Improve logging & add logit cap (#471)

benchmark/latency_throughput/test_latency.py

@@ -30,7 +30,7 @@ if __name__ == "__main__":
         response = requests.post(
             url + "/generate",
             json={
-                "text": f"{a}, ",
+                "text": f"The capital of France is",
                 # "input_ids": [[2] * 256] * 196,
                 "sampling_params": {
                     "temperature": 0,

python/sglang/srt/constrained/fsm_cache.py

@@ -6,6 +6,9 @@ class FSMCache(BaseCache):
     def __init__(self, tokenizer_path, tokenizer_args_dict, enable=True):
         super().__init__(enable=enable)
 
+        if tokenizer_path.endswith(".json"):
+            return
+
         from importlib.metadata import version
 
         if version("outlines") >= "0.0.35":

python/sglang/srt/hf_transformers_utils.py

@@ -84,6 +84,9 @@ def get_tokenizer(
     tokenizer_revision: Optional[str] = None,
     **kwargs,
 ) -> Union[PreTrainedTokenizer, PreTrainedTokenizerFast]:
+    if tokenizer_name.endswith(".json"):
+        return TiktokenTokenizer(tokenizer_name)
+
     """Gets a tokenizer for the given model name via Huggingface."""
     if is_multimodal_model(tokenizer_name):
         processor = get_processor(
@@ -170,3 +173,24 @@ def get_processor(
         **kwargs,
     )
     return processor
+
+
+class TiktokenTokenizer:
+    def __init__(self, tokenizer_path):
+        import xlm.tokenizers.tiktoken_wrapper as tiktoken_wrapper
+        tokenizer = tiktoken_wrapper.Encoding.from_xtok_json("xtok-json", tokenizer_path)
+        self.tokenizer = tokenizer
+        self.eos_token_id = tokenizer.eos_token
+        self.vocab_size = tokenizer.n_vocab
+
+    def encode(self, x):
+        return self.tokenizer.encode(x)
+
+    def decode(self, x):
+        return self.tokenizer.decode(x)
+
+    def batch_decode(self, batch, skip_special_tokens,  spaces_between_special_tokens):
+        return self.tokenizer.decode_batch(batch)
+
+    def convert_ids_to_tokens(self, index):
+        return self.tokenizer.decode_single_token_bytes(index).decode("utf-8", errors="ignore")
\ No newline at end of file

python/sglang/srt/layers/extend_attention.py

@@ -8,6 +8,12 @@ from sglang.srt.utils import wrap_kernel_launcher
 CUDA_CAPABILITY = torch.cuda.get_device_capability()
 
 
+@triton.jit
+def tanh(x):
+    # Tanh is just a scaled sigmoid
+    return 2 * tl.sigmoid(2 * x) - 1
+
+
 @triton.jit
 def _fwd_kernel(
     Q_Extend,
@@ -39,6 +45,7 @@ def _fwd_kernel(
     BLOCK_DMODEL: tl.constexpr,
     BLOCK_M: tl.constexpr,
     BLOCK_N: tl.constexpr,
+    logit_cap: tl.constexpr,
 ):
     cur_seq = tl.program_id(0)
     cur_head = tl.program_id(1)
@@ -90,6 +97,10 @@ def _fwd_kernel(
         qk = tl.zeros([BLOCK_M, BLOCK_N], dtype=tl.float32)
         qk += tl.dot(q, k)
         qk *= sm_scale
+
+        if logit_cap > 0:
+            qk = logit_cap * tanh(qk / logit_cap)
+
         qk = tl.where(mask_m[:, None] & mask_n[None, :], qk, float("-inf"))
 
