[erlang-questions] what means busy_wait in msacc erl 19.0?

[Sergej Jurečko]

What happens if you use +S 3 ? Fewer schedulers can actually perform better sometimes. There will be less need for busy wait and sleep if there are fewer schedulers competing for jobs.


Sergej

> On 27 Jun 2016, at 18:58, Max Lapshin <max.lapshin@REDACTED> wrote:
> 
> I don't see any visible performance degradation with msacc=extra
> 
> I don't even see it with lcnt build.
> 
> Btw, about sbwt and so all. We have to launch erlang in our flussonic with flags: +sbwt short +swt very_low +sfwi 20 +sub true +MBas aoffcaobf +MBacul 0
> 
> without +MBas aoffcaobf +MBacul 0  it is just leaking memory (maybe not leaking, but using it so much, that OOM comes earlier).
> 
> flag   +stbt s that we were using earlier is important to capture better multicast UDP, but make system absolutely unstable (it eats all memory and dies) when some other task is launched on a server, so we have refused from it.
> 
> Flags  +sbwt short +swt very_low +sfwi 20 +sub true  are recommended by our customers.  Without them since 18.3 we get messages from sys_monitor like   long_schedule a and long_gc on a server with 50% usage of CPU.
> 
> If this is considered a problem (because default settings don't allow to work at all =( ), then maybe I can help somehow?
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