Heap Memory - Performance monitoring for the last 5 hours #825
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Have you watched it over several days? I ask, as I’ve seen this over a few hours at startup historically, but it generally stabilizes after a bit. I always attributed it to people walking past with BLE devices that scans pick up. |
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Hello @thorrak many thanks for your contribution. I have not but I will, It will run for the next hours and results will be posted here. I just have not understood your last sentence "I always attributed it to people walking past with BLE devices that scans pick up.". By the way, it make senses what you have said about stabilization, I see it more stable in these few hours around 200-199KB memory heap. |
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Hello again, 23 hours since the first gateway (esp32) startup: (From previous report) (The performance now is) 2024-12-28 09:40:21 --> ---- Heap Statistics ---- 2024-12-28 10:06:08 am --> ---- Heap Statistics ---- Any concern ? Will it leak memory over time ? I am concerned that esp will restart with lack of memory available after days. |
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Although it's certainly possible that there is a memory leak somewhere, that memory usage change doesn't make it sound like it's in the bluetooth stack (to me). Keep in mind that you are constantly creating/destroying devices in memory as your controller scans, so this would have to be an edge case. My recommendation would still be to let it run longer and see what happens. Eventually your device is going to lose power/get disconnected/restart, so what is the minimum acceptable run-time between restarts that you can tolerate? Test that long, and see if you have any issues. |
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Some more logs from the last couple of minutes: 2024-12-28 10:36:37 --> ---- Heap Statistics ---- |
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This is all completely normal, there a lot of allocations that occur in the normal operation of the BLE stack and is eventually cleaned up by the RTOS during the Idle task. |
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Hello, first of all I would like to share that I am really happy with this library, its is awesome to handle BLE connections with stable performance. I was at the beggining strugglinh with arduino standard BLE library but failing all the time due to the memory leake. Now, things are much better. I can handle 4 BLE connections at time with no issues.
I do have a gateway (esp32 wroom32e) scanning 4 bluetooth devices sensors (servers, esp32 c3), servers advertises for 4 seconds and transmit data to gateway every 25 seconds. Code is pretty much the same presented for nimBLE Client.ino.
I have run a test and I have plotted the serial monitor every scan time, in addition to that adding memory information such as esp_get_free_heap_size() and esp_get_minimum_free_heap_size().
Below it is possible to see memory heap for the last 5 hours. Although heap memory variation is small and it cleary shows (when ploggin every second) a memory recovery when disconnecting and reconnecting devices, I still see it decreasing a litle bit over the hours. Is there any reason to concern about memory leake under this current scenario ? In case i run my device with this below´s performance, will it run out of memory over the weeks or months ?
2024-12-27 10:00 am --> ---- Heap Statistics ----
2024-12-27 10:00 am --> Free Heap: 206068 bytes bytes
2024-12-27 10:00 am --> Minimum Free Heap: 205656 bytes bytes
2024-12-27 1:00 pm --> ---- Heap Statistics ----
2024-12-27 1:00 pm --> Free Heap: 200016 bytes
2024-12-27 1:00 pm --> Minimum Free Heap: 199120 bytes
2024-12-27 2:00 pm --> Free Heap: 199776 bytes
2024-12-27 2:00 pm --> Minimum Free Heap: 199084 bytes
2024-12-27 2:00 pm --> -------------------------
2024-12-27 3:00 pm --> ---- Heap Statistics ----
2024-12-27 3:00 pm --> Free Heap: 200140
2024-12-27 3:00 pm --> Minimum Free Heap: 199084 bytes
2024-12-27 3:00 pm --> ------------------------
2024-12-27 4:00 pm --> ---- Heap Statistics ----
2024-12-27 4:00 pm--> Free Heap: 199672 bytes
2024-12-27 4:00 pm--> Minimum Free Heap: 199084 bytes
2024-12-27 4:00 pm --> -------------------------
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