Initial upload: 60 DAMOV traces + 1 llama2c stories15M LLM-inference trace

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README.md

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+# tiered-mem-traces
+
+**60 memory access traces** for tiered-memory simulation, covering all 16
+benchmark suites of the [CMU-SAFARI/DAMOV](https://github.com/CMU-SAFARI/DAMOV)
+suite, plus **1 LLM-inference trace** collected from llama2.c (under
+`llama_inference/`, Git LFS — see § LLM-inference trace).
+Each trace preserves load/store/modify classification from
+[Valgrind's lackey tool](https://valgrind.org/docs/manual/lk-manual.html).
+
+## Format
+
+Each trace is a gzipped text file with one memory operation per line:
+
+```
+S 1fff000198,8
+S 1fff000190,8
+S 1fff000188,8
+L 04038e06,1
+M 04038e10,4
+```
+
+- `L` = load, `S` = store, `M` = modify (read-modify-write)
+- `<hex_addr>,<size>` = byte address and access size
+- Instruction fetches are excluded; only data accesses are recorded
+
+Total: 97 MB compressed (~4 GB uncompressed).
+
+## Traces (60 total, by suite)
+
+| Trace | Description | Access Pattern | Size |
+|-------|-------------|----------------|-----:|
+| **bwa** (genomics) | | | |
+| `bwa.AlignLite` | BWA-MEM short-read alignment via FM-index lookup | scattered reads into a hot index region | 817K |
+| **chai** (heterogeneous) | | | |
+| `chai.BFS` | frontier-driven graph BFS over a CSR graph | scattered adjacency reads, drifting hot frontier | 1.1M |
+| `chai.BS.BEZIER_KERNEL` | 2D Bezier surface evaluation | structured streaming with small reused control set | 1.1M |
+| `chai.CEDD.Gaussian` | 5x5 Gaussian-blur image convolution | stencil streaming, near-perfect spatial locality | 1.3M |
+| `chai.CEDD.Sobel` | 3x3 Sobel edge-detection | stencil streaming | 1.3M |
+| `chai.HSTI` | input-side histogram increment | stream-read + scattered hot-write into bins | 782K |
+| `chai.OOPPAD.OOPPAD` | out-of-place 2D padding (border insertion) | streaming with reflected-border copy | 1.3M |
+| `chai.SC.SC` | stream compaction = filter + prefix-sum + scatter | two streaming passes + scattered scatter | 753K |
+| **darknet** (ML) | | | |
+| `darknet.conv` | im2col-style 2D convolution layer | weight streaming + activation reuse | 1.1M |
+| **gase** (genomics) | | | |
+| `gase.Align` | banded Smith-Waterman DP cell update | streaming along the band, three-row reuse | 4.1M |
+| **hardware_effects** (microbench) | | | |
+| `hardware_effects.bandwidth` | page-stride memory walk | scattered, anti-prefetcher pattern | 2.5M |
+| `hardware_effects.false_sharing` | single-threaded RMW alternating two cache-line slots | high temporal locality, RMW writes | 259K |
+| **hashjoin** (database) | | | |
+| `hashjoin.MPSM` | massively-parallel sort-merge join | two-stream merge with run-length copies | 2.8M |
+| `hashjoin.NPO.HashJoin` | no-partition open-addressed hash join (build + probe) | sequential probe + hot hash-table writes | 1.1M |
+| `hashjoin.NPO_st` | single-thread no-partition variant of NPO | sequential probe + scattered hash-table reads | 2.8M |
+| `hashjoin.PRO` | partitioned radix-style hash join | phase change between partition-build and probe | 1.5M |
+| **hpcc** (HPC) | | | |
+| `hpcc.RandomAccess` | GUPS-style xor-shift updates to random table slots | uniform-random scattered RMW | 2.5M |
+| **hpcg** (HPC) | | | |
+| `hpcg.CG` | conjugate-gradient inner loop on a 7-pt sparse stencil | SpMV scattered reads + vector streaming reductions | 2.2M |
+| `hpcg.MG` | 3-level multigrid V-cycle (smooth + restrict + prolong) | stencil sweep at multiple resolutions | 408K |
