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reproducer_IPC_bandwidth.cpp
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reproducer_IPC_bandwidth.cpp
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#include <vector>
#include <iostream>
#include <stdint.h>
#include <mpi.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <CL/sycl.hpp>
#include <CL/sycl/usm.hpp>
#include <level_zero/ze_api.h>
#include <CL/sycl/backend/level_zero.hpp>
#include <sys/time.h>
inline double usecond(void) {
struct timeval tv;
gettimeofday(&tv,NULL);
return 1.0*tv.tv_usec + 1.0e6*tv.tv_sec;
}
#define GRID_SYCL_LEVEL_ZERO_IPC
cl::sycl::queue *theGridAccelerator;
cl::sycl::queue *tmpGridAccelerator;
uint32_t acceleratorThreads(void);
void acceleratorThreads(uint32_t);
void acceleratorInit(void);
#define accelerator
#define accelerator_inline strong_inline
#define accelerator_for2dNB( iter1, num1, iter2, num2, nsimd, ... ) \
theGridAccelerator->submit([&](cl::sycl::handler &cgh) { \
unsigned long nt=acceleratorThreads(); \
unsigned long unum1 = num1; \
unsigned long unum2 = num2; \
if(nt < 8)nt=8; \
cl::sycl::range<3> local {nt,1,nsimd}; \
cl::sycl::range<3> global{unum1,unum2,nsimd}; \
cgh.parallel_for( \
cl::sycl::nd_range<3>(global,local), \
[=] (cl::sycl::nd_item<3> item) /*mutable*/ \
[[intel::reqd_sub_group_size(8)]] \
{ \
auto iter1 = item.get_global_id(0); \
auto iter2 = item.get_global_id(1); \
auto lane = item.get_global_id(2); \
{ __VA_ARGS__ }; \
}); \
});
#define accelerator_barrier(dummy) theGridAccelerator->wait();
#define accelerator_forNB( iter1, num1, nsimd, ... ) accelerator_for2dNB( iter1, num1, iter2, 1, nsimd, {__VA_ARGS__} );
#define accelerator_for( iter, num, nsimd, ... ) \
accelerator_forNB(iter, num, nsimd, { __VA_ARGS__ } ); \
accelerator_barrier(dummy);
#define accelerator_for2d(iter1, num1, iter2, num2, nsimd, ... ) \
accelerator_for2dNB(iter1, num1, iter2, num2, nsimd, { __VA_ARGS__ } ); \
accelerator_barrier(dummy);
inline void *acceleratorAllocShared(size_t bytes){ return malloc_shared(bytes,*theGridAccelerator);};
inline void *acceleratorAllocDevice(size_t bytes){ return malloc_device(bytes,*theGridAccelerator);};
inline void acceleratorFreeShared(void *ptr){free(ptr,*theGridAccelerator);};
inline void acceleratorFreeDevice(void *ptr){free(ptr,*theGridAccelerator);};
inline void acceleratorCopyDeviceToDevice(void *from,void *to,size_t bytes) { theGridAccelerator->memcpy(to,from,bytes); theGridAccelerator->wait();}
inline void acceleratorCopyToDevice(void *from,void *to,size_t bytes) { theGridAccelerator->memcpy(to,from,bytes); theGridAccelerator->wait();}
inline void acceleratorCopyFromDevice(void *from,void *to,size_t bytes){ theGridAccelerator->memcpy(to,from,bytes); theGridAccelerator->wait();}
inline void acceleratorMemSet(void *base,int value,size_t bytes) { theGridAccelerator->memset(base,value,bytes); theGridAccelerator->wait();}
int acceleratorAbortOnGpuError=1;
uint32_t accelerator_threads=2;
uint32_t acceleratorThreads(void) {return accelerator_threads;};
void acceleratorThreads(uint32_t t) {accelerator_threads = t;};
void acceleratorInit(void)
{
int nDevices = 1;
cl::sycl::gpu_selector selector;
cl::sycl::device selectedDevice { selector };
theGridAccelerator = new sycl::queue (selectedDevice);
#ifdef GRID_SYCL_LEVEL_ZERO_IPC
zeInit(0);
#endif
char * localRankStr = NULL;
int rank = 0, world_rank=0;
#define ENV_LOCAL_RANK_OMPI "OMPI_COMM_WORLD_LOCAL_RANK"
#define ENV_LOCAL_RANK_MVAPICH "MV2_COMM_WORLD_LOCAL_RANK"
#define ENV_RANK_OMPI "OMPI_COMM_WORLD_RANK"
#define ENV_RANK_MVAPICH "MV2_COMM_WORLD_RANK"
// We extract the local rank initialization using an environment variable
if ((localRankStr = getenv(ENV_LOCAL_RANK_OMPI)) != NULL)
{
rank = atoi(localRankStr);
}
