{"id":105853,"date":"2026-07-21T19:33:04","date_gmt":"2026-07-21T19:33:04","guid":{"rendered":"https:\/\/youzum.net\/validating-distributed-llm-serving-benchmarks-with-nvidia-srt-slurm-slurm-recipes-parameter-sweeps-and-pareto-analysis\/"},"modified":"2026-07-21T19:33:04","modified_gmt":"2026-07-21T19:33:04","slug":"validating-distributed-llm-serving-benchmarks-with-nvidia-srt-slurm-slurm-recipes-parameter-sweeps-and-pareto-analysis","status":"publish","type":"post","link":"https:\/\/youzum.net\/it\/validating-distributed-llm-serving-benchmarks-with-nvidia-srt-slurm-slurm-recipes-parameter-sweeps-and-pareto-analysis\/","title":{"rendered":"Validating Distributed LLM Serving Benchmarks with NVIDIA srt-slurm, SLURM Recipes, Parameter Sweeps, and Pareto Analysis"},"content":{"rendered":"

In this tutorial, we explore NVIDIA\u2019s srt-slurm<\/strong><\/a> <\/strong>framework and learn how we use srtctl to convert declarative YAML configurations into reproducible SLURM benchmark workflows for distributed LLM serving. We set up the project in Google Colab, inspect its internal architecture, define a cluster configuration, dry-run built-in and custom recipes, and model a disaggregated prefill-and-decode deployment for DeepSeek-R1. We also generate parameter sweeps, interact with the typed Python API, validate expanded configurations, and analyze simulated benchmark results through a throughput-versus-latency Pareto frontier. Although Colab does not provide a real SLURM environment, we use it as a practical development workspace to understand, validate, and prepare production-grade benchmark recipes before we submit them to an actual GPU cluster.<\/p>\n

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import os, sys, subprocess, textwrap, json, shutil, importlib\nfrom pathlib import Path\ndef run(cmd, check=True, quiet=False):\n   \"\"\"Run a shell command, stream output.\"\"\"\n   print(f\"n$ {cmd}\")\n   r = subprocess.run(cmd, shell=True, text=True, capture_output=True)\n   out = (r.stdout or \"\") + (r.stderr or \"\")\n   if not quiet:\n       print(out[-6000:])\n   if check and r.returncode != 0:\n       raise RuntimeError(f\"Command failed ({r.returncode}): {cmd}\")\n   return out\ndef section(title):\n   print(\"n\" + \"\u2550\"*78 + f\"n {title}n\" + \"\u2550\"*78)\nsection(\"1. Install srt-slurm\")\nREPO = Path(\"\/content\/srt-slurm\") if Path(\"\/content\").exists() else Path.cwd()\/\"srt-slurm\"\nif not REPO.exists():\n   run(f\"git clone --depth 1 https:\/\/github.com\/NVIDIA\/srt-slurm.git {REPO}\", quiet=True)\nrun(f\"{sys.executable} -m pip install -q -e {REPO}\", quiet=True)\nsys.path.insert(0, str(REPO \/ \"src\"))\nimportlib.invalidate_caches()\nos.chdir(REPO)\nrun(\"srtctl --help\")\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We prepare the Colab environment by importing the required modules and defining reusable helper functions for command execution and section formatting. We clone the NVIDIA srt-slurm repository, install it in editable mode, and expose its source directory to the active Python runtime. We then switch to the repository directory and verify that the srtctl command-line interface is installed correctly.<\/p>\n
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section(\"2. Repository architecture\")\nprint(textwrap.dedent(\"\"\"\n   src\/srtctl\/\n     cli\/        submit.py (apply\/dry-run\/preflight\/monitor), do_sweep, interactive\n     core\/       schema.py (typed config), sweep.py, slurm.py (sbatch gen),\n                 validation.py, health.py, topology.py, fingerprint.py\n     backends\/   sglang.py, trtllm.py, vllm.py, mocker.py  \u2190 engine adapters\n     frontends\/  Dynamo \/ router frontends\n     templates\/  Jinja2 \u2192 sbatch + orchestrator scripts\n   recipes\/      ready-made benchmarks per platform (gb200-fp4, h100, b200-fp8,\n                 qwen3-32b, dsv4-pro, mocker smoke tests, ...)