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nix eval-hydra-jobs: Support parallel evaluation

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Example usage:

  $ nix eval-hydra-jobs -f '<nixpkgs/pkgs/top-level/release.nix>' '' \
      --max-memory-size 2048 --workers 8
This commit is contained in:
Eelco Dolstra 2020-02-14 22:34:14 +01:00
parent e375da6899
commit 4c24263967
1 changed files with 233 additions and 90 deletions
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323
src/nix/eval-hydra-jobs.cc
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@ -5,6 +5,10 @@
#include "common-args.hh"
#include "json.hh"
#include "get-drvs.hh"
#include "attr-path.hh"
#include <nlohmann/json.hpp>
#include <sys/resource.h>
using namespace nix;
@ -36,6 +40,8 @@ static std::string queryMetaStrings(EvalState & state, DrvInfo & drv, const stri
struct CmdEvalHydraJobs : MixJSON, MixDryRun, InstallableCommand
{
std::optional<Path> gcRootsDir;
size_t nrWorkers = 1;
size_t maxMemorySize = 4ULL * 1024;
CmdEvalHydraJobs()
{
@ -44,6 +50,10 @@ struct CmdEvalHydraJobs : MixJSON, MixDryRun, InstallableCommand
.description("garbage collector roots directory")
.labels({"path"})
.dest(&gcRootsDir);
mkIntFlag(0, "workers", "number of concurrent worker processes", &nrWorkers);
mkIntFlag(0, "max-memory-size", "maximum memory usage per worker process (in MiB)", &maxMemorySize);
}
std::string description() override
@ -61,11 +71,11 @@ struct CmdEvalHydraJobs : MixJSON, MixDryRun, InstallableCommand
};
}
void run(ref<Store> store) override
void worker(AutoCloseFD & to, AutoCloseFD & from)
{
auto state = getEvalState();
if (!gcRootsDir) warn("'--gc-roots-dir' not specified");
// FIXME: should re-open state->store.
if (dryRun) settings.readOnlyMode = true;
@ -73,118 +83,251 @@ struct CmdEvalHydraJobs : MixJSON, MixDryRun, InstallableCommand
to the environment. */
evalSettings.restrictEval = true;
auto v = installable->toValue(*state).first;
auto jsonObj = json ? std::make_unique<JSONObject>(std::cout, true) : nullptr;
std::function<void(Value & vIn, const string & attrPath)> findJobs;
auto autoArgs = getAutoArgs(*state);
findJobs = [&](Value & vIn, const string & attrPath)
{
auto vTop = installable->toValue(*state).first;
auto vRoot = state->allocValue();
state->autoCallFunction(*autoArgs, *vTop, *vRoot);
while (true) {
/* Wait for the master to send us a job name. */
writeLine(to.get(), "next");
auto s = readLine(from.get());
if (s == "exit") break;
if (!hasPrefix(s, "do ")) abort();
std::string attrPath(s, 3);
debug("worker process %d at '%s'", getpid(), attrPath);
/* Evaluate it and send info back to the master. */
nlohmann::json reply;
try {
Activity act(*logger, lvlInfo, actUnknown, fmt("evaluating '%s'", attrPath));
auto v = findAlongAttrPath(*state, attrPath, *autoArgs, *vRoot).first;
checkInterrupt();
state->forceValue(*v);
auto v = state->allocValue();
state->autoCallFunction(*autoArgs, vIn, *v);
if (auto drv = getDerivation(*state, *v, false)) {
if (v->type == tAttrs) {
auto drv = getDerivation(*state, *v, false);
DrvInfo::Outputs outputs = drv->queryOutputs();
if (drv) {
if (drv->querySystem() == "unknown")
throw EvalError("derivation must have a 'system' attribute");
DrvInfo::Outputs outputs = drv->queryOutputs();
auto drvPath = drv->queryDrvPath();
if (drv->querySystem() == "unknown")
throw EvalError("derivation must have a 'system' attribute");
nlohmann::json job;
auto drvPath = drv->queryDrvPath();
job["nixName"] = drv->queryName();
job["system"] =drv->querySystem();
job["drvPath"] = drvPath;
job["description"] = drv->queryMetaString("description");
job["license"] = queryMetaStrings(*state, *drv, "license", "shortName");
job["homepage"] = drv->queryMetaString("homepage");
