[RUNTIME] support multiple devices in the same process (#757)

python/triton/runtime/jit.py

@@ -7,7 +7,7 @@ import inspect
 import os
 import subprocess
 import textwrap
-from collections import namedtuple
+from collections import defaultdict, namedtuple
 
 import torch
 
@@ -252,7 +252,7 @@ def {self.fn.__name__}({', '.join(self.arg_names)}, grid, num_warps=4, num_stage
     if stream is None and not warmup:
       stream = get_cuda_stream(device)
     try:
-      bin = cache[key]
+      bin = cache[device][key]
       if not warmup:
           bin.c_wrapper(grid_0, grid_1, grid_2, bin.num_warps, bin.shared, stream, bin.cu_function, triton.compiler.CompiledKernel.launch_enter_hook, triton.compiler.CompiledKernel.launch_exit_hook, bin, {args})
       return bin
@@ -271,12 +271,11 @@ def {self.fn.__name__}({', '.join(self.arg_names)}, grid, num_warps=4, num_stage
       for i, arg in constants.items():
         if callable(arg):
           raise TypeError(f"Callable constexpr at index {i} is not supported")
-      device = 0
       if not self._call_hook(key, signature, device, constants, num_warps, num_stages, extern_libs, configs):
         bin = triton.compile(self, signature, device, constants, num_warps, num_stages, extern_libs=extern_libs, configs=configs)
         if not warmup:
             bin.c_wrapper(grid_0, grid_1, grid_2, bin.num_warps, bin.shared, stream, bin.cu_function, triton.compiler.CompiledKernel.launch_enter_hook, triton.compiler.CompiledKernel.launch_exit_hook, bin, *args)
-        self.cache[key] = bin
+        self.cache[device][key] = bin
         return bin
       return None
 """
@@ -301,7 +300,7 @@ def {self.fn.__name__}({', '.join(self.arg_names)}, grid, num_warps=4, num_stage
         self.src = textwrap.dedent(inspect.getsource(fn))
         self.src = self.src[self.src.find("def"):]
         # cache of just-in-time compiled kernels
-        self.cache = dict()
+        self.cache = defaultdict(dict)
         self.hash = None
         # JITFunction can be instantiated as kernel
         # when called with a grid using __getitem__