Console output oddity

[Chris Faylor]

On Sun, Oct 01, 2000 at 03:17:15AM +0200, Jonas Jensen wrote:
>>I have noticed a very odd behaviour when I am sending a large amount of
>>output to the console screen.
>>If I "cat" a large text file in a bash window it takes about 20 times
>>longer than if I "type" the same file in a DOS window.  If I press and
>>hold down the CONTROL, SHIFT or ALT key as soon as the "cat" is started
>>then it runs about 4 times as fast.  (If I hold the key down while
>>starting the "cat" it runs at the lower speed but the speed increases
>>if I release the key and then press it again.) A simple C program which
>>just loops printing a counter to stdout can be speeded up by a factor
>>of about 4 by holding down a key while it runs.  It can be speeded up
>>by a factor of about 20 by compiling it with the "-mno-cygwin" switch.
>>Can anyone offer an explanation?
>
>I reported this problem some time ago, I think the topic was called
>"printf is faster when piped through tee".  I can't reproduce the
>effects you talk about when holding a key, on my system (W2k) cat is
>actually marginally faster than type.  The C program that you can speed
>up with -mno-cygwin can get almost the same speed increase if piped
>through cat or tee.
>
>AFAIK, the problem was never fixed -- "Patches are Gratefully
>ConsideredT", but I can't fix it and nobody else seems to care...

I would certainly care to have any patch that speeds up any aspect of
Cygwin.

However, if you are referring to slowness when using the CYGWIN=tty
setting, then you should notice considerable speedups in recent cygwin
snapshots.

cgf

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