job["maintainers"] = queryMetaStrings(*state, *drv, "maintainers", "email");
job["schedulingPriority"] = drv->queryMetaInt("schedulingPriority", 100);
job["timeout"] = drv->queryMetaInt("timeout", 36000);
job["maxSilent"] = drv->queryMetaInt("maxSilent", 7200);
job["isChannel"] = drv->queryMetaBool("isHydraChannel", false);
if (jsonObj) {
auto res = jsonObj->object(attrPath);
res.attr("nixName", drv->queryName());
res.attr("system", drv->querySystem());
res.attr("drvPath", drvPath);
res.attr("description", drv->queryMetaString("description"));
res.attr("license", queryMetaStrings(*state, *drv, "license", "shortName"));
res.attr("homepage", drv->queryMetaString("homepage"));
res.attr("maintainers", queryMetaStrings(*state, *drv, "maintainers", "email"));
res.attr("schedulingPriority", drv->queryMetaInt("schedulingPriority", 100));
res.attr("timeout", drv->queryMetaInt("timeout", 36000));
res.attr("maxSilent", drv->queryMetaInt("maxSilent", 7200));
res.attr("isChannel", drv->queryMetaBool("isHydraChannel", false));
/* If this is an aggregate, then get its constituents. */
auto a = v->attrs->get(state->symbols.create("_hydraAggregate"));
if (a && state->forceBool(*a->value, *a->pos)) {
auto a = v->attrs->get(state->symbols.create("constituents"));
if (!a)
throw EvalError("derivation must have a ‘constituents’ attribute");
PathSet context;
state->coerceToString(*a->pos, *a->value, context, true, false);
PathSet drvs;
for (auto & i : context)
if (i.at(0) == '!') {
size_t index = i.find("!", 1);
drvs.insert(string(i, index + 1));
}
res.attr("constituents", concatStringsSep(" ", drvs));
/* If this is an aggregate, then get its constituents. */
auto a = v->attrs->get(state->symbols.create("_hydraAggregate"));
if (a && state->forceBool(*a->value, *a->pos)) {
auto a = v->attrs->get(state->symbols.create("constituents"));
if (!a)
throw EvalError("derivation must have a ‘constituents’ attribute");
PathSet context;
state->coerceToString(*a->pos, *a->value, context, true, false);
PathSet drvs;
for (auto & i : context)
if (i.at(0) == '!') {
size_t index = i.find("!", 1);
drvs.insert(string(i, index + 1));
}
/* Register the derivation as a GC root. !!! This
registers roots for jobs that we may have already
done. */
auto localStore = state->store.dynamic_pointer_cast<LocalFSStore>();
if (gcRootsDir && localStore) {
Path root = *gcRootsDir + "/" + std::string(baseNameOf(drvPath));
if (!pathExists(root))
localStore->addPermRoot(localStore->parseStorePath(drvPath), root, false);
}
auto res2 = res.object("outputs");
for (auto & j : outputs)
res2.attr(j.first, j.second);
} else
std::cout << fmt("%d: %d\n", attrPath, drvPath);
job["constituents"] = concatStringsSep(" ", drvs);
}
else {
if (!state->isDerivation(*v)) {
for (auto & i : v->attrs->lexicographicOrder()) {
std::string name(i->name);
/* Register the derivation as a GC root. !!! This
registers roots for jobs that we may have already
done. */
auto localStore = state->store.dynamic_pointer_cast<LocalFSStore>();
if (gcRootsDir && localStore) {
Path root = *gcRootsDir + "/" + std::string(baseNameOf(drvPath));
if (!pathExists(root))
localStore->addPermRoot(localStore->parseStorePath(drvPath), root, false);
}
/* Skip jobs with dots in the name. */
if (name.find('.') != std::string::npos) {
printError("skipping job with illegal name '%s'", name);
continue;
}
nlohmann::json out;
for (auto & j : outputs)
out[j.first] = j.second;
job["outputs"] = std::move(out);
findJobs(*i->value, (attrPath.empty() ? "" : attrPath + ".") + name);
}
reply["job"] = std::move(job);
}
else if (v->type == tAttrs) {
auto attrs = nlohmann::json::array();
StringSet ss;
for (auto & i : v->attrs->lexicographicOrder()) {
std::string name(i->name);
