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Quick timings

NVMe and NFS, cold cache on client and server. 4.3 GiB in under three seconds.

$ cat /nfs/nvme/Various/ | pv > /dev/null
 4.3GiB 0:00:02 [1.55GiB/s]

The three-disk HDD pool gets around 300 MB/s, but once the ARC picks up the data it goes at NFS + network speed. Cold cache on the client.

$ echo 3 > /proc/sys/vm/drop_caches
$ cat /nfs/hdd/Videos/*.mp4 | pv > /dev/null
16.5GiB 0:00:10 [ 1.5GiB/s]

Samba is heavier somehow.

$ cat /smb/hdd/Videos/*.mp4 | pv > /dev/null
16.5GiB 0:00:13 [1.26GiB/s]

NFS over RDMA from the ARC, direct to /dev/null (which, well, it's not a very useful benchmark). But 2.8 GB/s!

$ time cat /nfs/hdd/Videos/*.mp4 > /dev/null

real    0m6.269s
user    0m0.007s
sys     0m4.056s
$ cat /nfs/hdd/Videos/*.mp4 | wc -c
$ python -c 'print(17.7 / 6.269)'

$ time cat /nfs/hdd/Videos/*.mp4 > /nfs/nvme/bigfile

real    0m15.538s
user    0m0.016s
sys     0m9.731s

# Streaming read + write at 1.13 GB/s

How about some useful work? Parallel grep at 3 GB/s. Ok, we're at the network limit, call it a day.

$ echo 3 > /proc/sys/vm/drop_caches
$ time (for f in /nfs/hdd/Videos/*.mp4; do grep -o --binary-files=text XXXX "$f" & done; for job in `jobs -p`; do wait $job; done)

real    0m5.825s
user    0m3.567s
sys     0m5.929s

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