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[CB] Sum GPU memory across devices for multi-GPU KV cache validation #3496

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[CB] Sum GPU memory across devices for multi-GPU KV cache validation #3496

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10 changes: 9 additions & 1 deletion src/cpp/src/continuous_batching/pipeline_impl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -164,7 +164,15 @@ void ContinuousBatchingPipeline::ContinuousBatchingImpl::initialize_pipeline(
// Scheduler configuration
SchedulerConfig normalized_config = scheduler_config;
size_t total_mem_size;
if (execution_device.find("GPU") != std::string::npos) {
if (all_gpu_device && execution_devices.size() > 1) {
// For multi-GPU setups (e.g. HETERO:GPU.0,GPU.1), sum available
// memory across all GPU execution devices so that cache_size can
// utilise the combined VRAM instead of being capped by a single GPU.
total_mem_size = 0;
for (const auto& dev : execution_devices) {
total_mem_size += utils::get_available_gpu_memory(dev, m_num_decoder_layers);
}
} else if (execution_device.find("GPU") != std::string::npos) {
total_mem_size = utils::get_available_gpu_memory(execution_device, m_num_decoder_layers);
} else {
total_mem_size = get_available_cpu_memory();
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