Re: 22.1.50; insert-file-contents is slow under tramp

[Michael Albinus]

Richard Stallman <address@hidden> writes:

>     Same old scheduler problem that prompted both of
>
>     w32-pipe-read-delay
>     process-adaptive-read-buffering
>
>     Maybe you should try setting process-adaptive-read-buffering to a
>     non-nil non-t value?
>
> Should the defaults for any of these be changed?

Strange. On my test system, the default value for
process-adaptive-read-buffering is t. Using this, or 'keep, I have
very poor access time. Changing it to nil, the access time is
decreased remarkable. I've tested with a 1MB local file with inline
encoding. This time, my test system is a 1GHz PIII with

GNU Emacs 22.1.50.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2007-06-08 on elegiac, modified by Debian

Linux version 2.6.15-27-386 (address@hidden) (gcc version 4.0.3 (Ubuntu 
4.0.3-1ubuntu5)) #1 PREEMPT Fri Dec 8 17:51:56 UTC 2006

I did run every test 3 times, after a first uncounted test (because
there are additional actions for establishing the connection):

1. (process-adaptive-read-buffering t) - the default:

Function Name          Call Count  Elapsed Time  Average Time
=====================  ==========  ============  ============
insert-file-contents   2           35.411358     17.705679
insert-file-contents   2           35.569901     17.7849505
insert-file-contents   2           36.250298     18.125149

2. (process-adaptive-read-buffering 'keep)

Function Name          Call Count  Elapsed Time  Average Time
=====================  ==========  ============  ============
insert-file-contents   2           34.860293     17.4301465
insert-file-contents   2           34.996148000  17.498074000
insert-file-contents   2           35.00383      17.501915

3. (process-adaptive-read-buffering nil)

Function Name          Call Count  Elapsed Time  Average Time
=====================  ==========  ============  ============
insert-file-contents   2           4.8032639999  2.4016319999
insert-file-contents   2           3.095113      1.5475565
insert-file-contents   2           3.258899      1.6294495

Best regards, Michael.