Re: [9fans] clarification needed
I'm Kumar. Also, the one that isn't Harold. ak --- Begin Message --- > > your horrible joke gave me an idea to photochop jmk and brucee in this pic: > > > > http://gnathaniel.files.wordpress.com/2007/10/harold_and_kumar_go_to_white_castle__1_.jpg > > > > but, like so many other things plan9, i didn't. so i posted to 9fans. > > Dude. I will PAY you money does that go double for harold and kumar escape from gitmo? by the way, which one's kumar? - erik --- End Message ---
Re: [9fans] clarification needed
> > your horrible joke gave me an idea to photochop jmk and brucee in this pic: > > > > http://gnathaniel.files.wordpress.com/2007/10/harold_and_kumar_go_to_white_castle__1_.jpg > > > > but, like so many other things plan9, i didn't. so i posted to 9fans. > > Dude. I will PAY you money does that go double for harold and kumar escape from gitmo? by the way, which one's kumar? - erik
Re: [9fans] clarification needed
On Fri, Feb 20, 2009 at 12:35 AM, andrey mirtchovski wrote: > On Thu, Feb 19, 2009 at 10:28 PM, Andrew Simmons wrote: >> Is this exchange part of the script for the forthcoming reality TV >> show "Harold and Kumar go to Murray Hill" ? > > your horrible joke gave me an idea to photochop jmk and brucee in this pic: > > http://gnathaniel.files.wordpress.com/2007/10/harold_and_kumar_go_to_white_castle__1_.jpg > > but, like so many other things plan9, i didn't. so i posted to 9fans. Dude. I will PAY you money - Dan C.
[9fans] proxy server
Hello, I have written HTTP proxy server that runs on Plan 9 and is written in Lua. Look http://plan9.aichi-u.ac.jp/netlib/lua/ I developed "proxy.lua" to inspect live HTTP communication therefore the server does nothing but transfer. However I believe adding other functionalities is not so difficult. Kenji Arisawa
[9fans] SIGCSE (was Westin lax for scale 7)
> Any 9fans here? We could do a bof. Ron's post reminds me. Are there going to be any 9fans or Inferno fans at SIGCSE in a couple weeks? If anyone else is interested, I'd be up for an impromptu bof. BLS
Re: [9fans] page(1)
hola,
I haven't had the time to debug it, but readpng() changed
in the last days and it doesn't work correctly anymore.
I jdid yesterday -c /386/bin/png and everything went
back to normal.
On Fri, Feb 20, 2009 at 10:49 PM, erik quanstrom wrote:
> On Fri Feb 20 20:29:55 EST 2009, aku...@mail.nanosouffle.net wrote:
>
>> Neither works for me.
>>
>> term% hget http://9grid.es/screens/screen1.png|page
>> reading through graphics...
>> warning: couldn't read image: readimage: read count 32400 not 64800: screen
>> id in use
>>
>
> you should also try running png directly from sources.
> assuming that this does not work, ...
>
> it seems that here:
> /sys/src/libdraw/readimage.c:103
>
>m = readn(fd, tmp, n);
>if(m != n){
werrstr("readimage: read count %d not %d: %r", m, n);
> Err:
>if(dolock)
>lockdisplay(d);
>
> things are getting confused. i think it would
> be easier to debug if you added
>
>werrstr("");
>
> right before the readn() and recompiled png.
> i can't quite see how that error message could
> result from reading an image.
>
> - erik
>
>
--
Federico G. Benavento
Re: [9fans] page(1)
On Fri Feb 20 20:29:55 EST 2009, aku...@mail.nanosouffle.net wrote:
> Neither works for me.
>
> term% hget http://9grid.es/screens/screen1.png|page
> reading through graphics...
> warning: couldn't read image: readimage: read count 32400 not 64800: screen
> id in use
>
you should also try running png directly from sources.
assuming that this does not work, ...
it seems that here:
/sys/src/libdraw/readimage.c:103
m = readn(fd, tmp, n);
if(m != n){
>>> werrstr("readimage: read count %d not %d: %r", m, n);
Err:
if(dolock)
lockdisplay(d);
things are getting confused. i think it would
be easier to debug if you added
werrstr("");
right before the readn() and recompiled png.
i can't quite see how that error message could
result from reading an image.
