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Re: cgpdftoraster performance

Roger Long wrote:
> ...
Okay, for a ArchD sized (24 x 36) color sheet, you are going to
> get a raster of around 1.2 GB in size. Writing 1.2GB through
> stdio isn't pretty.

Well, you aren't writing or reading with stdio; the cupsRaster
functions read/write using the raw (POSIX) file functions (read,
write, etc.) Also, depending on whether the driver is asking for
RGB or CMYK data, each write will be using a buffer of 43,200 or
57,600 bytes for each write, so the overhead of read/write system
calls is pretty low, too. The rest is just memory bandwidth
limits...

...
Writing 1.2GB of data is likely saturating the I/O and causing the
process to block.

While the pipe could be the limiting factor here, printing to
large format printers is generally limited by the interface speed
(interface between computer and printer) and not by the speed of
the pipe.

--
______________________________________________________________________
Michael Sweet, Easy Software Products mike at easysw dot com
Printing Software for UNIX http://www.easysw.com
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References: 
 >Re: cgpdftoraster performance (From: Roger Long <email@hidden>)



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