[Speex-dev] High CPU usage

[Mark Schilling]

Hi Jean-Marc,

I tried to add VERY_SMALL at the input of the encoder, but that did not change much.

Here's a list of source code locations where denormals appear for the first time as calculation results.

This list is based on a 4 minutes recording of ambient sound that is passed to speexenc 1.2rc1 with the command line
--narrowband --denoise --agc --abr 15000

==============================================
Count        File         Line   Variable
==============================================
6          x filters.c    :367   yi
131        x ltp.c        :71    sum
24         x filters.c    :367   mem[0]
1057       x lpc.c        :193   x[i-lag]
117        x filters.c    :326   mem[0]
1295       x filters.c    :326   yi
1257       x filters.c    :104   mem[0]
7          x filterbank.c :165   tmp
942        x filterbank.c :166   tmp
2387       x lpc.c        :193   x[i]
5          x filters.c    :105   mem[1]
306618     x filters.c    :370   mem[j+1]
21796      x preprocess.c :851   theta
1638       x vbr.c        :139   ener2
1635       x vbr.c        :136   ener1
8037       x filters.c    :306   sum
17852      x lpc.c        :193   d
103519     x ltp.c        :67    part
77910      x ltp.c        :68    part
69331      x ltp.c        :69    part
13687042   x ltp.c        :66    part
4209       x ltp.c        :263   tmp
55351      x preprocess.c :804   st->old_ps[i]
508        x preprocess.c :807   st->prior[i]
217495     x preprocess.c :892   theta
117888     x filters.c    :330   mem[j+1]
==============================================

I hope this is usefull.
Thanks

Mark

-----Original Message-----
From: speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] On Behalf Of Jean-Marc Valin
Sent: Thursday, September 24, 2009 2:34 AM
To: Mark Schilling
Cc: speex-dev at xiph.org
Subject: Re: [Speex-dev] High CPU usage

If you tell me where most of the denormals are happening, I may be able
to fix that. Also, can you try just adding VERY_SMALL to the encoder's
input and see what happens?

	Jean-Marc


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