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<font face="Times New Roman, Times, serif">I'v tried this in a Cloud
environment with multiple VMs writing to the same shared file
location. I didn't use tiles, so the results where negative. It
would be a great asset for Cloud environments, however. Is it in
principle possible to build such a facility into GDAL, and if yes,
what kind of funding would it require?<br>
<br>
Jan<br>
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<div class="moz-cite-prefix">On 01/11/2013 02:32 AM, Frank Warmerdam
wrote:<br>
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cite="mid:CA+YzLBe=tbmT3VSoLMo4P78Q4keMTuGq0Eh_=+b_5pNyZy1hzA@mail.gmail.com"
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<pre wrap="">Paul,
Generally speaking - no - GDAL does not now support multi-threaded
writing. Part of this is due to the way stuff gets write-flushed out
of the block cache and partly it is just that none of GDAL supports
multiple threading on a single dataset.
This statement is based on the assumption it is all in one process.
If you want to run different processes with the output to a
pre-existing "fixed location" format like uncompressed GeoTIFF with
tiles that is all preinitialized to some real value then you could
certainly use one output file for many writers as long as case is
taken to not have multiple processes write to the same tile. But GDAL
isn't doing anything to make this easy.
Best regards,
Frank
On Thu, Jan 10, 2013 at 4:12 PM, Kennedy, Paul <a class="moz-txt-link-rfc2396E" href="mailto:P.Kennedy@fugro.com.au"><P.Kennedy@fugro.com.au></a> wrote:
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<pre wrap="">I am looking to parallelize a long duration gridding process, and was
wondering if GDAL can support multiple simultaneous writers from processess?
I am not sure if any of the underlying raster formats support this?
thanks in advance.
regards
pk
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