5 ms·

A whirlwind tour of Go’s runtime environment variables

142 points by spacey 11y ago

ZoF 11y ago
Site's down for me. http://webcache.googleusercontent.com/search?q=cache:OXupz2ZeSOAJ:dave.cheney.net/2015/11/29/a-whirlwind-tour-of-gos-runtime-environment-variables&hl=en&gl=us&strip=1&vwsrc=0 http://webcache.googleusercontent.com/search?q=cache:OXupz2Z...
- 4ad 11y ago
  Maybe he should use Go instead of PHP.
  - donatj 11y ago
    As a strong proponent of both, I'd say PHP is the better fit for a small blog.
Artemis2 11y ago
There's also GO15VENDOREXPERIMENT in Go 1.5. It enables dependency vendoring with a vendor/ directory for each package. More details here: https://golang.org/s/go15vendor https://golang.org/s/go15vendor.
- sa5 11y ago
  I'm using this now. Looks like they will be releasing an official vendoring mechanism for 1.6. https://blog.golang.org/6years https://blog.golang.org/6years
- mseepgood 11y ago
  Yes, but it's not a variable for the runtime.
thrownaway2424 11y ago
They should let this author commit changes to the runtime package docs, because this explanation of GOMAXPROCS is much more clear than the official docs. This article: "the number of CPUs (whatever your operating system considers to be a CPU) visible to the program at startup." Official docs: "The number of logical CPUs on the local machine can be queried with NumCPU." and "NumCPU returns the number of logical CPUs usable by the current process." The problem with the official docs is they don't mention that the value of NumCPU is locked in at startup and never changes.
- kibwen 11y ago
  The fact that it's locked in at startup might be an implementation detail that they don't want people generally relying on, but I personally don't know if that's the case.
  - thrownaway2424 11y ago
    That may be, but the docs for NumCPU are still just wrong. NumCPU does not return the number of logical processors in the machine. It returns the population count of the cpu mask, at the moment the runtime was initialized.
- dlisboa 11y ago
  He is part of the Go team.
  - 4ad 11y ago
    Dave is a very prolific and important contributor, but he is not on the Go team.
    - lloydde 11y ago
      Splitting hairs; as you say he is a prolific contributor.

142 points by spacey 11y ago

ZoF 11y ago

Site's down for me. http://webcache.googleusercontent.com/search?q=cache:OXupz2ZeSOAJ:dave.cheney.net/2015/11/29/a-whirlwind-tour-of-gos-runtime-environment-variables&hl=en&gl=us&strip=1&vwsrc=0 http://webcache.googleusercontent.com/search?q=cache:OXupz2Z...

4ad 11y ago
Maybe he should use Go instead of PHP.
- donatj 11y ago
  As a strong proponent of both, I'd say PHP is the better fit for a small blog.

Artemis2 11y ago

There's also GO15VENDOREXPERIMENT in Go 1.5. It enables dependency vendoring with a vendor/ directory for each package. More details here: https://golang.org/s/go15vendor https://golang.org/s/go15vendor.

sa5 11y ago
I'm using this now. Looks like they will be releasing an official vendoring mechanism for 1.6. https://blog.golang.org/6years https://blog.golang.org/6years
mseepgood 11y ago
Yes, but it's not a variable for the runtime.

thrownaway2424 11y ago

They should let this author commit changes to the runtime package docs, because this explanation of GOMAXPROCS is much more clear than the official docs. This article: "the number of CPUs (whatever your operating system considers to be a CPU) visible to the program at startup." Official docs: "The number of logical CPUs on the local machine can be queried with NumCPU." and "NumCPU returns the number of logical CPUs usable by the current process." The problem with the official docs is they don't mention that the value of NumCPU is locked in at startup and never changes.

kibwen 11y ago
The fact that it's locked in at startup might be an implementation detail that they don't want people generally relying on, but I personally don't know if that's the case.
- thrownaway2424 11y ago
  That may be, but the docs for NumCPU are still just wrong. NumCPU does not return the number of logical processors in the machine. It returns the population count of the cpu mask, at the moment the runtime was initialized.
dlisboa 11y ago
He is part of the Go team.
- 4ad 11y ago
  Dave is a very prolific and important contributor, but he is not on the Go team.
  - lloydde 11y ago
    Splitting hairs; as you say he is a prolific contributor.