Hi Frederik,
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.
daniel
> On Mar 2, 2016, at 1:19 PM, Frederik Ramm <[email protected]> wrote:
>
> Hi,
>
> 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@mat4:~/osrm-backend$ cat .stxxl
>> *disk=/mnt/tmp/stxxl,400000,syscall*
>
> 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?
>
> Bye
> Frederik
>
> --
> Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33"
>
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