+| `hpcg.SpMV` | sparse matrix-vector multiply on a 27-pt stencil | row-streaming + scattered neighbor reads | 1.2M |
+| **ligra** (graph) | | | |
+| `ligra.BC` | betweenness centrality via Brandes-style two-pass BFS | frontier sweep + dependency back-propagation | 2.7M |
+| `ligra.BellmanFord` | single-source shortest paths via repeated edge relaxation | edge-stream sweep with dist updates per round | 3.1M |
+| `ligra.BFS` | frontier-driven BFS | per-level frontier sweep, drifting hot set | 1.9M |
+| `ligra.Components` | connected-components via min-label propagation | full edge-stream sweep per round, label updates | 2.4M |
+| `ligra.KCore` | k-core decomposition by iterative low-degree peeling | vertex-array sweep with neighbor degree updates | 2.0M |
+| `ligra.MIS` | maximal independent set via Luby-style randomized priority | neighbor-priority compare + alive removal | 1.9M |
+| `ligra.PageRank` | PageRank: full-vertex sweep with adjacency-list reads | per-iter full-vertex stream + scattered neighbor writes | 2.0M |
+| `ligra.Triangle` | triangle counting via per-edge neighbor-set intersection | nested adjacency-list scans, heavy reads | 520K |
+| **parboil** (HPC) | | | |
+| `parboil.histo` | image histogram with ~16k bins | streaming read + scattered bin RMW | 884K |
+| `parboil.mri-q` | MRI Q-matrix construction (per-voxel trig accumulation) | double-loop over voxels x k-points, streaming | 1.5M |
+| `parboil.sgemm` | naive single-precision dense matmul | triple-loop with strided B access | 1.1M |
+| `parboil.spmv` | sparse matrix-vector multiply (random sparsity) | row-stream + irregular column reads | 815K |
+| **parsec** (multimedia) | | | |
+| `parsec.Streamcluster` | k-means-style center-distance scan | stream over points + sequential per-DIM | 1.1M |
+| **phoenix** (mapreduce) | | | |
+| `phoenix.histogram` | 256-bin histogram over a streaming byte input | streaming read + dense hot-write into 256 bins | 863K |
+| `phoenix.kmeans` | k-means iterations: assign + center update | phase change between assign and reduce | 963K |
+| `phoenix.lr` | linear-regression gradient descent | streaming over (x, y) pairs | 956K |
+| `phoenix.matrix-mult` | MapReduce-flavored dense matmul | row-by-row mapper-style sweep | 1.4M |
+| `phoenix.reverseindex` | build a doc->terms reverse index | scattered hash-style writes + linked-list traversals | 744K |
+| `phoenix.WordCount` | MapReduce word count via open-addressed hash table | streaming over words + scattered hash probes | 823K |
+| **polybench** (HPC) | | | |
+| `polybench.3mm` | three sequential dense matmuls (E=AB; F=CD; G=EF) | tiled streaming with phase change between matmuls | 1.6M |
+| `polybench.atax` | y = A^T * (A x) (transpose + matrix-vector twice) | two streaming sweeps over A with vector reads | 897K |
+| `polybench.bicg` | biconjugate-gradient kernel: q=Ap; s=A^T r | single sweep over A with two simultaneous reductions | 854K |
+| `polybench.doitgen` | 3D tensor reduction | structured streaming with reduction | 1.2M |
+| `polybench.gemm` | naive dense matmul C = A * B + C | triple-loop with strided B access | 1.4M |
+| `polybench.syr2k` | symmetric rank-2 update C = AB^T + BA^T + C | triple-loop with shared inner-K accumulation | 1.6M |
+| **rodinia** (heterogeneous) | | | |
+| `rodinia.bfs` | BFS on a regular 4-connected 2D grid | regular per-level frontier sweep | 1.7M |
+| `rodinia.cfd` | Euler-equation flux update on an unstructured mesh | edge-stream with scatter to two endpoints | 3.9M |
+| `rodinia.hotspot` | 2D thermal-stencil sweep with two-array swap | 5-pt stencil, two-array swap per iter | 1.4M |
