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Pre-allocate collections during program deserialization #2309

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@gabrielbosio gabrielbosio commented Jan 23, 2026

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perf: pre-allocate collections during program deserialization
c2150df 
- Pre-allocate Vec in MaybeRelocatableVisitor::visit_seq using size_hint
- Pre-allocate HashMap in ReferenceIdsVisitor::visit_map using size_hint
- Remove redundant .to_string() call when value is already a String

This reduces allocation overhead during JSON program deserialization.
Benchmark shows ~5% improvement in initialize time.
@gabrielbosio gabrielbosio added the performance Performance-related improvements or regressions label Jan 23, 2026
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github-actions bot commented Jan 23, 2026 •
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**Hyper Thereading Benchmark results**




hyperfine -r 2 -n "hyper_threading_main threads: 1" 'RAYON_NUM_THREADS=1 ./hyper_threading_main' -n "hyper_threading_pr threads: 1" 'RAYON_NUM_THREADS=1 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 1
  Time (mean ± σ):     23.244 s ±  0.100 s    [User: 22.403 s, System: 0.839 s]
  Range (min … max):   23.173 s … 23.315 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 1
  Time (mean ± σ):     23.007 s ±  0.085 s    [User: 22.206 s, System: 0.798 s]
  Range (min … max):   22.946 s … 23.067 s    2 runs
 
Summary
  hyper_threading_pr threads: 1 ran
    1.01 ± 0.01 times faster than hyper_threading_main threads: 1




hyperfine -r 2 -n "hyper_threading_main threads: 2" 'RAYON_NUM_THREADS=2 ./hyper_threading_main' -n "hyper_threading_pr threads: 2" 'RAYON_NUM_THREADS=2 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 2
  Time (mean ± σ):     12.458 s ±  0.047 s    [User: 22.463 s, System: 0.851 s]
  Range (min … max):   12.425 s … 12.491 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 2
  Time (mean ± σ):     12.484 s ±  0.186 s    [User: 22.419 s, System: 0.860 s]
  Range (min … max):   12.353 s … 12.616 s    2 runs
 
Summary
  hyper_threading_main threads: 2 ran
    1.00 ± 0.02 times faster than hyper_threading_pr threads: 2




hyperfine -r 2 -n "hyper_threading_main threads: 4" 'RAYON_NUM_THREADS=4 ./hyper_threading_main' -n "hyper_threading_pr threads: 4" 'RAYON_NUM_THREADS=4 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 4
  Time (mean ± σ):      9.835 s ±  0.246 s    [User: 34.949 s, System: 1.061 s]
  Range (min … max):    9.661 s … 10.009 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 4
  Time (mean ± σ):     10.038 s ±  0.222 s    [User: 35.072 s, System: 1.027 s]
  Range (min … max):    9.881 s … 10.195 s    2 runs
 
Summary
  hyper_threading_main threads: 4 ran
    1.02 ± 0.03 times faster than hyper_threading_pr threads: 4




hyperfine -r 2 -n "hyper_threading_main threads: 6" 'RAYON_NUM_THREADS=6 ./hyper_threading_main' -n "hyper_threading_pr threads: 6" 'RAYON_NUM_THREADS=6 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 6
  Time (mean ± σ):      9.574 s ±  0.007 s    [User: 35.116 s, System: 1.010 s]
  Range (min … max):    9.569 s …  9.579 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 6
  Time (mean ± σ):      9.767 s ±  0.472 s    [User: 35.465 s, System: 1.011 s]
  Range (min … max):    9.433 s … 10.100 s    2 runs
 
Summary
  hyper_threading_main threads: 6 ran
    1.02 ± 0.05 times faster than hyper_threading_pr threads: 6




hyperfine -r 2 -n "hyper_threading_main threads: 8" 'RAYON_NUM_THREADS=8 ./hyper_threading_main' -n "hyper_threading_pr threads: 8" 'RAYON_NUM_THREADS=8 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 8
  Time (mean ± σ):      9.540 s ±  0.006 s    [User: 35.616 s, System: 1.065 s]
  Range (min … max):    9.536 s …  9.544 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 8
  Time (mean ± σ):      9.568 s ±  0.061 s    [User: 35.860 s, System: 1.076 s]
  Range (min … max):    9.524 s …  9.611 s    2 runs
 
Summary
  hyper_threading_main threads: 8 ran
    1.00 ± 0.01 times faster than hyper_threading_pr threads: 8




hyperfine -r 2 -n "hyper_threading_main threads: 16" 'RAYON_NUM_THREADS=16 ./hyper_threading_main' -n "hyper_threading_pr threads: 16" 'RAYON_NUM_THREADS=16 ./hyper_threading_pr'
Benchmark 1: hyper_threading_main threads: 16
  Time (mean ± σ):      9.573 s ±  0.252 s    [User: 35.817 s, System: 1.143 s]
  Range (min … max):    9.395 s …  9.752 s    2 runs
 
