Re: [9fans] writing code

[andrey mirtchovski <mirtchov@cpsc.ucalgary.ca>]

[-- Attachment #1: Type: text/plain, Size: 1424 bytes --]


NOTE: i originally sent this message (successfuly, according to
plan9.ucalgary's mail server) but since it took so long i'll just
assume some filter decided fcp.c was spam.  i've gzipped it now.
sorry if you get double copies.

andrey

--- original message follows ---

> if you want to experiment, i've attached a version of the Inferno
> cp(1) called "streamcp" that uses this technique to try to speed up
> file transfer; it allows you to specify the number of concurrent reads
> and writes.

attached is the same idea for plan9, done by Aki Nyrhinen (with a
little help from me integrating it with the official plan9 cp).  it
speeds up copy from sources up to tenfold in some occasions.  has
reasonable speed locally.

i heard ioproc is even faster.

% time cp /n/sources/extra/sun.tgz /dev/null
0.00u 0.02s 19.91r   cp /n/sources/extra/sun.tgz /dev/null
% time cp /n/sources/extra/sun.tgz /dev/null
0.00u 0.03s 20.35r   cp /n/sources/extra/sun.tgz /dev/null
% time cp /n/sources/extra/sun.tgz /dev/null
0.00u 0.03s 19.93r   cp /n/sources/extra/sun.tgz /dev/null


% time fcp /n/sources/extra/sun.tgz /dev/null
0.00u 0.01s 4.36r    fcp /n/sources/extra/sun.tgz /dev/null
% time fcp /n/sources/extra/sun.tgz /dev/null
0.00u 0.00s 5.31r    fcp /n/sources/extra/sun.tgz /dev/null
% time fcp /n/sources/extra/sun.tgz /dev/null
0.00u 0.04s 5.36r    fcp /n/sources/extra/sun.tgz /dev/null

[-- Attachment #2: fcp.c.gz --]
[-- Type: application/octet-stream, Size: 1482 bytes --]