\n   analysis\/     srtlog (log parsers) + Streamlit dashboard (Pareto, latency...)\n   docs\/         sweeps.md, profiling.md, analyzing.md, config-reference.md\n\"\"\"))\nfor d in [\"recipes\", \"docs\"]:\n   print(f\"{d}\/ \u2192\", \", \".join(sorted(p.name for p in (REPO\/d).iterdir()))[:300])\nsection(\"3. Cluster configuration (srtslurm.yaml)\")\n(REPO\/\"srtslurm.yaml\").write_text(textwrap.dedent(\"\"\"\n   cluster: \"colab-demo\"\n   default_account: \"demo-account\"\n   default_partition: \"gpu\"\n   default_time_limit: \"01:00:00\"\n   gpus_per_node: 4\n   use_gpus_per_node_directive: true\n   use_segment_sbatch_directive: true\n   containers:\n     dynamo-sglang: \"\/containers\/dynamo-sglang.sqsh\"\n     lmsysorg+sglang+v0.5.5.post2.sqsh: \"\/containers\/sglang-v0.5.5.sqsh\"\n   model_paths:\n     deepseek-r1: \"\/models\/DeepSeek-R1\"\n\"\"\"))\nprint((REPO\/\"srtslurm.yaml\").read_text())\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We inspect the repository structure to understand how srtctl organizes its command-line tools, schemas, backends, templates, recipes, and analysis components. We then create a local srtslurm.yaml file containing simulated cluster defaults, container aliases, GPU settings, and model paths. We use this configuration to resolve recipe references in Colab without requiring access to an actual SLURM cluster.<\/p>\n
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section(\"4. Dry-run: mocker smoke test \u2192 generated sbatch script\")\nrun(\"srtctl dry-run -f recipes\/mocker\/agg.yaml\", check=False)\nsection(\"5. Custom disaggregated recipe (prefill\/decode split)\")\n(REPO\/\"my-disagg.yaml\").write_text(textwrap.dedent(\"\"\"\n   name: \"colab-disagg-demo\"\n   model:\n     path: \"deepseek-r1\"\n     container: \"lmsysorg+sglang+v0.5.5.post2.sqsh\"\n     precision: \"fp8\"\n   resources:\n     gpu_type: \"gb200\"\n     gpus_per_node: 4\n     prefill_nodes: 1\n     decode_nodes: 2\n     prefill_workers: 1\n     decode_workers: 2\n   backend:\n     prefill_environment: { PYTHONUNBUFFERED: \"1\" }\n     decode_environment:  { PYTHONUNBUFFERED: \"1\" }\n     sglang_config:\n       prefill:\n         served-model-name: \"deepseek-ai\/DeepSeek-R1\"\n         model-path: \"\/model\/\"\n         trust-remote-code: true\n         kv-cache-dtype: \"fp8_e4m3\"\n         tensor-parallel-size: 4\n         disaggregation-mode: \"prefill\"\n       decode:\n         served-model-name: \"deepseek-ai\/DeepSeek-R1\"\n         model-path: \"\/model\/\"\n         trust-remote-code: true\n         kv-cache-dtype: \"fp8_e4m3\"\n         tensor-parallel-size: 4\n         disaggregation-mode: \"decode\"\n   benchmark:\n     type: \"sa-bench\"\n     isl: 1024\n     osl: 1024\n     concurrencies: [64, 128, 256]\n     req_rate: \"inf\"\n\"\"\"))\nrun(\"srtctl dry-run -f my-disagg.yaml\", check=False)\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We dry-run the built-in mocker recipe to examine how srtctl validates configurations and generates SLURM submission artifacts without executing a real benchmark. We then define an advanced DeepSeek-R1 recipe that separates prefill and decode workloads across independent node and worker pools. We validate this disaggregated SGLang configuration through another dry run and inspect how the serving parameters are translated into job scripts.<\/p>\n
