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Merge pull request #6612 from NixOS/parallel-nix-copy 

Make nix copy parallel again
This commit is contained in:
Eelco Dolstra 2022-08-24 15:31:42 +02:00 committed by GitHub
parent a1e1ec3dad 56d97d4b4d
commit 04e74f7c8b
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5 changed files with 156 additions and 93 deletions
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3
doc/manual/src/release-notes/rl-next.md
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@ -1,2 +1,5 @@
# Release X.Y (202?-??-??)
* `nix copy` now copies the store paths in parallel as much as possible (again).
This doesn't apply for the `daemon` and `ssh-ng` stores which copy everything
in one batch to avoid latencies issues.

17
src/libstore/remote-store.cc
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@ -671,6 +671,23 @@ void RemoteStore::addToStore(const ValidPathInfo & info, Source & source,
}
void RemoteStore::addMultipleToStore(
PathsSource & pathsToCopy,
Activity & act,
RepairFlag repair,
CheckSigsFlag checkSigs)
{
auto source = sinkToSource([&](Sink & sink) {
sink << pathsToCopy.size();
for (auto & [pathInfo, pathSource] : pathsToCopy) {
pathInfo.write(sink, *this, 16);
pathSource->drainInto(sink);
}
});
addMultipleToStore(*source, repair, checkSigs);
}
void RemoteStore::addMultipleToStore(
Source & source,
RepairFlag repair,

6
src/libstore/remote-store.hh
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@ -88,6 +88,12 @@ public:
RepairFlag repair,
CheckSigsFlag checkSigs) override;
void addMultipleToStore(
PathsSource & pathsToCopy,
Activity & act,
RepairFlag repair,
CheckSigsFlag checkSigs) override;
StorePath addTextToStore(
std::string_view name,
std::string_view s,

