Disk /dev/sdd: 8 GB, 8019099648 bytes 16 heads, 63 sectors/track, 15538 cylinders, total 15662304 sectors Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System /dev/sdd1 * 63 15661295 7830616 b FAT32
sudo dosfsck /dev/sdd1 dosfsck 3.0.9, 31 Jan 2010, FAT32, LFN /dev/sdd1: 1 files, 1/244646 clusters
$ sudo ./flashbench -a /dev/sdd --blocksize=1024 --count=100 align 1073741824 pre 599µs on 621µs post 599µs diff 22.6µs align 536870912 pre 581µs on 601µs post 579µs diff 21.4µs align 268435456 pre 586µs on 607µs post 583µs diff 22.1µs align 134217728 pre 590µs on 610µs post 591µs diff 19.5µs align 67108864 pre 593µs on 615µs post 597µs diff 20.4µs align 33554432 pre 584µs on 606µs post 587µs diff 20.2µs align 16777216 pre 587µs on 607µs post 588µs diff 19.4µs align 8388608 pre 583µs on 608µs post 587µs diff 23µs align 4194304 pre 583µs on 604µs post 580µs diff 23.1µs align 2097152 pre 575µs on 601µs post 587µs diff 20.2µs align 1048576 pre 587µs on 588µs post 583µs diff 3.37µs align 524288 pre 583µs on 585µs post 582µs diff 2.6µs align 262144 pre 587µs on 592µs post 592µs diff 2.17µs align 131072 pre 586µs on 585µs post 584µs diff 489ns align 65536 pre 585µs on 587µs post 586µs diff 1.63µs align 32768 pre 592µs on 594µs post 585µs diff 5.5µs align 16384 pre 587µs on 590µs post 586µs diff 3.52µs align 8192 pre 588µs on 605µs post 587µs diff 17.2µs align 4096 pre 585µs on 588µs post 587µs diff 2.27µs align 2048 pre 585µs on 583µs post 581µs diff -189ns
$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=4 --random 2MiB 16.6M/s 1MiB 8.21M/s 512KiB 4.06M/s 256KiB 2.45M/s 128KiB 1.23M/s 64KiB 631K/s 32KiB 315K/s ^C
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=1 --random 2MiB 7.23M/s 1MiB 7.22M/s 512KiB 6.36M/s 256KiB 7.84M/s 128KiB 4.76M/s 64KiB 4.64M/s 32KiB 4.49M/s 16KiB 4.25M/s 8KiB 3.43M/s 4KiB 2.44M/s 2KiB 1.19M/s 1KiB 589K/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=1 --random 2MiB 6.61M/s 1MiB 6.22M/s 512KiB 6.12M/s 256KiB 6.29M/s 128KiB 6.18M/s 64KiB 6.23M/s 32KiB 4.88M/s 16KiB 4.74M/s 8KiB 4.14M/s 4KiB 2.41M/s 2KiB 1.19M/s 1KiB 592K/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=2 --random 2MiB 7.64M/s 1MiB 12.2M/s 512KiB 8.75M/s 256KiB 4.91M/s 128KiB 4.73M/s 64KiB 4.65M/s 32KiB 3.34M/s 16KiB 4.28M/s 8KiB 3.39M/s 4KiB 2.41M/s 2KiB 1.2M/s 1KiB 587K/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=2 --random 2MiB 6.41M/s 1MiB 6.55M/s 512KiB 6.3M/s 256KiB 6.18M/s 128KiB 5.77M/s 64KiB 5.76M/s 32KiB 5.46M/s 16KiB 4.79M/s 8KiB 4.26M/s 4KiB 2.46M/s 2KiB 1.19M/s 1KiB 578K/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=3 --random 2MiB 9.38M/s 1MiB 3.28M/s 512KiB 6.47M/s 256KiB 1.69M/s 128KiB 1.76M/s 64KiB 971K/s 32KiB 479K/s 16KiB 264K/s ^C arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=1024 --erasesize=2097152 --open-au-nr=3 --random 2MiB 7.25M/s 1MiB 10.1M/s 512KiB 7.32M/s 256KiB 3.56M/s 128KiB 1.67M/s 64KiB 847K/s ^C
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=2097152 --open-au-nr=3 2MiB 24.2M/s 1MiB 24.2M/s 512KiB 24.1M/s 256KiB 23.1M/s 128KiB 8.03M/s 64KiB 22.6M/s 32KiB 20.1M/s 16KiB 16.4M/s 8KiB 10.9M/s 4KiB 6.48M/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=2097152 --open-au-nr=4 2MiB 24.3M/s 1MiB 12.3M/s 512KiB 3.11M/s 256KiB 1.43M/s 128KiB 690K/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=1048576 --open-au-nr=3 1MiB 6.41M/s 512KiB 7.56M/s 256KiB 5.67M/s 128KiB 6.82M/s 64KiB 11.2M/s 32KiB 5.43M/s 16KiB 6.74M/s 8KiB 6.59M/s 4KiB 2.98M/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=1048576 --open-au-nr=4 1MiB 9.22M/s 512KiB 7.75M/s 256KiB 5.87M/s 128KiB 5.91M/s 64KiB 5.97M/s 32KiB 5.81M/s 16KiB 5.46M/s 8KiB 4.45M/s 4KiB 3.28M/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=1048576 --open-au-nr=5 1MiB 6.64M/s 512KiB 6.48M/s 256KiB 6.25M/s 128KiB 5.38M/s 64KiB 4.59M/s 32KiB 5.27M/s 16KiB 4.98M/s 8KiB 4.16M/s 4KiB 3.03M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --open-au /dev/sdd --blocksize=4096 --erasesize=1048576 --open-au-nr=6 1MiB 7.76M/s 512KiB 3.37M/s 256KiB 1.64M/s 128KiB 761K/s ^C