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section(\"6. Parameter sweep (grid search) \u2014 dry-run + expansion on disk\")\nrun(\"srtctl dry-run -f examples\/example-sweep.yaml\", check=False)\nsweep_dirs = sorted((REPO\/\"dry-runs\").glob(\"example-sweep_sweep_*\"))\nif sweep_dirs:\n   latest = sweep_dirs[-1]\n   print(\"Per-job configs generated by the sweep expander:\")\n   for p in sorted(latest.rglob(\"config.yaml\")):\n       print(\"  \", p.relative_to(REPO))\nsection(\"7. Programmatic use of srtctl's Python API\")\nimport yaml\nfrom srtctl.core.config import load_config\nfrom srtctl.core.sweep import generate_sweep_configs, expand_template\nfrom srtctl.core.schema import BenchmarkType, Precision, GpuType\ncfg = load_config(\"my-disagg.yaml\")\nprint(f\"Loaded  : {cfg.name}\")\nprint(f\"Model   : {cfg.model.path} ({cfg.model.precision}) on {cfg.resources.gpu_type}\")\nprint(f\"Layout  : {cfg.resources.prefill_nodes}P + {cfg.resources.decode_nodes}D nodes, \"\n     f\"{cfg.resources.gpus_per_node} GPUs\/node\")\nprint(f\"Bench   : {cfg.benchmark.type} isl={cfg.benchmark.isl} osl={cfg.benchmark.osl} \"\n     f\"concurrencies={cfg.benchmark.concurrencies}\")\nprint(f\"Enums   : benchmarks={[b.value for b in BenchmarkType]}\")\nprint(f\"          precisions={[p.value for p in Precision]}, gpus={[g.value for g in GpuType]}\")\nraw_sweep = yaml.safe_load(Path(\"examples\/example-sweep.yaml\").read_text())\njobs = generate_sweep_configs(raw_sweep)\nprint(f\"nSweep expands to {len(jobs)} jobs:\")\nfor job_cfg, params in jobs:\n   pf = job_cfg[\"backend\"][\"sglang_config\"][\"prefill\"]\n   print(f\"  {params}  \u2192 chunked-prefill-size={pf['chunked-prefill-size']}, \"\n         f\"max-total-tokens={pf['max-total-tokens']}\")\nprint(\"nTemplate substitution:\",\n     expand_template({\"flag\": \"{x}\", \"n\": \"{y}\"}, {\"x\": 4096, \"y\": 2}))\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We execute the example parameter sweep and inspect the individual job configurations created from its Cartesian search space. We load our custom recipe through the typed Python API and examine its model, precision, GPU topology, benchmark settings, and supported enumeration values. We also programmatically expand sweep templates and verify how each parameter combination affects the generated backend configuration.<\/p>\n
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section(\"8. Analysis: Pareto frontier from (simulated) benchmark results\")\nimport numpy as np, matplotlib.pyplot as plt\nrng = np.random.default_rng(0)\ndef simulate(variant, base_tps, base_itl):\n   rows = []\n       tps_gpu = base_tps * c \/ (c + 90) * rng.uniform(.97, 1.03)\n       itl     = base_itl * (1 + c\/220) * rng.uniform(.97, 1.03)\n       rows.append({\"variant\": variant, \"concurrency\": c,\n                    \"tok_s_gpu\": tps_gpu, \"itl_ms\": itl})\n   return rows\nresults = simulate(\"chunked=4096\", 260, 9.5) + simulate(\"chunked=8192\", 300, 11.5)\nprint(json.dumps(results[:3], indent=2), \"...\")\nplt.figure(figsize=(8, 5))\nfor variant in (\"chunked=4096\", \"chunked=8192\"):\n   pts = [(r[\"itl_ms\"], r[\"tok_s_gpu\"], r[\"concurrency\"])\n          for r in results if r[\"variant\"] == variant]\n   xs, ys, cs = zip(*pts)\n   plt.plot(xs, ys, \"o-\", label=variant)\n   for x, y, c in pts:\n       plt.annotate(str(c), (x, y), fontsize=7, xytext=(3, 3),\n                    textcoords=\"offset points\")\nplt.xlabel(\"Inter-token latency (ms\/token)  \u2192  worse\")\nplt.ylabel(\"Throughput (tokens\/s\/GPU)  \u2192  better\")\nplt.title(\"Pareto frontier: sweep variants (points labeled by concurrency)\")\nplt.legend(); plt.grid(alpha=.3); plt.tight_layout(); plt.show()\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We simulate benchmark observations for two chunked-prefill variants across increasing concurrency levels. We calculate representative throughput per GPU and inter-token latency values to model the saturation and latency growth commonly observed in distributed serving systems. We then visualize these results in a Pareto-style plot to compare throughput and responsiveness across configurations.<\/p>\n