Benchmark 2: hyper_threading_pr threads: 16
  Time (mean ± σ):      9.589 s ±  0.075 s    [User: 35.819 s, System: 1.120 s]
  Range (min … max):    9.536 s …  9.642 s    2 runs
 
Summary
  hyper_threading_main threads: 16 ran
    1.00 ± 0.03 times faster than hyper_threading_pr threads: 16

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github-actions bot commented Jan 23, 2026 •
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Benchmark Results for unmodified programs 🚀

Command Mean [s] Min [s] Max [s] Relative
base big_factorial 1.986 ± 0.070 1.955 2.181 1.01 ± 0.04
head big_factorial 1.968 ± 0.006 1.954 1.975 1.00
Command Mean [s] Min [s] Max [s] Relative
base big_fibonacci 1.925 ± 0.013 1.910 1.950 1.00
head big_fibonacci 1.927 ± 0.005 1.917 1.934 1.00 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base blake2s_integration_benchmark 6.939 ± 0.119 6.843 7.141 1.00
head blake2s_integration_benchmark 6.940 ± 0.042 6.873 7.037 1.00 ± 0.02
Command Mean [s] Min [s] Max [s] Relative
base compare_arrays_200000 2.049 ± 0.006 2.042 2.061 1.00
head compare_arrays_200000 2.057 ± 0.014 2.038 2.079 1.00 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base dict_integration_benchmark 1.347 ± 0.007 1.338 1.363 1.00
head dict_integration_benchmark 1.376 ± 0.007 1.367 1.393 1.02 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base field_arithmetic_get_square_benchmark 1.152 ± 0.005 1.147 1.165 1.00
head field_arithmetic_get_square_benchmark 1.163 ± 0.004 1.154 1.167 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base integration_builtins 7.020 ± 0.033 6.978 7.090 1.00
head integration_builtins 7.075 ± 0.053 7.020 7.209 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base keccak_integration_benchmark 7.044 ± 0.016 7.017 7.075 1.00
head keccak_integration_benchmark 7.143 ± 0.069 7.090 7.333 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base linear_search 2.039 ± 0.023 2.025 2.098 1.00
head linear_search 2.054 ± 0.021 2.036 2.113 1.01 ± 0.02
Command Mean [s] Min [s] Max [s] Relative
base math_cmp_and_pow_integration_benchmark 1.426 ± 0.006 1.419 1.434 1.00
head math_cmp_and_pow_integration_benchmark 1.451 ± 0.006 1.445 1.463 1.02 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base math_integration_benchmark 1.384 ± 0.012 1.369 1.416 1.00
head math_integration_benchmark 1.410 ± 0.006 1.402 1.421 1.02 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base memory_integration_benchmark 1.142 ± 0.010 1.135 1.164 1.00
head memory_integration_benchmark 1.156 ± 0.011 1.146 1.184 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base operations_with_data_structures_benchmarks 1.475 ± 0.005 1.469 1.489 1.00
head operations_with_data_structures_benchmarks 1.502 ± 0.009 1.490 1.521 1.02 ± 0.01
Command Mean [ms] Min [ms] Max [ms] Relative
base pedersen 513.0 ± 1.7 511.2 515.9 1.00
head pedersen 514.8 ± 2.1 512.1 519.1 1.00 ± 0.01
Command Mean [ms] Min [ms] Max [ms] Relative
base poseidon_integration_benchmark 587.0 ± 1.6 584.4 589.8 1.00
head poseidon_integration_benchmark 594.3 ± 4.0 589.6 601.9 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base secp_integration_benchmark 1.749 ± 0.049 1.726 1.888 1.00 ± 0.03
head secp_integration_benchmark 1.745 ± 0.005 1.737 1.752 1.00
Command Mean [ms] Min [ms] Max [ms] Relative
base set_integration_benchmark 651.3 ± 2.2 649.2 655.0 1.00
head set_integration_benchmark 657.5 ± 5.1 652.5 667.0 1.01 ± 0.01
Command Mean [s] Min [s] Max [s] Relative
base uint256_integration_benchmark 3.947 ± 0.010 3.934 3.966 1.00
head uint256_integration_benchmark 4.021 ± 0.028 3.971 4.075 1.02 ± 0.01

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codecov bot commented Jan 23, 2026 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.99%. Comparing base (9f72561) to head (d7952be).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files 
@@           Coverage Diff           @@
##             main    #2309   +/-   ##
=======================================
  Coverage   95.99%   95.99%           
=======================================
  Files         104      104           
  Lines       36914    36916    +2     
=======================================
+ Hits        35437    35439    +2     
  Misses       1477     1477

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