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Intermediate

GPU Training Setup and Measured Memory Budget

Validate the runtime, inventory resident memory and benchmark real precision and batch choices before committing to a GPU training configuration.

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Workflow

  1. Define the representative training workload

    Record the actual model architecture, input shapes or sequence lengths, batch semantics, optimizer and quality target. Identify one device’s resident tensors under any sharding or offload arrangement. Use matching layer formulas as checks against the framework’s unique parameter inventory, not as a universal model-size formula.

  2. Verify the software and device environment

    Use the framework’s current installation guidance for the actual hardware and driver, and record the working versions. Run a small forward, backward and optimizer step, then reload a saved checkpoint. Confirm numerical outputs and device placement before attempting the full workload.

  3. Build an explicit resident-memory ledger

    Record weight precision separately from gradient, optimizer and master-weight precision. Add representative retained activations, workspace, allocator overhead and other allocations without double counting, then set a process/device budget and reserve. Packed low-bit weight payload excludes metadata; the ledger must include additional runtime components explicitly.

  4. Measure full iterations and candidate batches

    Run representative warmup and complete training iterations, including backward and optimizer state creation. Record tensor-allocated, allocator-reserved and device/process readings with their meanings. Use the linear tensor-storage tool only for a fixed-shape planning scenario; dynamic shapes and workspaces require actual peak measurement.

  5. Compare precision and throughput deliberately

    Compare supported precision settings using the framework’s documented autocast and scaling behavior. Check loss, gradients, validation quality, memory and completed-sample throughput under the same workload. Synchronize GPU timing appropriately; mixed precision does not guarantee a fixed memory saving, speedup or stable behavior for every model.

  6. Save the validated operating configuration

    Retain the tested batch/shape range, precision, memory peaks, throughput interval, checkpoints and failure recovery notes. Rehearse restoring the run and record a smaller tested fallback configuration. Revalidate after model, optimizer, software or workload changes instead of treating unused memory as a universal percentage rule.

Tools Used

Checklist

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Define the representative training workload

Verify the software and device environment

Build an explicit resident-memory ledger

Measure full iterations and candidate batches

Compare precision and throughput deliberately

Save the validated operating configuration

Reference Materials

PyTorch CUDA memory and timingStandard

PyTorch distinguishes tensor allocation from allocator reservation and describes asynchronous GPU execution. Use compatible measurements without adding overlapping memory totals.

Automatic mixed precisionStandard

PyTorch documents operation-specific autocast and gradient scaling behavior. Actual model compatibility and numerical quality need testing.

GPU configuration recordTable

Keep the following evidence with the actual version used for this task.

RecordIncludeCheck
WorkloadArchitecture, shapes, batch and optimizerRun complete representative iterations
MemoryAllocated, reserved, process reading and reserveKeep definitions and measurement time
ComparisonPrecision, quality, throughput and restore testCompare the same completed work
  • Include the first optimizer step

    Some training state is created lazily and will not appear in a forward-only memory test.

  • Separate storage and runtime

    A small checkpoint can still require large activations, temporary workspaces or higher-precision training state.