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Author Topic: Slow print processing  (Read 12867 times)
Fred A
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« Reply #15 on: November 07, 2014, 08:57:06 PM »

OK Terry Z.
The Analyze numbers are fine.
I just went to W 8.1 and redid the tests.
I got the same print file size, 795 mb; same time with Fusion, 3:05 minutes.
I also checked CPU usage at 95%, and memory was 94K.
This was checked while Qimage was building the print file (Processing)

Fred
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TerryZ
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« Reply #16 on: November 07, 2014, 09:08:23 PM »

Fred now that's what I'd like to see! Smiley
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admin
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« Reply #17 on: November 08, 2014, 02:10:54 PM »

Try printing to file and see if the CPU usage goes up.  Set up a print to file page of maybe 8x10 at 600PPI just to test CPU usage on an 8x10 print.  If print to file operates all the CPU's, then it could be a printer driver problem where your printer driver is accepting data very slowly.  If print to file also runs slowly and only uses up to 25% CPU, then something on your system is preventing multi-core usage with QU.  In that case, I think I'd uninstall both QU and your printer driver and reinstall them.  Also try it with anti-virus turned off since I suppose something in an anti-virus package might be able to prevent multi-core usage in running processes.

All I can think of.

Mike
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TerryZ
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« Reply #18 on: November 23, 2014, 02:49:18 AM »

Finally tracked the problem down!
Idiotic as it may be it was a windows set to "power saving" mode that kept Qimage running at 800mhz on a single core. Benchmarks taxed the system enough to kick in all 4 cores at 3.5ghz, but qimage by itself wouldn't do it... Never occurred to me to check as I never touch power management on my desktop, and my ASUS control panel is always set to "performance". Simply switching windows to "performance" lets me hit 25-40% CPU load at 4ghz in qimage: 5x-10x faster depending on job.
Thanks again for the help!
Cheesy
Terry

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Fred A
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« Reply #19 on: November 23, 2014, 10:32:44 AM »

Thanks for reporting back.
Mike will be interested too.

Fred
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« Reply #20 on: November 23, 2014, 01:19:11 PM »

Interesting.  There may be some tweaks you can do at the OS level related to running power saving mode on a 4770.  The 4770 processor is a quad core CPU but because it has 8 logical cores (due to hyper threading), Windows sees it as 8 cores.  We've run QU on other 4770 systems and it'll tax all 8 (logical) CPU's at the 80% to 90% level, only dropping momentarily when it is loading new images to print in the queue.  Bottom line: QU is certainly doing enough to get the system to switch to performance mode so it sounds to me like there's an issue with the power saving vs. performance threshold on your machine.  You might want to Google that and see if there are any settings where you can adjust when the OS switches to the performance mode as I know the other i7 4770 systems we've tested are not having that problem.  QU runs 4 CPU intensive threads at the same time as fast as the CPU will go, so that should certainly be enough to switch it over... provided the OS knows how to switch properly.

Regards,
Mike
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