CPU/RAM usage

[icedream]

All % are effective CPU usage. The CPU has 4 cores, so 400% would be loading all 4 cores at 100%. CPU values are going up and down around the values, so only approximated values here. Observed with htop via OpenSSH connection.

• Idle (with Engine just sitting on the initial Source screen after bootup): ~7% CPU usage by Engine (572 MB total RAM usage by everything running on OS)
  • htop seems to report CPU 0 peaking to ~20% sometimes with no hint in the process list for why. Some kernel thing?
• Plugging in a disk on the source screen: short ~68% peak (576 MB)
• One source is mounted and sitting on library screen: quick 80% spike, then dropping off to ~9% (588 MB)
• Scrolling through tracks in the library screen: ~45% (594 MB)
• Scrolling through the left side tabs: ~90% with load mostly on CPU 1 (601 MB)

At this point I wanted to isolate playback stats, so I rebooted the player and went straight to loading tracks:

• Playing 1 FLAC track (3:12 min long): 70~80%, mostly loading CPU 1 (617 MB)
  • one Engine thread continuously in D (I/O busy) state as it plays the track
• Idle after playing a track: 60~70%
• Playing 2 FLAC tracks (6:09 min long + the first track): 90~110% (647 MB)
• Playing 3 FLAC tracks (6:41 min long + the other two tracks): ~140% (668 MB)
• Playing 4 FLAC tracks (7:36 min long + the other three tracks): ~190% (685 MB)

It seems that the audio engine does not do anything until the first track is played, from there on it continuously uses a chunk of the available CPU resources. CPU load depends highly on amount of tracks loaded and playing.

I'll report on stressloading the CPU and its effects once I get to it.