- erik
Re: [9fans] page(1)
No, they don't work in png(1) either: term% hget http://9grid.es/screens/screen1.png|png png: loadimage of 243 bytes failed: loadimage: insufficient data term% png n/dump/usr/akumar/plan9/screens/nihongonokawa.png png: loadimage n/dump/usr/akumar/plan9/screens/nihongonokawa.png of 1310720 bytes failed: loadimage: insufficient data (the latter is a snapshot of /dev/screen taken with topng(1)) ak --- Begin Message --- On Fri, Feb 20, 2009 at 5:03 PM, Akshat Kumar wrote: > Lately, page has been having troubles displaying an increasing number > of PNG image files. I'm not sure whether this is due to any recent > changes or what... Even a PNG of /dev/screen taken with topng(1) > renders just the dreaded question-marks. If they fail in page, do they work in png? Do you happen to have another program named "png" in your path before /bin/png? Russ --- End Message ---
Re: [9fans] page(1)
On Fri, Feb 20, 2009 at 5:03 PM, Akshat Kumar wrote: > Lately, page has been having troubles displaying an increasing number > of PNG image files. I'm not sure whether this is due to any recent > changes or what... Even a PNG of /dev/screen taken with topng(1) > renders just the dreaded question-marks. If they fail in page, do they work in png? Do you happen to have another program named "png" in your path before /bin/png? Russ
Re: [9fans] page(1)
Neither works for me. term% hget http://9grid.es/screens/screen1.png|page reading through graphics... warning: couldn't read image: readimage: read count 32400 not 64800: screen id in use --- Begin Message --- On Fri Feb 20 20:05:49 EST 2009, aku...@mail.nanosouffle.net wrote: > Lately, page has been having troubles displaying an increasing number > of PNG image files. I'm not sure whether this is due to any recent > changes or what... Even a PNG of /dev/screen taken with topng(1) > renders just the dreaded question-marks. > > Any ideas what's going on here (as a simple test, you can first try > the screenshot on 9grid.es, which is a PNG, and also isn't rendered > by page(1) for me, then you can try taking your own snapshot with > topng(1))? both of these work for me: ; hget http://9grid.es/screens/screen1.png|page ; hget http://9grid.es/screens/screen1.png|/n/sources/plan9/386/bin/page - erik --- End Message ---
Re: [9fans] page(1)
On Fri Feb 20 20:05:49 EST 2009, aku...@mail.nanosouffle.net wrote: > Lately, page has been having troubles displaying an increasing number > of PNG image files. I'm not sure whether this is due to any recent > changes or what... Even a PNG of /dev/screen taken with topng(1) > renders just the dreaded question-marks. > > Any ideas what's going on here (as a simple test, you can first try > the screenshot on 9grid.es, which is a PNG, and also isn't rendered > by page(1) for me, then you can try taking your own snapshot with > topng(1))? both of these work for me: ; hget http://9grid.es/screens/screen1.png|page ; hget http://9grid.es/screens/screen1.png|/n/sources/plan9/386/bin/page - erik
Re: [9fans] Westin lax for scale 7
On Fri, Feb 20, 2009 at 4:43 PM, Geoffrey Avila wrote: > > When will you be there? Does Sandia have a booth? > we have a coreboot booth. Sadly, this time, no "boot plan9 on coreboot" demos, there just was not time. ron
[9fans] page(1)
Lately, page has been having troubles displaying an increasing number of PNG image files. I'm not sure whether this is due to any recent changes or what... Even a PNG of /dev/screen taken with topng(1) renders just the dreaded question-marks. Any ideas what's going on here (as a simple test, you can first try the screenshot on 9grid.es, which is a PNG, and also isn't rendered by page(1) for me, then you can try taking your own snapshot with topng(1))? ak
Re: [9fans] Westin lax for scale 7
When will you be there? Does Sandia have a booth? -GBA > Any 9fans here? We could do a bof. > > Ron > >
Re: [9fans] Westin lax for scale 7
On Fri Feb 20 19:13:57 EST 2009, aku...@mail.nanosouffle.net wrote: > bof? > birds of a feather. it's a conference thing. - erik
Re: [9fans] Westin lax for scale 7
bof? --- Begin Message --- Any 9fans here? We could do a bof. Ron -- Sent from my mobile device --- End Message ---
