What is the maximum number of simultaneously open PDF files in PDFNet SDK?

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Jul 8, 2011, 5:21:21 PM7/8/11
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Q: We have a workload which needs to have around 5000 PDF documents
in memory *at the same time*.

After approximately 2100 PDFDoc objects have been instantiated PDFNet
throws an exception [1], stating that no more temp files could be
opened.

The temp folder (%TEMP%) indeed contains ~2100 files named Trn[1-4 hex
digits].tmp.

Now if we disable PDFNet Caching
(pdftron.PDF.PDFNet.SetDefaultDiskCachingEnabled(false)) then it works
fine. But we can’t do that in some cases with limited RAM.

So could you please fix the temp file generator to not error out after
~2100 files?

[1]
pdftron.Common.PDFNetException: Exception:
Message: An error occurred during page import: Could
not open a temporary file. Make sure to close unused documents.

------------------------------

A: The maximum number of PDF files that can be simultaneously opened
in a single process is 2048.
This a hard upper limit for the number of simultaneously open files
accessed through the C run-time library (CRT). For more info, please
see:

http://msdn.microsoft.com/en-us/library/6e3b887c(v=vs.80).aspx
http://stackoverflow.com/questions/870173/is-there-a-limit-on-number-of-open-files-in-windows


Besides SetDefaultDiskCachingEnabled() you could limit the number of
simultaneously opened files to ~2K (e.g. have a cache of documents -
it is very unlikely that all of them need to be used at the same
time), or have multiple simultaneous processes.

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