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#include <fmt/format.h>
#include <torch/csrc/distributed/rpc/agent_utils.h>
namespace torch {
namespace distributed {
namespace rpc {
std::unordered_map<std::string, worker_id_t> collectNames(
::c10d::PrefixStore store,
const worker_id_t selfId,
const std::string& selfName,
const int worldSize) {
std::vector<uint8_t> selfNameVector(
(uint8_t*)selfName.c_str(),
(uint8_t*)selfName.c_str() + selfName.length());
store.set(c10::to_string(selfId), selfNameVector);
std::unordered_map<std::string, worker_id_t> nameToId;
nameToId.reserve(worldSize);
nameToId.emplace(selfName, selfId);
for (worker_id_t workerId = 0; workerId < worldSize; ++workerId) {
if (workerId == selfId) {
continue;
}
std::vector<uint8_t> workerNameVector = store.get(c10::to_string(workerId));
std::string workerName(
(char*)workerNameVector.data(), workerNameVector.size());
TORCH_CHECK(
nameToId.find(workerName) == nameToId.end(),
"RPC worker name ",
workerName,
" is not unique. Workers ",
nameToId.find(workerName)->second,
" and ",
workerId,
" share the same name.");
nameToId.emplace(workerName, workerId);
}
return nameToId;
}
std::vector<std::string> splitString(
const std::string& s,
const std::string& delim) {
std::vector<std::string> tokens;
size_t start = 0;
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
size_t end;
// Iterate through each delimiter
while ((end = s.find(delim, start)) != std::string::npos) {
tokens.emplace_back(s.substr(start, end - start));
start = end + delim.length();
}
tokens.emplace_back(s.substr(start));
return tokens;
}
const std::string allWorkerInfosKey = "_ALL_WORKER_INFOS";
std::unordered_map<std::string, worker_id_t> collectCurrentNames(
::c10d::PrefixStore store,
const worker_id_t selfId,
const std::string& selfName) {
std::vector<uint8_t> selfNameVector(
(uint8_t*)selfName.c_str(),
(uint8_t*)selfName.c_str() + selfName.length());
// Check that ID does not already exist and set {ID : NAME}
std::vector<uint8_t> resultVector = store.compareSet(
c10::to_string(selfId), std::vector<uint8_t>(), selfNameVector);
TORCH_CHECK(
resultVector == selfNameVector,
"RPC worker id ",
selfId,
" is not unique. Worker ",
resultVector,
" and already has ID and ",
selfNameVector,
" cannot be added.");
store.set(c10::to_string(selfId), selfNameVector);
std::unordered_map<std::string, worker_id_t> nameToId;
nameToId.emplace(selfName, selfId);
// Check to see if there is list of worker names in the store
bool worker_names_available =
store.check(std::vector<std::string>{allWorkerInfosKey});
std::string allWorkerInfos;
if (worker_names_available) {
// Get the current list of workers
std::vector<uint8_t> allWorkerInfosKeyVector = store.get(allWorkerInfosKey);
allWorkerInfos = std::string(
(char*)allWorkerInfosKeyVector.data(), allWorkerInfosKeyVector.size());
// workerInfos are comma separated with a comma at the end (e.g.
// "Name1-Rank1,Name2-Rank2,Name3-Rank2,") parse list of workers.
if (!allWorkerInfos.empty()) {
for (const std::string& workerInfoString : splitString(
allWorkerInfos.substr(0, allWorkerInfos.size() - 1), ",")) {
auto workerInfoVec = splitString(workerInfoString, "-");
std::string workerName = workerInfoVec.at(0);
int workerId = std::stoi(workerInfoVec.at(1));
TORCH_CHECK(
nameToId.find(workerName) == nameToId.end(),
"RPC worker name ",
workerName,
" is not unique. Workers ",
nameToId.find(workerName)->second,
" and ",
workerId,
" share the same name.");
nameToId.emplace(workerName, workerId);
}
}
}
// Add own name to worker list
allWorkerInfos = fmt::format("{}{}-{},", allWorkerInfos, selfName, selfId);
std::vector<uint8_t> allWorkerInfosVector(
(uint8_t*)allWorkerInfos.c_str(),
(uint8_t*)allWorkerInfos.c_str() + allWorkerInfos.length());
store.set(allWorkerInfosKey, allWorkerInfosVector);
return nameToId;
}
void removeCurrentName(
::c10d::PrefixStore store,
const worker_id_t selfId,
const std::string& selfName) {
// Get current list of names/ranks
std::vector<uint8_t> allWorkerInfosKeyVector = store.get(allWorkerInfosKey);
std::string allWorkerInfos = std::string(
(char*)allWorkerInfosKeyVector.data(), allWorkerInfosKeyVector.size());
// Remove the current name and rank
std::string str_to_erase = fmt::format("{}-{},", selfName, selfId);
int start_position_to_erase = allWorkerInfos.find(str_to_erase);
allWorkerInfos.erase(start_position_to_erase, str_to_erase.length());
// Set the new data
std::vector<uint8_t> newAllWorkerInfosVector(
(uint8_t*)allWorkerInfos.c_str(),
(uint8_t*)allWorkerInfos.c_str() + allWorkerInfos.length());
store.set(allWorkerInfosKey, newAllWorkerInfosVector);
}
const string storeKeyBarrierId = "_ID_";
const string storeKeyProcessCount = "PROCESS_COUNT";
const string storeKeyActiveCallCount = "ACTIVE_CALLS";
const string storeKeyReady = "READY";
static std::atomic<int> barrierId(0);
std::tuple<std::string, std::string, std::string> getNextKeyIds() {
barrierId++;
std::string processCountKey =
fmt::format("{}{}{}", storeKeyProcessCount, storeKeyBarrierId, barrierId);
std::string activeCallCountKey = fmt::format(
"{}{}{}", storeKeyActiveCallCount, storeKeyBarrierId, barrierId);
std::string barrierKey =
fmt::format("{}{}{}", storeKeyReady, storeKeyBarrierId, barrierId);
return std::make_tuple(processCountKey, activeCallCountKey, barrierKey);
}
// Synchronize process with all other agent processes strictly using store
// Block until all ``RpcAgent``s reach this method.
// Returns total number of active calls of all RPC agents in the group
int syncCallCount(
::c10d::PrefixStore store,
const int worldSize,
int activeCalls) {
std::string processCountKey, activeCallCountKey, readyKey;
std::tie(processCountKey, activeCallCountKey, readyKey) = getNextKeyIds();
// Add to keys which will record the number of processes and active calls
int totalCallCount = store.add(activeCallCountKey, activeCalls);
int totalProcessCount = store.add(processCountKey, 1);
// The last worker will need to set the ready key
if (totalProcessCount == worldSize) {
store.set(readyKey, std::vector<uint8_t>());
}
// Wait on the ready key to be set
store.wait(std::vector<std::string>{readyKey});
// Read count of active calls which may have changed
auto activeCallCountData = store.get(activeCallCountKey);
totalCallCount = std::stoi(
std::string(activeCallCountData.begin(), activeCallCountData.end()));
return totalCallCount;
}
} // namespace rpc
} // namespace distributed
} // namespace torch
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