From: "Thomas Köhler" <jean-luc@picard.franken.de>
To: zsh-users@sunsite.auc.dk
Subject: Re: Prompt expansion, multi-job for
Date: Thu, 6 Jan 2000 15:19:42 +0100 [thread overview]
Message-ID: <20000106151942.A18295@picard.franken.de> (raw)
In-Reply-To: <3874847D.A2ED4AE3@u.genie.co.uk>; from opk@u.genie.co.uk on Thu, Jan 06, 2000 at 01:04:55PM +0100
On Thu, Jan 06, 2000 at 01:04:55PM +0100,
Oliver Kiddle <opk@u.genie.co.uk> wrote:
>
> Andre Pang wrote:
>
> > 2) Is there any way to emulate make's -jn option in the for command?
> > This would be *really* useful for SMP systems. Currently, doing something
> > like "for i in ***/***.wav; do l3enc $i; done" doesn't take advantage of
> > multiple CPUs (on a Linux system, at least); hacking the for command to
> > accept a 'make -j'-like parameter (eg: for -j2 i in *; do l3enc $i; done)
> > would allow us lucky ones who have SMP systems to do many things similar to
> > the above without going mad and writing silly Makefiles simply so we can
> > utilise make -j. If someone's written a function to do this already (Bart?
> > ;) it'd be *very* cool.
>
> If I'm not mistaken, you should be able to do this by running l3enc as a
> background process, i.e. for i in *.wav; do l3enc $i& done. I haven't
> got an SMP system available to me to test but I'd assume that it would
> allocate different l3enc processes to different processors. Putting the
> process in the background means that zsh will get control back
> straight-away and can run the next l3enc.
Well, bad idea if you have a few hundred wavs :)
> The trouble with this is that it will attempt to run all the l3encs
> together. If you have say 4 processors, it may be most efficient to run
> a maximum of 4 l3encs at once. This would be a bit messy to implement in
> Zsh (compared to something like Ada) but can be done.
Well - let's try something like this:
for i in **/*.wav ; do jspool l3enc "'$i'" ; done
jrun 4
Now, we need jspool and jrun. jspool is simple:
function jspool() {
print $@ >> ~/.zjspool/jobs
}
Now, jrun:
function jrun() {
print rm -f ~/.zjspool/jobs >> ~/.zjspool/jobs
print 1 > ~/.zjspool/current
i=0
while [ $i -lt $1 ] ; do
zjrun $i &!
i=$[i+1]
done
}
zjrun is a shell script:
#!/usr/bin/zsh
while : ; do
sleep 1
while [ -f ~/.zjspool/lock ] ; do sleep 5 ; done
print $$ >> ~/.zjspool/lock
PID=$(head -1 ~/.zjspool/lock)
if [ $PID -ne $$ ] ; then continue ; fi
LINE=$(cat ~/.zjspool/current)
if [ ! -f ~/.zjspool/jobs ] ; then
rm -f ~/.zjspool/lock
exit
fi
JOB=$(head -$LINE ~/.zjspool/jobs | tail -1)
print $[LINE + 1] > ~/.zjspool/current
rm -f ~/.zjspool/lock
print -n "$1: "
eval $JOB
done
You get the idea...
Ah - you have 4 jobs running, but you want another important job to run
in between?
echo "XXX" > ~/.zjspool/lock
wait for the 4 running jobs to finish
run your important other stuff
rm ~/.zjspool/lock
> Oliver Kiddle
CU,
Thomas
--
Thomas Köhler Email: jean-luc@picard.franken.de | LCARS - Linux for
<>< WWW: http://home.pages.de/~jeanluc/ | Computers on All
IRC: jeanluc | Real Starships
PGP public key: http://www.mayn.de/users/jean-luc/PGP-Public.asc
next prev parent reply other threads:[~2000-01-06 14:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-01-06 8:44 Andre Pang
2000-01-06 12:03 ` Oliver Kiddle
2000-01-06 14:19 ` Thomas Köhler [this message]
2000-01-06 15:21 ` Oliver Kiddle
[not found] ` <14452.47479.5744.410474@gargle.gargle.HOWL>
2000-01-06 17:47 ` Oliver Kiddle
2000-01-09 0:59 ` Bart Schaefer
2000-01-06 14:54 ` Andre Pang
2000-01-06 12:44 ` Andrej Borsenkow
2000-01-06 14:46 ` Andre Pang
2000-01-06 20:18 ` Peter Stephenson
2000-01-06 11:41 Sven Wischnowsky
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20000106151942.A18295@picard.franken.de \
--to=jean-luc@picard.franken.de \
--cc=zsh-users@sunsite.auc.dk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).