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section(\"9. Next steps on a real cluster\")\nprint(textwrap.dedent(\"\"\"\n   make setup ARCH=aarch64|x86_64\n   srtctl preflight -f my-disagg.yaml\n   srtctl apply -f my-disagg.yaml\n   srtctl apply -f sweep.yaml\n   srtctl monitor\n   uv run streamlit run analysis\/dashboard\/app.py\n   srtctl diff runA runB\n   Logs land in outputs\/{JOB_ID}\/logs\/;  analysis\/srtlog parses them\n   (NodeAnalyzer, RunLoader) for programmatic post-processing.\n   Reproducibility tip (srtctl also prints this in dry-run): add an\n   identity: block to your recipe \u2014 HF model repo + revision, container\n   image URI, and framework versions \u2014 so srtctl can verify the runtime\n   matches your declaration at job start.\n\"\"\"))\nprint(\"\"\u2705\" Tutorial complete.\")\n<\/code><\/pre>\n<\/div>\n<\/div>\n
We outline the production workflow that we follow when transferring validated recipes from Colab to a real SLURM-based GPU cluster. We review the commands used for environment setup, preflight validation, job submission, sweep execution, monitoring, dashboard analysis, and experiment comparison. We also emphasize reproducibility by declaring model revisions, container identities, and framework versions inside each benchmark recipe.<\/p>\n
In conclusion, we built a complete understanding of how srtctl structures, validates, expands, and prepares distributed LLM-serving benchmarks for execution on SLURM infrastructure. We moved from basic installation and repository inspection to advanced disaggregated serving configurations, Cartesian parameter sweeps, programmatic schema access, and benchmark-result analysis. We also saw how dry runs expose generated job artifacts and help us detect configuration problems before expensive cluster resources are allocated. With this workflow in place, we can confidently transfer our validated recipes to a real NVIDIA GPU cluster, run preflight checks, submit benchmark jobs, monitor execution, compare experiment fingerprints, and analyze performance trade-offs in a reproducible manner.<\/p>\n
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The post Validating Distributed LLM Serving Benchmarks with NVIDIA srt-slurm, SLURM Recipes, Parameter Sweeps, and Pareto Analysis<\/a> appeared first on MarkTechPost<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"
In this tutorial, we explore NVIDIA\u2019s srt-slurm framework and learn how we use srtctl to convert declarative YAML configurations into reproducible SLURM benchmark workflows for distributed LLM serving. We set up the project in Google Colab, inspect its internal architecture, define a cluster configuration, dry-run built-in and custom recipes, and model a disaggregated prefill-and-decode deployment for DeepSeek-R1. We also generate parameter sweeps, interact with the typed Python API, validate expanded configurations, and analyze simulated benchmark results through a throughput-versus-latency Pareto frontier. Although Colab does not provide a real SLURM environment, we use it as a practical development workspace to understand, validate, and prepare production-grade benchmark recipes before we submit them to an actual GPU cluster. Copy CodeCopiedUse a different Browser import os, sys, subprocess, textwrap, json, shutil, importlib from pathlib import Path def run(cmd, check=True, quiet=False): “””Run a shell command, stream output.””” print(f”n$ {cmd}”) r = subprocess.run(cmd, shell=True, text=True, capture_output=True) out = (r.stdout or “”) + (r.stderr or “”) if not quiet: print(out[-6000:]) if check and r.returncode != 0: raise RuntimeError(f”Command failed ({r.returncode}): {cmd}”) return out def section(title): print(“n” + “\u2550”*78 + f”n {title}n” + “\u2550”*78) section(“1. Install srt-slurm”) REPO = Path(“\/content\/srt-slurm”) if Path(“\/content”).exists() else Path.cwd()\/”srt-slurm” if not REPO.exists(): run(f”git clone –depth 1 https:\/\/github.com\/NVIDIA\/srt-slurm.git {REPO}”, quiet=True) run(f”{sys.executable} -m pip install -q -e {REPO}”, quiet=True) sys.path.insert(0, str(REPO \/ “src”)) importlib.invalidate_caches() os.chdir(REPO) run(“srtctl –help”) We prepare the Colab environment by importing the required modules and defining reusable helper functions for command execution and section formatting. We clone the NVIDIA srt-slurm repository, install it in editable mode, and expose its source directory to the active Python runtime. We then switch to the repository directory and verify that the srtctl command-line interface is installed correctly. Copy CodeCopiedUse a different Browser section(“2. Repository architecture”) print(textwrap.dedent(“”” src\/srtctl\/ cli\/ submit.py (apply\/dry-run\/preflight\/monitor), do_sweep, interactive core\/ schema.py (typed config), sweep.py, slurm.py (sbatch gen), validation.py, health.py, topology.py, fingerprint.py backends\/ sglang.py, trtllm.py, vllm.py, mocker.py \u2190 engine adapters frontends\/ Dynamo \/ router frontends templates\/ Jinja2 \u2192 sbatch + orchestrator scripts recipes\/ ready-made benchmarks per platform (gb200-fp4, h100, b200-fp8, qwen3-32b, dsv4-pro, mocker smoke tests, …) analysis\/ srtlog (log parsers) + Streamlit dashboard (Pareto, latency…) docs\/ sweeps.md, profiling.md, analyzing.md, config-reference.md “””)) for d in [“recipes”, “docs”]: print(f”{d}\/ \u2192”, “, “.join(sorted(p.name for p in (REPO\/d).iterdir()))[:300]) section(“3. Cluster configuration (srtslurm.yaml)”) (REPO\/”srtslurm.yaml”).write_text(textwrap.dedent(“”” cluster: “colab-demo” default_account: “demo-account” default_partition: “gpu” default_time_limit: “01:00:00” gpus_per_node: 4 use_gpus_per_node_directive: true use_segment_sbatch_directive: true containers: dynamo-sglang: “\/containers\/dynamo-sglang.sqsh” lmsysorg+sglang+v0.5.5.post2.sqsh: “\/containers\/sglang-v0.5.5.sqsh” model_paths: deepseek-r1: “\/models\/DeepSeek-R1” “””)) print((REPO\/”srtslurm.yaml”).read_text()) We inspect the repository structure to understand how srtctl organizes its command-line tools, schemas, backends, templates, recipes, and analysis components. We then create a local srtslurm.yaml file containing simulated cluster defaults, container aliases, GPU settings, and model paths. We use this configuration to resolve recipe references in Colab without requiring access to an actual SLURM cluster. Copy CodeCopiedUse a different Browser section(“4. Dry-run: mocker smoke test \u2192 generated sbatch script”) run(“srtctl dry-run -f recipes\/mocker\/agg.yaml”, check=False) section(“5. Custom disaggregated recipe (prefill\/decode split)”) (REPO\/”my-disagg.yaml”).write_text(textwrap.dedent(“”” name: “colab-disagg-demo” model: path: “deepseek-r1” container: “lmsysorg+sglang+v0.5.5.post2.sqsh” precision: “fp8” resources: gpu_type: “gb200” gpus_per_node: 4 prefill_nodes: 1 decode_nodes: 2 prefill_workers: 1 decode_workers: 2 backend: prefill_environment: { PYTHONUNBUFFERED: “1” } decode_environment: { PYTHONUNBUFFERED: “1” } sglang_config: prefill: served-model-name: “deepseek-ai\/DeepSeek-R1” model-path: “\/model\/” trust-remote-code: true kv-cache-dtype: “fp8_e4m3” tensor-parallel-size: 4 disaggregation-mode: “prefill” decode: served-model-name: “deepseek-ai\/DeepSeek-R1” model-path: “\/model\/” trust-remote-code: true kv-cache-dtype: “fp8_e4m3” tensor-parallel-size: 4 disaggregation-mode: “decode” benchmark: type: “sa-bench” isl: 1024 osl: 1024 concurrencies: [64, 128, 256] req_rate: “inf” “””)) run(“srtctl dry-run -f my-disagg.yaml”, check=False) We dry-run the built-in mocker recipe to examine how srtctl validates configurations and