# MinIO MemKV RELEASE.2026-05-18T09-04-29Z Released: 2026-05-18 Stability and resource-footprint follow-up to the inaugural release. Cached blocks now survive NIXL agent shutdown, client and server memory leaks are fixed, TTFT improves on the Dynamo / KVBM path, and the server uses jemalloc as the global allocator. New read/write byte counters in Prometheus, exporter is now default-on, and the docs.min.io/memkv site has been restructured with an INTEGRATIONS catalog. --- ## Downloads ### Server Binary | Platform | Architecture | Download | | -------- | ------------ | -------- | | Linux | amd64 | [memkv](https://dl.min.io/aistor/memkv/release/linux-amd64/memkv) | | Linux | arm64 | [memkv](https://dl.min.io/aistor/memkv/release/linux-arm64/memkv) | ### NIXL Plugin (for Dynamo / KVBM integrations) | Platform | Architecture | Download | | -------- | ------------ | -------- | | Linux | amd64 | [libplugin_MEMKV.so](https://dl.min.io/aistor/memkv/release/linux-amd64/libplugin_MEMKV.so) | | Linux | arm64 | [libplugin_MEMKV.so](https://dl.min.io/aistor/memkv/release/linux-arm64/libplugin_MEMKV.so) | ### LD_PRELOAD Shim (for MLPerf-Storage kvcache workloads) | Platform | Architecture | Download | | -------- | ------------ | -------- | | Linux | amd64 | [libmemkv_preload.so](https://dl.min.io/aistor/memkv/release/linux-amd64/libmemkv_preload.so) | | Linux | arm64 | [libmemkv_preload.so](https://dl.min.io/aistor/memkv/release/linux-arm64/libmemkv_preload.so) | ### Packages `.deb`, `.rpm`, and `.apk` packages bundle the server + both `.so` sidecars + the LMCache and sglang Python wheels into a single per-arch install. | Format | Architecture | Download | | ------ | ------------ | -------- | | DEB | amd64 | [memkv\_20260518090429.0.0_amd64.deb](https://dl.min.io/aistor/memkv/release/linux-amd64/memkv_20260518090429.0.0_amd64.deb) | | DEB | arm64 | [memkv\_20260518090429.0.0_arm64.deb](https://dl.min.io/aistor/memkv/release/linux-arm64/memkv_20260518090429.0.0_arm64.deb) | | RPM | amd64 | [memkv-20260518090429.0.0-1.x86_64.rpm](https://dl.min.io/aistor/memkv/release/linux-amd64/memkv-20260518090429.0.0-1.x86_64.rpm) | | RPM | arm64 | [memkv-20260518090429.0.0-1.aarch64.rpm](https://dl.min.io/aistor/memkv/release/linux-arm64/memkv-20260518090429.0.0-1.aarch64.rpm) | | APK | amd64 | [memkv\_20260518090429.0.0_x86_64.apk](https://dl.min.io/aistor/memkv/release/linux-amd64/memkv_20260518090429.0.0_x86_64.apk) | | APK | arm64 | [memkv\_20260518090429.0.0_aarch64.apk](https://dl.min.io/aistor/memkv/release/linux-arm64/memkv_20260518090429.0.0_aarch64.apk) | After installing the deb/rpm, the Python plugin wheels land at `/usr/share/memkv/wheels/`: ```bash pip install /usr/share/memkv/wheels/memkv_lmcache-*.whl pip install /usr/share/memkv/wheels/memkv_sglang-*.whl ``` The NIXL plugin is auto-symlinked to `/opt/nvidia/nvda_nixl/lib/plugins/` when that directory exists (postinstall hook). ### Container Image ```bash docker pull quay.io/minio/memkv:RELEASE.2026-05-18T09-04-29Z docker pull quay.io/minio/memkv:latest ``` Container ships the server + the NIXL plugin (under `/usr/local/lib/plugins/`). The LD_PRELOAD shim and Python wheels are not included in the container image — use the deb/rpm for those. ### Verification Each binary is signed with both minisign (preferred) and GPG; sha256sums are published alongside. ```bash # minisign minisign -Vm memkv -P RWTx5Zr1tiHQLwG9keckT0c45M3AGeHD6IvimQHpyRywVWGbP1aVSGav # sha256 sha256sum -c memkv.sha256sum ``` (The minisign public key above is the MinIO release-signing key — same key used across the AIStor product line.) --- ## Changes since RELEASE.2026-05-12T19-07-44Z ### Bug Fixes - **Cached blocks survive NIXL agent shutdown.** `memkv_unload_md` no longer issues a DELETE RPC for every block on teardown; the cache now persists across vLLM restarts as intended. - **NIXL plugin teardown no longer segfaults the vLLM container.** `~nixlRemoteSection()` previously fanned thousands of synchronous control sends through the connection pool. - **Client connection pool is bounded by `num_connections`.** The per-thread index now folds modulo `num_connections` instead of growing unbounded across calling threads. - **Server reaps dead RC connections on flush completions.** Prevents per-connection QPs and pinned control buffers from accumulating after client crashes, vLLM bounces, or network blips. - **NIXL plugin survives `dlclose` during backend teardown.** The `.so` is pinned with `RTLD_NOLOAD | RTLD_NODELETE` and in-flight transfers drain before the engine is destroyed. - **`RdmaConnection::drop` diagnostics no longer abort vLLM workers.** Diagnostics use `eprintln!` instead of tracing macros that hit `AccessError` during thread-local teardown. ### Performance - **Engine RDMA rails are shared across threads.** Eliminates DCI-pool exhaustion under TP=8 NIXL workloads and removes the silent RC fallback that drove server-side completion-poll timeouts. - **Server uses jemalloc as the global allocator.** Materially reduces the non-pool resident footprint on multi-thread direct-mode deployments compared to glibc malloc. ### New Features - **`memkv_read_bytes_total` and `memkv_write_bytes_total` Prometheus counters.** Bytes/s is now directly observable without knowing the client's KVBM block size. - **Prometheus exporter is default-on.** `MEMKV_PROMETHEUS_BIND` works on a stock build; no `--features prometheus` rebuild required. - **jemalloc heap profiling is available in release builds.** Set `MALLOC_CONF=prof:true,...` at startup and use `jeprof` against the binary. - **`memkv-bench --engine-read` and `--reregister-every`.** Reproduces the NIXL plugin's read-path shape without standing up vLLM, KVBM, or Dynamo. ### Behavior Changes - **`num_connections` is now a hard upper bound.** Previously it was a starting hint that grew with the number of unique calling threads. ### Security Updates - **Docs site bumped to Next.js 15.5.18** — picks up GHSA-8h8q-6873-q5fj and other advisories. Server data plane is unaffected. ### Documentation - **docs.min.io/memkv restructured** into four sidebar sections — get-started, integrate, operate, internals — with sitemap, OG unfurls, and a custom 404. - **Drift check between code and docs** asserts every `clap` flag and `MEMKV_*` env var is documented. - **`INTEGRATIONS.md` catalog** covering the plugin, sglang, lmcache, preload, and kv-store integrations plus the Dynamo / KVBM patch series. - **Licensing pointer** to from the Free-tier and quick-start pages. --- ## Documentation - Hosted docs: - Embedded docs (in the binary): `memkv doc` serves the same site locally. ## Support - Licensed customers: - Security disclosures: