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#include <array>
#include <cstring>
#include <string>
#include <unordered_map>
#include <libshm/err.h>
#include <libshm/libshm.h>
#include <libshm/socket.h>
std::unordered_map<std::string, ClientSocket> managers;
std::string manager_executable_path;
AllocInfo get_alloc_info(const char* filename) {
AllocInfo info = {0};
info.pid = getpid();
info.free = false;
size_t len = strlen(filename);
if (len >= sizeof(info.filename)) {
throw std::runtime_error("MapAllocatorContext_filename too long");
}
memcpy(info.filename, filename, len + 1);
return info;
}
void start_manager() {
std::array<int, 2> pipe_ends;
SYSCHECK_ERR_RETURN_NEG1(pipe(pipe_ends.data()));
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
pid_t pid;
SYSCHECK_ERR_RETURN_NEG1(pid = fork());
if (!pid) {
SYSCHECK_ERR_RETURN_NEG1(close(pipe_ends[0]));
SYSCHECK_ERR_RETURN_NEG1(dup2(pipe_ends[1], 1)); // Replace stdout
SYSCHECK_ERR_RETURN_NEG1(close(pipe_ends[1]));
execl(manager_executable_path.c_str(), "torch_shm_manager", NULL);
std::string msg("ERROR: execl failed: ");
msg += std::strerror(errno);
msg += '\n';
write(1, msg.c_str(), msg.size());
exit(1);
}
SYSCHECK_ERR_RETURN_NEG1(close(pipe_ends[1]));
constexpr auto MAX_BUFFER_SIZE = 1000;
std::array<char, MAX_BUFFER_SIZE> buffer;
std::string handle;
while (handle.empty() || handle.back() != '\n') {
const auto bytes_read = read(pipe_ends[0], buffer.data(), buffer.size());
SYSCHECK_ERR_RETURN_NEG1(bytes_read);
if (bytes_read == 0) {
break;
}
handle.append(buffer.data(), bytes_read);
}
SYSCHECK_ERR_RETURN_NEG1(close(pipe_ends[0]));
if (handle.length() == 0) {
std::string msg("no response from torch_shm_manager at \"");
msg += manager_executable_path;
msg += "\"";
throw std::runtime_error(msg);
}
handle.pop_back(); // remove \n
if (handle.rfind("ERROR: ", 0) == 0) {
std::string msg("torch_shm_manager at \"");
msg += manager_executable_path;
msg += "\": ";
msg += handle.substr(7); // remove "ERROR: "
throw std::runtime_error(msg);
}
ClientSocket manager{handle};
managers.emplace(std::move(handle), std::move(manager));
}
ClientSocket& get_manager_socket(const std::string& manager_handle) {
auto it = managers.find(manager_handle);
if (it == managers.end()) {
auto socket = ClientSocket(manager_handle);
auto result = managers.emplace(manager_handle, std::move(socket));
return result.first->second;
} else {
return it->second;
}
}
void libshm_init(const char* manager_exec_path) {
manager_executable_path = std::string(manager_exec_path);
}
THManagedMapAllocatorInit::THManagedMapAllocatorInit(
const char* manager_handle,
const char* filename)
: manager_handle_(manager_handle ? manager_handle : "") {
// TODO: unlock GIL when contacting the manager
try {
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
ClientSocket* socket;
if (!manager_handle_.empty()) {
socket = &get_manager_socket(manager_handle_);
} else {
if (managers.size() == 0) {
start_manager();
}
const auto& manager = managers.begin();
manager_handle_ = manager->first;
socket = &manager->second;
}
AllocInfo info = get_alloc_info(filename);
socket->register_allocation(info);
} catch (std::exception& e) {
TORCH_CHECK(false, e.what());
}
}
THManagedMapAllocator::THManagedMapAllocator(
const char* manager_handle,
const char* filename,
int flags,
ptrdiff_t size)
: THManagedMapAllocatorInit(manager_handle, filename),
at::RefcountedMapAllocator(filename, flags, size) {}
void THManagedMapAllocator::close() {
if (closed_)
return;
AllocInfo info = get_alloc_info(filename());
info.free = true;
ClientSocket& socket = get_manager_socket(manager_handle_);
at::RefcountedMapAllocator::close();
socket.register_deallocation(info);
}
static void deleteTHManagedMapAllocator(void* ptr) {
delete static_cast<THManagedMapAllocator*>(ptr);
}
at::DataPtr THManagedMapAllocator::makeDataPtr(
const char* manager_handle,
const char* filename,
int flags,
ptrdiff_t size) {
auto* context =
new THManagedMapAllocator(manager_handle, filename, flags, size);
return {
context->data(),
context,
&deleteTHManagedMapAllocator,
at::DeviceType::CPU};
}
THManagedMapAllocator* THManagedMapAllocator::fromDataPtr(
const at::DataPtr& dptr) {
return dptr.cast_context<THManagedMapAllocator>(&deleteTHManagedMapAllocator);
}
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