University of Twente Student Theses
The effect of writing and transmitting SD card data on the consistency of SD card write performance
Kräwinkel, R.W. (2020) The effect of writing and transmitting SD card data on the consistency of SD card write performance.
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| Abstract: | In this paper, we study the effect of writing data to an SD card over SPI and transmitting that wirelessly on the consistency in write performance. Our prime objectives are to determine if the performance while writing to an SD card can be predicted on both throughput and latency and what the effect is of running an HTTP SD web server in parallel to it using the ESP32 microcontroller dual core functionality. We demonstrate that there are peaks in SD card write time of at minimum 50ms that are unpredictable in both height and occurrence and can increase write time by 1500%, it is also demonstrated how the general throughput can be increased through a variety of tests. Finally, it is shown that an HTTP SD web server running in parallel hurts write performance by $12\%$ and how its wireless transfer speed can be maximized when a file write is happening simultaneously. These results can be directly applied to the engineering of a performance-optimized SD-based storage solution and an HTTP SD web server that can run separately or concurrently. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology, 54 computer science |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/82256 |
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