Bureaucrats, dave_user, Administrators
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|First public release
|-
|{{oldid|15846|2.0.0}}
|January 2022
|Added the sections
* "Embedded Linux systems with eMMC or SD cards"
* "Example: embedded Linux system equipped with SanDisk SDINBDG4-8G-XI1 eMMC and <code>ext4</code> file system"
|-
|2.0.1
|January 2022
|Minor changes
|}
These tools perform a complete analysis of the eMMC device application accesses, in terms of addresses accessed, frequency and access methods.
The end goal is to calculate the Write Amplification Factor (WAF or WA) seen by the eMMC (or by any other managed-NAND block device). WAF is defined as the ratio of physical data written onto the NAND and the data written by the host.
When the host writes logical sectors of the eMMC, the internal eMMC controller erases and re-programs physical pages of the NAND device. This could cause a management overhead. Large sequential writes aligned to physical page boundaries typically result in minimal overhead and optimal NAND write activity (WAF=~1). Small chunks of random writes could result in a higher overhead (WAF>>1).
