Add PyTorch profiler example

Author: mvsjober

mnist_ddp_profiler.py

@@ -0,0 +1,120 @@
+# Based on multiprocessing example from
+# https://yangkky.github.io/2019/07/08/distributed-pytorch-tutorial.html
+
+from datetime import datetime
+import argparse
+import os
+import torch
+import torch.nn as nn
+import torch.distributed as dist
+import torchvision.transforms as transforms
+from torchvision.datasets import MNIST
+from torch.utils.data.distributed import DistributedSampler
+from torch.nn.parallel import DistributedDataParallel
+from torch.utils.data import DataLoader
+from torch.profiler import profile, record_function, ProfilerActivity
+
+
+class ConvNet(nn.Module):
+    def __init__(self, num_classes=10):
+        super(ConvNet, self).__init__()
+        self.layer1 = nn.Sequential(
+            nn.Conv2d(1, 16, kernel_size=5, stride=1, padding=2),
+            nn.BatchNorm2d(16),
+            nn.ReLU(),
+            nn.MaxPool2d(kernel_size=2, stride=2))
+        self.layer2 = nn.Sequential(
+            nn.Conv2d(16, 32, kernel_size=5, stride=1, padding=2),
+            nn.BatchNorm2d(32),
+            nn.ReLU(),
+            nn.MaxPool2d(kernel_size=2, stride=2))
+        self.fc = nn.Linear(7*7*32, num_classes)
+
+    def forward(self, x):
+        out = self.layer1(x)
+        out = self.layer2(out)
+        out = out.reshape(out.size(0), -1)
+        out = self.fc(out)
+        return out
+
+
+def train(num_epochs):
+    dist.init_process_group(backend='nccl')
+
+    torch.manual_seed(0)
+    local_rank = int(os.environ['LOCAL_RANK'])
+    torch.cuda.set_device(local_rank)
+
+    verbose = dist.get_rank() == 0  # print only on global_rank==0
+
+    prof = profile(
+        schedule=torch.profiler.schedule(
+            skip_first=10,
+            wait=5,
+            warmup=1,
+            active=3, 
+            repeat=1)
+        on_trace_ready=torch.profiler.tensorboard_trace_handler('./logs/profiler'),
+        activities=[ProfilerActivity.CPU, ProfilerActivity.CUDA],
+        record_shapes=True,   # record shapes of operator inputs
+        profile_memory=True,  # track tensor memory allocation/deallocation
+        with_stack=True,      # record source code information
+        with_flops=True,      # estimate FLOPS of operators
+    )
+
+    model = ConvNet().cuda()
+    batch_size = 100
+
+    criterion = nn.CrossEntropyLoss().cuda()
+    optimizer = torch.optim.SGD(model.parameters(), 1e-4)
+
+    model = DistributedDataParallel(model, device_ids=[local_rank])
+
+    train_dataset = MNIST(root='./data', train=True,
+                          transform=transforms.ToTensor(), download=True)
+    train_sampler = DistributedSampler(train_dataset)
+    train_loader = DataLoader(dataset=train_dataset, batch_size=batch_size,
+                              shuffle=False, num_workers=0, pin_memory=True,
+                              sampler=train_sampler)
+
+    start = datetime.now()
+    prof.start()
+    for epoch in range(num_epochs):
+        tot_loss = 0
+        for i, (images, labels) in enumerate(train_loader):
+            images = images.cuda(non_blocking=True)
+            labels = labels.cuda(non_blocking=True)
+
+            outputs = model(images)
+            loss = criterion(outputs, labels)
+
+            optimizer.zero_grad()
+            loss.backward()
+            optimizer.step()
+            
+            prof.step()
+            
+            tot_loss += loss.item()
+
+        if verbose:
+            print('Epoch [{}/{}], average loss: {:.4f}'.format(
+                epoch + 1,
+                num_epochs,
+                tot_loss / (i+1)))
+    prof.stop()
+    
+    if verbose:
+        print("Training completed in: " + str(datetime.now() - start))
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--epochs', default=2, type=int, metavar='N',
+                        help='number of total epochs to run')
+    args = parser.parse_args()
+
+    train(args.epochs)
+
+
+if __name__ == '__main__':
+    main()

run-ddp-gpu1-profiler.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+#SBATCH --account=project_2001659
+#SBATCH --partition=gputest
+#SBATCH --ntasks=1
+#SBATCH --cpus-per-task=10
+#SBATCH --mem=64G
+#SBATCH --time=15
+#SBATCH --gres=gpu:v100:1
+
+module purge
+module load pytorch
+
+# Old way with torch.distributed.run
+# srun python3 -m torch.distributed.run --standalone --nnodes=1 --nproc_per_node=4 mnist_ddp.py --epochs=100
+
+# New way with torchrun
+srun torchrun --standalone --nnodes=1 --nproc_per_node=1 mnist_ddp_profiler.py --epochs=100