if (name.find('.') != std::string::npos || name.find(' ') != std::string::npos) {
printError("skipping job with illegal name '%s'", name);
continue;
}
attrs.push_back(name);
}
reply["attrs"] = std::move(attrs);
}
else if (v->type == tNull) {
// allow null values, meaning 'do nothing'
}
else
throw TypeError("unsupported value: %s", *v);
} catch (EvalError & e) {
if (jsonObj)
jsonObj->object(attrPath).attr("error", filterANSIEscapes(e.msg(), true));
else
printError("in job '%s': %s", attrPath, e.what());
reply["error"] = filterANSIEscapes(e.msg(), true);
}
writeLine(to.get(), reply.dump());
/* If our RSS exceeds the maximum, exit. The master will
start a new process. */
struct rusage r;
getrusage(RUSAGE_SELF, &r);
if ((size_t) r.ru_maxrss > maxMemorySize * 1024) break;
}
writeLine(to.get(), "restart");
}
void run(ref<Store> store) override
{
if (!gcRootsDir) warn("'--gc-roots-dir' not specified");
struct State
{
std::set<std::string> todo{""};
std::set<std::string> active;
nlohmann::json result;
};
std::condition_variable wakeup;
Sync<State> state_;
/* Start a handler thread per worker process. */
auto handler = [this, &state_, &wakeup]()
{
try {
pid_t pid = -1;
AutoCloseFD from, to;
while (true) {
/* Start a new worker process if necessary. */
if (pid == -1) {
Pipe toPipe, fromPipe;
toPipe.create();
fromPipe.create();
pid = startProcess(
[this,
to{std::make_shared<AutoCloseFD>(std::move(fromPipe.writeSide))},
from{std::make_shared<AutoCloseFD>(std::move(toPipe.readSide))}
]()
{
try {
worker(*to, *from);
} catch (Error & e) {
printError("unexpected worker error: %s", e.msg());
_exit(1);
}
},
ProcessOptions { .allowVfork = false });
from = std::move(fromPipe.readSide);
to = std::move(toPipe.writeSide);
debug("created worker process %d", pid);
}
/* Check whether the existing worker process is still there. */
auto s = readLine(from.get());
if (s == "restart") {
pid = -1;
continue;
} else if (s != "next")
throw Error("unexpected worker request: %s", s);
/* Wait for a job name to become available. */
std::string attrPath;
while (true) {
checkInterrupt();
auto state(state_.lock());
if (state->todo.empty() && state->active.empty()) {
writeLine(to.get(), "exit");
return;
}
if (!state->todo.empty()) {
attrPath = *state->todo.begin();
state->todo.erase(state->todo.begin());
state->active.insert(attrPath);
break;
} else
state.wait(wakeup);
}
/* Tell the worker to evaluate it. */
writeLine(to.get(), "do " + attrPath);
/* Wait for the response. */
auto response = nlohmann::json::parse(readLine(from.get()));
/* Handle the response. */
StringSet newAttrs;
if (response.find("job") != response.end()) {
auto state(state_.lock());
if (json)
state->result[attrPath] = response["job"];
else
std::cout << fmt("%d: %d\n", attrPath, (std::string) response["job"]["drvPath"]);
}
if (response.find("attrs") != response.end()) {
for (auto & i : response["attrs"]) {
auto s = (attrPath.empty() ? "" : attrPath + ".") + (std::string) i;
newAttrs.insert(s);
}
}
if (response.find("error") != response.end()) {
auto state(state_.lock());
if (json)
state->result[attrPath]["error"] = response["error"];
else
printError("error in job '%s': %s",
attrPath, (std::string) response["error"]);
}
/* Add newly discovered job names to the queue. */
{
auto state(state_.lock());
state->active.erase(attrPath);
for (auto & s : newAttrs)
state->todo.insert(s);
wakeup.notify_all();
}
}
} catch (Error & e) {
printError("unexpected handler thread error: %s", e.msg());
abort();
}
};
findJobs(*v, "");
std::vector<std::thread> threads;
for (size_t i = 0; i < nrWorkers; i++)
threads.emplace_back(std::thread(handler));
for (auto & thread : threads)
thread.join();
if (json) std::cout << state_.lock()->result.dump(2) << "\n";
}
};