212
src/libstore/store-api.cc
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@ -258,6 +258,84 @@ StorePath Store::addToStore(
return addToStoreFromDump(*source, name, method, hashAlgo, repair, references);
}
void Store::addMultipleToStore(
PathsSource & pathsToCopy,
Activity & act,
RepairFlag repair,
CheckSigsFlag checkSigs)
{
std::atomic<size_t> nrDone{0};
std::atomic<size_t> nrFailed{0};
std::atomic<uint64_t> bytesExpected{0};
std::atomic<uint64_t> nrRunning{0};
using PathWithInfo = std::pair<ValidPathInfo, std::unique_ptr<Source>>;
std::map<StorePath, PathWithInfo *> infosMap;
StorePathSet storePathsToAdd;
for (auto & thingToAdd : pathsToCopy) {
infosMap.insert_or_assign(thingToAdd.first.path, &thingToAdd);
storePathsToAdd.insert(thingToAdd.first.path);
}
auto showProgress = [&]() {
act.progress(nrDone, pathsToCopy.size(), nrRunning, nrFailed);
};
ThreadPool pool;
processGraph<StorePath>(pool,
storePathsToAdd,
[&](const StorePath & path) {
auto & [info, _] = *infosMap.at(path);
if (isValidPath(info.path)) {
nrDone++;
showProgress();
return StorePathSet();
}
bytesExpected += info.narSize;
act.setExpected(actCopyPath, bytesExpected);
return info.references;
},
[&](const StorePath & path) {
checkInterrupt();
auto & [info_, source_] = *infosMap.at(path);
auto info = info_;
info.ultimate = false;
/* Make sure that the Source object is destroyed when
we're done. In particular, a SinkToSource object must
be destroyed to ensure that the destructors on its
stack frame are run; this includes
LegacySSHStore::narFromPath()'s connection lock. */
auto source = std::move(source_);
if (!isValidPath(info.path)) {
MaintainCount<decltype(nrRunning)> mc(nrRunning);
showProgress();
try {
addToStore(info, *source, repair, checkSigs);
} catch (Error & e) {
nrFailed++;
if (!settings.keepGoing)
throw e;
printMsg(lvlError, "could not copy %s: %s", printStorePath(path), e.what());
showProgress();
return;
}
}
nrDone++;
showProgress();
});
}
void Store::addMultipleToStore(
Source & source,
@ -992,113 +1070,61 @@ std::map<StorePath, StorePath> copyPaths(
for (auto & path : storePaths)
if (!valid.count(path)) missing.insert(path);
Activity act(*logger, lvlInfo, actCopyPaths, fmt("copying %d paths", missing.size()));
// In the general case, `addMultipleToStore` requires a sorted list of
// store paths to add, so sort them right now
auto sortedMissing = srcStore.topoSortPaths(missing);
std::reverse(sortedMissing.begin(), sortedMissing.end());
std::map<StorePath, StorePath> pathsMap;
for (auto & path : storePaths)
pathsMap.insert_or_assign(path, path);
Activity act(*logger, lvlInfo, actCopyPaths, fmt("copying %d paths", missing.size()));
Store::PathsSource pathsToCopy;
auto sorted = srcStore.topoSortPaths(missing);
std::reverse(sorted.begin(), sorted.end());
auto computeStorePathForDst = [&](const ValidPathInfo & currentPathInfo) -> StorePath {
auto storePathForSrc = currentPathInfo.path;
auto storePathForDst = storePathForSrc;
if (currentPathInfo.ca && currentPathInfo.references.empty()) {
storePathForDst = dstStore.makeFixedOutputPathFromCA(storePathForSrc.name(), *currentPathInfo.ca);
if (dstStore.storeDir == srcStore.storeDir)
assert(storePathForDst == storePathForSrc);
if (storePathForDst != storePathForSrc)
debug("replaced path '%s' to '%s' for substituter '%s'",
srcStore.printStorePath(storePathForSrc),
dstStore.printStorePath(storePathForDst),
dstStore.getUri());
}
return storePathForDst;
};
auto source = sinkToSource([&](Sink & sink) {
sink << sorted.size();
for (auto & storePath : sorted) {
for (auto & missingPath : sortedMissing) {
auto info = srcStore.queryPathInfo(missingPath);
auto storePathForDst = computeStorePathForDst(*info);
pathsMap.insert_or_assign(missingPath, storePathForDst);
ValidPathInfo infoForDst = *info;
infoForDst.path = storePathForDst;
auto source = sinkToSource([&](Sink & sink) {
// We can reasonably assume that the copy will happen whenever we
// read the path, so log something about that at that point
auto srcUri = srcStore.getUri();
auto dstUri = dstStore.getUri();
auto storePathS = srcStore.printStorePath(storePath);
auto storePathS = srcStore.printStorePath(missingPath);
Activity act(*logger, lvlInfo, actCopyPath,
makeCopyPathMessage(srcUri, dstUri, storePathS),
{storePathS, srcUri, dstUri});
PushActivity pact(act.id);
auto info = srcStore.queryPathInfo(storePath);
info->write(sink, srcStore, 16);
srcStore.narFromPath(storePath, sink);
}
});
dstStore.addMultipleToStore(*source, repair, checkSigs);
#if 0
std::atomic<size_t> nrDone{0};
std::atomic<size_t> nrFailed{0};
std::atomic<uint64_t> bytesExpected{0};
std::atomic<uint64_t> nrRunning{0};
auto showProgress = [&]() {
act.progress(nrDone, missing.size(), nrRunning, nrFailed);
};
ThreadPool pool;
processGraph<StorePath>(pool,
StorePathSet(missing.begin(), missing.end()),
[&](const StorePath & storePath) {
auto info = srcStore.queryPathInfo(storePath);
auto storePathForDst = storePath;
if (info->ca && info->references.empty()) {
storePathForDst = dstStore.makeFixedOutputPathFromCA(storePath.name(), *info->ca);
if (dstStore.storeDir == srcStore.storeDir)
assert(storePathForDst == storePath);
if (storePathForDst != storePath)
debug("replaced path '%s' to '%s' for substituter '%s'",
srcStore.printStorePath(storePath),
dstStore.printStorePath(storePathForDst),
dstStore.getUri());
}
pathsMap.insert_or_assign(storePath, storePathForDst);
if (dstStore.isValidPath(storePath)) {
nrDone++;
showProgress();
return StorePathSet();
}
bytesExpected += info->narSize;
act.setExpected(actCopyPath, bytesExpected);
return info->references;
},
[&](const StorePath & storePath) {
checkInterrupt();
auto info = srcStore.queryPathInfo(storePath);
auto storePathForDst = storePath;
if (info->ca && info->references.empty()) {
storePathForDst = dstStore.makeFixedOutputPathFromCA(storePath.name(), *info->ca);
if (dstStore.storeDir == srcStore.storeDir)
assert(storePathForDst == storePath);
if (storePathForDst != storePath)
debug("replaced path '%s' to '%s' for substituter '%s'",
srcStore.printStorePath(storePath),
dstStore.printStorePath(storePathForDst),
dstStore.getUri());
}
pathsMap.insert_or_assign(storePath, storePathForDst);
if (!dstStore.isValidPath(storePathForDst)) {
MaintainCount<decltype(nrRunning)> mc(nrRunning);
showProgress();
try {
copyStorePath(srcStore, dstStore, storePath, repair, checkSigs);
} catch (Error &e) {
nrFailed++;
if (!settings.keepGoing)
throw e;
printMsg(lvlError, "could not copy %s: %s", dstStore.printStorePath(storePath), e.what());
showProgress();
return;
}
}
nrDone++;
showProgress();
srcStore.narFromPath(missingPath, sink);
});
#endif
pathsToCopy.push_back(std::pair{infoForDst, std::move(source)});
}
dstStore.addMultipleToStore(pathsToCopy, act, repair, checkSigs);
return pathsMap;
}

11
src/libstore/store-api.hh
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@ -1,5 +1,6 @@
#pragma once
#include "nar-info.hh"
#include "realisation.hh"
#include "path.hh"
#include "derived-path.hh"
@ -359,12 +360,22 @@ public:
virtual void addToStore(const ValidPathInfo & info, Source & narSource,
RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs) = 0;
// A list of paths infos along with a source providing the content of the
// associated store path
using PathsSource = std::vector<std::pair<ValidPathInfo, std::unique_ptr<Source>>>;
/* Import multiple paths into the store. */
virtual void addMultipleToStore(
Source & source,
RepairFlag repair = NoRepair,
CheckSigsFlag checkSigs = CheckSigs);
virtual void addMultipleToStore(
PathsSource & pathsToCopy,
Activity & act,
RepairFlag repair = NoRepair,
CheckSigsFlag checkSigs = CheckSigs);
/* Copy the contents of a path to the store and register the
validity the resulting path. The resulting path is returned.
The function object `filter' can be used to exclude files (see