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Optimize API component memory usage by reordering class members to reduce padding (#9111)

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This commit is contained in:
J. Nick Koston
2025-06-19 03:08:25 +02:00
committed by GitHub
parent 43c677ef37
commit eeb0710ad4
4 changed files with 125 additions and 97 deletions
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16
esphome/components/api/api_server.h
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@@ -142,19 +142,27 @@ class APIServer : public Component, public Controller {
}
protected:
bool shutting_down_ = false;
// Pointers and pointer-like types first (4 bytes each)
std::unique_ptr<socket::Socket> socket_ = nullptr;
uint16_t port_{6053};
Trigger<std::string, std::string> *client_connected_trigger_ = new Trigger<std::string, std::string>();
Trigger<std::string, std::string> *client_disconnected_trigger_ = new Trigger<std::string, std::string>();
// 4-byte aligned types
uint32_t reboot_timeout_{300000};
uint32_t batch_delay_{100};
uint32_t last_connected_{0};
// Vectors and strings (12 bytes each on 32-bit)
std::vector<std::unique_ptr<APIConnection>> clients_;
std::string password_;
std::vector<uint8_t> shared_write_buffer_; // Shared proto write buffer for all connections
std::vector<HomeAssistantStateSubscription> state_subs_;
std::vector<UserServiceDescriptor *> user_services_;
Trigger<std::string, std::string> *client_connected_trigger_ = new Trigger<std::string, std::string>();
Trigger<std::string, std::string> *client_disconnected_trigger_ = new Trigger<std::string, std::string>();
// Group smaller types together
uint16_t port_{6053};
bool shutting_down_ = false;
// 3 bytes used, 1 byte padding
#ifdef USE_API_NOISE
std::shared_ptr<APINoiseContext> noise_ctx_ = std::make_shared<APINoiseContext>();