OpenGL using GLUT: example consumes 100% CPU

[anche]

Hello guys!

I am interested in learning openGL using C++ so I've tried this:
http://www.ferdychristant.com/blog/articles/DOMM-72MPPE

I picked the GLUT example and it compiled and ran but it consumed 100% CPU according to the "top" util.

I wonder if this is due to the video driver I am using, or if this because I am generally stupid, or both :)

Here is the output of lspci:

00:00.0 RAM memory: nVidia Corporation MCP67 Memory Controller (rev a2)
00:01.0 ISA bridge: nVidia Corporation MCP67 ISA Bridge (rev a2)
00:01.1 SMBus: nVidia Corporation MCP67 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation MCP67 OHCI USB 1.1 Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation MCP67 EHCI USB 2.0 Controller (rev a2)
00:04.0 USB Controller: nVidia Corporation MCP67 OHCI USB 1.1 Controller (rev a2)
00:04.1 USB Controller: nVidia Corporation MCP67 EHCI USB 2.0 Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation MCP67 IDE Controller (rev a1)
00:07.0 Audio device: nVidia Corporation MCP67 High Definition Audio (rev a1)
00:08.0 PCI bridge: nVidia Corporation MCP67 PCI Bridge (rev a2)
00:09.0 IDE interface: nVidia Corporation MCP67 AHCI Controller (rev a2)
00:0a.0 Ethernet controller: nVidia Corporation MCP67 Ethernet (rev a2)
00:0b.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:0c.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:0d.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:0e.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:0f.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:10.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:11.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev a2)
00:12.0 VGA compatible controller: nVidia Corporation C68 [GeForce 7050 PV / nForce 630a] (rev a2)
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control
01:06.0 Network controller: Atheros Communications Inc. AR922X Wireless Network Adapter (rev 01)Here is the output of lsmod (just in case):

Module Size Used by
cryptd 19801 0
aes_i586 16956 2
aes_generic 38023 1 aes_i586
nls_iso8859_1 12617 0
nls_cp437 12751 0
vfat 17335 0
fat 55505 1 vfat
binfmt_misc 13213 1
dm_crypt 22463 0
vesafb 13449 1
arc4 12473 2
snd_hda_codec_hdmi 27479 1
snd_hda_codec_via 56765 1
snd_usb_audio 91410 1
snd_usbmidi_lib 24388 1 snd_usb_audio
ath9k 103633 0
mac80211 257001 1 ath9k
ath9k_common 13611 1 ath9k
ath9k_hw 300328 2 ath9k,ath9k_common
ath 19141 2 ath9k,ath9k_hw
snd_hda_intel 24140 4
snd_hda_codec 90901 3 snd_hda_codec_hdmi,snd_hda_codec_via,snd_hda_intel
snd_hwdep 13274 2 snd_usb_audio,snd_hda_codec
snd_pcm 80244 4 snd_hda_codec_hdmi,snd_usb_audio,snd_hda_intel,snd _hda_codec
snd_seq_midi 13132 0
snd_rawmidi 25269 2 snd_usbmidi_lib,snd_seq_midi
snd_seq_midi_event 14475 1 snd_seq_midi
snd_seq 51291 2 snd_seq_midi,snd_seq_midi_event
nvidia 7098106 68
ppdev 12849 0
snd_timer 28659 2 snd_pcm,snd_seq
cfg80211 156212 3 ath9k,mac80211,ath
snd_seq_device 14110 3 snd_seq_midi,snd_rawmidi,snd_seq
uvcvideo 66851 0
videodev 75143 1 uvcvideo
snd 55295 22 snd_hda_codec_hdmi,snd_hda_codec_via,snd_usb_audio ,snd_usbmidi_lib,snd_hda_intel,snd_hda_codec,snd_h wdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq _device
soundcore 12600 1 snd
asus_atk0110 17664 0
i2c_nforce2 12906 0
snd_page_alloc 14073 2 snd_hda_intel,snd_pcm
parport_pc 32111 1
k10temp 12951 0
lp 13349 0
parport 36746 3 ppdev,parport_pc,lp
dm_raid45 88410 0
xor 21860 1 dm_raid45
btrfs 527341 0
zlib_deflate 26594 1 btrfs
libcrc32c 12543 1 btrfs
usbhid 41704 0
usb_storage 43946 2
hid 77084 1 usbhid
uas 17676 0
floppy 60032 0
ahci 21591 4
pata_amd 13762 0
forcedeth 58190 0
libahci 25548 1 ahci
ramzswap 13202 0
xvmalloc 13453 1 ramzswap

Does anybody have any ideas what the problem might be?

Thanks in advance,
Anatoly.

[Simian Man]

That example uses 100% CPU because it constantly renders over and over. If you wanted it to not use 100% CPU, you'd have to do the drawing and updating less frequently (with calls to sleep), or only when some event has occurred. Generally games do use nearly 100% CPU, so if that's what you're doing, I wouldn't sweat it.

It's definitely nothing wrong with your hardware :).

[PaulM1985]

That example uses 100% CPU because it constantly renders over and over. If you wanted it to not use 100% CPU, you'd have to do the drawing and updating less frequently (with calls to sleep), or only when some event has occurred. Generally games do use nearly 100% CPU, so if that's what you're doing, I wouldn't sweat it.

It's definitely nothing wrong with your hardware :).

+1

In game programming you are hoping to have > 20fps, leaving you 50ms between frames for processing. I imagine if you put in a sleep of 30ms, you wouldn't recognise any real lag (your rotates will be slower, but not jerky) and you will use less CPU.

Paul