# Windows or Mac and GOMAXPROCS
**URL:** https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992
**Category:** Support
**Created:** [November 23, 2017, 7:57am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992 "2017-11-23T07:57:08Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Samuel\_Bruyere](https://forum.syncthing.net/u/Samuel_Bruyere)
#### Post date: [November 23, 2017, 7:57am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992/1 "2017-11-23T07:57:08Z")
Hi, I’ve see the option GOMAXPROCS but can’t understand how it works on mac and windows.
Thanks. Sam
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [November 23, 2017, 8:04am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992/2 "2017-11-23T08:04:48Z")
It works the same everywhere, setting the maximum number of CPU threads that will be used for CPU bound work.
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### Author:  [@Samuel\_Bruyere](https://forum.syncthing.net/u/Samuel_Bruyere)
#### Post date: [November 23, 2017, 8:26am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992/3 "2017-11-23T08:26:11Z")
Sorry, I don’t understand how it work.
On Windows I’ve create this comand line
SET GOMAXPROCS=1 syncthing -no-browser -home=%~dp0data\syncthing
On my system all Uc seems to be used. No traces of GOMAXPROCS in the log ☹
Tks. Sam
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [November 23, 2017, 8:31am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992/4 "2017-11-23T08:31:25Z")
That probably depends on what the command line is fed to. Environment variables are complicated in Windows.
[http://www.dowdandassociates.com/blog/content/howto-set-an-environment-variable-in-windows-command-line-and-registry/](http://www.dowdandassociates.com/blog/content/howto-set-an-environment-variable-in-windows-command-line-and-registry/)
Simplest, I think, for testing would be to do it in a command prompt as two separate commands.
```
C:\> SET GOMAXPROCS=1
C:\> syncthing -no-browser -home=%~dp0data\syncthing
```
On Mac, similarly, but one command will suffice:
```
$ GOMAXPROCS=1 syncthing ...
```
If you’re using our plist file on Mac you can add a
```
GOMAXPROCS
1
```
in the section that already has other environment variables and then perform the `launchctl unload`, `launchctl load` dance.
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### Author:  [@system](https://forum.syncthing.net/u/system)
#### Post date: [December 23, 2017, 8:45am UTC](https://forum.syncthing.net/t/windows-or-mac-and-gomaxprocs/10992/5 "2017-12-23T08:45:03Z")
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