[OSM-dev] Slow rendering

[Alex Chirigiu]

On 04-May-21 17:32, Stephan Knauss wrote:
> I hope that Alex is going to share some figures and optimization 
> results here on the list.
> So @Alex: Even with you potentially paying someone for optimizing your 
> rendering stack, would be great if you could share the results so 
> others could benefit in the future as well. 
-------------------

It might also be ESXI related. If I will find something, I will share it.
That machine acts strange since it won't saturate anything else than RAM.

What we noticed to this point:
     - eventually, it will eat as much RAM as you trow on it
     - if you won't define a swap, it will crash *(so if you experience 
that, try to tweak that **value to 75% of the actual size of RAM)*
     - CPU load is under <50% no matter what (we've tried anything from 
12 to 32 cores)
     - disk usage is around 1 mb/s with some spikes

This is what it will do a few hours after the render started
*1) Huge spike on RAM and it will stay there till will go up again* (it 
wont get down again for nothing)

*2) Huge spike on disk and it will come back *(the controller and that 
RAID should sustain a lot more so I don't think this is the reason for a 
potential bottleneck)

*3) Nothing at all on the CPU *(this is nailed down at 39.xx% usage)




Same settings on that Z600 (but without ESXI) will produce different 
results.

So the main questions here is this: *Does anyone have some experience 
with ESXI machines?


*Best regards,
Alex Chirigiu
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