CPU usage on Dual CPU systems
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CPU usage on Dual CPU systems
When I am encoding with Avi2Dvd, the Avi2Dvd process uses up 50% CPU time which is 100% of 1 CPU. Why is the avi2dvd EXE using so much CPU time? This isn't correct is it?
Yessethg wrote:And the freeenc encoders you mentioned are software, correct?
I dont think you understand.
In task manager, it lists all the processes that are running, Freenc.exe is its OWN process, its encoding, so yes, it will be using CPU power.
Avi2Dvd.exe is ANOTHER process, its idle, its a front end, all it does is OPEN freeenc, then wait, then open the next program, then wait etc.
There is no way on earth the AVI2DVD frontend should be using 2.2GHz of cpu power just WAITING for freeenc.exe to finish what it is doing.
It appears that I understand. As you said, the encoder is software and is what is using virtually all the CPU. In my original post, I said
In any case, the software codecs are the issue. If you want to do this fast, you either need hardware support or make use of the x86 MMX extensions.
Codec is short for encoder-decoder, so yes, the software codecs are using all the CPU, as you'd expect. The AVI2DVD framework just generates scripts for other applications that call the codecs, so the AVI2DVD shell doesn't use CPU, but the processes it spawns by virtue of the scipts do.They're software codecs. It sounds right to me. If it used less CPU by lowering the priority, it would just take longer.
In any case, the software codecs are the issue. If you want to do this fast, you either need hardware support or make use of the x86 MMX extensions.
No, i have 2 CPU'ssethg wrote:It appears that I understand. As you said, the encoder is software and is what is using virtually all the CPU. In my original post, I saidCodec is short for encoder-decoder, so yes, the software codecs are using all the CPU, as you'd expect.They're software codecs. It sounds right to me. If it used less CPU by lowering the priority, it would just take longer.
freeenc is NOT multithreaded, and is using most of ONE CPU as you said
however,
Avi2DVD is using 100% of the OTHER CPU by itself, and last time i checked, avi2dvd isnt a codec OR encoder, just a frontend. Im not trying to be rude, i just want someone to fix what is clearly a bug.
I will hapilly post screenshots if you dont believe me
OK, I misunderstood the situation. It makes sense that the codecs are taking up 100% of one CPU. What seems to be an issue is that the particular type of process wait that AVI2DVD uses becomes a blocking wait when the process it is waiting on runs on another processor. I'm a hardware guy, so I can't tell you which form of process wait call would translate into a non-blocking wait when the active task and the waiting task are on separate processors, though I wouldl be very surprised if there were not such a call available.
It obviously doesn't do this on a single processor system, so it is a peculiarity of the particular form of process wait that AVI2DVD is using. Sounds like TrustFm has to find a form of process wait that doesn't block when the task he's waiting for runs on another processor. I would agree that this is a bug.
Sorry for the confusion. You did say it correctly, I misunderstood what you said.
It obviously doesn't do this on a single processor system, so it is a peculiarity of the particular form of process wait that AVI2DVD is using. Sounds like TrustFm has to find a form of process wait that doesn't block when the task he's waiting for runs on another processor. I would agree that this is a bug.
Sorry for the confusion. You did say it correctly, I misunderstood what you said.
Last edited by sethg on Mon Dec 12, 2005 8:40 pm, edited 1 time in total.
sethg wrote:OK, I misunderstood the situation. It makes sense that the codecs are taking up 100% of one CPU. What seems to be an issue is that the particular type of process wait that AVI2DVD uses becomes a blocking wait when the process it is waiting on runs on another processor. I'm a hardware guy, so I can't tell you which form of process wait call would translate into a non-blocking wait when the active task and the waiting task are on separate processors.
It obviously doesn't do this on a single processor system, so it is a peculiarity of the particular form of process wait that AVI2DVD is using. Sounds like TrustFm has to find a form of process wait that doesn't block when the task he's waiting for runs on another processor.
Sorry for the confusion. You did say it correctly, I misunderstood what you said.
like i said, not trying to be rude. I just hope someone takes note of the problem.It seems what you said makes sence, if i set the affinity so that both processes run on 1 CPU, avi2dvd.exe drops to 0% usage. This is handy to know, but irritating to remember to do it manually like that evey time.