QBdtHybrid improvements and cleanup

QBdtHybrid benchmarks have been improved, and some basic housekeeping has been done in code.

(Note that releases 9.3.0 through 9.3.2 are the same code but built for 3 different Ubuntu distributions, semantically. Sorry for any potential confusion, about ARM64.)

SHA256 sums:

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CPU state vector init/copy parallelism (and C++23)

In the compiled release, CPU state vector initialization and copying has been parallelized. (In source code, pre-release support for C++23 has been added.)

SHA256 sums:
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Qrack v9 API

This is the first official release of Qrack v9 API (outside of the Ubuntu PPA, ppa:wrathfulspatula/vm6502q). The build targets available in this release are the new build targets for Qrack v9 and forward.

SHA-256 sums:
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QBdtHybrid

While we've tried various "hybridizations" of quantum binary decision diagrams (QBDD) with state vector simulation and other methods in the past, they as of yet have not given any compelling practical advantages in general use cases, as best the Qrack team can assess.

Trying a slightly different approach with the new QBdtHybrid, this might remain the case, like for the quantum Fourier transform or random circuit sampling. However, holistic integration with the overall "layer stack" seems significantly improved, with this approach, and special-case advantages might have improved. (We still need to collect additional benchmark data, to test this.)

File SHA-1 sums:

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What's Changed

• QBdtHybrid by @WrathfulSpatula in #998

Full Changelog: vm6502q.v8.20.1...vm6502q.v8.21.0

Debug QUnitMulti for heterogeneous devices

This patch release debugs QUnitMulti for heterogeneous OpenCL devices. Note that this is the first ever release with CMake -DUINTPOW=5 option, hence you will need to recompile your OpenCL kernels, if you use "pre-compilation." -DUINTPOW=5 limits QPager "page" width to 31 qubits or less, but this is literally larger than the maximum allocation segment of an A100 GPU, and this has no impact on multi-GPU scaling, hence there should be no new limitations so long as environment variable QRACK_MAX_PAGE_QB is set to 31 or less, (and most systems, including the A100, will typically want to set this variable even lower.)

With this release, interoperability between NVIDIA GPU and Intel HD integrated graphics can offer significant speed advantages on quantum volume circuits, for example. For a gaming laptop with two OpenCL devices, an Intel HD (device number 0) and an RTX 3080 (device number 1), here is an example of how the environment variable might be set:

export QRACK_OCL_DEFAULT_DEVICE=1
export QRACK_MAX_PAGE_QB=27
export QRACK_QUNITMULTI_DEVICES=1,0
export QRACK_QUNITMULTI_DEVICES_MAX_QB=-1,15
export QRACK_QPAGER_DEVICES=8.1,24.0
export QRACK_QPAGER_DEVICES_HOST_POINTER=8.0,24.1
export QRACK_MAX_ALLOC_MB=24576,16108
export QRACK_MAX_PAGING_QB=32
export QRACK_MAX_CPU_QB=32
export QRACK_QTENSORNETWORK_THRESHOLD_QB=32
# These commented variables might also be tuned for performance and approximation
# export QRACK_PSTRIDEPOW=11
# export QRACK_QUNIT_SEPARABILITY_THRESHOLD=0.00001
# export QRACK_QBDT_SEPARABILITY_THRESHOLD=0.00001
# export QRACK_NONCLIFFORD_ROUNDING_THRESHOLD=1

File SHA-1 sums:

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QRACK_QUNITMULTI_DEVICES_MAX_QB

This feature release adds the QRACK_QUNITMULTI_DEVICES_MAX_QB environment variable. Per device, as listed and ordered in QRACK_QUNITMULTI_DEVICES, this new variable allows the user to specify a maximum subsystem qubit width, above which no larger subsystem will be allocated on the particular device. This is particularly useful for combining OpenCL CPUs with OpenCL GPUs and other accelerators, since CPUs can give a significant advantage but are best suited for lower parallelism widths than GPUs.

File SHA-1 sums:

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Clifford+RZ under QTensorNetwork

QCircuit now exposes a bool constructor options that, if true, only "simplifies" Clifford-with-Clifford and non-Clifford-with-non-Clifford gates, but not Clifford-with-non-Clifford. QTensorNetwork automatically leverages this option when QStabilizerHybrid is in use, as in default "layer stack" case. (Some circuits still might complete more efficiently without QStabilizerHybrid.)

File SHA-1 sums:

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Minor MAll() improvement; precision "bugfix"

For CPU-based and OpenCL-based back ends, a minor improvement has been made in the algorithm of MAll(), such that single-shot simulation might see a small average-case performance benefit.

Also, Qrack's intention was always that internal "epsilon" for n bit precision was 2^-(n+1); these values were accidentally set much lower. (The change has been tested with the "normalization" features of Qrack, which are basically all this change should affect, and it works.)

File SHA-1 sums:

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2cc571ae04a2e17f7cdd0db4d1b35088426e5631 qrack_windows_x86_benchmarks.exe
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[UPDATE 2023-10-02: The WebAssembly build suffered from a bug related to serial builds of QBdt. This bug affects no other artifacts. Only Emscripten builds have been updated.

old hash: 80892b82ac9a7f88cfd28e171ea8b86f494e42ba Qrack-8.18.4-Emscripten.sh
new hash: 741eb3f8590906157105ad7a3f1ed7e5768af1ff Qrack-8.18.4-Emscripten.sh]

Full Changelog: vm6502qv8.18.3...vm6502qv8.18.4

Synchronous QTensorNetwork

QTensorNetwork has been changed from asynchronous (for gate dispatch without output) to synchronous (with threading for QCircuit, but with usual QInterface threading). This should fix segmentation faults with no major performance drawbacks.

File SHA-1 sums:

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QCircuit/QTensorNetwork async safety; QTensorNetwork GetUnitaryFidelity()

The thread safety of QCircuit asynchronous dispatch (as in QTensorNetwork) has been debugged. Also, GetUnitaryFidelity() has been patched through QTensorNetwork from an underlying QUnit simulator instance.

File SHA-1 sums:

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3f75b6c987ce0e30d5dd647b89bd9bb4a52c3df9 qrack_mac_x86-64_benchmarks
22da00a5bf7b23cf5d6b5787d1841f53e3bc49dc qrack_Ubuntu_20.04_LTS_benchmarks
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3bbf1bd6adbd3770d30fe001d4c1c828d9cbcb5d qrack_windows_x86-64_benchmarks.exe
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51c8c30681aed02843249730f07b509ce5141ab5 qrack_WSL_Ubuntu_22.04_LTS_benchmarks

(EDIT: Ubuntu 20.04 LTS version, only, was initially released incorrectly and needed to be corrected, above.)

Full Changelog: vm6502qv8.18.1...vm6502qv8.18.2