[9fans] Westin lax for scale 7
Any 9fans here? We could do a bof. Ron -- Sent from my mobile device
Re: [9fans] impact of dynamic libraries on the speed of fork()
> I wrote a really simple program, forktest.c. Chris beat me to the punch, but I'm posting anyway because I went a different direction. I wrote some rc scripts that make static and dynamic libraries of various sizes and programs that use those libraries (trivially). For each number of functions 1, 10, 100, 1000, 1, 10 I timed static and dynamic execution of a program that conditionally calls that many functions in 1 or 10 libraries. The scripts are attached, run mklibs, then mkprogs, then runtests. Below are the results of a single run on my laptop (fixed with font looks better). I can't spend any more time on this, but it was a fun morning goof-off. Static (functions libraries binary-size user system elapsed) 1 1 556898 0.24 0.50 0.78 10 1 557324 0.28 0.44 0.82 10 10 557913 0.32 0.42 0.81 100 1 561737 0.24 0.50 0.84 100 10 562196 0.28 0.46 0.79 1000 1 609496 0.29 0.47 0.83 1000 10 606381 0.26 0.48 0.84 1 1 1105475 0.30 0.44 0.87 1 10 1083834 0.28 0.47 0.82 10 1 6245494 0.27 0.48 0.88 10 10 6043871 0.28 0.48 0.81 Dynamic (functions libraries binary-size user system elapsed) 1 1 6489 0.49 0.86 1.39 10 1 7322 0.52 0.86 1.45 10 10 7464 0.83 1.14 2.03 100 116366 0.59 0.78 1.42 100 1016177 1.14 1.11 2.35 1000 1 108268 0.55 0.87 1.47 1000 10 104496 0.88 1.12 2.07 1 1 1077758 0.81 0.98 1.89 1 10 1037387 1.12 1.36 2.63 10 1 10915272 2.79 2.50 6.31 10 10 10517862 3.13 3.68 7.13 I think dynamic 100-10 is a fluke, I also think it's interesting that the dynamic binaries are bigger above 1 function calls. Don't know why, don't have time to figure it out. Micah mklibs Description: Binary data mkprog Description: Binary data mkprogs Description: Binary data runtests Description: Binary data
Re: [9fans] impact of dynamic libraries on the speed of fork()
On Fri Feb 20 14:35:45 EST 2009, cmbran...@cox.net wrote: > I wrote a really simple program, forktest.c. > Next, I performed some experiments using this program. Fork is faster > for statically linked executables. It becomes slower as more libraries > are added to a dynamically linked executable. > These tests were done on an x86 machine running Linux. > Here is a transcript of my experiments, followed by the source for forktest. > > -- Chris very nice. i wonder if you may be measuring the performance of memory management more than the performance of dynamic linking. the reason i suspect this is because on my p3 machine i see gcc static 13440 f/s gcc dyn 12953 f/s gcc static 6963 fork + exec/s or the tipoff is the size of the executable: ; ls -l a.out -rwxr-xr-x 1 quanstro users 609298 Feb 20 14:36 a.out for snarky comparison, here are the programs on my system that are that large or larger: --rwxrwxr-x M 48625 sys sys13275174 Jan 16 2006 /bin/gs --rwxrwxr-x M 48625 sys sys 758520 Dec 9 2005 /bin/spin the hard bit would be keeping the memory footprint the same while increasing the number of shared libraries. even in bad cases, this is like 0.2ms/fork + exec. i wonder if the reason that there can be such big differences is that linux fork+exec may have been massaged for such syntetic benchmarks. thus small amounts of extra work might look big. - erik
Re: [9fans] impact of dynamic libraries on the speed of fork()
> I wrote a really simple program, forktest.c. > Next, I performed some experiments using this program. Fork is faster > for statically linked executables. It becomes slower as more libraries > are added to a dynamically linked executable. What fascinates me here is that forktest doesn't even use anything from those other libraries. In the statically linked case, listing an unneeded library is basically a noop. It appears to be rather more involved in the world of GNU shared libraries. BLS
[9fans] impact of dynamic libraries on the speed of fork()
I wrote a really simple program, forktest.c.
Next, I performed some experiments using this program. Fork is faster
for statically linked executables. It becomes slower as more libraries
are added to a dynamically linked executable.
These tests were done on an x86 machine running Linux.
