Datasets:
section stringclasses 3
values | impl stringclasses 10
values | language stringclasses 5
values | package stringclasses 10
values | version stringclasses 10
values | call stringclasses 10
values | reach stringclasses 10
values | counter_bits float64 0 42 ⌀ | fresh_random_bits float64 32 74 ⌀ | ids_per_sec float64 521k 24.1M ⌀ | out_of_order float64 0 500k ⌀ | out_of_order_pct float64 0 50 ⌀ | duplicates float64 0 0 ⌀ | max_ids_in_one_ms float64 1 24.7k ⌀ | ts_ahead_of_clock_ms_after_1M stringclasses 6
values | max_ts_ahead_ms float64 0 999k ⌀ | mean_bits_changed_same_ms float64 18 37 ⌀ | clock_jump_behavior stringclasses 9
values | load_ids_per_ms float64 1 10 ⌀ | sim_ms float64 0 121k ⌀ | lag_ms float64 0 4.69M ⌀ | out_of_order_total float64 0 545k ⌀ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
tight_loop_1M | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | 226,213,391 downloads in 90 days (crates.io) | 42 | 32 | 14,050,252 | 0 | 0 | 0 | 14,421 | 0 | 0 | 18 | freeze: reuses last timestamp, bumps counter | null | null | null | null |
tight_loop_1M | rs-uuid7 | Rust | uuid7 (crate, LiosK) | 1.8.0 | uuid7::uuid7() | 46,634 downloads in 90 days (crates.io) | 42 | 32 | 24,137,739 | 0 | 0 | 0 | 24,687 | 0 | 0 | 18 | reset: after a rollback over 10 s, follows the clock again | null | null | null | null |
tight_loop_1M | py-stdlib | Python | uuid (standard library) | CPython 3.15.1 | uuid.uuid7() | ships with Python 3.14+ | 42 | 32 | 1,060,892 | 0 | 0 | 0 | 1,238 | -1 | 0 | 18 | runaway: +1 ms per ID while the clock is behind | null | null | null | null |
tight_loop_1M | py-uuid6 | Python | uuid6 (PyPI) | 2025.0.1 | uuid6.uuid7() | 10,858,926 downloads last month (pypistats) | 0 | 74 | 762,438 | 0 | 0 | 0 | 1 | 998688 | 998,688 | null | runaway: +1 ms per ID whenever two IDs share a millisecond | null | null | null | null |
tight_loop_1M | py-uuid7pkg | Python | uuid7 (PyPI) | 0.1.0 | uuid_extensions.uuid7() | 11,048,710 downloads last month (pypistats) | 14 | 48 | 757,529 | 0 | 0 | 0 | null | n/a (decodes to 2202) | null | 27.96 | draft layout: no unix-ms field; follows the clock backwards | null | null | null | null |
tight_loop_1M | py-uuid-utils | Python | uuid-utils (PyPI, Rust core) | 1.1.0 | uuid_utils.uuid7() | 69,759,392 downloads last month (pypistats) | 42 | 32 | 8,532,001 | 0 | 0 | 0 | 9,106 | 1 | 10 | 18 | not simulated; it calls the Rust uuid crate now_v7 (freeze) | null | null | null | null |
tight_loop_1M | node-uuid | JavaScript | uuid (npm) | 14.0.3 | v7() | 173,698,867 downloads last week (npm) | 32 | 42 | 520,984 | 0 | 0 | 0 | 855 | 0 | 0 | 22.99 | freeze: reuses last timestamp, bumps 32-bit seq | null | null | null | null |
tight_loop_1M | node-uuidv7 | JavaScript | uuidv7 (npm, LiosK) | 1.2.1 | uuidv7() | 1,989,232 downloads last week (npm) | 42 | 32 | 560,156 | 0 | 0 | 0 | 3,016 | 0 | 0 | 18.01 | reset: after a rollback over 10 s, follows the clock again | null | null | null | null |
tight_loop_1M | go-google-uuid | Go | github.com/google/uuid | 1.6.0 | uuid.NewV7() | imported by 113,457 packages (pkg.go.dev) | 12 | 62 | 9,049,306 | 0 | 0 | 0 | 4,096 | 135 | 135 | 32.99 | freeze: +1/4096 ms per ID while behind | null | null | null | null |
tight_loop_1M | net-guid | C# / .NET | System.Guid | .NET 10.0.13 | Guid.CreateVersion7() | built into .NET 9+ | 0 | 74 | 13,006,438 | 500,470 | 50.047 | 0 | 18,126 | 0 | 0 | 37 | stateless: timestamp follows the clock, order is random within a ms | null | null | null | null |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 0 | 0 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 500 | 0 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 1,000 | 3,599,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 2,500 | 3,598,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 5,000 | 3,595,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 7,500 | 3,593,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 10,000 | 3,590,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 12,500 | 3,588,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 15,000 | 3,585,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 17,500 | 3,583,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 20,000 | 3,580,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 22,500 | 3,578,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 25,000 | 3,575,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 27,500 | 3,573,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 30,000 | 3,570,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 32,500 | 3,568,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 35,000 | 3,565,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 37,500 | 3,563,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 40,000 | 3,560,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 42,500 | 3,558,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 45,000 | 3,555,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 47,500 | 3,553,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 50,000 | 3,550,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 52,500 | 3,548,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 55,000 | 3,545,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 57,500 | 3,543,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 60,000 | 3,540,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 62,500 | 3,538,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 65,000 | 3,535,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 67,500 | 3,533,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 70,000 | 3,530,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 72,500 | 3,528,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 75,000 | 3,525,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 77,500 | 3,523,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 80,000 | 3,520,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 82,500 | 3,518,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 85,000 | 3,515,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 87,500 | 3,513,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 90,000 | 3,510,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 92,500 | 3,508,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 95,000 | 3,505,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 97,500 | 3,503,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 100,000 | 3,500,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 102,500 | 3,498,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 105,000 | 