"
 
-  using namespace cms::alpakatools;
-  namespace testDigisSoA {
+namespace ALPAKA_ACCELERATOR_NAMESPACE::testDigisSoA {
 
-    class TestFillKernel {
-    public:
-      template <typename TAcc, typename = std::enable_if_t<isAccelerator<TAcc>>>
-      ALPAKA_FN_ACC void operator()(TAcc const& acc, SiPixelDigisSoAView digi_view) const {
-        for (int32_t j : elements_with_stride(acc, digi_view.metadata().size())) {
-          digi_view[j].clus() = j;
-          digi_view[j].rawIdArr() = j * 2;
-          digi_view[j].xx() = j * 3;
-          digi_view[j].moduleId() = j * 4;
-        }
+  class TestFillKernel {
+  public:
+    template <typename TAcc, typename = std::enable_if_t<alpaka::isAccelerator<TAcc>>>
+    ALPAKA_FN_ACC void operator()(TAcc const& acc, SiPixelDigisSoAView digi_view) const {
+      for (int32_t j : cms::alpakatools::uniform_elements(acc, digi_view.metadata().size())) {
+        digi_view[j].clus() = j;
+        digi_view[j].rawIdArr() = j * 2;
+        digi_view[j].xx() = j * 3;
+        digi_view[j].moduleId() = j * 4;
       }
-    };
+    }
+  };
 
-    class TestVerifyKernel {
-    public:
-      template <typename TAcc, typename = std::enable_if_t<isAccelerator<TAcc>>>
-      ALPAKA_FN_ACC void operator()(TAcc const& acc, SiPixelDigisSoAConstView digi_view) const {
-        for (uint32_t j : elements_with_stride(acc, digi_view.metadata().size())) {
-          assert(digi_view[j].clus() == int(j));
-          assert(digi_view[j].rawIdArr() == j * 2);
-          assert(digi_view[j].xx() == j * 3);
-          assert(digi_view[j].moduleId() == j * 4);
-        }
+  class TestVerifyKernel {
+  public:
+    template <typename TAcc, typename = std::enable_if_t<alpaka::isAccelerator<TAcc>>>
+    ALPAKA_FN_ACC void operator()(TAcc const& acc, SiPixelDigisSoAConstView digi_view) const {
+      for (uint32_t j : cms::alpakatools::uniform_elements(acc, digi_view.metadata().size())) {
+        assert(digi_view[j].clus() == int(j));
+        assert(digi_view[j].rawIdArr() == j * 2);
+        assert(digi_view[j].xx() == j * 3);
+        assert(digi_view[j].moduleId() == j * 4);
       }
-    };
-
-    void runKernels(SiPixelDigisSoAView digi_view, Queue& queue) {
-      uint32_t items = 64;
-      uint32_t groups = divide_up_by(digi_view.metadata().size(), items);
-      auto workDiv = make_workdiv<Acc1D>(groups, items);
-      alpaka::exec<Acc1D>(queue, workDiv, TestFillKernel{}, digi_view);
-      alpaka::exec<Acc1D>(queue, workDiv, TestVerifyKernel{}, digi_view);
     }
+  };
+
+  void runKernels(SiPixelDigisSoAView digi_view, Queue& queue) {
+    uint32_t items = 64;
+    uint32_t groups = cms::alpakatools::divide_up_by(digi_view.metadata().size(), items);
+    auto workDiv = cms::alpakatools::make_workdiv<Acc1D>(groups, items);
+    alpaka::exec<Acc1D>(queue, workDiv, TestFillKernel{}, digi_view);
+    alpaka::exec<Acc1D>(queue, workDiv, TestVerifyKernel{}, digi_view);
+  }
 
-  }  // namespace testDigisSoA
-}  // namespace ALPAKA_ACCELERATOR_NAMESPACE
+}  // namespace ALPAKA_ACCELERATOR_NAMESPACE::testDigisSoA

DataFormats/SiPixelDigiSoA/test/alpaka/Digis_test.h

@@ -0,0 +1,13 @@
+#ifndef DataFormats_SiPixelDigiSoA_test_alpaka_Digis_test_h
+#define DataFormats_SiPixelDigiSoA_test_alpaka_Digis_test_h
+
+#include "DataFormats/SiPixelDigiSoA/interface/SiPixelDigisSoA.h"
+#include "HeterogeneousCore/AlpakaInterface/interface/config.h"
+
+namespace ALPAKA_ACCELERATOR_NAMESPACE::testDigisSoA {
+
+  void runKernels(SiPixelDigisSoAView digis_view, Queue& queue);
+
+}  // namespace ALPAKA_ACCELERATOR_NAMESPACE::testDigisSoA
+
+#endif  // DataFormats_SiPixelDigiSoA_test_alpaka_Digis_test_h