forked from lix-project/lix
Store::queryMissing(): Use a thread pool
For one particular NixOS configuration, this cut the runtime of "nix-store -r --dry-run" from 6m51s to 3.4s. It also fixes a bug in the size calculation that was causing certain paths to be counted twice, e.g. before: these paths will be fetched (1249.98 MiB download, 2995.74 MiB unpacked): and after: these paths will be fetched (1219.56 MiB download, 2862.17 MiB unpacked):
This commit is contained in:
Eelco Dolstra
parent
6f70fcd1c5
commit
d57981bac4
|
|
@ -72,116 +72,135 @@ void Store::computeFSClosure(const Path & path,
|
|||
|
||||
|
||||
void Store::queryMissing(const PathSet & targets,
|
||||
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
|
||||
unsigned long long & downloadSize, unsigned long long & narSize)
|
||||
PathSet & willBuild_, PathSet & willSubstitute_, PathSet & unknown_,
|
||||
unsigned long long & downloadSize_, unsigned long long & narSize_)
|
||||
{
|
||||
downloadSize = narSize = 0;
|
||||
downloadSize_ = narSize_ = 0;
|
||||
|
||||
PathSet todo(targets.begin(), targets.end()), done;
|
||||
ThreadPool pool;
|
||||
|
||||
/* Getting substitute info has high latency when using the binary
|
||||
cache substituter. Thus it's essential to do substitute
|
||||
queries in parallel as much as possible. To accomplish this
|
||||
we do the following:
|
||||
struct State
|
||||
{
|
||||
PathSet done;
|
||||
PathSet & unknown, & willSubstitute, & willBuild;
|
||||
unsigned long long & downloadSize;
|
||||
unsigned long long & narSize;
|
||||
};
|
||||
|
||||
- For all paths still to be processed (‘todo’), we add all
|
||||
paths for which we need info to the set ‘query’. For an
|
||||
unbuilt derivation this is the output paths; otherwise, it's
|
||||
the path itself.
|
||||
struct DrvState
|
||||
{
|
||||
size_t left;
|
||||
bool done = false;
|
||||
PathSet outPaths;
|
||||
DrvState(size_t left) : left(left) { }
|
||||
};
|
||||
|
||||
- We get info about all paths in ‘query’ in parallel.
|
||||
Sync<State> state_(State{PathSet(), unknown_, willSubstitute_, willBuild_, downloadSize_, narSize_});
|
||||
|
||||
- We process the results and add new items to ‘todo’ if
|
||||
necessary. E.g. if a path is substitutable, then we need to
|
||||
get info on its references.
|
||||
std::function<void(Path)> doPath;
|
||||
|
||||
- Repeat until ‘todo’ is empty.
|
||||
*/
|
||||
|
||||
while (!todo.empty()) {
|
||||
|
||||
PathSet query, todoDrv, todoNonDrv;
|
||||
|
||||
for (auto & i : todo) {
|
||||
if (done.find(i) != done.end()) continue;
|
||||
done.insert(i);
|
||||
|
||||
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(i);
|
||||
|
||||
if (isDerivation(i2.first)) {
|
||||
if (!isValidPath(i2.first)) {
|
||||
// FIXME: we could try to substitute p.
|
||||
unknown.insert(i);
|
||||
continue;
|
||||
}
|
||||
Derivation drv = derivationFromPath(i2.first);
|
||||
|
||||
PathSet invalid;
|
||||
for (auto & j : drv.outputs)
|
||||
if (wantOutput(j.first, i2.second)
|
||||
&& !isValidPath(j.second.path))
|
||||
invalid.insert(j.second.path);
|
||||
if (invalid.empty()) continue;
|
||||
|
||||
todoDrv.insert(i);
|
||||
if (settings.useSubstitutes && drv.substitutesAllowed())
|
||||
query.insert(invalid.begin(), invalid.end());
|
||||
}
|
||||
|
||||
else {
|
||||
if (isValidPath(i)) continue;
|
||||
query.insert(i);
|
||||
todoNonDrv.insert(i);
|
||||
}
|
||||
auto mustBuildDrv = [&](const Path & drvPath, const Derivation & drv) {
|
||||
{
|
||||
auto state(state_.lock());
|
||||
state->willBuild.insert(drvPath);
|
||||
}
|
||||
|
||||
todo.clear();
|
||||
for (auto & i : drv.inputDrvs)
|
||||
pool.enqueue(std::bind(doPath, makeDrvPathWithOutputs(i.first, i.second)));
|
||||
};
|
||||
|
||||
auto checkOutput = [&](
|
||||
const Path & drvPath, ref<Derivation> drv, const Path & outPath, ref<Sync<DrvState>> drvState_)
|
||||
{
|
||||
if (drvState_->lock()->done) return;
|
||||
|
||||
SubstitutablePathInfos infos;
|
||||
querySubstitutablePathInfos(query, infos);
|
||||
querySubstitutablePathInfos({outPath}, infos);
|
||||
|
||||
for (auto & i : todoDrv) {
|
||||
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(i);
|
||||
if (infos.empty()) {
|
||||
drvState_->lock()->done = true;
|
||||
mustBuildDrv(drvPath, *drv);
|
||||
} else {
|
||||
{
|
||||
auto drvState(drvState_->lock());
|
||||
if (drvState->done) return;
|
||||
assert(drvState->left);
|
||||
drvState->left--;
|
||||
drvState->outPaths.insert(outPath);
|
||||
if (!drvState->left) {
|
||||
for (auto & path : drvState->outPaths)
|
||||
pool.enqueue(std::bind(doPath, path));
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
doPath = [&](const Path & path) {
|
||||
|
||||
{
|
||||
auto state(state_.lock());
|
||||
if (state->done.count(path)) return;
|
||||
state->done.insert(path);
|
||||
}
|
||||
|
||||
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(path);
|
||||
|
||||
if (isDerivation(i2.first)) {
|
||||
if (!isValidPath(i2.first)) {
|
||||
// FIXME: we could try to substitute the derivation.