3,495,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 107,500 | 3,493,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 110,000 | 3,490,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 112,500 | 3,488,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 115,000 | 3,485,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 117,500 | 3,483,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 120,000 | 3,480,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 1 | 120,999 | 3,480,000 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 0 | 0 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 500 | 0 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 1,000 | 3,599,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 2,500 | 3,598,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 5,000 | 3,595,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 7,500 | 3,593,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 10,000 | 3,590,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 12,500 | 3,588,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 15,000 | 3,585,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 17,500 | 3,583,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 20,000 | 3,580,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 22,500 | 3,578,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 25,000 | 3,575,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 27,500 | 3,573,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 30,000 | 3,570,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 32,500 | 3,568,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 35,000 | 3,565,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 37,500 | 3,563,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 40,000 | 3,560,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 42,500 | 3,558,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 45,000 | 3,555,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 47,500 | 3,553,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 50,000 | 3,550,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 52,500 | 3,548,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 55,000 | 3,545,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 57,500 | 3,543,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 60,000 | 3,540,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 62,500 | 3,538,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 65,000 | 3,535,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 67,500 | 3,533,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 70,000 | 3,530,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 72,500 | 3,528,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 75,000 | 3,525,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 77,500 | 3,523,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 80,000 | 3,520,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 82,500 | 3,518,499 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 85,000 | 3,515,999 | 0 |
clock_jump_back_1h | rs-uuid | Rust | uuid (crate) | 1.29.0 | Uuid::now_v7() | null | null | null | null | null | null | null | null | null | null | null | null | 2 | 87,500 | 3,513,499 | 0 |
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Moved: this dataset now lives at huggingface.co/datasets/tensorust/uuidv7-library-test and is updated there.
UUIDv7 library test: order and timestamps in 10 libraries
Raw results from our test of 10 popular UUIDv7 libraries across Rust, Python, JavaScript, Go and .NET: does each one keep IDs in order, and does the embedded timestamp stay true, both in a tight loop and after the clock steps back an hour. Tested 2026-10-23. 1,489 rows: the tight-loop result for all 10 libraries, 27 clock-jump runs and 3 healthy-clock uuid6 runs, sampled every 2.5 simulated seconds.
Libraries: Rust uuid 1.29.0 and uuid7 1.8.0; Python standard library uuid.uuid7() (CPython 3.15.1), uuid6 2025.0.1, uuid7 0.1.0, uuid-utils 1.1.0; JavaScript uuid 14.0.3 and uuidv7 1.2.1; Go google/uuid 1.6.0; .NET Guid.CreateVersion7() (.NET 10.0.13).
How it was collected
- Machine: Intel i7-13700KF, 32 GB, Windows 11, one thread.
tight_loop_1M: one thread makes 1,000,000 IDs as fast as the library allows, reading the wall clock every 10,000 IDs. We count IDs that sort at or below the one made just before them (byte order, as a database index sees them), duplicates, and how far the embedded timestamp drifts from the real clock.clock_jump_back_1h: a fake clock is injected into each real library (Pythontime.time_ns, JavaScriptDate.now, Go's internaltimeNowhook via one added line in a vendored copy, the explicit-timestamp APIs in Rust and .NET). It runs normally for 1 second, steps back 3,600,000 ms, then runs 120 more simulated seconds, at 1, 2 and 10 IDs per millisecond.lag_ms= embedded timestamp minus the clock.healthy_clock_60s: the same simulation for uuid6 with no clock jump.- Note: the CSV on tensorust.com starts with two
#comment lines holding the notes above; this copy drops them so the file loads as a plain table. The rows are unchanged.
Columns
section (test name), impl, language, package, version, call, reach (downloads or importers when tested), counter_bits, fresh_random_bits, ids_per_sec, out_of_order, out_of_order_pct, duplicates, max_ids_in_one_ms, ts_ahead_of_clock_ms_after_1M, max_ts_ahead_ms, mean_bits_changed_same_ms, clock_jump_behavior (tight-loop rows); load_ids_per_ms, sim_ms, lag_ms, out_of_order_total (clock rows). Columns that do not apply to a section are blank.
Source and updates
Full write-up, findings and caveats: https://tensorust.com/articles/uuidv7-libraries-tested/ . Original CSV: https://tensorust.com/articles/uuidv7-libraries-tested/data.csv . All our methods: https://tensorust.com/methods/ .
Limits
One machine, one thread. Multi-process generators were not tested. The clock jump is simulated inside the real library code, not by changing the system clock. RFC 9562 permits all of these behaviors; "fails" in the article means "does not give you what UUIDv7 posts promise", not "violates the spec".
How to cite
Tensorust Research (2026). UUIDv7 library test: 10 libraries tested for order and true timestamps. https://tensorust.com/articles/uuidv7-libraries-tested/
@misc{tensorust2026uuidv7,
author = {{Tensorust Research}},
title = {UUIDv7 library test: 10 libraries tested for order and true timestamps},
year = {2026},
howpublished = {\url{https://tensorust.com/articles/uuidv7-libraries-tested/}},
note = {CC BY 4.0}
}
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