         n_e_max = tl.maximum(tl.max(qk, 1), e_max)
@@ -126,6 +137,10 @@ def _fwd_kernel(
         qk = tl.zeros([BLOCK_M, BLOCK_N], dtype=tl.float32)
         qk += tl.dot(q, k)
         qk *= sm_scale
+
+        if logit_cap > 0:
+            qk = logit_cap * tanh(qk / logit_cap)
+
         mask_causual = (cur_block_m * BLOCK_M + offs_m[:, None]) >= (
             start_n + offs_n[None, :]
         )
@@ -176,6 +191,7 @@ def extend_attention_fwd(
     b_seq_len_extend,
     max_len_in_batch,
     max_len_extend,
+    logit_cap=-1,
 ):
     """
     q_extend, k_extend, v_extend, o_extend: contiguous tensors
@@ -271,6 +287,7 @@ def extend_attention_fwd(
         BLOCK_N=BLOCK_N,
         num_warps=num_warps,
         num_stages=num_stages,
+        logit_cap=logit_cap,
     )
     cached_kernel = wrap_kernel_launcher(_fwd_kernel)
 

python/sglang/srt/layers/radix_attention.py

 import torch
+import numpy as np
 from torch import nn
 
 from sglang.srt.layers.context_flashattention_nopad import context_attention_fwd
@@ -8,13 +9,16 @@ from sglang.srt.managers.router.model_runner import ForwardMode, InputMetadata
 
 
 class RadixAttention(nn.Module):
-    def __init__(self, num_heads, head_dim, scaling, num_kv_heads, layer_id):
+    def __init__(self, num_heads, head_dim, scaling, num_kv_heads, layer_id, logit_cap=-1):
         super().__init__()
         self.tp_q_head_num = num_heads
         self.tp_k_head_num = num_kv_heads
         self.tp_v_head_num = num_kv_heads
         self.head_dim = head_dim
         self.layer_id = layer_id
+        self.logit_cap = logit_cap
+
+        assert np.allclose(scaling, 1.0 / (head_dim**0.5))
 
         from sglang.srt.managers.router.model_runner import global_server_args_dict
 
@@ -38,6 +42,7 @@ class RadixAttention(nn.Module):
             input_metadata.start_loc,
             input_metadata.seq_lens,
             input_metadata.max_seq_len,
+            self.logit_cap,
         )
         self.store_kv_cache(k, v, input_metadata)
 
@@ -62,6 +67,7 @@ class RadixAttention(nn.Module):
             input_metadata.extend_seq_lens,
             input_metadata.max_seq_len,
             input_metadata.max_extend_len,
+            self.logit_cap,
         )
 
         return o
@@ -82,6 +88,7 @@ class RadixAttention(nn.Module):
             input_metadata.max_seq_len,
             input_metadata.other_kv_index,
             input_metadata.total_num_tokens,
+            self.logit_cap,
         )
 
         return o

python/sglang/srt/layers/token_attention.py

@@ -16,6 +16,12 @@ else:
     REDUCE_TORCH_TYPE = torch.float16
 
 
+@triton.jit
+def tanh(x):
+    # Tanh is just a scaled sigmoid
+    return 2 * tl.sigmoid(2 * x) - 1
+
+
 @triton.jit
 def _fwd_kernel_stage1(
     Q,
@@ -35,6 +41,7 @@ def _fwd_kernel_stage1(
     kv_group_num: tl.constexpr,
     BLOCK_DMODEL: tl.constexpr,
     BLOCK_N: tl.constexpr,
+    logit_cap: tl.constexpr,
 ):
     cur_batch = tl.program_id(0)
     cur_head = tl.program_id(1)
@@ -77,6 +84,10 @@ def _fwd_kernel_stage1(
         ).to(REDUCE_TRITON_TYPE)
         att_value = tl.sum(q[None, :] * k, 1)
         att_value *= sm_scale
+
+        if logit_cap > 0:
+            att_value = logit_cap * tanh(att_value / logit_cap)
+
         off_o = cur_head * att_stride_h + (cur_batch_in_all_start_index + offs_n)
         tl.store(Att_Out + off_o, att_value, mask=offs_n_new < cur_batch_end_index)
 