if ((localRankStr = getenv(ENV_LOCAL_RANK_MVAPICH)) != NULL)
{
rank = atoi(localRankStr);
}
if ((localRankStr = getenv(ENV_RANK_OMPI )) != NULL) { world_rank = atoi(localRankStr);}
if ((localRankStr = getenv(ENV_RANK_MVAPICH)) != NULL) { world_rank = atoi(localRankStr);}
auto devices = cl::sycl::device::get_devices();
for(int d = 0;d<devices.size();d++){
#define GPU_PROP_STR(prop) \
printf("AcceleratorSyclInit: " #prop ": %s \n",devices[d].get_info<cl::sycl::info::device::prop>().c_str());
#define GPU_PROP_FMT(prop,FMT) \
printf("AcceleratorSyclInit: " #prop ": " FMT" \n",devices[d].get_info<cl::sycl::info::device::prop>());
#define GPU_PROP(prop) GPU_PROP_FMT(prop,"%ld");
GPU_PROP_STR(vendor);
GPU_PROP_STR(version);
GPU_PROP(global_mem_size);
}
if ( world_rank == 0 ) {
auto name = theGridAccelerator->get_device().get_info<sycl::info::device::name>();
printf("AcceleratorSyclInit: Selected device is %s\n",name.c_str());
printf("AcceleratorSyclInit: ================================================\n");
}
}
void sharedMemoryInit(MPI_Comm comm);
void sharedMemoryAllocate(size_t bytes);
void sharedMemoryTest(size_t bytes);
MPI_Comm communicator_world;
void mpiInit(int *argc,char ***argv)
{
int flag;
int provided;
MPI_Init_thread(argc,argv,MPI_THREAD_MULTIPLE,&provided);
// Never clean up as done once.
MPI_Comm_dup (MPI_COMM_WORLD,&communicator_world);
sharedMemoryInit(communicator_world);
sharedMemoryAllocate(1024L*1024L*1024L);
}
std::vector<void *> WorldShmCommBufs;
MPI_Comm WorldComm;
int WorldRank;
int WorldSize;
MPI_Comm WorldShmComm;
int WorldShmRank;
int WorldShmSize;
int WorldNodes;
int WorldNode;
std::vector<int> WorldShmRanks;
void sharedMemoryInit(MPI_Comm comm)
{
#define header "SharedMemoryMpi: "
WorldComm = comm;
MPI_Comm_rank(WorldComm,&WorldRank);
MPI_Comm_size(WorldComm,&WorldSize);
// WorldComm, WorldSize, WorldRank
/////////////////////////////////////////////////////////////////////
// Split into groups that can share memory
/////////////////////////////////////////////////////////////////////
MPI_Comm_split_type(comm, MPI_COMM_TYPE_SHARED, 0, MPI_INFO_NULL,&WorldShmComm);
MPI_Comm_rank(WorldShmComm ,&WorldShmRank);
MPI_Comm_size(WorldShmComm ,&WorldShmSize);
if ( WorldRank == 0) {
std::cout << header " World communicator of size " <<WorldSize << std::endl;
std::cout << header " Node communicator of size " <<WorldShmSize << std::endl;
}
// WorldShmComm, WorldShmSize, WorldShmRank
// WorldNodes
WorldNodes = WorldSize/WorldShmSize;
assert( (WorldNodes * WorldShmSize) == WorldSize );
/////////////////////////////////////////////////////////////////////
// find world ranks in our SHM group (i.e. which ranks are on our node)
/////////////////////////////////////////////////////////////////////
MPI_Group WorldGroup, ShmGroup;
MPI_Comm_group (WorldComm, &WorldGroup);
MPI_Comm_group (WorldShmComm, &ShmGroup);
std::vector<int> world_ranks(WorldSize); for(int r=0;r<WorldSize;r++) world_ranks[r]=r;
WorldShmRanks.resize(WorldSize);
MPI_Group_translate_ranks (WorldGroup,WorldSize,&world_ranks[0],ShmGroup, &WorldShmRanks[0]);
///////////////////////////////////////////////////////////////////
// Identify who is in my group and nominate the leader
///////////////////////////////////////////////////////////////////
int g=0;
std::vector<int> MyGroup;
MyGroup.resize(WorldShmSize);
for(int rank=0;rank<WorldSize;rank++){
if(WorldShmRanks[rank]!=MPI_UNDEFINED){
assert(g<WorldShmSize);
MyGroup[g++] = rank;
}
}
std::sort(MyGroup.begin(),MyGroup.end(),std::less<int>());
int myleader = MyGroup[0];
std::vector<int> leaders_1hot(WorldSize,0);
std::vector<int> leaders_group(WorldNodes,0);
leaders_1hot [ myleader ] = 1;
///////////////////////////////////////////////////////////////////
// global sum leaders over comm world
