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v0.12.0 — 4 GiB Active VRAM Tiering, Host Safety Clamping, and Cascade Stress Qualification

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@emersonbusson emersonbusson released this 13 Sep 02:57
· 124 commits to main since this release
v0.12.0
f1805c3

RamShared v0.12.0 — Production Release

🚀 Highlights & Architectural Milestones

1. 4 GiB Active VRAM Tiering & Dynamic Host Safety Floor

  • Active 4,096 MB GPU VRAM Allocation: Expanded the high-speed PCIe memory tier to 4,096 MB on dedicated hardware (NVIDIA GeForce RTX 2060).
  • Dynamic Display Headroom Floor: Hardened host safety clamping with dynamic memory floors (max(1536 MB, 20%)), completely eliminating host Windows desktop stutter and DWM stalls.
  • CUDA-Rust Resilience: Replaced unverified fallback heuristics with atomic error classification and seamless failover to host RAM buffers upon GPU context eviction.

2. Closed-Loop Multi-Tier Swap Pacing Governor

  • Paces memory allocation against active kernel kswapd drain rates.
  • Prevents memory starvation and latency spikes under heavy multi-tasking workloads.

3. Real-Time Hardware Throughput & Tail Jitter Telemetry

  • Empirical /proc/diskstats Telemetry: Sustained 612.2 MB/s to 625.4 MB/s across PCIe DMA channels (31.2x acceleration factor over NVMe/SSD fallback).
  • High-Resolution Cycle Tracking: Sub-microsecond page-fault tracking and p99 tail jitter telemetry integrated into ramshared top.

4. Linux Kernel 6.18 LTS Driver Upstreaming

  • Upstream driver architecture prepared for Linux 6.18 LTS and modern kernel subsystems (ublk / io_uring).
  • Clean C block driver implementation adhering strictly to Linux kernel guard clauses and semantic errno handling.

📊 Hardware Benchmark Comparison

Category / Metric Tier 0: ZRAM Tier 1: GPU VRAM Tier 3: SSD Origin Status / Verdict
Access Latency 0.08 µs 1.72 µs 48.2 µs 🟢 GAIN (31.2x boost vs SSD)
Sustained Throughput Direct CPU RAM 6.07 GiB/s PCIe 6.63 GB/s raw 🟢 GAIN
Empirical Throughput 128.2 MB/s 625.4 MB/s 1,077.2 MB/s 🟢 GAIN
Memory Saturation 1,024 MB (100%) 4,096 MB (100%) 2,367 MB active 🟢 GAIN (171% of RAM)
Reclaim Bus Bandwidth Direct RAM 21.66 GB/s DMA Direct Disk 🟢 GAIN (910 ms total reclaim)
PSI Memory Stall Time 0.00% avg10 0.00% avg10 0.00% avg10 🟢 ZERO STALLS
Bit-Exact Integrity 100% Match 100% Match 100% Match 🟢 SHA-256 Byte-Exact
Host Stability Verdict PASS PASS PASS PASS_ZERO_PANIC

📦 Distribution Packages & Verification

Binary packages built for multiple Linux distributions will be attached automatically by the packaging workflow:

  • Debian / Ubuntu: ramshared_0.12.0_amd64.deb
  • Fedora / RHEL / CentOS: ramshared-0.12.0-1.x86_64.rpm
  • Arch Linux (AUR package): ramshared-arch.tar.gz
  • Integrity Manifest: SHA256SUMS.txt
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