cpu collector failed after 0.000248s: more CPU's than MAXCPU?

[robinbowes]

I'm trying to get node_exporter running on a FreeNAS box, which is based on FreeBSD 10.3 STABLE.

I did this:

• fired up a vagrant box running FreeBSD 10.3 STABLE
• installed node_exporter (from ports)
• copied the node_exporter binary and rc script over the my FreeNAS box.

This works, but I see this error from the node_exporter regularly:

ERRO[1073] ERROR: cpu collector failed after 0.000035s: more CPU's than MAXCPU?  source=node_exporter.go:91

Any idea why I see this?

R.

[SuperQ]

The code for this error comes from cpu_freebsd.go.

I guess there must be something wrong with the way BSD cpu is retrieved.

[McQueen2063]

Yes, it seems that MAXCPU in const maxCPUTimesLen = C.MAXCPU * C.CPUSTATES is always 1. So this collector works on a single vm with 1 cpu / 1 core, but will never work on a multicore system.
CPUSTATES is 5, which is correct. I can't figure out yet, how to provide the actual number of cpu's, as reported by sysctl hw.ncpu or sysctl kern.smp.cpus...

[discordianfish]

Here is a snippet how to get the number of cpus on various OSes: http://stackoverflow.com/questions/150355/programmatically-find-the-number-of-cores-on-a-machine

[discordianfish]

This should be fixed now that the collector is replaced by a pure Go version.

[robinbowes]

Just to confirm - I built this and am running it on my FreeNAS box and it's working just fine.

I wrote up what I did here: https://blog.yo61.com/installing-prometheus-node_exporter-on-freenas/

[discordianfish]

Awesome! And great article, that should help me setting up some VM based tests too!

[reverson]

Will this get pushed to the FreeBSD repos? I just installed from the latest repo for FreeBSD 10 amd64 and I'm still seeing this issue.

[discordianfish]

@reverson You still see the issues with the 0.14-rc1 release? https://github.com/prometheus/node_exporter/releases/tag/v0.14.0-rc.1
The final 0.14.0 isn't released yet. See #441 for status on the next rc.

[reverson]

Ah, I have not tried 0.14-rc1 as I was just using the version from the FreeBSD official repo (on pfsense). I'll wait for 0.14.0 to be released. Thanks @discordianfish

…

On Sun, Feb 26, 2017 at 2:52 AM discordianfish ***@***.***> wrote: @reverson <https://github.com/reverson> You still see the issues with the 0.14-rc1 release? https://github.com/prometheus/node_exporter/releases/tag/v0.14.0-rc.1 The final 0.14.0 isn't released yet. See #441 <#441> for status on the next rc. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#339 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAX4YPH_Cy7W_5MXPc4vtwYMiC5qfJ9rks5rgVlZgaJpZM4Kwvbc> .