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Per-entry seed in XNNPACK weights cache for XNNPACK-upgrade invalidation #20170

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Per-entry seed in XNNPACK weights cache for XNNPACK-upgrade invalidation #20170

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d439c39
Cross-load packed weight cache reuse for XNNPACK
doggeral Jun 9, 2026
7739ca2
Per-entry seed in XNNPACK weights cache for XNNPACK-upgrade invalidation
doggeral Jun 9, 2026
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12 changes: 9 additions & 3 deletions backends/xnnpack/runtime/XNNPACKBackend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -100,9 +100,7 @@ class XnnpackBackend final
lock_weights_cache.lock();

const auto& cache_path = options_.get_packed_cache_path();
if (!cache_path.empty()) {
weights_cache_->set_packed_cache_path(cache_path);
}
weights_cache_->set_packed_cache_path(cache_path);

weights_cache_->initialize_for_runtime(
context.get_runtime_allocator(), named_data_map);
Expand Down Expand Up @@ -219,6 +217,14 @@ class XnnpackBackend final
BackendOptionContext& context,
const Span<BackendOption>& backend_options) override {
for (const auto& option : backend_options) {
if (strcmp(option.key, xnnpack::save_packed_index_option_key) == 0) {
auto* val = std::get_if<bool>(&option.value);
if (val && *val) {
const std::lock_guard<std::mutex> lock(weights_cache_mutex_);
return weights_cache_->save_packed_index();
}
continue;
}
Error err = options_.set_option(option);
if (err != Error::Ok) {
return err;
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3 changes: 3 additions & 0 deletions backends/xnnpack/runtime/XNNPACKBackend.h
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Expand Up @@ -20,6 +20,9 @@ const char weight_cache_option_key[] = "weight_cache_enabled";
// @lint-ignore CLANGTIDY facebook-hte-CArray
const char packed_cache_path_option_key[] = "packed_cache_path";

/// Trigger saving the packed weight index for cross-load cache reuse.
const char save_packed_index_option_key[] = "save_packed_index";

/// Workspace sharing mode. This is a backend option that can be set via the
/// set_option API to control memory sharing between CALL_DELEGATE instances.
/// This is useful for reducing memory consumption.
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