RE: 24/96 playback via http://

It might be useful to stick in the NULL renderer (datatype/null/renderer) so that there is no CPU usage from decoding and see what
the CPU usage is for http playback. That should tell you how much of the CPU is being used for network versus how much for
decoding/rendering.

Eric

=======================================
Eric Hyche ([email protected])
Principal Engineer
RealNetworks, Inc.


>-----Original Message-----
>From: John Stirling [mailto:[email protected]]
>Sent: Thursday, September 03, 2009 4:29 AM
>To: [email protected]
>Cc: 'Helix client dev'
>Subject: Re: [Helix-client-dev] 24/96 playback via http://
>
>Hi Eric,
>
>Tried that (and a few other http feature combinations) but doesn't really improve things.
>
>Does 35% CPU for file:// playback compared to 55% for http:// sound about right to you ?
>
>If there are any other global HELIX_FEATURES you think might help let me know.
>
>
>
>Eric Hyche wrote:
>
>	John,
>
>	You might try without MIN_HEAP. I believe MIN_HEAP reduces the limiting size of some buffers
>which would probably affect http
>	throughput. Of course, removing MIN_HEAP means that your memory usage will go up.
>
>	Eric
>
>	=======================================
>	Eric Hyche ([email protected])
>	Principal Engineer
>	RealNetworks, Inc.
>
>
>
>
>		-----Original Message-----
>		From: [email protected] [mailto:helix-client-dev-
>[email protected]]
>		On Behalf Of John Stirling
>		Sent: Wednesday, September 02, 2009 6:12 AM
>		To: Helix client dev
>		Subject: [Helix-client-dev] 24/96 playback via http://
>
>		We're having a few issues getting 24/96 .wav to play smoothly via
>		http:// (from a local upnp server)
>
>		We're using an atlas http fsys with the following HELIX_FEATURES -
>
>		# The basic audio only profile
>		exec_profile_file("helix-client-audio-all.pf")
>
>		# Enable function level linking - reduces code size by approx 30%
>		project.AddDefines('HELIX_CONFIG_USE_RLINK')
>
>		# Remove video related stuff
>		project.RemoveDefines('HELIX_FEATURE_VIDEO')
>		project.RemoveDefines("USE_XWINDOWS")
>		project.AddDefines("HELIX_CONFIG_NO_XWINDOWS")
>
>		# Hopefully fixes MP3 Locker playback
>		project.RemoveDefines('HELIX_FEATURE_HTTP_GZIP')
>		project.AddDefines("HELIX_FEATURE_HTTP_MEMCACHE")
>		project.AddDefines("HELIX_FEATURE_MIN_HEAP")
>
>
>		Our CPU load for http:// playback is approx 55%. Playing the same
>		content via local thumbdrive (file://) cpu load is approx 35%. So don't
>		think cpu is getting overloaded.
>
>		Our raw network throughput is approx 620 kB/s with 24/96 .wav content
>		needing 576kB/s (measure using curl <url> > /dev/null). Fairly close to
>		the edge but would have though that should be ok.
>
>		Is there anything obviously wrong with our feature set or are there any
>		HELIX_FEATURES or parameters that would be worth trying or adjusting ?
>
>		Also, can someone explain what these features are for -
>
>		HELIX_FEATURE_HTTP_MEMCACHE
>		HELIX_FEATURE_MIN_HEAP
>		HELIX_FEATURE_HTTPFSYS_MEM_GROWTH_LIMIT
>
>
>		John
>
>
>
>
>
>
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>
>
>