[float8] add float8 training benchmarking scripts (#1802)

* add float8 training benchmarking scripts

* move to benchmarks/float8/training

benchmarks/float8/README.md

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+# Float8 training benchmarking
+
+The `float8_training_benchmark.sh` script in this directory can be used to launch a Llama3 8b training run with [torchtitan](/~https://github.com/pytorch/torchtitan) training run, and parse the logs to calculate the median tokens/sec and peak memory usage for you.
+
+## Usage
+
+Example: `TORCHTITAN_ROOT=${HOME}/torchtitan FLOAT8_RECIPE=rowwise ./float8_training_benchmark.sh`
+
+Training parameters can be configured via environment variables.
+
+- Required:
+    - `TORCHTITAN_ROOT`
+- Optional:
+    - `RECIPE`: rowwise|tensorwise. defaults to tensorwise.
+    - `BATCH_SIZE`: defaults to 1.
+    - `STEPS`: defaults to 100.
+
+**NOTE**: `torch.compile` and FSDP2 are always used. Other forms of parallelism supported in torchtitan are not yet supported in this script.

benchmarks/float8/training/float8_training_benchmark.sh

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+#!/bin/bash
+# This script can be used to launch a torchtitan float8 training run
+# with the given parameters,
+
+# script arguments
+BATCH_SIZE=${BATCH_SIZE:-1}
+STEPS=${STEPS:-100}
+
+# temporary log file which is deleted after performance data is parsed out and metrics are calculated.
+LOG_FILE="/tmp/float8_training_log.txt"
+
+# validate user has specified torchtitan root directory
+if [ -z "${TORCHTITAN_ROOT}" ]; then
+  echo "Error: TORCHTITAN environment variable is not set. Please set it before running this script."
+  echo "Usage: TORCHTITAN_ROOT=<directory> ./float8_training_benchmark.sh"
+  echo "Optional parameters configurable via environment variables:"
+  echo " * FLOAT8_RECIPE: "rowwise" or "tensorwise". if set, use float8 training with the specified recipe. otherwise, use bf16 mixed precision training."
+  echo " * BATCH_SIZE: defaults to 1."
+  echo " * STEPS: defaults to 100."
+  exit 1
+fi
+
+# validate recipe name
+if [ -n "${FLOAT8_RECIPE}" ]; then
+  FLOAT8_ARGS="--model.converters="float8" --float8.recipe_name=${FLOAT8_RECIPE}"
+fi
+
+
+# remember current directory to return to it later
+original_dir=$(pwd)
+
+# navigate to torchtitan root dir
+cd ${TORCHTITAN_ROOT}
+
+echo "float8 args: ${FLOAT8_ARGS}"
+
+# run the command with the specified arguments
+CONFIG_FILE="./torchtitan/models/llama/train_configs/llama3_8b.toml" ${TORCHTITAN_ROOT}/run_train.sh --training.steps=${STEPS} --training.batch_size=${BATCH_SIZE} --training.compile ${FLOAT8_ARGS} 2>&1 | tee ${LOG_FILE}
+
+# return to original working directory
+cd $original_dir
+
+# parse logs to calculate top line metrics
+python parse_torchtitan_logs.py --log-file ${LOG_FILE}
+
+# clean up logs
+rm ${LOG_FILE}

benchmarks/float8/training/parse_torchtitan_logs.py

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+#!/usr/bin/env python3
+"""
+Script which can be used to parse the log file generated by the torchtitan,
+and calculate the training performance metrics (mdian tokens/second and peak memory usage).
+
+Usage:
+    python parse_torchtitan_logs.py --log-file <log_file_path>
+"""
+
+import os
+import re
+import statistics
+from argparse import ArgumentParser, Namespace
+
+
+def main(args: Namespace):
+    print("\n=====================================================")
+    print(" Calculating training performance metrics")
+    print("=====================================================")
+
+    log_pattern = re.compile(r"step: (\d+).*?memory: ([\d.]+)GiB.*?tps: ([\d,]+)")
+
+    assert os.path.exists(args.log_file), f"{args.log_file} does not exist"
+
+    with open(args.log_file, "r") as f:
+        log_data = f.read()
+
+    matches = re.findall(log_pattern, log_data)
+
+    tokens_per_second = []
+    max_memory_usage = 0.0
+    for match in matches:
+        step = int(match[0])
+        memory_usage = float(match[1])
+        tps = float(match[2].replace(",", ""))
+
+        # update peak memory usage
+        max_memory_usage = max(max_memory_usage, memory_usage)
+
+        # collect tokens per second, excluding step 1 which has initialization overhead
+        if step != 1:
+            tokens_per_second.append(tps)
+
+    # calculate median tokens per second
+    median_tps = statistics.median(tokens_per_second) if tokens_per_second else 0
+
+    print(f"Median Tokens/Second (excluding step 1): {median_tps}")
+    print(f"Max Memory Usage: {max_memory_usage} GiB")
+
+
+if __name__ == "__main__":
+    argparser = ArgumentParser()
+    argparser.add_argument(
+        "--log-file", type=str, required=True, help="torchtitan log file"
+    )
+    args = argparser.parse_args()
+    main(args)