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May 2010
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2010.05.10 15:30 "Re: Increasing the number of files loadable through libtiff", by Simon R Proud
Edward and Olivier, thanks for your replies. I used the info you gave me and have fixed it now. >>If it's the same as that last thread then your problem is probably not >>reading the files The problem occured at the call to TIFFOpen, not when actually reading/writing to files. >>- Examine the underlying cause of your error. Are you exceeding the >>maximum number of file handles allowed? This was the first cause of the error. I had a limit of 1024 and was trying to open ~5000! With that fixed the error persisted, though. But: >>- TIFFOpen() flags: Use "m" to disable memory mapping, and probably "C" to >>enable strip chopping. See >>http://www.remotesensing.org/libtiff/man/TIFFOpen.3tiff.html This fixed it. I now run with the "rmC" flags and it is successfull, even when loading a combined TIFF image set of larger size than the system memory. Out of interest: Is there any reason why memory mapping is enabled by default? Enabling it causes problems like the ones I have been having and, at least in my case, offers no speed advantage. Thanks again for the help. The problem can be regarded as solved. Simon R. Proud wrote: > Hi all, some time ago I posted a thread about not being able to load > large numbers of TIFFs using TiffOpen ( > http://www.asmail.be/msg0054686850.html ), for some reason I can't > reply to that now. Anyway, I have now hit a similar problem again. I > need to open a large number of TIFFs at once (totalling ~18Gb), but > only have 16Gb of memory. Is there any way to overcome this and be > able to open all files simultaneously? I've tried fiddling with the > numerous TIFFOpen options ("rM", "rCm", "rcm" etc) but have had no > luck. > > I only need to read one scanline at a time (which for all files would > total about 20Mb!), so don't see that memory for the entire file is > required. Any ideas, assistance, etc? Apologies if this is a very > basic query, I'm something of a novice programmer. > > Thanks. Simon. > > _______________________________________________ Tiff mailing list: > Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ _______________________________________________ Tiff mailing list: Tiff@lists.maptools.org http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/