Crates / Compare / slab vs tikv-jemallocator
Rust crates side by side · data Oct 24, 2026
slab vs tikv-jemallocator
Short answerBy steady daily use, slab is bigger: 3,013,568 real downloads a day against 295,126 for tikv-jemallocator (10.2x). 619 crates depend on slab and 435 on tikv-jemallocator. slab last shipped 9 months ago, tikv-jemallocator 5 months ago.
slab
EstablishedEstablished and steady.
619 crates depend on it; no release in the last 90 days, so its count is all steady use.
Pre-allocated storage for a uniform data type
tikv-jemallocator
EstablishedEstablished and losing ground.
435 crates depend on it; no release in the last 90 days, so its count is all steady use.
A Rust allocator backed by jemalloc
slabtikv-jemallocator · 100% = that crate's normal quiet day, so a spike to 300% is triple its usual traffic
Every number, side by side
| Same window, same method | slab | tikv-jemallocator |
|---|---|---|
| Real downloads a day | 3,013,568 | 295,126 |
| Crates that depend on it | 619 | 435 |
| Last release | 0.4.12, 9 months ago | 0.7.0, 5 months ago |
| Trend vs the field | -3% | -11% |
| Release-window share | 0.0% | 0.0% |
| Downloads in the window | 263,918,978 | 24,563,320 |
| All-time downloads | 1,049,565,588 | 107,337,837 |
| Versions published | 19 | 8 |
| License | MIT | MIT/Apache-2.0 |
| MSRV | 1.51 | not set |
| First published | Jun 15, 2015 | Jul 21, 2020 |
Which to pick
- Downloads tell you what is common, not what fits. Each crate's own description above says what it is for; when the jobs differ, pick by the job.
- When both fit, prefer the one more crates depend on (slab, 619 dependents): more eyes, more answered questions, and you may already have it in your tree.
- Check the release dates against your own pace: slab 9 months ago, tikv-jemallocator 5 months ago.
Also in this space
Method
Real downloads = the median day with no release that day or the day before, from the crates.io API (Jul 27, 2026 to Oct 23, 2026). Raw crates.io counts include CI and bots and run high (why); the method is from our 90-day study.
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