Can now provide reference iostore containers to reuse compressed chunks from. If a match is found on *the decompressed data*, instead of recompressing the blocks, they are read off of disk. This allows tweaks of the compressor algorithm without introducing changes as the runtime still sees the exact same data. Additionally this allows for fairly dramatic staging speedups as nvme speeds are significantly faster than high effort compressions. This is distinct from the DDC compression because:
1) DDC compression ties in the compressor version/method
2) We are explicitly interested in chunks that are deployed to end users, not merely cached for speed.
To facilitate this, several changes were made to IoStore:
FIoStoreReader now directly reads from IFileHandles* instead of routing through the GenericPlatformFile async read system, as that system is sensitive to build #defines and can result in constant file opens under load (indeed, for anything not a .pak file, every read is an open/close).
Cold file cache read speed improvements from ~140MB/s to ~1 GB/s. Hot is more.
Additionally:
FIoStoreReader switched to UE::Tasks from taskgraph for tasks in order to facilitate task retraction during waits as the previous ReadAsync call was trivial to deadlock when called from worker threads due to its use of TFuture<>.
FIoStoreReader::ReadCompressed now returns the compressed blocks as they were on disk - padded to AES encryption block size.
#rb fabian.giesen
#rb jeff.roberts
#preflight 627586dcf77c9c2b543d4d8b
[CL 20086673 by Dan Thompson in ue5-main branch]
-- Shaders must be sorted prior to inlining, as they are inserted in to a sorted list.
-- Break ties sorting shaders on disk with chunkid (hash)
-- Sort the shader map hashes in the package store entry
-- Pick the lowest LoadOrderFactor instead of the first for shaders that are used in more than one package.
-- Fix -WriteFinalOrder to actually write the final order as well as all chunks.
#rb fabian.giesen, charles.bloom
#preflight 627441a7de15651eeb416fbf
[CL 20065025 by Dan Thompson in ue5-main branch]
LoadDisplayNames() 1.06s -> 0.24s when async loading the name batch in CachedAssetRegistry.bin during editor startup of an internal project
* Introduce FDisplayNameEntryId to avoid cache misses in FName::GetComparisonIdFromDisplayId() lookups
* Force name batch serialization to use display entry ids to help enforce cooking determinism
* Fix determinism problem when loading then saving via FPackageStoreNameMapBuilder
* Inline FNameEntryId::FromUnstableInt()
* Remove slow IsNumbered() check in CreateFromDisplayId when not using 4B FName
* Remove expensive heap sort by sorting up front instead
#rb rob.millar,matt.peters,pj.kack
#preflight 62664bd06968f18d5137d419
[CL 19899104 by Johan Torp in ue5-main branch]
FIoDispatcher::IsInitialized() will now return true if it exists (which is almost always)
Renamed FArchive::IsUsingEventDrivenLoader() to IsLoadingFromCookedPackage and based it on the PKG_Cooked flag
#rnx
#rb pj.kack
#preflight 61f3ab6f74510448a6740570
#ROBOMERGE-AUTHOR: carlmagnus.nordin
#ROBOMERGE-SOURCE: CL 18769198 in //UE5/Release-5.0/... via CL 18769204 via CL 18769272
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v903-18687472)
[CL 18769277 by carlmagnus nordin in ue5-main branch]
Add support for importing uncooked source packages from cooked packages
#rnx
#jira UE-136265, FORT-426538
#rb pj.kack
#preflight 61e6ff6a3778a195debba826
#ROBOMERGE-OWNER: marc.audy
#ROBOMERGE-AUTHOR: carlmagnus.nordin
#ROBOMERGE-SOURCE: CL 18655480 via CL 18664834 via CL 18665656 via CL 18665916 via CL 18667722 via CL 18667764 via CL 18668174
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v901-18665521)
[CL 18668352 by marc audy in ue5-main branch]
Support for Zen store will be added separately
#jira UE-129805
#rb CarlMagnus.Nordin, Matt.Peters
#preflight 61e6f8d73778a195debaffa6
#ROBOMERGE-AUTHOR: francis.hurteau
#ROBOMERGE-SOURCE: CL 18642382 in //UE5/Release-5.0/... via CL 18642393 via CL 18642414
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v900-18638592)
[CL 18642448 by francis hurteau in ue5-main branch]
This represents UE4/Main @18073326, Release-5.0 @18081140 and Dev-PerfTest @18045971
[CL 18081471 by aurel cordonnier in ue5-release-engine-test branch]
This represents UE4/Main @17911760, Release-5.0 @17915875 and Dev-PerfTest @17914035
[CL 17918595 by aurel cordonnier in ue5-release-engine-test branch]
This represents UE4/Main @17774255, Release-5.0 @17791557 and Dev-PerfTest @17789485
[CL 17794212 by aurel cordonnier in ue5-release-engine-test branch]
* Decouple container concept from IoDispatcher
* Decoiuple PackageStore implementation from AsyncLoading2
* Restore ucas unmount fix that got kist when merrging from UE4
* Fix packages being left in the PackageStiore even after unmounting contaiiners
#rnx
#rb pj.kack, per.larsson
#preflight 61520cc52afc2d0001146ce7
#ROBOMERGE-AUTHOR: carlmagnus.nordin
#ROBOMERGE-SOURCE: CL 17641845 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v874-17637634)
[CL 17642353 by carlmagnus nordin in ue5-release-engine-test branch]
Serialization and the FBuildDefinition type of derived data have not been implemented yet. This version is functional in the editor when used with buffers or unstructured cache keys.
#rb Zousar.Shaker
#preflight 614cdb35c2ef060001f6425b
#ROBOMERGE-AUTHOR: devin.doucette
#ROBOMERGE-SOURCE: CL 17614269 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v871-17566257)
[CL 17614332 by devin doucette in ue5-release-engine-test branch]
