[libc-commits] [libc] 03d362d - [libc][Docs] Update the GPU RPC documentation (#79069)

via libc-commits libc-commits at lists.llvm.org
Tue Jan 23 09:41:03 PST 2024


Author: Joseph Huber
Date: 2024-01-23T11:40:58-06:00
New Revision: 03d362db7463f3451692fa6a80204b35dfe95037

URL: https://github.com/llvm/llvm-project/commit/03d362db7463f3451692fa6a80204b35dfe95037
DIFF: https://github.com/llvm/llvm-project/commit/03d362db7463f3451692fa6a80204b35dfe95037.diff

LOG: [libc][Docs] Update the GPU RPC documentation (#79069)

Summary:
This adds some more concrete information on the RPC interface. Hopefully
this is intelligable and provides some useful examples.

Added: 
    libc/docs/gpu/rpc-diagram.svg

Modified: 
    libc/docs/gpu/rpc.rst
    libc/docs/gpu/testing.rst

Removed: 
    


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diff  --git a/libc/docs/gpu/rpc-diagram.svg b/libc/docs/gpu/rpc-diagram.svg
new file mode 100644
index 000000000000000..eb9b807e52004ee
--- /dev/null
+++ b/libc/docs/gpu/rpc-diagram.svg
@@ -0,0 +1 @@
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diff  --git a/libc/docs/gpu/rpc.rst b/libc/docs/gpu/rpc.rst
index b02053e2dc72a8c..78ae778671881a8 100644
--- a/libc/docs/gpu/rpc.rst
+++ b/libc/docs/gpu/rpc.rst
@@ -11,10 +11,298 @@ Remote Procedure Calls
 Remote Procedure Call Implementation
 ====================================
 
