Log: Single thread hash performance is ~49 MB/s

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1

With 0.14.2 I see the following logged:

[KI3N7] 10:43:11 INFO: syncthing v0.14.2 "Dysprosium Dragonfly" (go1.6.3 darwin-amd64) jb@apto.nym.se 2016-07-26 11:55:25 UTC
[KI3N7] 10:43:11 INFO: My ID: KI3N7[snip]
[KI3N7] 10:43:12 INFO: Single thread hash performance is ~49 MB/s

Previously it was in aways >150 MB/sec.

System is a MB Pro 12,1 with dual core i5 2.9 Ghz.

Top shows: CPU usage: 3.41% user, 4.87% sys, 91.70% idle, so it’s not other processes running that are dramatically slowing things down.

On another system I have (Haswell 2620v3 @ 2.4ghz):

Jul 27 06:45:00 <user.notice> syncthing syncthing: [UZP5V] 06:45:00 INFO: syncthing v0.14.2 "Dysprosium Dragonfly" (go1.6.3 freebsd-amd64) unknown-user@lx-buildslave.syncthing.net 2016-07-26 11:55:25 UTC
Jul 27 06:45:00 <user.notice> syncthing syncthing: [UZP5V] 06:45:00 INFO: My ID: UZP5V[snip]
Jul 27 06:45:00 <user.notice> syncthing syncthing: [UZP5V] 06:45:00 INFO: Single thread hash performance is ~174 MB/s

And another, Surface Laptop shows around 121 MB/sec, and that’s with a junk Core m3-6Y30.

Did something change with the darwin-amd64 build to slow down hashing?

2

It’s sampled over a seconds period, so if in that second the CPU was busy, you’d see that. See if restarting changes anything.

3

Restarted a lot of times to see:

e.g.

$ grep MB/s *
syncthing.stdout:[KI3N7] 10:35:00 INFO: Single thread hash performance is ~36 MB/s
syncthing.stdout:[KI3N7] 10:42:08 INFO: Single thread hash performance is ~47 MB/s
syncthing.stdout:[KI3N7] 10:43:12 INFO: Single thread hash performance is ~49 MB/s
syncthing.stdout:[KI3N7] 12:30:39 INFO: Single thread hash performance is ~45 MB/s
syncthing.stdout:[KI3N7] 12:31:03 INFO: Single thread hash performance is ~42 MB/s
syncthing.stdout:[KI3N7] 12:31:54 INFO: Single thread hash performance is ~43 MB/s
syncthing.stdout:[KI3N7] 12:33:10 INFO: Single thread hash performance is ~68 MB/s
syncthing.stdout:[KI3N7] 12:33:42 INFO: Single thread hash performance is ~126 MB/s
syncthing.stdout:[KI3N7] 12:33:59 INFO: Single thread hash performance is ~112 MB/s
syncthing.stdout:[KI3N7] 12:34:10 INFO: Single thread hash performance is ~136 MB/s
syncthing.stdout:[KI3N7] 12:34:23 INFO: Single thread hash performance is ~114 MB/s
syncthing.stdout:[KI3N7] 12:34:34 INFO: Single thread hash performance is ~127 MB/s
syncthing.stdout:[KI3N7] 12:34:45 INFO: Single thread hash performance is ~131 MB/s
syncthing.stdout:[KI3N7] 12:34:55 INFO: Single thread hash performance is ~130 MB/s

Nothing happened CPU wise between the 12:30:39 and the ramp up. Wierd. Oh well… must just be one of those things.

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