Re: SSHFS makes the ROOT launch speed slow?

Hi Eduard,

   if ROOT is installed locally (and ROOTSYS points to a local directory, I don't directly understand why it would be so slow. We don't scan the local directory excepts for looking for a .rootrc file.

Concerning the .R development. The basics were quickly implemented, but to make it fully and solidly support all ROOT graphics operations does still require a serious amount of manpower, which we can at this time not allocate to this effort. I've played myself with NX as X11 alternative (on my MacBook over a 3G network) and it performed very impressively. See:

http://en.wikipedia.org/wiki/NX_technology

Cheers, Fons.

On 01/02/2011 12:40, Eduard Avetisyan wrote:
>
> Hi Axel,
>
> I think in both cases root was installed and launched locally. What
> differs is the current working directory, which is local in one case and
> remote-via-sshfs in the other. I know since I'm hit with the same problem
> - root starts up MUCH slower if the current directory isn't local. Similar
> (and worse) performance loss is also observed when X is forwarded via ssh
> tunnel, but these issues are unrelated I guess. For the latter case the
> only hope was to use the ".R" command, but this doesn't seem to move much
> in development, at least not from the documentation point of view (sorry
> if I missed any info pages).
>
> Cheers
> Eduard
>
>
> On Tue, 1 Feb 2011, Axel Naumann wrote:
>
>> Hi,
>>
>> You could install ROOT locally and access your files via SSHFS.
>>
>> Cheers, Axel.
>>
>> OKUMURA, Akira wrote on 01/27/2011 07:52 PM:
>>> Hello ROOTers,
>>>
>>> I often use Macfusion (http://macfusionapp.org/) and SSHFS (http://fuse.sourceforge.net/sshfs.html) on my Mac to mount a remote file system via SSH, because X11 is very slow with a slow network connection.
>>>
>>> My problem is that the ROOT launch speed is slow when I launch ROOT in an SSHFS directory.
>>>
>>> This is the result of "time" command on the local file system. It is fast enough.
>>> $ time root -b -q
>>> root [0]
>>> root -l -b -q 0.09s user 0.03s system 97% cpu 0.127 total
>>>
>>> And this is the result when I launch ROOT in a directory which is mounted via SSHFS.
>>> $ time root -b -q
>>> root [0]
>>> root -l -b -q 0.09s user 0.04s system 11% cpu 1.143 total
>>>
>>> In this example, it takes only 1.1 second because the value was measured from my office where LAN speed is fast. But when I do it from my home, it takes 5 to 10 seconds. In worst case, it takes several ten seconds.
>>>
>>> I suppose ROOT does something in a directory when being launch, and hence, it takes long time in the case that SSHFS speed is low.
>>>
>>> Is there any hack to get the launch speed faster?
>>>
>>> ROOT 5.28.00
>>> OS X 10.6.6
>>> Macfusion 2.0.3
>>>
>>> Regards,
>>>
>>> --
>>> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
>>> Institute of Space and Astronautical Science (ISAS/JAXA)
>>> Now at KIPAC/SLAC/Stanford
>>> Varian Physics #306, 382 Via Pueblo Mall, MC 4060
>>> Stanford, CA 94305-4060
>>> TEL 650-736-0971/FAX 650-724-5065
>>> Skype : okumura.akira
>>>
>>>
>>
>>
>

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