+| `rodinia.lavamd` | short-range MD pairwise force calc with cutoff | O(N^2) pairwise with cutoff rejection | 1.4M |
+| `rodinia.lud` | right-looking LU decomposition without pivoting | triangular sweep with shrinking trailing block | 1.6M |
+| `rodinia.srad` | speckle-reducing anisotropic-diffusion image filter | two-pass per-pixel stencil | 1.8M |
+| **splash2** (HPC) | | | |
+| `splash2.FFT` | 1D FFT (bit-reversal + butterfly stages) | bit-reversal scatter + log(N) butterfly passes | 2.2M |
+| `splash2.FMM` | O(N^2) particle pairwise interactions | O(N^2) double-loop with sqrt per pair | 966K |
+| `splash2.OCEAN` | 2D 5-pt stencil sweep with two interleaved grids | stencil streaming with three-grid update | 1.9M |
+| `splash2.RADIOSITY` | hierarchical 2D iterative form-factor refinement | KxK gather kernel applied per cell | 1.3M |
+| `splash2.RAYTRACE` | ray casting through a small scene of spheres | per-pixel scene scan, frequent shared-data reads | 895K |
+| **stream** (microbench) | | | |
+| `stream.Add` | c[i] = a[i] + b[i] | perfectly sequential streaming, no reuse | 3.5M |
+| `stream.Copy` | c[i] = a[i] | perfectly sequential streaming, no reuse | 3.5M |
+| `stream.Scale` | b[i] = scalar * c[i] | perfectly sequential streaming, no reuse | 3.5M |
+| `stream.Triad` | a[i] = b[i] + scalar * c[i] | perfectly sequential streaming, no reuse | 3.5M |
+
+## LLM-inference trace
+
+One extra trace lives under `llama_inference/` and is stored via **Git LFS**
+(the file is ~323 MB compressed). It is **not** part of the 60-trace DAMOV
+set above — different workload class, different scale.
+
+| Trace | Description | Access pattern | Size |
+|-------|-------------|----------------|-----:|
+| `llama_inference/llama2c_stories15M_n3` | [karpathy/llama2.c](https://github.com/karpathy/llama2.c) inference, TinyStories-15M architecture (dim=288, hidden=768, 6 layers, vocab=32000), `n=3` forward passes (BOS prefill + 2 generated tokens, seed=42), random `N(0, 0.02)` weights — memory pattern is determined by tensor shapes and access order, not weight values, so it is structurally identical to a real TinyStories-15M checkpoint | continuous hot scratchpad (RunState) + linear weight-tensor sweeps + KV-cache growth per generated token | 323M |
+
+Collection scale: 144,868,169 data accesses, 15,709 unique 4 KiB pages
+(61.4 MiB footprint), captured under
+`valgrind --tool=lackey --trace-mem=yes` with instruction fetches filtered
+out. Loads 85.8 %, stores 13.7 %, modifies 0.4 %.
+
+### Access pattern (annotated)
+
+![llama2c stories15M, n=3 annotated VA](docs/llama_inference/llama2c_stories15M_n3_annotated.png)
+
+The y-axis is the actual virtual address (stack at 131 GiB excluded — 3
+pages absorbing 13.9 % of all accesses). Region boundaries are ground
+truth from `/proc/self/maps` plus an instrumented `run.c` that printed
+every weight / RunState / KV pointer under valgrind. Three forward passes
+are visible as three structurally identical segments (dotted vertical
+guides at ~46 M / ~84 M / ~122 M accesses):
+
+- **64–66 MiB — HEAP / RunState scratchpad.** A continuous horizontal band
+  touched throughout every pass. Holds `x`, `xb`, `xb2`, `q`, `att`,
+  `logits` and other activation buffers. ~11 pages absorb ~50 % of the
+  full trace's traffic; even with stack excluded, ~63 pages cover 50 % of
+  the remaining accesses.
+- **75–110 MiB — `wcls` / `token_embedding` classifier sweep.** The large
+  diagonal climbing once per pass is the final `logits = matmul(x, wcls)`
+  projection against the 32,000-entry vocabulary (`wcls` is shared with
+  `token_embedding_table`). A 36.6 MiB linear scan at the end of every
+  forward pass.
