XviD for Dual Cores

[veagles]

I have dual core processor. Latest build of XviD uses only one core, where as DivX uses both. Please post a link for the multithreaded version of XviD. I cant find it anywhere. I searched the forum and links given there are dead.

[Sharktooth]

just use the celticdruid build and set the appropriate number of threads.

[BigDid]

Hi,

In case you didn't find it yet: http://celticdruid.no-ip.com/xvid/

Actually very interested in buying an AMD dual-core; would you share some informations like: what model, nominal speed or overclocked, any other comments...
Thanks

Did

[Blue_MiSfit]

The 3800+ X2 is a total bargain right now. They are about $150 for the 939 or AM2 platform at newegg. These chips have a clock speed of 2 GHz, and generally overclock very well, sometimes hitting 2.6 on the stock air cooling with some voltage boost from what I've read.

On the higher end, the 4000+ X2 is just under $400, and also runs at 2 GHz, but it has 2 MB of cache (1MB x 2).

Still, Conroe (Intel Core 2 Duo) really is the better choice at this point in time. They overclock like an RB26DETT engine, and will be very affordable. Of course, theyre not available yet :)

Stock 2.4 GHz hitting 5 GHz+ on water cooling..... freaking unbelievable...

[LordIntruder]

I have dual core processor. Latest build of XviD uses only one core, where as DivX uses both. Please post a link for the multithreaded version of XviD. I cant find it anywhere. I searched the forum and links given there are dead.

It is quite normal, you HAVE to set it up yourself to 2 threads.

In the Xvid configuration window, at the bottom click on "Other Options".

Here you have a line:

"Number of Threads" which is set on "0" by default. Put 2 and now you will encode on 2 threads. :)

[foxyshadis]

0=use process affinity. In other words, automatic.
>0=specify exact # of threads.

Most likely he was using 1.1 instead of 1.2+.

[Koepi]

The SMP-alpha-build on my site also works multithreaded (1.2.-127). Find it following the link in my signature. Please post feedback!

Cheers
Koepi

[Yanaran]

I'm using that one Koepi and as far as I can tell it works great, 98-99% cpu used when encoding. I have the threads set to 2 manually (didn't know 0 would auto detect).

[squid_80]

People, please don't take high cpu usage as a sign that you're getting good performance. It's actually possible for the codec to stall completely while cpu usage shows close to 100%. Compare fps or total encoding time if you want to quote valid figures.

[sysKin]

People, please don't take high cpu usage as a sign that you're getting good performance. It's actually possible for the codec to stall completely while cpu usage shows close to 100%. Compare fps or total encoding time if you want to quote valid figures.
And if someone doesn't believe - try more threads than CPUs in XviD: output will be the same, CPU usage will go up, but encoding speed will go down.

I'm not sure if 0 threads means auto-detection just yet. "Load defaults" should fill the number using auto-detection.

[squid_80]

Dropping the priority in the middle of an encode can do a similar thing.

About that sleep(0) call: There's a function called SwitchToThread() that does something similar, but unlike sleep(0) it yields to lower priority processes. Unfortunately it's not available on anything below NT4.0 i.e. win95, 98 or me.

[Koepi]

Win 9x (the extended DOS-windows-versions) don't support multiprocessors anyways, so I wouldn't even think about using that OS on a highend machine.

Cheers
Koepi

[Yanaran]

It's actually possible for the codec to stall completely while cpu usage shows close to 100%.
Well I though everyone who has used windows knows you can max a cpu without doing anything useful. ;) I guess you aren't allowed to give positive feedback without some valid figures as you call it, so I apologize for that. :p

Settings: Q=3, AS5, MPEG quant, B-VOPS 2/1.62/0, Packed, ME6 VHQ1 VHQ for bframes, chroma optimized, 240 max I-frame, trellis

1280x544 test clip:

XVID 1.1 final: 157s ~50% cpu
Koepi's SMP 0 threads: 155s ~50% cpu
Koepi's SMP 2 threads: 140s ~85% cpu
FPS increase 100*157/140-100=12%

Same clip and settings, with spline36resize(704,368) in avisynth (for dvd-rw):

1.1 final: 73s ~85% cpu
Koepi's 2 threads: 70s ~97% cpu
FPS increase 100*73/70-100=4%

Good enough for me! Keep up the good work :)

[sysKin]

Good enough for me! Keep up the good work :)
What CPU is that?

[Yanaran]

Pentium 4 630 Prescott

[sysKin]

Pentium 4 630 Prescott
Ah, a HT ~ phew, I was worried it was some dual-core :)

[LordIntruder]

0=use process affinity. In other words, automatic.
>0=specify exact # of threads.