|
||||
auto state(state_.lock());
|
||||
state->unknown.insert(path);
|
||||
return;
|
||||
}
|
||||
|
||||
// FIXME: cache this
|
||||
Derivation drv = derivationFromPath(i2.first);
|
||||
|
||||
PathSet outputs;
|
||||
bool mustBuild = false;
|
||||
PathSet invalid;
|
||||
for (auto & j : drv.outputs)
|
||||
if (wantOutput(j.first, i2.second)
|
||||
&& !isValidPath(j.second.path))
|
||||
invalid.insert(j.second.path);
|
||||
if (invalid.empty()) return;
|
||||
|
||||
if (settings.useSubstitutes && drv.substitutesAllowed()) {
|
||||
for (auto & j : drv.outputs) {
|
||||
if (!wantOutput(j.first, i2.second)) continue;
|
||||
if (!isValidPath(j.second.path)) {
|
||||
if (infos.find(j.second.path) == infos.end())
|
||||
mustBuild = true;
|
||||
else
|
||||
outputs.insert(j.second.path);
|
||||
}
|
||||
}
|
||||
auto drvState = make_ref<Sync<DrvState>>(DrvState(invalid.size()));
|
||||
for (auto & output : invalid)
|
||||
pool.enqueue(std::bind(checkOutput, i2.first, make_ref<Derivation>(drv), output, drvState));
|
||||
} else
|
||||
mustBuild = true;
|
||||
mustBuildDrv(i2.first, drv);
|
||||
|
||||
if (mustBuild) {
|
||||
willBuild.insert(i2.first);
|
||||
todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
|
||||
for (auto & j : drv.inputDrvs)
|
||||
todo.insert(makeDrvPathWithOutputs(j.first, j.second));
|
||||
} else
|
||||
todoNonDrv.insert(outputs.begin(), outputs.end());
|
||||
}
|
||||
} else {
|
||||
|
||||
for (auto & i : todoNonDrv) {
|
||||
done.insert(i);
|
||||
SubstitutablePathInfos::iterator info = infos.find(i);
|
||||
if (info != infos.end()) {
|
||||
willSubstitute.insert(i);
|
||||
downloadSize += info->second.downloadSize;
|
||||
narSize += info->second.narSize;
|
||||
todo.insert(info->second.references.begin(), info->second.references.end());
|
||||
} else
|
||||
unknown.insert(i);
|
||||
if (isValidPath(path)) return;
|
||||
|
||||
SubstitutablePathInfos infos;
|
||||
querySubstitutablePathInfos({path}, infos);
|
||||
|
||||
if (infos.empty()) {
|
||||
auto state(state_.lock());
|
||||
state->unknown.insert(path);
|
||||
return;
|
||||
}
|
||||
|
||||
auto info = infos.find(path);
|
||||
assert(info != infos.end());
|
||||
|
||||
{
|
||||
auto state(state_.lock());
|
||||
state->willSubstitute.insert(path);
|
||||
state->downloadSize += info->second.downloadSize;
|
||||
state->narSize += info->second.narSize;
|
||||
}
|
||||
|
||||
for (auto & ref : info->second.references)
|
||||
pool.enqueue(std::bind(doPath, ref));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
for (auto & path : targets)
|
||||
pool.enqueue(std::bind(doPath, path));
|
||||
|
||||
pool.process();
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue