Memory Usage Comparison
This document is used to summarize the memory consumption when running common examples on different chips.
Comparison of Remaining Memory Size for Common Examples
Please note that the following test results have not undergone any memory optimization, they are simply the results obtained after directly running the basic examples in ESP-IDF. If you want to see the results after memory optimization, you can refer to next part, Example: Comparison of remaining memory size before and after memory optimization for ESP32-C3.
chip |
Empty project |
Station |
Gatt_server |
bleprph |
provision(ble & Wi-Fi coexis) |
thread |
|---|---|---|---|---|---|---|
ESP32 |
366 K |
230 K |
205 K |
201 K |
140 K |
not support |
ESP32-C3 |
332 K |
219 K |
215 K |
205 K |
126 K |
not support |
ESP32-C3(ECO7) |
332 K |
230 K |
225 K |
214 K |
136 K |
not support |
ESP32-C2 |
197 K |
100 K |
80 K |
98 K |
26 K |
not support |
ESP32-S3 |
392 K |
273 K |
276 K |
267 K |
189 K |
not support |
ESP32-C6 |
474 K |
321 K |
358 K |
370 K |
259 K |
364 K |
ESP32-H2 |
269 K |
not support |
150 K |
166 K |
not support |
166 K |
ESP32-C5 |
347 K |
220 K |
225 K |
231 K |
192 K |
231 K |
ESP32-P4 |
608 K |
not support |
not support |
not support |
not support |
not support |
ESP32-C61 |
265 K |
136 K |
150 K |
159 K |
80 K |
not support |
ESP32-S31 |
478 K |
360 K |
364 K |
364 K |
271 K |
366 K |
Note
For further optimization of memory usage, please refer to ESP Memory Usage Optimization.
Note
ESP32-S31 was tested on master (commit 3a34711eacc41585481ba0e694dacb8d2d84e091), using the default sdkconfig configuration for each example.
Other chips have been tested in the release/v5.5 (commit 2e7a9174fcdc18f4c242aba5d9ff90644ea03cd2) version, using the default sdkconfig configuration for each example.
Note
In the ESP32-C3(ECO7), wireless applications have more available RAM, with Wi-Fi related increasing by 10 KB, BLE increasing by 15 KB, and coexistence mode increasing by 20 KB. To use ESP32-C3 (ECO7), please enable the following configurations in menuconfig: - Component config > Hardware Settings > Chip revision > Minimum Supported ESP32-C3 Revision > Rev 1.1 - Component config > SPI Flash driver > Use esp_flash implementation in ROM
Example: Comparison of remaining memory size before and after memory optimization for ESP32-C3
example |
Before memory optimization |
After memory optimization |
|---|---|---|
Physical memory |
400 K |
400 K |
Station |
230 K |
304 K |
Station + 1TLS(MQTTS) |
210 K |
300 K |
bleprph_wifi_coex |
178 K |
248 K |
Note
ESP32-C3 data tested in ESP-IDF v5.2.2
Print the station’s free heap memory after the got ip event
Station + 1TLS(MQTTS) data is based on the ESP-IDF mqtt/ssl example, print the free heap memory after the MQTT_EVENT_DATA event
In the ESP-IDF bleprph_wifi_coex example test, nimble BLE broadcast starts after the got ip event, then print the free heap memory