-Certain features from the standard C library, such as allocation or printing,
-require support from the operating system. We instead implement a remote
-procedure call (RPC) interface to allow submitting work from the GPU to a host
-server that forwards it to the host system.
+Traditionally, the C library abstracts over several functions that interface 
+with the platform's operating system through system calls. The GPU however does 
+not provide an operating system that can handle target dependent operations.
+Instead, we implemented remote procedure calls to interface with the host's 
+operating system while executing on a GPU.
+
+We implemented remote procedure calls using unified virtual memory to create a 
+shared communicate channel between the two processes. This memory is often 
+pinned memory that can be accessed asynchronously and atomically by multiple 
+processes simultaneously. This supports means that we can simply provide mutual 
+exclusion on a shared better to swap work back and forth between the host system 
+and the GPU. We can then use this to create a simple client-server protocol 
+using this shared memory.
+
+This work treats the GPU as a client and the host as a server. The client 
+initiates a communication while the server listens for them. In order to 
+communicate between the host and the device, we simply maintain a buffer of 
+memory and two mailboxes. One mailbox is write-only while the other is 
+read-only. This exposes three primitive operations: using the buffer, giving 
+away ownership, and waiting for ownership. This is implemented as a half-duplex 
+transmission channel between the two sides. We decided to assign ownership of 
+the buffer to the client when the inbox and outbox bits are equal and to the 
+server when they are not.
+
+In order to make this transmission channel thread-safe, we abstract ownership of 
+the given mailbox pair and buffer around a port, effectively acting as a lock 
+and an index into the allocated buffer slice. The server and device have 
+independent locks around the given port. In this scheme, the buffer can be used 
+to communicate intent and data generically with the server. We them simply 
+provide multiple copies of this protocol and expose them as multiple ports.
+
+If this were simply a standard CPU system, this would be sufficient. However, 
+GPUs have my unique architectural challenges. First, GPU threads execute in 
+lock-step with each other in groups typically called warps or wavefronts. We 
+need to target the smallest unit of independent parallelism, so the RPC 
+interface needs to handle an entire group of threads at once. This is done by 
+increasing the size of the buffer and adding a thread mask argument so the 
+server knows which threads are active when it handles the communication. Second, 
+GPUs generally have no forward progress guarantees. In order to guarantee we do 
+not encounter deadlocks while executing it is required that the number of ports 
+matches the maximum amount of hardware parallelism on the device. It is also 
+very important that the thread mask remains consistent while interfacing with 
+the port.
+
+.. image:: ./rpc-diagram.svg
+   :width: 75%
+   :align: center
+
+The above diagram outlines the architecture of the RPC interface. For clarity 
+the following list will explain the operations done by the client and server 
+respectively when initiating a communication.
+
+First, a communication from the perspective of the client:
+
+* The client searches for an available port and claims the lock.
+* The client checks that the port is still available to the current device and 
+  continues if so.
+* The client writes its data to the fixed-size packet and toggles its outbox.
+* The client waits until its inbox matches its outbox.
+* The client reads the data from the fixed-size packet.
+* The client closes the port and continues executing.
+
+Now, the same communication from the perspective of the server:
+
+* The server searches for an available port with pending work and claims the 
+  lock.
+* The server checks that the port is still available to the current device.
+* The server reads the opcode to perform the expected operation, in this 
+  case a receive and then send.
+* The server reads the data from the fixed-size packet.
+* The server writes its data to the fixed-size packet and toggles its outbox.
+* The server closes the port and continues searching for ports that need to be 
+  serviced
+
+This architecture currently requires that the host periodically checks the RPC 
+server's buffer for ports with pending work. Note that a port can be closed 
+without waiting for its submitted work to be completed. This allows us to model 
+asynchronous operations that do not need to wait until the server has completed 
+them. If an operation requires more data than the fixed size buffer, we simply 
+send multiple packets back and forth in a streaming fashion.
+
+Server Library
+--------------
+
+The RPC server's basic functionality is provided by the LLVM C library. A static 
+library called ``libllvmlibc_rpc_server.a`` includes handling for the basic 
+operations, such as printing or exiting. This has a small API that handles 
+setting up the unified buffer and an interface to check the opcodes.
+
+Some operations are too divergent to provide generic implementations for, such 
+as allocating device accessible memory. For these cases, we provide a callback 
+registration scheme to add a custom handler for any given opcode through the 
+port API. More information can be found in the installed header 
+``<install>/include/gpu-none-llvm/rpc_server.h``.
+
+Client Example
+--------------
+
+The Client API is not currently exported by the LLVM C library. This is 
+primarily due to being written in C++ and relying on internal data structures. 
+It uses a simple send and receive interface with a fixed-size packet. The 
+following example uses the RPC interface to call a function pointer on the 
+server.
+
+This code first opens a port with the given opcode to facilitate the 
+communication. It then copies over the argument struct to the server using the 
+``send_n`` interface to stream arbitrary bytes. The next send operation provides 
+the server with the function pointer that will be executed. The final receive 
+operation is a no-op and simply forces the client to wait until the server is 
+done. It can be omitted if asynchronous execution is desired.
+
+.. code-block:: c++
+
+  void rpc_host_call(void *fn, void *data, size_t size) {
+    rpc::Client::Port port = rpc::client.open<RPC_HOST_CALL>();
+    port.send_n(data, size);
+    port.send([=](rpc::Buffer *buffer) {
+      buffer->data[0] = reinterpret_cast<uintptr_t>(fn);
+    });
+    port.recv([](rpc::Buffer *) {});
+    port.close();
+  }
+
+Server Example
+--------------
+
+This example shows the server-side handling of the previous client example. When 
+the server is checked, if there are any ports with pending work it will check 
