Overpass API developpement

[Roland Olbricht <>]

Hi,

> Assume a server with many CPU's (6) and many RAM (24 GB). Is there any
> thumb rule of how many times faster Overpass queries would be with
> Overpass db running totally on a SSD compared with a classic fast hard
> disk?

Usually, with a SSD the server gets CPU bound. With a disk, it is 
usually disk bound.

> Does OP profit from more RAM and CPU's?

Please look into your server load. The individual queries are single 
thread. Hence, it depends on how much queries you would like to run in 
parallel.

More RAM means more data in the cache. This is highly relevant with a 
harddisk and probably less relevant with an SSD. I usually had 32 GB 
machines since the last two or three, and this was enough to let the 
SSDs stay less than busy, despite 8 CPU cores.

Best regards,

Roland