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smp apache processes problem

  
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jurgen

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Since: Mar 17, 2004
Posts: 3



(Msg. 1) Posted: Wed Mar 17, 2004 3:28 pm
Post subject: smp apache processes problem
Archived from groups: alt>apache>configuration (more info?)
Hi,

I don't know if my question is off-topic, but here goes:

I have apache-1.3.29 running on a single cpu P4 with Slackware 9.0
installed with kernel 2.4.20. The apache binary is compiled on this machine.

I the same binary (scp-ed) running on a dual AMD Duron with Redhat 8.0
installed with kernel 2.4.18-14smp.

both apaches have 5 listening processes running.

Both apache machines can start apache, the single cpu machine equally
devides load over the 5 processes, but if we check the dual cpu machine,
we see that only 1 process receives all the work, and the other 4
processes stay idle.

Does anyone have any idea on why this is happening?
Can the fact that a binary (dynamically) compiled on a single cpu
machine is running on a SMP machine be the cause of all problems?

Both machines were tested using a few machines running scripts to
generate over 60 requests/sec.


Feedback is highly apreciated.


--

Jürgen -R-


"I don't know, but I will find out!"

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davideyeahsure

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Since: Nov 03, 2003
Posts: 2907



(Msg. 2) Posted: Wed Mar 17, 2004 3:28 pm
Post subject: Re: smp apache processes problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Jurgen Haan <jurgen.TakeThisOut@fake.dom> wrote:
 > devides load over the 5 processes, but if we check the dual cpu machine,
 > we see that only 1 process receives all the work, and the other 4
 > processes stay idle.
 > Does anyone have any idea on why this is happening?

Evidently the dual processor machine is so fast that only one
process is enough to handle the requests.

Davide

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| Due to circumstances beyond your control, you are master of your fate
| and captain of your soul.
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jurgen

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Since: Mar 17, 2004
Posts: 3



(Msg. 3) Posted: Wed Mar 17, 2004 4:25 pm
Post subject: Re: smp apache processes problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Davide Bianchi wrote:

 > Jurgen Haan <jurgen RemoveThis @fake.dom> wrote:
 >
  >>devides load over the 5 processes, but if we check the dual cpu machine,
  >>we see that only 1 process receives all the work, and the other 4
  >>processes stay idle.
  >>Does anyone have any idea on why this is happening?
 >
 >
 > Evidently the dual processor machine is so fast that only one
 > process is enough to handle the requests.
 >
 > Davide
 >

Don't know about that, the 5 forks are already available to the system.
on the single cpu machine situation is likely to be something like the
folowing:
httpd: 4.5% CPU
httpd: 4.3% CPU
httpd: 4.6% CPU
httpd: 4.8% CPU
httpd: 4.5% CPU
(This based on a real situation, don't know the exact figures, but each
process had the same amount of cpu usage, and it was well below 50%
combined)
This isn't too much load, is it? But still the load is spread amongst
the available processes.

On the dual machine, it might be something like this:
httpd: 28.2% CPU
httpd: idle
httpd: idle
httpd: idle
httpd: idle

In the test situation, the dual machine had a constant load of about 1.3

One more note to bring the whole thing in perspective:
single CPU: 2GHz
dual CPU: 2* 700MHz
--

Jürgen -R-


"I don't know, but I will find out!"<!-- ~MESSAGE_AFTER~ -->
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jurgen

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Since: Mar 17, 2004
Posts: 3



(Msg. 4) Posted: Wed Mar 17, 2004 4:51 pm
Post subject: Re: smp apache processes problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Eek! never mind this problem.

Apache is working perfectly.
It seems that the machines use different TOP (linux proces monitor)
versions.
For some strange reason, the lower version top sees the forked processes
of apache as threads. What appears to be one big cpu hogging process is
in reality the apache master processes AND the forked processes combined
together. Since apache 1.3.29 does not support threads (instead it uses
a number of seperate processes) this is a faulty way of displaying
apache procs.

The newer top version displays the processes as seperate processes
(different PIDs, no interproces communication).

So what appeared to be an Apache problem is in reality a problem with
displaying the processes.

--

Jürgen -R-


"I don't know, but I will find out!"
 >> Stay informed about: smp apache processes problem 
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