>I'm still waiting for the same answer
>as you do, for the high CPU request of mod_jk...
Yes, so I do.
I did not find any article or post about that problem. So I did not
check out mod_jserv. Before tomcat, we use jserv without problems. I
think, we will give mod_jserv a chance.
It seems to be a lifelock in mod_jk, because tomcat accepts the
connection, but is not able to reply. I think its that while-loop in
mod_jk:
static int ajpv12_handle_response(ajp12_endpoint_t *p,
jk_ws_service_t *s,
jk_logger_t *l)
{
while(1) {
unsigned to_read = READ_BUF_SIZE;
unsigned acc = 0;
char *buf = NULL;
if(!jk_sb_read(&p->sb, &buf, to_read, &acc)) {
jk_log(l, JK_LOG_ERROR, "ajpv12_handle_response, error
reading
from \n"); return JK_FALSE;
}
if(!acc) {
jk_log(l, JK_LOG_DEBUG, "ajpv12_handle_response, response
body is
done\n"); break;
}
if(write_to_ws) {
if(!s->write(s, buf, acc)) {
jk_log(l, JK_LOG_ERROR, "ajpv12_handle_response, error
writing back to server\n"); write_to_ws = JK_FALSE; <<<<<<<<<HERE
}
}
}
---------------
what do you think?
Greetings,
Timo
Guido Medina wrote:
>
> Yesd, I had, I changed to mod_jserv, I'm still waiting for the same answer
> as you do, for the high CPU request of mod_jk...
>
> Guido.
> ----- Original Message -----
> From: "Timo Carl" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, May 23, 2001 10:37 AM
> Subject: lb-problem with mod_jk: high cpu load on apache when tomcat breaks
> down
>
> > Hello tomcat-users,
> >
> > We are having a problem with mod_jk and load balancing.
> > Does anyone else have had similar problems with that kind of
> > architecture setup?
> >
> > Our System:
> > ===========
> > Alteon switch (round robin)
> > |
> > |
> > three Apache 1.3.19 on three SPARC-Servers (called s1,s2,s3)(3 CPU, 3
> > GB)
> > |
> > |each:
> > mod_jk with lb (in case of s1: 1*s1,0.001*s2,0.001*s3)
> > |
> > |
> > |
> > two tomcats-3.2.1 on each server (jdk1.2.2, native threads, -Xms50M
> > -Xoss4M -Xss4M -Xmx600M)
> >
> > We chose this architecture because the alteon is not able to perform
> > session tracking properly.
> >
> > The Problem:
> > ============
> > On startup, the system works fine. Each java-Process has about 1-8% CPU
> > load.
> > After one day or so, one tomcat takes 40% CPU load or more. I think the
> > reason is inside our applications. But thats not the error I want to
> > post:
> >
> > After the error of a tomcat, the httpd-processes on EACH Server begin to
> > take a lot of CPU time (8-30% each).
> > In server-status I can see that the processes are waiting for a response
> > of that tomcat.
> > Of course I want to have a fault tolerance, but when I have a problem
> > with one server, the other servers go down too.
> >
> >
> > Did/Does anyone have the same problem and/or a similar system
> > architecture?
> > Maybe anyone solved that problem?
> >
> > Greetings and thanks in advance,
> > Timo Carl
--
Timo Carl
Technik & Programmierung
travelchannel GmbH
Kehrwieder 8
D-20457 Hamburg
Telefon +49/40/38617-275
Telefax +49/40/38617-330
http://www.travelchannel.de - das neue Reisen
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