Here is a transcript of my experiments, followed by the source for forktest.
-- Chris
--- begin transcript ---
Script started on Fri 20 Feb 2009 01:23:10 PM CST
% dietcc forktest.c # link statically against dietlibc
% ./a.out
30864.1 forks per second
% gcc forktest.c # compile with gcc, dynamic linking
% ./a.out
15723.3 forks per second
% gcc forktest.c -lm # pull in the math library
% ./a.out
14792.9 forks per second
% gcc forktest.c -lm -lcurses
% ./a.out
13888.9 forks per second
% gcc forktest.c -lm -lcurses -lpthread
% ./a.out
11961.7 forks per second
% . gcc forktest.c -lm -lcurses -lpthread -lresolv
% ./a.out
11013.2 forks per second
% gcc forktest.c -lm -lcurses -lpthread -lresolv -lssl
% ./a.out
8250.83 forks per second
% gcc forktest.c -lm -lcurses -lpthread -lresolv -lssl -lreadline
% ./a.out
7961.78 forks per second
% exit
Script done on Fri 20 Feb 2009 01:27:20 PM CST
--- end transcript ---
---begin forktest.c---
#include
#include
#include
#include
#include
#include
#include
int
main(void)
{
double elapsed_secs;
int forks = 0;
clock_t start = clock(), elapsed;
int i;
for(i = 0; i < 25000; i++) {
int waitstatus;
switch (fork()) {
case -1:
perror("fork");
break;
case 0:
exit(42);
default:
wait(&waitstatus);
++forks;
break;
}
}
elapsed = clock() - start;
elapsed_secs = (double)elapsed / CLOCKS_PER_SEC;
printf("%g forks per second\n", (double)forks / elapsed_secs);
exit(0);
}
---end forktest.c---
Re: [9fans] Calling vac from C
On Fri Feb 20 11:18:41 EST 2009, urie...@gmail.com wrote: > One of the main costs of dynamic linking is making fork much slower. > Even on linux statically linked binaries fork a few magnitude orders > faster than dynamically linked ones. > > The main source of anti-fork FUD turns out to be the alleged > 'solution' to a problem that didn't exist until the geniuses at Sun > decided dynamic linking was such a wonderful idea. very generally, i agree with the direction of your post. but i do remember things a bit differently. iirc, this went the other way 'round. fork itself was very expensive on sun hardware in the early 90s if one had some memory mapped. sun mmus had issues. i benchmarked a vax 11/780 vs a sun 670mp. the 4x50mhz 670mp was scheduled to replace the 1x5mhz (?) vaxen. the vax forked maybe 10x faster when no memory was allocated. however, when a moderate amount of memory was allocated, the vax pounded the sun by many (3, i think) of magnitude. i posted this info way back when, but can't find a reference. threading became a really hot topic at the time, too. maybe just coincidence, but i'm sure it didn't hurt to be able to show such great improvement. the fork test run on my underpowered p3 machine gets 1800µs/fork-exec. since the p3 does 1836 bogomips and the i7 does 43173, it's safe to assume that linux has fine fork performance, given a reasonable amount of shared libraries. it would be very interesting if someone would see how fork performance relates to the size and number of dynamic libraries. i'm not sure i know how to do this without devoting weeks to the project. - erik
Re: [9fans] Calling vac from C
One of the main costs of dynamic linking is making fork much slower. Even on linux statically linked binaries fork a few magnitude orders faster than dynamically linked ones. The main source of anti-fork FUD turns out to be the alleged 'solution' to a problem that didn't exist until the geniuses at Sun decided dynamic linking was such a wonderful idea. On linux with ancient hardware one can do hundreds of forks per second without any problems, it works great for werc[1], and it is amusing to see people inventing hacks like fcgi and writing pthreaded web servers to avoid as much as one fork call per request, when making hundreds of them is a non-issue. An example of how one mistake in systems design(introduction of dynamic linking) leads to even greater mistakes down the road (pthreads, fcgi, all