+the opcode and perform the appropriate action. In this case, the action is to 
+call a function pointer provided by the client.
+
+In this example, the server simply runs forever in a separate thread for 
+brevity's sake. Because the client is a GPU potentially handling several threads 
+at once, the server needs to loop over all the active threads on the GPU. We 
+abstract this into the ``lane_size`` variable, which is simply the device's warp 
+or wavefront size. The identifier is simply the threads index into the current 
+warp or wavefront. We allocate memory to copy the struct data into, and then 
+call the given function pointer with that copied data. The final send simply 
+signals completion and uses the implicit thread mask to delete the temporary 
+data.
+
+.. code-block:: c++
+  
+  for(;;) {
+    auto port = server.try_open(index);
+    if (!port)
+      return continue;
+
+    switch(port->get_opcode()) {
+    case RPC_HOST_CALL: {
+      uint64_t sizes[LANE_SIZE];
+      void *args[LANE_SIZE];
+      port->recv_n(args, sizes, [&](uint64_t size) { return new char[size]; });
+      port->recv([&](rpc::Buffer *buffer, uint32_t id) {
+        reinterpret_cast<void (*)(void *)>(buffer->data[0])(args[id]);
+      });
+      port->send([&](rpc::Buffer *, uint32_t id) {
+        delete[] reinterpret_cast<uint8_t *>(args[id]);
+      });
+      break;
+    }
+    default:
+      port->recv([](rpc::Buffer *) {});
+      break;
+    }
+  }
+
+CUDA Server Example
+-------------------
+
+The following code shows an example of using the exported RPC interface along 
+with the C library to manually configure a working server using the CUDA 
+language. Other runtimes can use the presence of the ``__llvm_libc_rpc_client`` 
+in the GPU executable as an indicator for whether or not the server can be 
+checked. These details should ideally be handled by the GPU language runtime, 
+but the following example shows how it can be used by a standard user.
+
+.. code-block:: cuda
+
+  #include <cstdio>
+  #include <cstdlib>
+  #include <cuda_runtime.h>
+  
+  #include <gpu-none-llvm/rpc_server.h>
+  
+  [[noreturn]] void handle_error(cudaError_t err) {
+    fprintf(stderr, "CUDA error: %s\n", cudaGetErrorString(err));
+    exit(EXIT_FAILURE);
+  }
+  
+  [[noreturn]] void handle_error(rpc_status_t err) {
+    fprintf(stderr, "RPC error: %d\n", err);
+    exit(EXIT_FAILURE);
+  }
+  
+  // The handle to the RPC client provided by the C library.
+  extern "C" __device__ void *__llvm_libc_rpc_client;
+  
+  __global__ void get_client_ptr(void **ptr) { *ptr = __llvm_libc_rpc_client; }
+  
+  // Obtain the RPC client's handle from the device. The CUDA language cannot look
+  // up the symbol directly like the driver API, so we launch a kernel to read it.
+  void *get_rpc_client() {
+    void *rpc_client = nullptr;
+    void **rpc_client_d = nullptr;
+  
+    if (cudaError_t err = cudaMalloc(&rpc_client_d, sizeof(void *)))
+      handle_error(err);
+    get_client_ptr<<<1, 1>>>(rpc_client_d);
+    if (cudaError_t err = cudaDeviceSynchronize())
+      handle_error(err);
+    if (cudaError_t err = cudaMemcpy(&rpc_client, rpc_client_d, sizeof(void *),
+                                     cudaMemcpyDeviceToHost))
+      handle_error(err);
+    return rpc_client;
+  }
+  
+  // Routines to allocate mapped memory that both the host and the device can
+  // access asychonrously to communicate with eachother.
+  void *alloc_host(size_t size, void *) {
+    void *sharable_ptr;
+    if (cudaError_t err = cudaMallocHost(&sharable_ptr, sizeof(void *)))
+      handle_error(err);
+    return sharable_ptr;
+  };
+  
+  void free_host(void *ptr, void *) {
+    if (cudaError_t err = cudaFreeHost(ptr))
+      handle_error(err);
+  }
+  
+  // The device-side overload of the standard C function to call.
+  extern "C" __device__ int puts(const char *);
+  
+  // Calls the C library function from the GPU C library.
+  __global__ void hello() { puts("Hello world!"); }
+  
+  int main() {
+    int device = 0;
+    // Initialize the RPC server to run on a single device.
+    if (rpc_status_t err = rpc_init(/*num_device=*/1))
+      handle_error(err);
+  
+    // Initialize the RPC server to run on the given device.
+    if (rpc_status_t err =
+            rpc_server_init(device, RPC_MAXIMUM_PORT_COUNT,
+                            /*warp_size=*/32, alloc_host, /*data=*/nullptr))
+      handle_error(err);
+  
+    // Initialize the RPC client by copying the buffer to the device's handle.
+    void *rpc_client = get_rpc_client();
+    if (cudaError_t err =
+            cudaMemcpy(rpc_client, rpc_get_client_buffer(device),
+                       rpc_get_client_size(), cudaMemcpyHostToDevice))
+      handle_error(err);
+  
+    cudaStream_t stream;
+    if (cudaError_t err = cudaStreamCreate(&stream))
+      handle_error(err);
+  
+    // Execute the kernel.
+    hello<<<1, 1, 0, stream>>>();
+  
+    // While the kernel is executing, check the RPC server for work to do.
+    while (cudaStreamQuery(stream) == cudaErrorNotReady)
+      if (rpc_status_t err = rpc_handle_server(device))
+        handle_error(err);
+  
+    // Shut down the server running on the given device.
+    if (rpc_status_t err =
+            rpc_server_shutdown(device, free_host, /*data=*/nullptr))
+      handle_error(err);
+  
+    // Shut down the entire RPC server interface.
+    if (rpc_status_t err = rpc_shutdown())
+      handle_error(err);
+  
+    return EXIT_SUCCESS;
+  }
+
+The above code must be compiled in CUDA's relocatable device code mode and with 
+the advanced offloading driver to link in the library. Currently this can be 
+done with the following invocation. Using LTO avoids the overhead normally 
+associated with relocatable device code linking.
+
+.. code-block:: sh
+
+  $> clang++ -x cuda rpc.cpp --offload-arch=native -fgpu-rdc -lcudart -lcgpu \
+       -I<install-path>include -L<install-path>/lib -lllvmlibc_rpc_server \
+       -O3 -foffload-lto -o hello
+  $> ./hello
+  Hello world!
 
 Extensions
 ----------

diff  --git a/libc/docs/gpu/testing.rst b/libc/docs/gpu/testing.rst
index d0f162694562deb..f793e938e9806f0 100644
--- a/libc/docs/gpu/testing.rst
+++ b/libc/docs/gpu/testing.rst
@@ -18,9 +18,9 @@ Testing Infrastructure
 ======================
 
 The testing support in LLVM's libc implementation for GPUs is designed to mimic
-the standard unit tests as much as possible. We use the `remote procedure call
-<libc_gpu_rpc>`_ support to provide the necessary utilities like printing from
-the GPU. Execution is performed by emitting a ``_start`` kernel from the GPU
+the standard unit tests as much as possible. We use the :ref:`libc_gpu_rpc` 
+support to provide the necessary utilities like printing from the GPU. Execution 
+is performed by emitting a ``_start`` kernel from the GPU
 that is then called by an external loader utility. This is an example of how
 this can be done manually:
 


        


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