☰
Current Page
Main Menu
Home
Home
Editing
FlashBench
Edit
Preview
h1
h2
h3
Keybinding
default
vim
emacs
Markup
Markdown
Plain Text
Pod
RDoc
reStructuredText
AsciiDoc
BibTeX
Creole
MediaWiki
Org-mode
Textile
Help 1
Help 1
Help 1
Help 2
Help 3
Help 4
Help 5
Help 6
Help 7
Help 8
Autosaved text is available. Click the button to restore it.
Restore Text
--- title: FlashBench --- Benchmarking flash media to determine allocation units and page sizes # Flashbench Source github : <https://github.com/bradfa/flashbench> # Samsung Evo 32GB Make : Samsung Model : MB-MP32D Class : Class 10, UHS-1 Capacity : 32GB Allocation Unit : 16MB Write Size : ?? Page Size : ?? ## Bench `sudo ./flashbench -a /dev/sdj --count=100 --blocksize=1024` align 8589934592 pre 1.55ms on 1.85ms post 1.46ms diff 343µs align 4294967296 pre 1.56ms on 1.85ms post 1.48ms diff 330µs align 2147483648 pre 1.55ms on 1.87ms post 1.55ms diff 321µs align 1073741824 pre 1.53ms on 1.75ms post 1.39ms diff 288µs align 536870912 pre 1.51ms on 1.75ms post 1.39ms diff 297µs align 268435456 pre 1.57ms on 1.77ms post 1.37ms diff 296µs align 134217728 pre 1.53ms on 1.85ms post 1.48ms diff 348µs align 67108864 pre 1.53ms on 1.87ms post 1.55ms diff 328µs align 33554432 pre 1.53ms on 1.85ms post 1.48ms diff 348µs align 16777216 pre 1.53ms on 1.75ms post 1.37ms diff 297µs ** align 8388608 pre 1.43ms on 1.6ms post 1.39ms diff 188µs align 4194304 pre 1.42ms on 1.59ms post 1.39ms diff 188µs align 2097152 pre 1.42ms on 1.6ms post 1.37ms diff 205µs align 1048576 pre 1.47ms on 1.6ms post 1.37ms diff 178µs align 524288 pre 1.39ms on 1.6ms post 1.37ms diff 220µs align 262144 pre 1.43ms on 1.6ms post 1.37ms diff 208µs align 131072 pre 1.43ms on 1.6ms post 1.37ms diff 204µs align 65536 pre 1.37ms on 1.6ms post 1.39ms diff 223µs align 32768 pre 1.37ms on 1.6ms post 1.37ms diff 232µs align 16384 pre 1.37ms on 1.6ms post 1.37ms diff 233µs ** align 8192 pre 1.37ms on 1.37ms post 1.37ms diff -1225ns align 4096 pre 1.37ms on 1.37ms post 1.37ms diff 932ns align 2048 pre 1.37ms on 1.37ms post 1.37ms diff 2.79µs ## Analysis * 16MB boundary has performance penalty = allocation unit * 16KB performance penalty = page size # Sandisk Ultra Make : Sandisk Model : SDSDQU-016G-U46A Class : Class 10, UHS-1 Capacity : 16GB Allocation Unit : ?? Write Size : ?? Page Size : ?? ## Bench `sudo ./flashbench -a /dev/sdi --count=100 --blocksize=1024` align 4294967296 pre 1.24ms on 1.25ms post 1.15ms diff 48.3µs align 2147483648 pre 1.12ms on 1.12ms post 1.12ms diff 800ns align 1073741824 pre 1.12ms on 1.12ms post 1.12ms diff 668ns align 536870912 pre 1.12ms on 1.12ms post 1.12ms diff 414ns align 268435456 pre 1.24ms on 1.25ms post 1.16ms diff 46.9µs align 134217728 pre 1.24ms on 1.25ms post 1.16ms diff 44.8µs align 67108864 pre 1.3ms on 1.34ms post 1.23ms diff 71.7µs align 33554432 pre 1.3ms on 1.34ms post 1.23ms diff 71.5µs align 16777216 pre 1.3ms on 1.33ms post 1.23ms diff 69.6µs align 8388608 pre 1.28ms on 1.3ms post 1.18ms diff 72.1µs align 4194304 pre 1.28ms on 1.3ms post 1.25ms diff 37µs ** align 2097152 pre 1.3ms on 1.34ms post 1.23ms diff 70.8µs align 1048576 pre 1.3ms on 1.34ms post 1.23ms diff 70.7µs ** align 524288 pre 1.26ms on 1.26ms post 1.23ms diff 19.6µs align 262144 pre 1.26ms on 1.26ms post 1.23ms diff 19.6µs align 131072 pre 1.25ms on 1.26ms post 1.24ms diff 12.9µs align 65536 pre 1.26ms on 1.26ms post 1.24ms diff 9.64µs ** align 32768 pre 1.26ms on 1.26ms post 1.22ms diff 18.8µs align 16384 pre 1.26ms on 1.26ms post 1.23ms diff 18.7µs align 8192 pre 1.26ms on 1.26ms post 1.23ms diff 19.4µs align 4096 pre 1.23ms on 1.26ms post 1.23ms diff 35.3µs ** align 2048 pre 1.22ms on 1.26ms post 1.24ms diff 29.4µs ## Analysis * Results all over the place * 4MB dip * 1MB boundary has performance penalty = allocation unit? * 64KB dip * 4KB spike <!-- vim: filetype=markdown -->
Uploading file...
Sidebar
# SideBar * [Home][1] * [Projects][2] * * * <!-- --> * [Code][3] * [Tech][4] * [Network][5] * [MediaCentre][6] * [UAV][7] * * * <!-- --> * [Travel][8] * [Music][9] * [Horse Riding][10] * [Study][11] * [Games][12] * [Other Activities][13] * * * <!-- --> * [Car][14] * [House][15] * [Watch][16] * [Clothing][17] * [Miscellany][18] * * * [1]: /Home [2]: /Projects [3]: /Code/Code [4]: /Tech/Tech [5]: /Network/Network [6]: /MediaCentre/MediaCentre [7]: /UAV/UAV [8]: /Travel/Travel [9]: /Music/Music [10]: /HorseRiding/HorseRiding [11]: /Study/Study [12]: /Games/Games [13]: /Do/Do [14]: /Car/Car [15]: /House/House [16]: /Watch/Watch [17]: /Clothing/Clothing [18]: /Miscellany/Miscellany <!-- vim: filetype=markdown -->
Edit message:
Cancel