Most likely he was using 1.1 instead of 1.2+.

No, "0" means dual-core capacity won't be used and not it is automatic. I have a 4200+, if I use "0" I have no gain if I compare with an old build that is not multi-threaded, the encoding time is the same, the % used is 50% no more. If I set "2", I get a real gain, the encoding time is much faster. I tried to set "3" and "4" and I get no gain and like sysKin said, it is even slower.

Unless you use a specific build were "0" has been coded to be automatic? As for myself I use Koepi build 1.2 under Windows XP Pro.

[BigDid]

... I have a 4200+,...
Hi,

As stated above (http://forum.doom9.org/showthread.php?p=859420#post859420), I am very much interested in live infos from AMD64 x2 users, specially 3800 and 4200.

Merci/ :thanks:

Did

[foxyshadis]

No, "0" means dual-core capacity won't be used and not it is automatic. I have a 4200+, if I use "0" I have no gain if I compare with an old build that is not multi-threaded, the encoding time is the same, the % used is 50% no more. If I set "2", I get a real gain, the encoding time is much faster. I tried to set "3" and "4" and I get no gain and like sysKin said, it is even slower.

Unless you use a specific build were "0" has been coded to be automatic? As for myself I use Koepi build 1.2 under Windows XP Pro.
I noticed after I tested and saw the results. Weird, I thought I had a build with CPU detection (I've updated several times since so it's hard to say), I'm not sure if it was customized or if I was just mistaken. >.> Maybe I haven't noticed since avisynth usually restricts encode speed.

It wouldn't be hard to just plunk x264's new code almost verbatim into it though.

[sysKin]

As stated above (http://forum.doom9.org/showthread.php?p=859420#post859420), I am very much interested in live infos from AMD64 x2 users, specially 3800 and 4200.

Merci/ :thanks:
Hmm what kind of info do you need? Multithreded code was being developed on an X2 4200+ you know ;) Speedup is from ~30% on very fast settings (1st pass) to ~80% on slow settings.

[squid_80]

It wouldn't be hard to just plunk x264's new code almost verbatim into it though.
Other way around - the code to auto-detect cpus has been in xvid since feb and the same code was added to x264 just recently. The VFW frontend just doesn't use it correctly.

[BigDid]

Hmm what kind of info do you need? Multithreded code was being developed on an X2 4200+ you know ;) Speedup is from ~30% on very fast settings (1st pass) to ~80% on slow settings.
Thanks,

So, the more processor dependant, the more speedup, if the app is multi/hyper-threading optimized I suppose.
Actually I gather infos on the 2 above models to take a buying decision when they will be available again (out of stock for my 2 possible french onlines stores :( ). Also I try to get stats on the overclocking possibilities.

So far I have more infos on the 3800 (before the prices cut-down) than on the 4200.
The 3800 seems definitely capable of going up to 2400; above being stepping dependant. Problem is I should not get improvement on my actual 3000@2450 for mono-threaded apps if maxxed @2400 !
Hence the 4200, less stats than the 3800, begins @ 2600 which suits me IF confirmed by other users; see here:http://forum.doom9.org/showthread.php?p=859073#post859073

Main goal will be (xvid) encoding but, from what I have read, the system and any app could benefit; hence my call to users experience.

Did

[pelle412]

Are there any benchmarks out there that shows the performance of both the Pentium D processors and AMD X2 using the multithreaded alpha version of XviD?

[moon1234]

Are there any benchmarks out there that shows the performance of both the Pentium D processors and AMD X2 using the multithreaded alpha version of XviD?

That is not really a good comparison. The better comparison would be to the new Core Duo 2 processor.

[Emp3r0r]

That is not really a good comparison. The better comparison would be to the new Core Duo 2 processor. A comparison of all three would nice as there is likely more users with the Pentium D right now than the Core 2 Duo. Also, since Core 2 Duo isn't widely available at decent prices, some could still be interested in the Pentium D 900 series as it is much cheaper and still overclocks well (4+ghz).

[BigDid]

Are there any benchmarks out there that shows the performance of both the Pentium D processors and AMD X2 using the multithreaded alpha version of XviD? and A comparison of all three would nice as there is likely more users with the Pentium D right now than the Core 2 Duo...
Hi there,

Maybe this link :http://tomshardware.thgweb.de/2005/11/03/benchmark_marathon_82_cpus_von_amd_und_intel/page76.html
or this one: http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2736&p=8
can suits your needs?

Also a very informative thread here: http://forum.doom9.org/showthread.php?t=112621

By the way, no news from Inc; I would'nt like to disturb him so I'll wait a bit more before upping or PM :)

Did