[OSRM-talk] osrm-extract taking hours to complete
daniel at mapbox.com
Wed Mar 2 21:22:52 UTC 2016
Yes. STXXL has a "memory" backend that avoids disk altogether.
echo "disk=none,200000,memory" > .stxxl
If you've got lots of RAM, this is the best way to make use of it.
> On Mar 2, 2016, at 1:19 PM, Frederik Ramm <frederik at remote.org> wrote:
> On 03/02/2016 09:03 PM, Bjorn Madsen wrote:
>> I added a high speed SSD and pointed the .stxxl towards that to deal
>> with the swap slowdown. That bought me a drop in processing time from 12
>> hrs -> 3-4 hrs.
>> osrm at mat4:~/osrm-backend$ cat .stxxl
> Since we're discussing this, I always wondered why I got STXXL messages
> even when running on a 256 GB RAM machine (could it not simply do
> everything in RAM there). Then tried to have the STXXL file on a ramdisk
> but failed because the Linux "tmpfs" doesn't support some IOCTL
> operation or so that STXXL wants to use. I ended up creating a sparse
> 200 GB file on the ram disk and loopback-mounting that to put an ext4
> file system on it, just to enable STXXL to put its swap file there.
> Surely better approaches exist?
> Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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