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Re: cgpdftoraster performance

> I am evaluating the performance of cups against tioga for large
>format printing. I have created a file printer (changed the URI to point to
>a file) and a PPD that just uses the cgpdftoraster filter. The ppd is just a
>copy of the pcl-desnj-2500.ppd with the cupsfilter line changed.

By large format, I'm going to assume something like a 42" device printing at 600 dpi. I know HP has devices with higher resolution, but 600 dpi is sufficient to show the mountain your driver needs to climb.

> While testing I have found the performance to be quite poor, being
>something like two times slower than our Tioga driver for the same file,
>page size and resolution. Looking at the process viewer while printing I
>have seen that most of the processing time is taken by cgpdftoraster and I
>was wondering if there could be any missing setting that I should have used
>in the ppd.

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.

> I also noticed that the filter is not using 100% of it4s cpu and I
>don4t know where that limitation comes from. ?Any ideas?

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

--
Roger L Long
email@hidden
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