///////////////////////////////////////////////////////////////////
int ierr=MPI_Allreduce(MPI_IN_PLACE,&leaders_1hot[0],WorldSize,MPI_INT,MPI_SUM,WorldComm);
assert(ierr==0);
///////////////////////////////////////////////////////////////////
// find the group leaders world rank
///////////////////////////////////////////////////////////////////
int group=0;
for(int l=0;l<WorldSize;l++){
if(leaders_1hot[l]){
leaders_group[group++] = l;
}
}
///////////////////////////////////////////////////////////////////
// Identify the node of the group in which I (and my leader) live
///////////////////////////////////////////////////////////////////
WorldNode=-1;
for(int g=0;g<WorldNodes;g++){
if (myleader == leaders_group[g]){
WorldNode=g;
}
}
}
void sharedMemoryAllocate(size_t bytes)
{
void * ShmCommBuf ;
//////////////////////////////////////////////////////////////////////////////////////////////////////////
// allocate the pointer array for shared windows for our group
//////////////////////////////////////////////////////////////////////////////////////////////////////////
MPI_Barrier(WorldShmComm);
WorldShmCommBufs.resize(WorldShmSize);
///////////////////////////////////////////////////////////////////////////////////////////////////////////
// Each MPI rank should allocate our own buffer
///////////////////////////////////////////////////////////////////////////////////////////////////////////
ShmCommBuf = acceleratorAllocDevice(bytes);
if (ShmCommBuf == (void *)NULL ) {
std::cerr << " SharedMemoryMPI.cc acceleratorAllocDevice failed NULL pointer for " << bytes<<" bytes " << std::endl;
exit(EXIT_FAILURE);
}
// if ( WorldRank == 0 ){
if ( 1 ){
std::cout << WorldRank << header " SharedMemoryMPI.cc acceleratorAllocDevice "<< bytes
<< "bytes at "<< std::hex<< ShmCommBuf <<std::dec<<" for comms buffers " <<std::endl;
}
char value='a';
theGridAccelerator->fill((void *)ShmCommBuf, value, bytes).wait();
std::cout<< "Setting up IPC"<<std::endl;
///////////////////////////////////////////////////////////////////////////////////////////////////////////
// Loop over ranks/gpu's on our node
///////////////////////////////////////////////////////////////////////////////////////////////////////////
for(int r=0;r<WorldShmSize;r++){
#ifdef GRID_SYCL_LEVEL_ZERO_IPC
auto zeDevice = cl::sycl::get_native<cl::sycl::backend::level_zero>(theGridAccelerator->get_device());
auto zeContext = cl::sycl::get_native<cl::sycl::backend::level_zero>(theGridAccelerator->get_context());
//////////////////////////////////////////////////
// If it is me, pass around the IPC access key
//////////////////////////////////////////////////
typedef struct { int fd; pid_t pid ; } clone_mem_t;
ze_ipc_mem_handle_t handle;
clone_mem_t what_intel_should_have_done;
std::cout << " sizeof(ze_ipc_mem_handle_t) is " <<sizeof(ze_ipc_mem_handle_t)<<std::endl;
if ( r==WorldShmRank ) {
auto err = zeMemGetIpcHandle(zeContext,ShmCommBuf,&handle);
if ( err != ZE_RESULT_SUCCESS ) {
std::cout << "SharedMemoryMPI.cc zeMemGetIpcHandle failed for rank "<<r<<" "<<std::hex<<err<<std::dec<<std::endl;
exit(EXIT_FAILURE);
} else {
std::cout << "SharedMemoryMPI.cc zeMemGetIpcHandle succeeded for rank "<<r<<" "<<std::hex<<err<<std::dec<<std::endl;
}
memcpy((void *)&what_intel_should_have_done.fd,(void *)&handle,sizeof(int));
what_intel_should_have_done.pid = getpid();
std::cout<<"Allocated Ipc filedes pid is {"<< what_intel_should_have_done.fd <<","
<< what_intel_should_have_done.pid<<"}\n";
std::cout<<"Allocated IpcHandle rank size "<< sizeof(handle) << " rank "<<r<<" (hex) ";
for(int c=0;c<ZE_MAX_IPC_HANDLE_SIZE;c++){
std::cout<<std::hex<<(uint32_t)((uint8_t)handle.data[c])<<std::dec;
}
std::cout<<std::endl;
}
//////////////////////////////////////////////////