kinds of hacks to avoid fork), and people never steps back to think if the original design decision was really worth it. Peace uriel [1]: http://werc.cat-v.org On Fri, Feb 20, 2009 at 4:41 PM, erik quanstrom wrote: >> I believe that >> 1) Its too much trouble parsing the output everytime. > > i don't buy that. that takes very little code. since you > have evidently already written the code, the cost > is zero. > > (if you're worried about runtime, i measure parsing > time at 338ns on a core i7 920. cf. attached digestspd.c) > >> 2) Calling some function from an included library will be faster. > > maybe. are you sure that it matters? i measure > base fork/exec latency on a 1.8ghz xeon5000 at 330µs. > (files served from the fileserver, not a ram disk.) > the attached fork.c and nop.c were used to do the > measurement. i measure vac throughput at ~3mb/s > for small files from a brand new venti running from a > ramdisk. the venti was tiny with 5mb isect and 100mb > arenas, and empty. at that rate, 330µs will cost you > 1038 bytes, or 0.3%. > > remember that dynamic linking isn't free. that cost > assumes that dynamic linking is free, and it is not. > > - erik
Re: [9fans] Mail configuration
> Hi there, > I am using plan9port on linux, and I want to be able to read mail from > some account I have in some server running IMAP. > Since this is the first time I try to configure a mail client (gmail > is just so easy) I have no clue on what exactly I should do or if it > is even possible to read mail using plan9's utilities on linux. > The wiki has something about reading email on plan 9, but I do not > know if this should work also for plan9port (to begin with I cannot > find upas/fs). > Probably this a stupid question, so I hope someone could give me some > pointers to start with. there is a very old, very awful, totally unsupported port of upas to p9p in /n/sources/contrib/quanstro/p9p/upas.tbz. upas/fs did work. - erik
Re: [9fans] Mail configuration
> distribution; the file tree is slightly different > than the standard upas/fs (more faithful to imap). > It downloads pieces of the message as it > needs them, so if you have big attachments, > they don't get downloaded until you ask for them. [..] > I used this setup for a few years against a dovecot > imap server. It does not work against the > gmail imap server, because gmail imap > will not serve the full mime tree of the message; > it only gives you the raw message bytes. (n)upas/fs imap4 client uses the body[] syntax to download blocks from the message. this technique also works on gmail. however, gmail lies about message sizes so there's a bit of extra work. > Messages saved with the Save command > go into imap folders, not local files. cool. (n)upas lacks this ability, but has the framework for adding it. it would take a little work to figure out how to handle defaulting to the imap server or to another folder. the folder selection code is already horrible. - erik
Re: [9fans] Calling vac from C
> I believe that
> 1) Its too much trouble parsing the output everytime.
i don't buy that. that takes very little code. since you
have evidently already written the code, the cost
is zero.
(if you're worried about runtime, i measure parsing
time at 338ns on a core i7 920. cf. attached digestspd.c)
> 2) Calling some function from an included library will be faster.
maybe. are you sure that it matters? i measure
base fork/exec latency on a 1.8ghz xeon5000 at 330µs.
(files served from the fileserver, not a ram disk.)
the attached fork.c and nop.c were used to do the
measurement. i measure vac throughput at ~3mb/s
for small files from a brand new venti running from a
ramdisk. the venti was tiny with 5mb isect and 100mb
arenas, and empty. at that rate, 330µs will cost you
1038 bytes, or 0.3%.
remember that dynamic linking isn't free. that cost
assumes that dynamic linking is free, and it is not.
