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Wladimir J. van der Laan 4ebe2f6e75
Merge #18011: Replace current benchmarking framework with nanobench 
78c312c983 Replace current benchmarking framework with nanobench (Martin Ankerl)

Pull request description:

  Replace current benchmarking framework with nanobench

  This replaces the current benchmarking framework with nanobench [1], an
  MIT licensed single-header benchmarking library, of which I am the
  autor. This has in my opinion several advantages, especially on Linux:

  * fast: Running all benchmarks takes ~6 seconds instead of 4m13s on
    an Intel i7-8700 CPU @ 3.20GHz.

  * accurate: I ran e.g. the benchmark for SipHash_32b 10 times and
    calculate standard deviation / mean = coefficient of variation:

    * 0.57% CV for old benchmarking framework
    * 0.20% CV for nanobench

    So the benchmark results with nanobench seem to vary less than with
    the old framework.

  * It automatically determines runtime based on clock precision, no need
    to specify number of evaluations.

  * measure instructions, cycles, branches, instructions per cycle,
    branch misses (only Linux, when performance counters are available)

  * output in markdown table format.

  * Warn about unstable environment (frequency scaling, turbo, ...)

  * For better profiling, it is possible to set the environment variable
    NANOBENCH_ENDLESS to force endless running of a particular benchmark
    without the need to recompile. This makes it to e.g. run "perf top"
    and look at hotspots.

  Here is an example copy & pasted from the terminal output:

  |             ns/byte |              byte/s |    err% |        ins/byte |        cyc/byte |    IPC |       bra/byte |   miss% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
  |                2.52 |      396,529,415.94 |    0.6% |           25.42 |            8.02 |  3.169 |           0.06 |    0.0% |      0.03 | `bench/crypto_hash.cpp RIPEMD160`
  |                1.87 |      535,161,444.83 |    0.3% |           21.36 |            5.95 |  3.589 |           0.06 |    0.0% |      0.02 | `bench/crypto_hash.cpp SHA1`
  |                3.22 |      310,344,174.79 |    1.1% |           36.80 |           10.22 |  3.601 |           0.09 |    0.0% |      0.04 | `bench/crypto_hash.cpp SHA256`
  |                2.01 |      496,375,796.23 |    0.0% |           18.72 |            6.43 |  2.911 |           0.01 |    1.0% |      0.00 | `bench/crypto_hash.cpp SHA256D64_1024`
  |                7.23 |      138,263,519.35 |    0.1% |           82.66 |           23.11 |  3.577 |           1.63 |    0.1% |      0.00 | `bench/crypto_hash.cpp SHA256_32b`
  |                3.04 |      328,780,166.40 |    0.3% |           35.82 |            9.69 |  3.696 |           0.03 |    0.0% |      0.03 | `bench/crypto_hash.cpp SHA512`

  [1] https://github.com/martinus/nanobench

ACKs for top commit:
  laanwj:
    ACK 78c312c983

Tree-SHA512: 9e18770b18b6f95a7d0105a4a5497d31cf4eb5efe6574f4482f6f1b4c88d7e0946b9a4a1e9e8e6ecbf41a3f2d7571240677dcb45af29a6f0584e89b25f32e49e
2020-07-30 15:34:17 +02:00
..
debian doc: Update license year range to 2020 2019-12-26 23:11:21 +01:00
devtools Merge #18011: Replace current benchmarking framework with nanobench 2020-07-30 15:34:17 +02:00
gitian-descriptors macos: Bump to xcode 11.3.1 and 10.15 SDK 2020-06-22 10:14:33 -04:00
gitian-keys Merge #18619: gitian: add jonatack gpg key fingerprint 2020-04-15 15:38:02 +08:00
guix guix: Add clarifying documentation for V env var 2020-05-20 13:11:16 -04:00
init Merge #16569: Increase init file stop timeout 2019-10-08 11:38:44 +02:00
linearize scripted-diff: Bump copyright headers 2020-04-16 13:33:09 -04:00
macdeploy macos: Bump to xcode 11.3.1 and 10.15 SDK 2020-06-22 10:14:33 -04:00
qos scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
seeds scripted-diff: Bump copyright headers 2020-04-16 13:33:09 -04:00
testgen docs: match usage text to script and location 2020-06-21 10:31:18 +01:00
verify-commits scripted-diff: Bump copyright headers 2020-04-16 13:33:09 -04:00
verifybinaries scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
windeploy Update with new Windows code signing certificate 2020-03-24 12:22:46 -04:00
zmq build: Require python 3.5 2019-03-02 10:40:23 -05:00
bitcoin-cli.bash-completion scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
bitcoin-qt.pro Add CreateWalletDialog to create wallets from the GUI 2019-09-05 20:36:57 -04:00
bitcoin-tx.bash-completion
bitcoind.bash-completion scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
filter-lcov.py scripted-diff: Bump copyright headers 2020-04-16 13:33:09 -04:00
gitian-build.py macos: Bump to xcode 11.3.1 and 10.15 SDK 2020-06-22 10:14:33 -04:00
install_db4.sh scripted-diff: Add missed copyright headers 2020-01-04 20:18:28 +02:00
README.md doc: Fix whitespace errs in .md files, bitcoin.conf, Info.plist.in, and find_bdb48.m4 2019-09-17 03:21:22 -04:00
valgrind.supp test: Make valgrind.supp work on aarch64 2020-06-03 10:58:27 -04:00

README.md

Repository Tools

Developer tools

Specific tools for developers working on this repository. Additional tools, including the github-merge.py script, are available in the maintainer-tools repository.

Verify-Commits

Tool to verify that every merge commit was signed by a developer using the github-merge.py script.

Linearize

Construct a linear, no-fork, best version of the blockchain.

Qos

A Linux bash script that will set up traffic control (tc) to limit the outgoing bandwidth for connections to the Bitcoin network. This means one can have an always-on bitcoind instance running, and another local bitcoind/bitcoin-qt instance which connects to this node and receives blocks from it.

Seeds

Utility to generate the pnSeed[] array that is compiled into the client.

Build Tools and Keys

Packaging

The Debian subfolder contains the copyright file.

All other packaging related files can be found in the bitcoin-core/packaging repository.

Gitian-descriptors

Files used during the gitian build process. For more information about gitian, see the the Bitcoin Core documentation repository.

Gitian-keys

PGP keys used for signing Bitcoin Core Gitian release results.

MacDeploy

Scripts and notes for Mac builds.

Gitian-build

Script for running full Gitian builds.

Test and Verify Tools

TestGen

Utilities to generate test vectors for the data-driven Bitcoin tests.

Verify Binaries

This script attempts to download and verify the signature file SHA256SUMS.asc from bitcoin.org.