Rclone cache speed (test with Disk Speed Test by Blackmagic)

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10

Looking at your log all the io is still being done in 4k chunks.

Can you try some different power of 2 sizes for iosize - ie some of these?

131072
262144
524288
1048576
2097152
4194304
8388608
16777216
33554432

Try 16777216, 8388608 and 131072

You could also try experimenting with this value (without iosize)

  --max-read-ahead SizeSuffix              The number of bytes that can be prefetched for sequential reads. Not supported on Windows. (default 128k)

If you look through the log you'll see

$ grep 'Read: n' rclone155beta-local-iosize-only.log
2021/03/24 11:21:40 DEBUG : /tempAAA/DiskSpeedTestTemp: >Read: n=4096
2021/03/24 11:21:40 DEBUG : /tempAAA/DiskSpeedTestTemp: >Read: n=4096
...

You'll see all the Reads are 4096 - you want them to be bigger!

Likewise the Writes

$ grep 'Write: n' rclone155beta-local-iosize-only.log
2021/03/24 11:21:34 DEBUG : /tempAAA/DiskSpeedTestTemp: >Write: n=4096
2021/03/24 11:21:34 DEBUG : /tempAAA/DiskSpeedTestTemp: >Write: n=4096
...