@@ -165,6 +176,7 @@ def _token_att_m_fwd(
     B_Start_Loc,
     B_Seqlen,
     max_len_in_batch,
+    logit_cap,
 ):
     BLOCK = 32
     # shape constraints
@@ -223,6 +235,7 @@ def _token_att_m_fwd(
         kv_group_num=kv_group_num,
         BLOCK_DMODEL=Lk,
         BLOCK_N=BLOCK,
+        logit_cap=logit_cap,
         num_warps=num_warps,
         num_stages=1,
     )
@@ -304,6 +317,7 @@ def token_attention_fwd(
     max_len_in_batch,
     other_kv_index,
     total_num_tokens,
+    logit_cap=-1,
     att_m=None,
 ):
     if att_m is None:
@@ -320,6 +334,7 @@ def token_attention_fwd(
         b_start_loc,
         b_seq_len,
         max_len_in_batch,
+        logit_cap,
     )
     _token_softmax_reducev_fwd(
         att_m,

python/sglang/srt/managers/detokenizer_manager.py

 import asyncio
+import inspect
 
 import uvloop
 import zmq
@@ -7,7 +8,7 @@ import zmq.asyncio
 from sglang.srt.hf_transformers_utils import get_tokenizer
 from sglang.srt.managers.io_struct import BatchStrOut, BatchTokenIDOut
 from sglang.srt.server_args import PortArgs, ServerArgs
-from sglang.utils import get_exception_traceback
+from sglang.utils import get_exception_traceback, graceful_registry
 
 asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
 
@@ -85,6 +86,8 @@ def start_detokenizer_process(
     port_args: PortArgs,
     pipe_writer,
 ):
+    graceful_registry(inspect.currentframe().f_code.co_name)
+
     try:
         manager = DetokenizerManager(server_args, port_args)
     except Exception as e:

python/sglang/srt/managers/router/model_rpc.py

@@ -106,8 +106,7 @@ class ModelRpcServer:
         set_random_seed(server_args.random_seed)
 
         # Print info
-        logger.info(
-            f"Rank {self.tp_rank}: "
+        logger.info(f"[rank={self.tp_rank}] "
             f"max_total_num_token={self.max_total_num_token}, "
             f"max_prefill_num_token={self.max_prefill_num_token}, "
             f"context_len={self.model_config.context_len}, "
@@ -752,7 +751,7 @@ def _init_service(port):
         protocol_config={
             "allow_public_attrs": True,
             "allow_pickle": True,
-            "sync_request_timeout": 1800,
+            "sync_request_timeout": 3600,
         },
     )
     t.start()
@@ -772,7 +771,7 @@ def start_model_process(port):
                 config={
                     "allow_public_attrs": True,
                     "allow_pickle": True,
-                    "sync_request_timeout": 1800,
+                    "sync_request_timeout": 3600,
                 },
             )
             break

python/sglang/srt/managers/router/model_runner.py

@@ -235,8 +235,8 @@ class ModelRunner:
         }
 
         # Init torch distributed
-        logger.debug("Init torch begin.")
         torch.cuda.set_device(self.tp_rank)
+        logger.info(f"[rank={self.tp_rank}] Init torch begin. Avail mem={get_available_gpu_memory(self.tp_rank):.2f} GB")
         torch.distributed.init_process_group(
             backend="nccl",
             world_size=self.tp_size,
@@ -244,20 +244,22 @@ class ModelRunner:
             init_method=f"tcp://127.0.0.1:{self.nccl_port}",
         )
         initialize_model_parallel(tensor_model_parallel_size=self.tp_size)
-        logger.debug("Init torch end.")
+        logger.info(f"[rank={self.tp_rank}] Init torch end.")
+
+        total_gpu_memory = get_available_gpu_memory(self.tp_rank, distributed=self.tp_size > 1)
+
+        if self.tp_size > 1:
+            total_local_gpu_memory = get_available_gpu_memory(self.tp_rank)
+            if total_local_gpu_memory < total_gpu_memory * 0.9:
+                raise ValueError("The memory capacity is unbalanced. Some GPUs may be occupied by other processes.")
 
