[Octave-bug-tracker] [bug #45475] output calling "more" has 10 second delay?

[Johannes Bruns]

Follow-up Comment #26, bug #45475 (project octave):

To shed some light on this issue, I performed a test with clearly defined
conditions. Let me tell you first that I ran the test on my computer which is
connected to the Internet via a 16 MBPS ADSL connection.  

This is the list of my network adapters (the “x” marks an active adapter)
- in regular operations mode they all are active:

(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
(X) VMWare Virtual Ethernet Adapter for VMNet1
(X) VMWare Virtual Ethernet Adapter for VMNet8

This is the content of the script Test_Output.m to generate test data to
show:

% Test the delay of output on screen
Theta1 = ones(10,11);
Theta2 = 2 * ones(10,11);
Theta3 = 3 * ones(1,11);
thetaVec = [ Theta1(:) ; Theta2(:) ; Theta3(:) ];

The idea is to simply list the vector thetaVec ten times with some delay
between the iteration. This is the corresponding test command sequence:

<Launch Octave GUI>
Test_Output [Enter]
thetaVec [Enter]
q
<wait 15 seconds>
thetaVec [Enter]
q
<wait 15 seconds>
… <8 more iterations>
quit

I measured the time between pressing [Enter] after having typed in
“thetaVec” and the display of the first result page.

Test run 1 (15 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
(X) VMWare Virtual Ethernet Adapter for VMNet1
(X) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
7 4 0 7 0 7 0 7 0 4

Test run 2 (20 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
(X) VMWare Virtual Ethernet Adapter for VMNet1
(X) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
7 7 7 4 7 4 0 7 4 7

Test run 3 (30 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
(X) VMWare Virtual Ethernet Adapter for VMNet1
(X) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
7 7 4 7 7 7 7 7 7 7

Test run 4 (30 second delay)
============================
( ) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
( ) Intel  Dual Band Wireless-N 7265
( ) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
0 0 0 0 0 0 0 0 0 0

Test run 5 (30 second delay)
============================
( ) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
( ) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
3 3 3 3 3 3 3 3 3 3

Test run 6 (30 second delay)
============================
( ) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
( ) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
4 3 3 3 3 3 3 3 3 3

Test run 7 (30 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
3 3 3 3 3 3 3 3 3 3


In the following test runs I called “help plot” instead of “thetaVec”:
I measured the time between pressing [Enter] after having typed in “help
plot” and the display of the first result page.

Test run 8 (30 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
(x) VMWare Virtual Ethernet Adapter for VMNet1
(x) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
5 10 10 10 10 10 10 10 10 10 

Test run 9 (30 second delay)
============================
(x) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
(x) Intel  Dual Band Wireless-N 7265
(x) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
5 5 5 5 5 5 5 5 5 5 

Test run 10 (30 second delay)
============================
( ) Cisco AnyConnect Secure Mobile Client Virtual Miniport Adapter for Windows
x64
( ) Intel  Dual Band Wireless-N 7265
( ) Intel Ethernet Connection (3) I218-LM
( ) VMWare Virtual Ethernet Adapter for VMNet1
( ) VMWare Virtual Ethernet Adapter for VMNet8
Measured delays of screen output [sec]:
3 3 3 3 3 3 3 3 3 3


I took the times with a manual stopwatch so the values are just good
approximations. However, you can see the dependency between the screen output
time and the number of active network adapters. Especially the VMWare adapters
cause a significant delay.


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