#!/usr/bin/env bash
# Clean, strictly-sequential single-stream latency + per-GPU VRAM for PP.
# One server at a time. Readiness = first SUCCESSFUL generation (xserv's /health
# returns 200 before the model finishes loading, so we must not gate on it).
# Snapshots are therefore always post-load. Writes bench-out/PP_CLEAN.md.
#
# Env overrides: MODEL, GGUF, PPS (default "1 2 4"), LLAMA_BIN.
set -u
cd "$(dirname "$0")/../.."
export PATH=$HOME/.cargo/bin:/usr/local/cuda-12.9/bin:$PATH
export CUDA_HOME=${CUDA_HOME:-/usr/local/cuda-12.9}
MODEL=${MODEL:-/opt/wjh/models/qwen3-8b}
GGUF=${GGUF:-/opt/wjh/models/qwen3-8b/qwen3-8b-bf16.gguf}
LLAMA_BIN=${LLAMA_BIN:-third_party/llama.cpp/build/bin/llama-server}
XBIN=./target/release/xserv-server
PPS=${PPS:-1 2 4}
PROMPT='Write a detailed paragraph explaining how GPUs accelerate neural network training.'
OUT=bench-out/PP_CLEAN.md
mkdir -p bench-out
: > "$OUT"
echo "# PP clean single-stream latency + VRAM — $(date)" >> "$OUT"
echo "" >> "$OUT"
echo "| engine | PP | TTFT_ms | TPOT_ms | tok/s | per-GPU VRAM (MiB) |" >> "$OUT"
echo "|--------|----|---------|---------|-------|--------------------|" >> "$OUT"

killall_servers(){ pkill -9 -f xserv-server 2>/dev/null; pkill -9 -f llama-server 2>/dev/null; sleep 3; }

drain(){ # wait until GPUs $1 (csv) all < 1500 MiB, max 120s
  for _ in $(seq 1 60); do
    local hi=0
    for g in ${1//,/ }; do
      m=$(nvidia-smi -i "$g" --query-gpu=memory.used --format=csv,noheader,nounits)
      [ "${m:-0}" -gt 1500 ] && hi=1
    done
    [ "$hi" -eq 0 ] && return 0; sleep 2
  done
}

# probe_ready PORT PID  -> 0 when a generation succeeds (deadline ~1200s)
probe_ready(){ local port=$1 pid=$2
  for _ in $(seq 1 400); do
    if curl -s -o /dev/null -w '%{http_code}' --max-time 8 \
        "http://127.0.0.1:$port/v1/chat/completions" -H 'Content-Type: application/json' \
        -d '{"model":"qwen3-8b","messages":[{"role":"user","content":"hi"}],"max_tokens":1,"temperature":0,"stream":false}' \
        2>/dev/null | grep -q 200; then return 0; fi
    kill -0 "$pid" 2>/dev/null || return 1
    sleep 3
  done; return 1
}

vram(){ local cvd=$1; local a b=""   # stabilized snapshot of GPUs $cvd
  for _ in $(seq 1 12); do
    a=$(for g in ${cvd//,/ }; do nvidia-smi -i "$g" --query-gpu=memory.used --format=csv,noheader,nounits; done | paste -sd' ')
    [ "$a" = "$b" ] && break; b=$a; sleep 2
  done; echo "$a"
}

run_xserv(){ local pp=$1; local cvd; cvd=$(seq -s, 0 $((pp-1)))
  killall_servers; drain "$cvd"
  local extra=""; [ "$pp" -gt 1 ] && extra="--pp $pp"
  XSERV_MAX_KV_BLOCKS=160 CUDA_VISIBLE_DEVICES=$cvd nohup $XBIN $MODEL --port 8090 --max-seq-len 2048 $extra >/tmp/x$pp.log 2>&1 &
  local pid=$!
  if ! probe_ready 8090 "$pid"; then echo "| xserv | $pp | FAILED (see /tmp/x$pp.log) | | | |" >> "$OUT"; kill -9 "$pid" 2>/dev/null; return; fi
  local mib; mib=$(vram "$cvd")
  local m; m=$(python3 tools/bench/pp_time.py http://127.0.0.1:8090 "$PROMPT")
  local ttft tpot toks; ttft=$(echo "$m"|sed -n 's/.*TTFT_ms=\([0-9.]*\).*/\1/p'); tpot=$(echo "$m"|sed -n 's/.*TPOT_ms=\([0-9.a-z]*\).*/\1/p'); toks=$(echo "$m"|sed -n 's/.*tok_s=\([0-9.a-z]*\).*/\1/p')
  echo "| xserv | $pp | $ttft | $tpot | $toks | $mib |" >> "$OUT"
  kill -9 "$pid" 2>/dev/null; wait "$pid" 2>/dev/null; sleep 3
}

run_llama(){ local pp=$1; local cvd; cvd=$(seq -s, 0 $((pp-1)))
  killall_servers; drain "$cvd"
  local sm=(-sm none); [ "$pp" -gt 1 ] && sm=(-sm layer -ts "$(printf '1%.0s,' $(seq 1 $pp) | sed 's/,$//')")
  CUDA_VISIBLE_DEVICES=$cvd nohup $LLAMA_BIN -m $GGUF --port 8090 --host 127.0.0.1 \
      -c 2048 --parallel 1 -ngl 999 "${sm[@]}" >/tmp/l$pp.log 2>&1 &
  local pid=$!
  if ! probe_ready 8090 "$pid"; then echo "| llama | $pp | FAILED (see /tmp/l$pp.log) | | | |" >> "$OUT"; kill -9 "$pid" 2>/dev/null; return; fi
  local mib; mib=$(vram "$cvd")
  local m; m=$(python3 tools/bench/pp_time.py http://127.0.0.1:8090 "$PROMPT")
  local ttft tpot toks; ttft=$(echo "$m"|sed -n 's/.*TTFT_ms=\([0-9.]*\).*/\1/p'); tpot=$(echo "$m"|sed -n 's/.*TPOT_ms=\([0-9.a-z]*\).*/\1/p'); toks=$(echo "$m"|sed -n 's/.*tok_s=\([0-9.a-z]*\).*/\1/p')
  echo "| llama | $pp | $ttft | $tpot | $toks | $mib |" >> "$OUT"
  kill -9 "$pid" 2>/dev/null; wait "$pid" 2>/dev/null; sleep 3
}

for pp in $PPS; do run_xserv "$pp"; done
for pp in $PPS; do run_llama "$pp"; done
killall_servers
echo "" >> "$OUT"
echo "PP_CLEAN_DONE" >> "$OUT"