[Nightly] Remove gen_ranktable logic (#4941)

### What this PR does / why we need it?
Since the `llmdatadist` has sunset, the logic gen_ranktable should also
be removed

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: wangli <wangli858794774@gmail.com>

tests/e2e/nightly/multi_node/config/models/DeepSeek-R1-W8A8-EPLB.yaml

@@ -18,8 +18,6 @@ disaggregated_prefill:
   enabled: true
   prefiller_host_index: [0, 1]
   decoder_host_index: [2]
-  ranktable_gen_path: "examples/disaggregated_prefill_v1/gen_ranktable.py"
-  ranktable_path: "/tmp/ranktable.json"
 
 deployment:
   -

tests/e2e/nightly/multi_node/config/models/DeepSeek-R1-W8A8.yaml

@@ -17,8 +17,6 @@ disaggregated_prefill:
   enabled: true
   prefiller_host_index: [0, 1]
   decoder_host_index: [2]
-  ranktable_gen_path: "examples/disaggregated_prefill_v1/gen_ranktable.py"
-  ranktable_path: "/tmp/ranktable.json"
 
 deployment:
   -

tests/e2e/nightly/multi_node/config/multi_node_config.py

@@ -113,9 +113,6 @@ class MultiNodeConfig:
             self.decode_start_index: int = decode_host_index[0]
             self.num_prefillers = self.decode_start_index
             self.num_decoders = self.num_nodes - self.num_prefillers
-            if self.disaggregated_prefill.get(
-                    "ranktable_gen_path") is not None:
-                self._gen_ranktable()
 
     def _init_dist_env(self):
         self.envs["HCCL_IF_IP"] = self.cur_ip
@@ -286,54 +283,3 @@ class MultiNodeConfig:
     @property
     def is_master(self):
         return self.cur_index == 0
-
-    def _gen_ranktable(self):
-        cluster_ip = [nodes.ip for nodes in self.nodes_info]
-        assert len(cluster_ip) > 0
-        nnodes = self.num_nodes
-        node_rank = self.cur_index
-        master_addr = cluster_ip[0]
-        master_port = DISAGGEGATED_PREFILL_PORT
-        assert self.disaggregated_prefill is not None
-        ranktable_gen_path = self.disaggregated_prefill.get(
-            "ranktable_gen_path")
-        ranktable_path = self.disaggregated_prefill.get("ranktable_path")
-        assert ranktable_gen_path is not None and ranktable_path is not None
-        if os.path.exists(str(ranktable_path)):
-            logger.info("ranktable has already generated")
-            return
-
-        local_host = self.cur_ip
-
-        cmd = [
-            "torchrun",
-            "--nproc_per_node",
-            "1",
-            "--nnodes",
-            str(nnodes),
-            "--node_rank",
-            str(node_rank),
-            "--master_addr",
-            master_addr,
-            "--master_port",
-            str(master_port),
-            ranktable_gen_path,
-            "--ranktable-path",
-            str(ranktable_path),
-            "--local-host",
-            local_host,
-            "--prefill-device-cnt",
-            str(self.npu_per_node * self.num_prefillers),
-            "--decode-device-cnt",
-            str(self.npu_per_node * self.num_decoders),
-        ]
-
-        env = os.environ.copy()
-        assert self.nic_name is not None
-        env["GLOO_SOCKET_IFNAME"] = self.nic_name
-
-        logger.info(
-            f"Generating ranktable from command: {' '.join(map(str, cmd))}")
-        subprocess.run(cmd, env=env, check=True)
-        assert os.path.exists(
-            str(ranktable_path)), "failed generate ranktable.json"