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Move path info caching from BinaryCacheStore to Store

Browse source 
Caching path info is generally useful. For instance, it speeds up "nix
path-info -rS /run/current-system" (i.e. showing the closure sizes of
all paths in the closure of the current system) from 5.6s to 0.15s.

This also eliminates some APIs like Store::queryDeriver() and
Store::queryReferences().
This commit is contained in:
Eelco Dolstra 2016-04-19 18:50:15 +02:00
parent 608b0265e1
commit e0204f8d46
21 changed files with 318 additions and 353 deletions
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62
src/libstore/store-api.cc
View file

@ -225,10 +225,48 @@ Path computeStorePathForText(const string & name, const string & s,
}
void Store::queryReferences(const Path & path, PathSet & references)
bool Store::isValidPath(const Path & storePath)
{
ValidPathInfo info = queryPathInfo(path);
references.insert(info.references.begin(), info.references.end());
{
auto state_(state.lock());
auto res = state_->pathInfoCache.get(storePath);
if (res) {
stats.narInfoReadAverted++;
return *res != 0;
}
}
return isValidPathUncached(storePath);
}
ref<const ValidPathInfo> Store::queryPathInfo(const Path & storePath)
{
{
auto state_(state.lock());
auto res = state_->pathInfoCache.get(storePath);
if (res) {
stats.narInfoReadAverted++;
if (!*res)
throw InvalidPath(format("path ‘%s’ is not valid") % storePath);
return ref<ValidPathInfo>(*res);
}
}
auto info = queryPathInfoUncached(storePath);
{
auto state_(state.lock());
state_->pathInfoCache.upsert(storePath, info);
stats.pathInfoCacheSize = state_->pathInfoCache.size();
}
if (!info) {
stats.narInfoMissing++;
throw InvalidPath(format("path ‘%s’ is not valid") % storePath);
}
return ref<ValidPathInfo>(info);
}
@ -243,19 +281,19 @@ string Store::makeValidityRegistration(const PathSet & paths,
for (auto & i : paths) {
s += i + "\n";
ValidPathInfo info = queryPathInfo(i);
auto info = queryPathInfo(i);
if (showHash) {
s += printHash(info.narHash) + "\n";
s += (format("%1%\n") % info.narSize).str();
s += printHash(info->narHash) + "\n";
s += (format("%1%\n") % info->narSize).str();
}
Path deriver = showDerivers ? info.deriver : "";
Path deriver = showDerivers ? info->deriver : "";
s += deriver + "\n";
s += (format("%1%\n") % info.references.size()).str();
s += (format("%1%\n") % info->references.size()).str();
for (auto & j : info.references)
for (auto & j : info->references)
s += j + "\n";
}
@ -263,6 +301,12 @@ string Store::makeValidityRegistration(const PathSet & paths,
}
const Store::Stats & Store::getStats()
{
return stats;
}
ValidPathInfo decodeValidPathInfo(std::istream & str, bool hashGiven)
{
ValidPathInfo info;