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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file LICENSE.rst or https://cmake.org/licensing for details. */
#include "cmCTestBinPacker.h"
#include <algorithm>
#include <utility>
bool cmCTestBinPackerAllocation::operator==(
cmCTestBinPackerAllocation const& other) const
{
return this->ProcessIndex == other.ProcessIndex &&
this->SlotsNeeded == other.SlotsNeeded && this->Id == other.Id;
}
bool cmCTestBinPackerAllocation::operator!=(
cmCTestBinPackerAllocation const& other) const
{
return !(*this == other);
}
namespace {
/*
* The following algorithm is used to do two things:
*
* 1) Determine if a test's resource requirements can fit within the resources
* present on the system, and
* 2) Do the actual allocation
*
* This algorithm performs a recursive search, looking for a bin pack that will
* fit the specified requirements. It has a template to specify different
* optimization strategies. If it ever runs out of room, it backtracks as far
* down the stack as it needs to and tries a different combination until no
* more combinations can be tried.
*/
template <typename AllocationStrategy>
bool AllocateCTestResources(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string> const& resourcesSorted, std::size_t currentIndex,
std::vector<cmCTestBinPackerAllocation*>& allocations)
{
// Iterate through all large enough resources until we find a solution
std::size_t resourceIndex = 0;
while (resourceIndex < resourcesSorted.size()) {
auto const& resource = resources.at(resourcesSorted[resourceIndex]);
if (resource.Free() >=
static_cast<unsigned int>(allocations[currentIndex]->SlotsNeeded)) {
// Preemptively allocate the resource
allocations[currentIndex]->Id = resourcesSorted[resourceIndex];
if (currentIndex + 1 >= allocations.size()) {
// We have a solution
return true;
}
// Move the resource up the list until it is sorted again
auto resources2 = resources;
auto resourcesSorted2 = resourcesSorted;
resources2[resourcesSorted2[resourceIndex]].Locked +=
allocations[currentIndex]->SlotsNeeded;
AllocationStrategy::IncrementalSort(resources2, resourcesSorted2,
resourceIndex);
// Recurse one level deeper
if (AllocateCTestResources<AllocationStrategy>(
resources2, resourcesSorted2, currentIndex + 1, allocations)) {
return true;
}
}
// No solution found here, deallocate the resource and try the next one
allocations[currentIndex]->Id.clear();
auto freeSlots = resources.at(resourcesSorted.at(resourceIndex)).Free();
do {
++resourceIndex;
} while (resourceIndex < resourcesSorted.size() &&
resources.at(resourcesSorted.at(resourceIndex)).Free() ==
freeSlots);
}
// No solution was found
return false;
}
template <typename AllocationStrategy>
bool AllocateCTestResources(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<cmCTestBinPackerAllocation>& allocations)
{
// Sort the resource requirements in descending order by slots needed
std::vector<cmCTestBinPackerAllocation*> allocationsPtr;
allocationsPtr.reserve(allocations.size());
for (auto& allocation : allocations) {
allocationsPtr.push_back(&allocation);
}
std::stable_sort(
allocationsPtr.rbegin(), allocationsPtr.rend(),
[](cmCTestBinPackerAllocation* a1, cmCTestBinPackerAllocation* a2) {
return a1->SlotsNeeded < a2->SlotsNeeded;
});
// Sort the resources according to sort strategy
std::vector<std::string> resourcesSorted;
resourcesSorted.reserve(resources.size());
for (auto const& res : resources) {
resourcesSorted.push_back(res.first);
}
AllocationStrategy::InitialSort(resources, resourcesSorted);
// Do the actual allocation
return AllocateCTestResources<AllocationStrategy>(
resources, resourcesSorted, static_cast<std::size_t>(0), allocationsPtr);
}
class RoundRobinAllocationStrategy
{
public:
static void InitialSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted);
static void IncrementalSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted, std::size_t lastAllocatedIndex);
};
void RoundRobinAllocationStrategy::InitialSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted)
{
std::stable_sort(
resourcesSorted.rbegin(), resourcesSorted.rend(),
[&resources](std::string const& id1, std::string const& id2) {
return resources.at(id1).Free() < resources.at(id2).Free();
});
}
void RoundRobinAllocationStrategy::IncrementalSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted, std::size_t lastAllocatedIndex)
{
auto tmp = resourcesSorted[lastAllocatedIndex];
std::size_t i = lastAllocatedIndex;
while (i < resourcesSorted.size() - 1 &&
resources.at(resourcesSorted[i + 1]).Free() >
resources.at(tmp).Free()) {
resourcesSorted[i] = resourcesSorted[i + 1];
++i;
}
resourcesSorted[i] = tmp;
}
class BlockAllocationStrategy
{
public:
static void InitialSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted);
static void IncrementalSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted, std::size_t lastAllocatedIndex);
};
void BlockAllocationStrategy::InitialSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<std::string>& resourcesSorted)
{
std::stable_sort(
resourcesSorted.rbegin(), resourcesSorted.rend(),
[&resources](std::string const& id1, std::string const& id2) {
return resources.at(id1).Free() < resources.at(id2).Free();
});
}
void BlockAllocationStrategy::IncrementalSort(
std::map<std::string, cmCTestResourceAllocator::Resource> const&,
std::vector<std::string>& resourcesSorted, std::size_t lastAllocatedIndex)
{
auto tmp = resourcesSorted[lastAllocatedIndex];
std::size_t i = lastAllocatedIndex;
while (i > 0) {
resourcesSorted[i] = resourcesSorted[i - 1];
--i;
}
resourcesSorted[i] = tmp;
}
}
bool cmAllocateCTestResourcesRoundRobin(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<cmCTestBinPackerAllocation>& allocations)
{
return AllocateCTestResources<RoundRobinAllocationStrategy>(resources,
allocations);
}
bool cmAllocateCTestResourcesBlock(
std::map<std::string, cmCTestResourceAllocator::Resource> const& resources,
std::vector<cmCTestBinPackerAllocation>& allocations)
{
return AllocateCTestResources<BlockAllocationStrategy>(resources,
allocations);
}
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