+- **110–134 MiB — per-layer weight matmuls.** The "rainfall" pattern is
+  six layers' worth of `wq`, `wk`, `wv`, `wo`, `w1`, `w2`, `w3` sweeps.
+  Each cold weight page is touched once per forward pass.
+- **133–137 MiB — KV cache.** `key_cache` + `value_cache` (3.4 MiB total).
+  Pass 1 is pure stores; passes 2 and 3 have growing reads as the
+  attention softmax iterates over an increasing number of KV slots.
+- **131 GiB — stack (filtered in the figure).** 3 pages, 13.9 % of all
+  accesses; valgrind redirects the user stack to the top of its managed
+  address space.
+
+The combination of a tiny continuously-hot scratchpad and a large
+once-per-pass cold-weight sweep is the canonical heavy-tailed access
+pattern of LLM inference: cache-policy choice barely matters at small
+cache sizes because the hot set fits in any cache and the cold weight
+scan is unaffected by eviction order.
+
+### Reproducing
+
+The collection pipeline (random-weight `model.bin` generator, valgrind
+lackey wrapper, analyzer, plotter) lives in the arcsim repo:
+[`scripts/llama_traces/`](https://github.com/alcriceedu/arcsim/tree/main/scripts/llama_traces).
+See `scripts/llama_traces/README.md` for the full repro recipe and
+`scripts/llama_traces/REPORT_stories15M.md` for the original
+characterization run.
+
+## How Traces Were Collected
+
+Each trace comes from a small self-contained C facsimile that reproduces the
+kernel's memory access pattern at smaller-than-production scale. The pipeline:
+
+```
+DAMOV recipe -> C facsimile (gcc -O0)
+             -> valgrind --tool=lackey --trace-mem=yes
+             -> awk filter (L/S/M lines only)
+             -> gzip -6
+             -> *.bytes.trace.gz
+```
+
+These are **pre-cache** traces (Valgrind sees every load/store including stack
+traffic). Working sets are small (all 60 traces have U <= 3091 4-KiB pages).
+The qualitative access pattern shape (skew, reuse-distance distribution,
+hot-set drift, spatial locality class) is preserved from the original DAMOV
+kernels, but absolute access counts differ from production-scale runs.
+
+13 long-running workloads were SIGKILL-capped at ~25 min wall time once the
+trace had grown to 25-200M accesses.
+
+## Suite Coverage
+
+| Suite | DAMOV Functions | Traces Here |
+|-------|----------------:|------------:|
+| bwa | 2 | 1 |
+| chai | 19 | 7 |
+| darknet | 4 | 1 |
+| gase | 2 | 1 |
+| hardware_effects | 4 | 2 |
+| hashjoin | 12 | 4 |
+| hpcc | 2 | 1 |
+| hpcg | 5 | 3 |
+| ligra | 39 | 8 |
+| parboil | 7 | 4 |
+| parsec | 5 | 1 |
+| phoenix | 5 | 6 |
+| polybench | 8 | 6 |
+| rodinia | 11 | 6 |
+| splash2 | 14 | 5 |
+| stream | 4 | 4 |
+| **Total** | **143** | **60** |
+
+## Attribution
+
+These traces are derived from the **DAMOV** benchmark suite by Oliveira et al.
+(CMU-SAFARI). The kernels were re-implemented at small scale as self-contained
+C facsimiles; the intent and naming of each trace follows the original DAMOV
+classification.
+
+> Geraldo F. Oliveira, Juan Gomez-Luna, Lois Orosa, Saugata Ghose,
+> Nandita Vijaykumar, Ivan Fernandez, Mohammad Sadrosadati, Onur Mutlu.
+> "DAMOV: A New Methodology and Benchmark Suite for Evaluating Data
+> Movement Bottlenecks." IEEE Access, 2021. arXiv:2105.03725
+>
+> https://github.com/CMU-SAFARI/DAMOV
+
+DAMOV aggregates kernels from BWA, Chai, Darknet, GASE, Hardware-Effects,
+HPC-Challenge, HPCG, Hashjoin, Ligra, PARSEC, Parboil, PolyBench, Phoenix,
+Rodinia, SPLASH-2, and STREAM -- each licensed and credited by its upstream
+authors.

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