-        total_gpu_memory = get_available_gpu_memory(
-            self.tp_rank, distributed=self.tp_size > 1
-        ) * (1 << 30)
-        # logger.info(f"Before: {get_available_gpu_memory(self.tp_rank, False):.2f} GB")
         self.load_model()
-        # logger.info(f"After: {get_available_gpu_memory(self.tp_rank, False):.2f} GB")
         self.init_memory_pool(total_gpu_memory)
 
         self.is_multimodal_model = is_multimodal_model(self.model_config)
 
     def load_model(self):
-        logger.info(f"Rank {self.tp_rank}: load weight begin.")
+        logger.info(f"[rank={self.tp_rank}] Load weight begin.")
 
         device_config = DeviceConfig()
         load_config = LoadConfig(load_format=self.server_args.load_format)
@@ -283,19 +285,19 @@ class ModelRunner:
             parallel_config=None,
             scheduler_config=None,
         )
-        logger.info(f"Rank {self.tp_rank}: load weight end. {type(self.model)}")
+        logger.info(f"[rank={self.tp_rank}] Load weight end. "
+                    f"Type={type(self.model).__name__}. "
+                    f"Avail mem={get_available_gpu_memory(self.tp_rank):.2f} GB")
 
     def profile_max_num_token(self, total_gpu_memory):
-        available_gpu_memory = get_available_gpu_memory(
-            self.tp_rank, distributed=self.tp_size > 1
-        ) * (1 << 30)
+        available_gpu_memory = get_available_gpu_memory(self.tp_rank, distributed=self.tp_size > 1)
         head_dim = self.model_config.head_dim
         head_num = self.model_config.num_key_value_heads // self.tp_size
         cell_size = head_num * head_dim * self.model_config.num_hidden_layers * 2 * 2
         rest_memory = available_gpu_memory - total_gpu_memory * (
             1 - self.mem_fraction_static
         )
-        max_num_token = int(rest_memory // cell_size)
+        max_num_token = int(rest_memory * (1 << 30) // cell_size)
         return max_num_token
 
     def init_memory_pool(self, total_gpu_memory):

python/sglang/srt/server.py

@@ -203,7 +203,6 @@ def launch_server(server_args: ServerArgs, pipe_finish_writer, model_overide_arg
             time.sleep(0.5)
             try:
                 requests.get(url + "/get_model_info", timeout=5, headers=headers)
-                success = True  # Set flag to True if request succeeds
                 break
             except requests.exceptions.RequestException as e:
                 pass
@@ -213,7 +212,7 @@ def launch_server(server_args: ServerArgs, pipe_finish_writer, model_overide_arg
             res = requests.post(
                 url + "/generate",
                 json={
-                    "text": "Say this is a warmup request.",
+                    "text": "The capital city of France is",
                     "sampling_params": {
                         "temperature": 0,
                         "max_new_tokens": 16,

python/sglang/srt/utils.py

@@ -92,7 +92,7 @@ def calculate_time(show=False, min_cost_ms=0.0):
     return wrapper
 
 
-def get_available_gpu_memory(gpu_id, distributed=True):
+def get_available_gpu_memory(gpu_id, distributed=False):
     """
     Get available memory for cuda:gpu_id device.
     When distributed is True, the available memory is the minimum available memory of all GPUs.

python/sglang/utils.py

@@ -2,7 +2,8 @@
 
 import base64
 import json
-import os
+import logging
+import signal
 import sys
 import threading
 import traceback
@@ -15,6 +16,9 @@ import numpy as np
 import requests
 
 
+logger = logging.getLogger(__name__)
+
+
 def get_exception_traceback():
     etype, value, tb = sys.exc_info()
     err_str = "".join(traceback.format_exception(etype, value, tb))
@@ -247,3 +251,12 @@ def run_with_timeout(func, args=(), kwargs=None, timeout=None):
         raise RuntimeError()
 
     return ret_value[0]
+
+
+def graceful_registry(sub_module_name):
+    def graceful_shutdown(signum, frame):
+        logger.info(f"{sub_module_name} Received signal to shutdown. Performing graceful shutdown...")
+        if signum == signal.SIGTERM:
+            logger.info(f"{sub_module_name} recive sigterm")
+
+    signal.signal(signal.SIGTERM, graceful_shutdown)
\ No newline at end of file