NRecord idling at 10% CPU

[nia]

Hi.

NRecord is using 10% CPU ressources when it is simply idle -- i.e. not recording. See attachment. That doesn't seem right.

It's only slightly higher (10-12%) when recording.

What is needed to analyse this issue further?

[skreien]

Mine sits at 6-8% when idle, however when recording it goes to 40-50%. Adding a second simultaneous recording doesn't seem to make any difference to mine either.

[johnsonx42]

Notice also that you've got a dual-core system, which means NRecord is using ~20% of 1 CPU. That seems pretty high, but mine is even worse. I'm seeing about 18%-20% at idle (again a dual core CPU, so that translates to ~36-40% of 1 core), and as much as 50% when recording. GB-PVR Recording Service never used more than 10% even when recording 2 channels at once. With GB-PVR my fans only became audible when recording AND comskipping on 2 channels... now merely recording a single channel is enough to put my fans nearly full speed (and yes, I have cleaned my heatsinks and fan grills within the past month).

[nia]

Wow - What's your tuner doing? Sounds like it has to do a lot more than just transfer the stream to disk...

But it never used to be like that in the old GBPVR days. It just sat there at idle with negelctable ressource draw.

[sub]

Wow - What's your tuner doing? Sounds like it has to do a lot more than just transfer the stream to disk...

That does sound high. He might be doing analog, and since neither his hvr-1250 or hvr-850 have a hardware encoder, this would mean quite a bit of CPU for soft encoding.

But it never used to be like that in the old GBPVR days. It just sat there at idle with negelctable ressource draw.

After seeing your post I checked out the CPU usage on my two NPVR machines, and I cant really see any CPU usage by nrecord.exe. They're pretty much sitting on 0% CPU.

For you guys that do see 10+% CPU usage, does it start out that way immediately after starting the recording service? or does it start to increase?

[sub]

I just checked while recording, and was surprised to see it using 18% while recording a digital channel, but I quickly found that was because I had some extra logging enabled. When I disabled that, I was back down to about 2% while recording

[nia]

Just rebooted and it immediately starts at 10%. And as can be seen from the screendump above, it is staying at that level.

[sub]

Just rebooted and it immediately starts at 10%. And as can be seen from the screendump above, it is staying at that level.

Does your nrecord.log indicate anything is happening at the time? like recording, updating the epg etc?

If you temporarily set it to zero MVP servers, does it make any difference?

[martint123]

Just for info, mine is sat at "bugger all" most of the time

[johnsonx42]

That does sound high. He might be doing analog, and since neither his hvr-1250 or hvr-850 have a hardware encoder, this would mean quite a bit of CPU for soft encoding.

no, digital only. however I do have the analog mpeg-2 encoders and mux registered, but it doesn't seem like that should matter. I will try unregistering them just to be sure.

For you guys that do see 10+% CPU usage, does it start out that way immediately after starting the recording service? or does it start to increase?

Mine starts up at 25%, then settles down to about 20% and usually stays there until a recording starts. There's no recording in progress in this screenshot:

edit/additional comment: When I took that screenshot NRecord had been running for several days and had made dozens of recordings. After taking that screen shot I restarted the recording service, and after a few seconds it settled in at about 18%; the only difference is now memory use is 10% of what it was; presumably that's because it hasn't made any recordings yet.