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Remove messy load balancing exercise #181

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merged 1 commit into from
Sep 7, 2022
Merged

Remove messy load balancing exercise #181

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35 changes: 6 additions & 29 deletions Code_Exercises/Exercise_13_Load_Balancing/solution.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,38 +26,15 @@ class vector_add_second;
// allowing computation to be split across said devices.
std::vector<sycl::device> get_two_devices() {
auto devs = sycl::device::get_devices();
if (devs.size() == 0) throw "No devices available";
if (devs.size() == 1)
return {devs[0], devs[0]};

// Choose the first non-host devices
std::sort(devs.begin(), devs.end(), [](sycl::device &d1, sycl::device &d2) {
return !d1.is_host() && d2.is_host(); });

auto host_it{std::find_if(devs.begin(), devs.end(),
[](sycl::device &d) { return d.is_host(); })};

// Don't mix Nvidia and non-Nvidia devices to avoid incompatible binary
auto nvidia_it{std::find_if(devs.begin(), devs.end(), [](sycl::device &d) {
return d.get_info<sycl::info::device::vendor>().find("NVIDIA") !=
std::string::npos;
})};
if (nvidia_it != devs.end()) {
auto nvidia_it2 =
std::find_if(nvidia_it + 1, devs.end(), [](sycl::device &d) {
return d.get_info<sycl::info::device::vendor>().find("NVIDIA") !=
std::string::npos;
});
if (nvidia_it2 != devs.end())
return {*nvidia_it, *nvidia_it2};
if (host_it != devs.end())
return {*nvidia_it, *host_it};
return {*nvidia_it, *nvidia_it};
}

auto dev_it{std::find_if(devs.begin(), devs.end(),
[](sycl::device &d) { return !d.is_host(); })};
auto dev_it2{std::find_if(dev_it + 1, devs.end(),
[](sycl::device &d) { return !d.is_host(); })};

if (dev_it2 != devs.end())
return {*dev_it, *dev_it2};
return {*host_it, *dev_it};
return {devs[0], devs[1]};
}


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