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Benchmarks

The benchmarks are classified based on their characteristics and cover various aspects of system performance. Most are derived from the industry-standard BYTEmark (nbench) suite, supplemented by cryptographic and system benchmarks:

Benchmark Description
numeric sort Focuses on sorting integer arrays using various algorithms
string sort Evaluates string sorting capabilities
bitfield Tests bitwise operations and integer arithmetic on data words
emfloat Focuses on emulating floating-point calculations using integer arithmetic
assignment Tests solving resource allocation problems (e.g., assignment algorithm)
idea Assesses encryption and decryption using the International Data Encryption Algorithm (IDEA)
huffman Measures performance in data compression using Huffman coding
dhrystone Assesses general integer performance with a mix of string processing and control operations
primes Measures efficiency in computing prime numbers using algorithms like the Sieve of Eratosthenes
sha512 Tests cryptographic hash computations

These benchmarks were performed by rv32emu (with tiered JIT enabled) and QEMU v9.0.0 on an Intel Core i7-11700 CPU running at 2.5 GHz with Ubuntu Linux 22.04.1 LTS. The toolchain used was GCC v14.2.0 with RV32IM extensions.

The figure below illustrates the speedup (normalized reciprocal of average elapsed time over 200 iterations) of rv32emu with tiered JIT compilation compared to QEMU. Higher values indicate better performance.

Performance summary:

  • rv32emu with tiered JIT compilation outperforms QEMU v9.0.0 across all benchmarks
  • Significant performance gains in compute-intensive workloads (primes, sha512, emfloat)
  • Strong performance in optimization and cryptography benchmarks (assignment, idea, huffman)
  • Consistent advantages in sorting operations (numeric sort, string sort)
  • The tiered JIT approach effectively balances compilation overhead with code optimization quality

Continuous benchmarking

Continuous benchmarking is integrated into GitHub Actions, allowing the committer and reviewer to examine the comment on benchmark comparisons between the pull request commit(s) and the latest commit on the master branch within the conversation. This comment is generated by the benchmark CI and provides an opportunity for discussion before merging.

The results of the benchmark will be rendered on a GitHub page. Check benchmark-action/github-action-benchmark for the reference of benchmark CI workflow.

Modifications to any of the following paths trigger the benchmark CI (see .github/workflows/benchmark.yml for the authoritative list):

  • src/riscv.c
  • src/decode.c
  • src/emulate.c
  • src/rv32_template.c
  • src/rv32_constopt.c
  • src/cache.c
  • src/io.c
  • src/jit.c
  • mk/kconfig.mk
  • mk/toolchain.mk
  • tools/detect-env.py