// Share this IPC handle across the Shm Comm
//////////////////////////////////////////////////
{
int ierr=MPI_Bcast(&what_intel_should_have_done,
sizeof(what_intel_should_have_done),
MPI_BYTE,
r,
WorldShmComm);
assert(ierr==0);
}
///////////////////////////////////////////////////////////////
// If I am not the source, overwrite thisBuf with remote buffer
///////////////////////////////////////////////////////////////
void * thisBuf = ShmCommBuf;
if ( r!=WorldShmRank ) {
thisBuf = nullptr;
std::cout<<"mapping seeking remote pid/fd "
<<what_intel_should_have_done.pid<<"/"
<<what_intel_should_have_done.fd<<std::endl;
int pidfd = syscall(SYS_pidfd_open,what_intel_should_have_done.pid,0);
std::cout<<"Using IpcHandle pidfd "<<pidfd<<"\n";
// int myfd = syscall(SYS_pidfd_getfd,pidfd,what_intel_should_have_done.fd,0);
int myfd = syscall(438,pidfd,what_intel_should_have_done.fd,0);
std::cout<<"Using IpcHandle myfd "<<myfd<<"\n";
memcpy((void *)&handle,(void *)&myfd,sizeof(int));
std::cout<<"Using IpcHandle rank "<<r<<" ";
for(int c=0;c<ZE_MAX_IPC_HANDLE_SIZE;c++){
std::cout<<std::hex<<(uint32_t)((uint8_t)handle.data[c])<<std::dec;
}
std::cout<<std::endl;
auto err = zeMemOpenIpcHandle(zeContext,zeDevice,handle,0,&thisBuf);
if ( err != ZE_RESULT_SUCCESS ) {
std::cout << "SharedMemoryMPI.cc "<<zeContext<<" "<<zeDevice<<std::endl;
std::cout << "SharedMemoryMPI.cc zeMemOpenIpcHandle failed for rank "<<r<<" "<<std::hex<<err<<std::dec<<std::endl;
exit(EXIT_FAILURE);
} else {
std::cout << "SharedMemoryMPI.cc zeMemOpenIpcHandle succeeded for rank "<<r<<std::endl;
std::cout << "SharedMemoryMPI.cc zeMemOpenIpcHandle pointer is "<<std::hex<<thisBuf<<std::dec<<std::endl;
}
assert(thisBuf!=nullptr);
}
///////////////////////////////////////////////////////////////
// Save a copy of the device buffers
///////////////////////////////////////////////////////////////
WorldShmCommBufs[r] = thisBuf;
#else
WorldShmCommBufs[r] = ShmCommBuf;
#endif
}
}
#undef header
void sharedMemoryTest(size_t bytes)
{
double elapsed;
double fill;
if ( WorldRank==0){
std::cout << "SharedMemoryTest for "<<bytes<<"bytes"<<std::endl;
for(int r=0;r<WorldShmSize;r++){
uint64_t word = (0x5A5AUL<<32) | r;
uint64_t words = bytes/sizeof(uint64_t);
uint64_t *from = (uint64_t *)WorldShmCommBufs[r];
uint64_t *to = (uint64_t *)WorldShmCommBufs[0];
fill=-usecond();
accelerator_for(w,words,1,{
from[w] = word;
});
fill+=usecond();
elapsed=-usecond();
accelerator_for(w,words,1,{
to[w]=from[w];
});
elapsed+=usecond();
std::cout << "Get from device "<<r<<" to device 0 " << " transfer "<<bytes <<" bytes in " <<elapsed <<" us\n";
std::cout << "Get from device "<<r<<" to device 0 " << " rate "<< bytes/elapsed<< " MB/s\n";
std::cout << "Device "<<r<<" from device 0 " << " fill "<< bytes/fill<< " MB/s\n";
to = (uint64_t *)WorldShmCommBufs[r];
from = (uint64_t *)WorldShmCommBufs[0];
fill=-usecond();
accelerator_for(w,words,1,{
from[w] = word;
});
fill+=usecond();
elapsed=-usecond();
accelerator_for(w,words,1,{
to[w]=from[w];
});
elapsed+=usecond();
std::cout << "Put to device "<<r<<" from device 0 " << " transfer "<<bytes <<" bytes in " <<elapsed <<" us\n";
std::cout << "Put to device "<<r<<" from device 0 " << " rate "<< bytes/elapsed<< " MB/s\n";
std::cout << "Device 0 from device 0 " << " fill "<< bytes/fill<< " MB/s\n";
}
}
MPI_Barrier(MPI_COMM_WORLD);
}
int main(int argc,char **argv)
{
acceleratorInit();
mpiInit(&argc,&argv);
sharedMemoryTest(1024*1024);
sharedMemoryTest(1024*1024*2);
sharedMemoryTest(1024*1024*4);
sharedMemoryTest(1024*1024*8);
sharedMemoryTest(1024*1024*16);
sharedMemoryTest(1024*1024*32);
sharedMemoryTest(1024*1024*32);
sharedMemoryTest(1024*1024*64);
sharedMemoryTest(1024*1024*128);
sharedMemoryTest(1024*1024*256);
sharedMemoryTest(1024*1024*512);
}