- erik#include
#include
#include
static int
nibble(int c)
{
if(c >= '0' && c <= '9')
return c - '0';
if(c < 0x20)
c += 0x20;
if(c >= 'a' && c <= 'f')
return c - 'a'+10;
return 0xff;
}
static void
bindigest(char *s, uchar *t)
{
int i;
if(strlen(s) != 2*SHA1dlen)
sysfatal("bad digest %s", s);
for(i = 0; i < SHA1dlen; i++)
t[i] = nibble(s[2*i])<<4 | nibble(s[2*i + 1]);
}
static char *vs = "vac:da6b4b5549383cffc1b5691d824fc4bd381f0f6b";
void
main(void)
{
int i, n;
uchar score[SHA1dlen];
uvlong t0, t1;
n = 1000*1000;
t0 = nsec();
for(i = 0; i < n; i++){
if(strncmp(vs, "vac:", 4) == 0)
bindigest(vs + 4, score);
else
sysfatal("bad digest");
}
t1 = nsec();
print("%g\n", 1.*(t1 - t0)/(1.*n));
exits("");
}#include
#include
char *argv[] = {"nop", 0};
void
main(void)
{
int i, n;
uvlong t0, t1;
n = 1;
t0 = nsec();
for(i = 0; i < n; i++)
switch(fork()){
case 0:
exec(*argv, argv);
_exits("exec");
case -1:
sysfatal("fork");
default:
free(wait());
}
t1 = nsec();
print("%g\n", 1.*(t1 - t0)/(1.*n));
exits("");
}#include
#include
void
main(void)
{
exits("");
}
[9fans] tlssrv and tlsclient
Hello, I am hung up! Please any one help me. io% aux/listen1 'tcp!*!8010' /bin/tlssrv -c/sys/tls/cert /bin/aux/ trampoline 'tcp!io!7' term% tlsclient tcp!io!8010 tlsclient: tlsclient: devtls expected ver=301, saw (len=28207) type=2f ver=6269 '/bin/�H��!' term% tlssrv and tlsclient fails in negotiation at version confirmation. what's wrong? - certificate "/sys/tls/cert" is working for Pegasus. - tcp!io!7 is working. - tlsclient can communicate with Pegasus in https protocol. - tlssrv and tlsclient are the most recent ones: term% ls -l /bin/tlssrv /bin/tlsclient --rwxrwxr-x M 9 sys sys 199254 May 10 2008 /bin/tlsclient --rwxrwxr-x M 9 sys sys 199634 Jun 27 2008 /bin/tlssrv term% Kenji Arisawa
Re: [9fans] Mail configuration
> I am using plan9port on linux, and I want to be able to read mail from > some account I have in some server running IMAP. > Since this is the first time I try to configure a mail client (gmail > is just so easy) I have no clue on what exactly I should do or if it > is even possible to read mail using plan9's utilities on linux. > The wiki has something about reading email on plan 9, but I do not > know if this should work also for plan9port (to begin with I cannot > find upas/fs). > Probably this a stupid question, so I hope someone could give me some > pointers to start with. I didn't bring over upas/fs. There is a separate program, not installed by default, in src/cmd/upas/nfs (n=new) that speaks only imap. When installed, its name is mailfs. It works with the nedmail and acme Mail that are in the plan9port distribution; the file tree is slightly different than the standard upas/fs (more faithful to imap). It downloads pieces of the message as it needs them, so if you have big attachments, they don't get downloaded until you ask for them. Messages saved with the Save command go into imap folders, not local files. I used this setup for a few years against a dovecot imap server. It does not work against the gmail imap server, because gmail imap will not serve the full mime tree of the message; it only gives you the raw message bytes. Russ
Re: [9fans] Query regarding vac
> that's probably because vac stores the metadata about > the file as well as the file itself. the score is probably > different because the access time of the file has changed. > > if you really always want the same score for the same > file, i think you'll probably have to hack vac to do what you > want (it shouldn't be hard - either just write the file data itself, > or zero selected metadata). Thank you. I was hoping that there will be some option that might help.. It does not hinder my work altogether, so I will leave it for now. I am behind schedule and really short of time to hack the vac now otherwise I would have given a try. :-) ~Anoop
Re: [9fans] Calling vac from C
On Feb 19, 8:03 am, quans...@quanstro.net (erik quanstrom) wrote: > what's wrong with the tools-based approach > you're currently using? > > this may be hard to believe coming from unix, > but your approach is what many tools do. nobody > links to a tcs library. one uses the tcs(1) > executable. > > executables. god's answer to dynamic linking. > > - erik just a matter of preference :-) I believe that 1) Its too much trouble parsing the output everytime. 2) Calling some function from an included library will be faster. ~Anoop
[9fans] Mail configuration
Hi there, I am using plan9port on linux, and I want to be able to read mail from some account I have in some server running IMAP. Since this is the first time I try to configure a mail client (gmail is just so easy) I have no clue on what exactly I should do or if it is even possible to read mail using plan9's utilities on linux. The wiki has something about reading email on plan 9, but I do not know if this should work also for plan9port (to begin with I cannot find upas/fs). Probably this a stupid question, so I hope someone could give me some pointers to start with. -- Saludos Hugo
Re: [9fans] 2 acmes using plan9port
thanks! R > Heh, I'm doing both of the suggestions in this thread, with a wrapper script: > http://sqweek.dnsdojo.org/plan9/acme > -sqweek
