Phase 0: fresh vllm 0.18.1 + mooncake-transfer-engine on dash1/dash2

Install script lives in microbench/fresh_setup/install.sh. Single shared
venv at /home/admin/cpfs/wjh/agentic-kv-fresh/.venv (cpfs is mounted at
the same path on dash0/1/2 so one install serves all three).

  vllm                    : 0.18.1   (official wheel)
  mooncake-transfer-engine: 0.3.11.post1

Smoke-tested on dash1 + dash2: imports succeed, kv_transfer module
resolves. This venv is the vanilla reference for all subsequent
microbench / PD-disagg experiments — not the dash0 patched build that
carries the connector_tax fix.

The script defines proxyOn inline (ipads 127.0.0.1:11235) so it works
under non-interactive ssh (~/.bashrc proxyOn is interactive-only).
Sets -eo pipefail (not -u) because venv activation references unset
PS1-like vars under -u.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

microbench/fresh_setup/install.sh

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+# Fresh-vllm + Mooncake install for microbench (Phase 0).
+#
+# Idempotent. Runs from any dash machine that mounts /home/admin/cpfs/wjh/.
+# Single venv at FRESH_ROOT/.venv is shared by all dash hosts (cpfs is mounted
+# at the same path on dash0/1/2).
+#
+# Usage on each host:
+#   bash microbench/fresh_setup/install.sh
+
+set -eo pipefail
+# Note: NOT -u; bashrc / venv activation reference unset vars (PS1, etc.).
+
+FRESH_ROOT="/home/admin/cpfs/wjh/agentic-kv-fresh"
+VENV_DIR="${FRESH_ROOT}/.venv"
+VLLM_VERSION="0.18.1"
+
+mkdir -p "${FRESH_ROOT}"
+cd "${FRESH_ROOT}"
+
+# 1. uv venv (Python 3.12). Skip if already exists and is valid.
+if [[ ! -f "${VENV_DIR}/bin/python" ]]; then
+    echo "[install] creating venv at ${VENV_DIR}"
+    uv venv --python 3.12 "${VENV_DIR}"
+else
+    echo "[install] venv exists at ${VENV_DIR}, reusing"
+fi
+
+# 2. Set proxy + activate venv. Avoid sourcing bashrc directly (it has
+#    interactive-only stuff); define proxyOn locally instead.
+proxyOn() {
+    local p="http://ipads:ipads123@127.0.0.1:11235"
+    export http_proxy="$p" https_proxy="$p" all_proxy="$p"
+    echo "[install] proxy set: $p"
+}
+proxyOn
+
+# shellcheck disable=SC1090
+source "${VENV_DIR}/bin/activate"
+
+echo "[install] python: $(which python)  ($(python --version))"
+
+# 3. Install vllm wheel.
+if ! python -c "import vllm" 2>/dev/null; then
+    echo "[install] installing vllm==${VLLM_VERSION}"
+    uv pip install "vllm==${VLLM_VERSION}"
+else
+    INSTALLED=$(python -c "import vllm; print(vllm.__version__)")
+    echo "[install] vllm already installed: ${INSTALLED}"
+fi
+
+# 4. Install Mooncake transfer engine (vllm's standard kv_connector backend).
+# vllm 0.18.x mooncake connector imports mooncake.engine; the upstream package
+# is `mooncake-transfer-engine`.
+if ! python -c "import mooncake" 2>/dev/null; then
+    echo "[install] installing mooncake-transfer-engine"
+    uv pip install mooncake-transfer-engine
+else
+    echo "[install] mooncake already installed"
+fi
+
+# 5. Common test deps.
+uv pip install httpx pytest numpy
+
+# 6. Smoke-test imports.
+python - <<'PY'
+import vllm
+import mooncake
+print(f"[smoke] vllm        = {vllm.__version__}")
+print(f"[smoke] mooncake    = {getattr(mooncake, '__version__', 'unknown')}")
+import vllm.distributed.kv_transfer as kvt
+print(f"[smoke] kv_transfer = {kvt.__file__}")
+PY
+
+echo "[install] DONE"