[RTTY] FYI - Multiple MMTTY copies with ONE soundcard

[Terry Gerdes]

Windows Server 2003 will also allow several sound card applications to run
simultaneously.

My main ham computer runs 4 ALS4000 sound cards ($18 from CompUsa).  Audio
from each receiver is paralleled on a RTTY patch panel and feed to two sound
cards, see http://www.ab5k.net/PatchPanel.aspx.  There are four MMTTY
instances.  Two are launched by the N1MM Logging program and are ran in
"Standard Profile".  The other two MMTTY instances are launched manually and
operate in one of the other Profiles (Fluttered or MultiPath).

73 - Terry - AB5K


----- Original Message ----- 
From: "Jerry Flanders" <jeflanders at comcast.net>
To: "WriteLog Reflector" <Writelog at contesting.com>
Cc: <RTTY at contesting.com>
Sent: Tuesday, February 22, 2005 9:47 AM
Subject: [RTTY] FYI - Multiple MMTTY copies with ONE soundcard


> After Jerry Pixton explained that XP will permit several sound card
> applications to run simultaneously, I started thinking that it might be
> useful sometimes to have multiple instances of a soundcard TU like MMTTY
> running in order to copy the signal under several different "profiles"
> simultaneously. Sometimes when signals are marginal in a contest I have to
> mentally combine outputs from several different "receive only" TUs to
> extract the exchange data.
>
> So, the obvious question: How many instances of MMTTY can a modern
computer
> run?
>
> It was easy to set up a test: On my 1.5 GHz P4 512 GB machine running XP
> Professional SP2, I started up 6 instances of MMTTY. I set up each
> differently - several profiles, two printing reverse copy, two with a
> notch, one with BPF on.
>
> I wondered how well my new cheapie AMD Sempron 3000+ (2 GHz) 256MB XP Home
> machine would compare, so started up the same test on it.
>
> XP's "Process Monitor" utility reported average processor usage. I removed
> one copy and waited 2 minutes for each step.
>
> All MMTTYs appeared to run well, each printing its independent best guess
> of the signal. Live RTTY signals were present only part of the time.
>
> The performance monitor readings are:
>
> %Processor time       Copies of MMTTY
> Pentium 4 Sempron
> 34 12 6
> 25 10 5
> 23 08 4
> 12 06 3
> 10 04 2
> 05 02 1
> 00 00 0
>
> If you smooth out the steps, it looks like the P4 takes 5% for each copy
> whereas the Sempron takes 2%.
>
> Writelog was not running at the time, but I wouldn't expect it to add much
> load. Looks like modern computers can do MUCH more than we usually ask of
them.
>
> Please forward this to the MMTTY reflector (one copy). I don't subscribe
to it.
>
> Jerry W4UK
>
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