Q: Ghostscript not multi threaded ?
We suspect that Ghostscript is not multi-threaded.  To be safe we probably should declare the Postscript interpreter as not threadable.  When the non-threaded attribute is set, ImageMagick provides a semaphore to serialize the Postscript interpreter.  We'll get this patch in ImageMagick 6.2.6-2 Beta available by tommorrow.
			
			
									
						
										
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				Dilshod
I have the same issue
I posted a similar problem that occurs under Linux and running through Oracle database (which is multithreaded). Today I was coming back to the forum to find if the problem was solved. 
My original post
"Read PDF from BLOB and Export it as PNG BLOB."
http://redux.imagemagick.org/discussion ... php?t=4494
PS. I am using "ImageMagick-6.2.4"
			
			
									
						
										
						My original post
"Read PDF from BLOB and Export it as PNG BLOB."
http://redux.imagemagick.org/discussion ... php?t=4494
PS. I am using "ImageMagick-6.2.4"
The patch to serialize PDF/PS is in ImageMagick 6.2.6-2 Beta which is scheduled for release in about a week.  You can try a pre-release version, just download from ftp://ftp.imagemagick.org/pub/ImageMagick/beta.
			
			
									
						
										
						