generates SLURM submission artifacts without executing a real benchmark. We then define an advanced DeepSeek-R1 recipe that separates prefill and decode workloads across independent node and worker pools. We validate this disaggregated SGLang configuration through another dry run and inspect how the serving parameters are translated into job scripts. Copy CodeCopiedUse a different Browser section(“6. Parameter sweep (grid search) \u2014 dry-run + expansion on disk”) run(“srtctl dry-run -f examples\/example-sweep.yaml”, check=False) sweep_dirs = sorted((REPO\/”dry-runs”).glob(“example-sweep_sweep_*”)) if sweep_dirs: latest = sweep_dirs[-1] print(“Per-job configs generated by the sweep expander:”) for p in sorted(latest.rglob(“config.yaml”)): print(” “, p.relative_to(REPO)) section(“7. Programmatic use of srtctl’s Python API”) import yaml from srtctl.core.config import load_config from srtctl.core.sweep import generate_sweep_configs, expand_template from srtctl.core.schema import BenchmarkType, Precision, GpuType cfg = load_config(“my-disagg.yaml”) print(f”Loaded : {cfg.name}”) print(f”Model : {cfg.model.path} ({cfg.model.precision}) on {cfg.resources.gpu_type}”) print(f”Layout : {cfg.resources.prefill_nodes}P + {cfg.resources.decode_nodes}D nodes, ” f”{cfg.resources.gpus_per_node} GPUs\/node”) print(f”Bench : {cfg.benchmark.type} isl={cfg.benchmark.isl} osl={cfg.benchmark.osl} ” f”concurrencies={cfg.benchmark.concurrencies}”) print(f”Enums : benchmarks={[b.value for b in BenchmarkType]}”) print(f” precisions={[p.value for p in Precision]}, gpus={[g.value for g in GpuType]}”) raw_sweep = yaml.safe_load(Path(“examples\/example-sweep.yaml”).read_text()) jobs = generate_sweep_configs(raw_sweep) print(f”nSweep expands to {len(jobs)} jobs:”) for job_cfg, params in jobs: pf = job_cfg[“backend”][“sglang_config”][“prefill”] print(f” {params} \u2192 chunked-prefill-size={pf[‘chunked-prefill-size’]}, ” f”max-total-tokens={pf[‘max-total-tokens’]}”) print(“nTemplate substitution:”, expand_template({“flag”: “{x}”, “n”: “{y}”}, {“x”: 4096, “y”: 2})) We execute the example parameter sweep and inspect the individual job configurations created from its Cartesian search space. We load our custom recipe through the typed Python API and examine its model, precision, GPU topology, benchmark settings, and supported enumeration values. We also programmatically expand sweep templates and verify how each parameter combination affects the generated backend configuration. Copy CodeCopiedUse a different Browser section(“8. Analysis: Pareto frontier from (simulated) benchmark results”) import numpy as np, matplotlib.pyplot as plt rng = np.random.default_rng(0) def simulate(variant, base_tps, base_itl): rows = [] tps_gpu = base_tps * c \/ (c + 90) * rng.uniform(.97, 1.03) itl = base_itl * (1 + c\/220) * rng.uniform(.97, 1.03) rows.append({“variant”: variant, “concurrency”: c, “tok_s_gpu”: tps_gpu, “itl_ms”: itl}) return rows results = simulate(“chunked=4096”, 260, 9.5) + simulate(“chunked=8192”, 300, 11.5) print(json.dumps(results[:3], indent=2), “…”) plt.figure(figsize=(8, 5)) for variant in (“chunked=4096”, “chunked=8192”): pts = [(r[“itl_ms”], r[“tok_s_gpu”], r[“concurrency”]) for r in results if r[“variant”] == variant] xs, ys, cs = zip(*pts) plt.plot(xs, ys, “o-“, label=variant) for x, y, c in pts: plt.annotate(str(c), (x, y), fontsize=7, xytext=(3, 3), textcoords=”offset points”) plt.xlabel(“Inter-token latency (ms\/token) \u2192 worse”) plt.ylabel(“Throughput (tokens\/s\/GPU) \u2192 better”) plt.title(“Pareto frontier: sweep variants (points labeled by concurrency)”) plt.legend(); plt.grid(alpha=.3); plt.tight_layout(); plt.show() We simulate benchmark observations for two chunked-prefill variants across increasing concurrency levels. 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