jpeg SIMD (MMX) success!

sugacapra · Post by **sugacapra** » Fri Jul 14, 2006 11:21 am

worked perfectly, with epia (C3) cpu performance improved really.

cpu passed from 43% to 24% for zmc

a real gain!!!

thanks all

jameswilson · Post by **jameswilson** » Fri Jul 14, 2006 11:45 am

i ownder what difference sse3 would make. I must say that the increases in performance seem huge. But obviously only in the jpeg creating department. zma in modetc/mocord obviously still uses the bulk of cpu time. Is there a way of helping these processes or does analysing images take this power regardless due to the nature of the beast

dbosso · Post by **dbosso** » Fri Jul 14, 2006 1:24 pm

Still working great here on my home system with one camera.

I wish I could apply it to my AMD64 8 camera system. I may have to re-do that box as 32bit just for the boost from this library.

-David

jameswilson · Post by **jameswilson** » Fri Jul 14, 2006 5:03 pm

did you notice any major speed gains of 64bit over 32 bit? Obviously there are gains with the mmx but i wouldnt have thought in this application there were big gains in 64 bit, but i may be way off!! lol

dbosso · Post by **dbosso** » Fri Jul 14, 2006 5:09 pm

It's got 6GB of RAM and there are some other things running on it, so I'd like to avoid taking the himem IO performance hit.

I doubt there'd be much of a processor performance difference going to 32bit, other than the huge gains i'd be able to get by using the jpeg-simd lib.

-David

jameswilson · Post by **jameswilson** » Fri Jul 14, 2006 5:13 pm

6GIG whats it running??

essup · Post by **essup** » Fri Sep 08, 2006 7:33 am

jpeg-mmx also now works for me on slackware-current.

yod9999 · Post by **yod9999** » Wed Sep 20, 2006 7:39 pm

i'd just like to reiterate how much difference this alternative libjpeg makes. on a via epia en12000 with one local camera in record mode capturing in colour at 3fps and 640x480, user cpu usage (almost all zma) dropped from ~27% to ~11%. quite impressive. don't know how it'll perform long term yet, but loks good so far

neil

unclerichy · Post by **unclerichy** » Wed Sep 20, 2006 10:50 pm

It's improved my system's ability to monitor a camera on-screen at 352x288 whilst capturing events from up to three cameras with less chance that frames will be lost.

EDIT: Probably shouldn't post last thing at night...

jameswilson · Post by **jameswilson** » Wed Sep 20, 2006 11:07 pm

im starting to be convinced by its long term stabiliuty too

Flash_ · Post by **Flash_** » Thu Sep 28, 2006 12:37 pm

Ok, a bit behind the rest of you, but I've just installed the libs on both my Quad Xeon and the Athlon-64.

Both OS's running Debian Etch (Testing), both CPU sets have MMX capabilities. (Confirmed with cpuid)

Install as given by james.

make install failed on both machines due to:
/usr/bin/install: cannot create regular file `/usr/local/man/man1/cjpeg.1': No such file or directory

Easily fixed with a "mkdir /usr/local/man/man1" (Both my installs only had man4). Re-run make install, fine.

Xeon load before: 3.16 after: 1.86 (Rising to 2.50 depending on alarms)
Athlon load before: 0.86 after: 0.35 (Rising to 0.

No difference in usage that I can see. Thanks dbosso

SyRenity · Post by **SyRenity** » Thu Sep 28, 2006 3:03 pm

Hi Flash.

So this library does run on 64-bit CPU? I recall there were remarks that the 64-bit support is not complete.

Flash_ · Post by **Flash_** » Thu Sep 28, 2006 3:51 pm

I suspect that's referring to a 64-bit OS.

I'm running a 32-bit kernel on a 64-bit CPU so as far as software's concerned, it's 32-bit. Sorry I didn't make that clear.

SyRenity · Post by **SyRenity** » Sun Oct 08, 2006 11:10 am

Hi.

Thanks for the information.

jan · Post by **jan** » Sat Oct 21, 2006 3:27 pm

i can confirm good results on a Celeron 2.53GHz (512ram) with 2x DCS-900 (640x480 ~6fps) on modect (avg. 60% active area)

load average dropped from .6 to .4
idle CPU went from 66% to 76%