Nagios Support Forum

Hello,

I could not get my hands on our multiprocessor-boxes here (yet) but did a
few
tests on two single-cpu machines, just to see what's up with the phenomen
that
has been described by Markus.

Machine 1: Intel(R) Pentium(R) 4 CPU 2.20GHz, cache size: 512 KB,
1024 MB RAM - IDE Disk
Kernel Linux 2.4.18 sources from kernel.org

Machine 2: Intel(R) Pentium(R) III CPU 1400MHz, cache size: 512 KB,
512 MB RAM - SCSI Disk
Kernel Linux 2.4.7-10 RedHat


Binaries from Nagios 1.0b5 have been compiled with the following compilers
on machine 1:

gcc version 2.95.3 20010315 (release)
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)
gcc version 3.0.2 20010905 (Red Hat Linux 7.1 3.0.1-3)
gcc version 3.1.1 (Thread model: posix)

.configure was called like this for each build:

./configure --prefix=/tmp/nag-[COMPILERVERSION]
--with-command-grp=nobody
--with-init-dir=/etc/init.d
--with-lockfile=/var/lock/subsys/nagios
--with-template-objects
--with-file-perfdata
--with-cgiurl=/nagios/cgi-bin
--with-htmurl=/nagios
--enable-embedded-perl
--with-perlcache
--with-template-extinfo

hosts.cfg contains 1281 Hosts
services.cfg contains 6379 Services
(There are 1272 Hosts that have all the same 5 service-checks ...)

Here are the average runtimes, taken from 30 runs of "time bin/nagios -v
etc/nagios.cfg"
for each build

gcc295 gcc296 gcc301
gcc311
real user sys real user sys real user sys real
user sys

Maschine 1 17,87 15,44 0,332 19,74 16,59 0,360 18.31 15,77 0,344 18,38
15,90 0,338

Maschine 2 9,81 9,77 0,039 9,96 9,90 0,036 libc6-error
libc6-error

No Typo - I suppose it could be the disk subsystem and will investigate
further.

If someone needs the complete results from the 240 test-runs or needs more
details about the setup, just drop me a mail.

Cheers

Rainer Ruecker
--
STAG, Dircksenstrasse 42-44 10178 Berlin, Germany


> -----Original Message-----
> From: Marcus Hildenbrand [mailto:[email protected]]
> Sent: Tuesday, October 15, 2002 12:43 PM
> To: [email protected];
> [email protected]
> Subject: [Nagios-users] Performanceproblems switching to faster server
>
>
> Our current produktive Nagios installation runs on a 4x700 MHz server
> with Suse Linux. We are doing an active monitoring of > 1.100 servers
> with > 5.500 services. Because of the known problems with
> slow CGI's on
> large configurations we decided to test our Nagios installation on a
> 2x2.4 GHz Suse Linux server hoping to get the CGI's faster.
> But we saw
> the opposite. For example the command "time
> /bin/nagios
> -v " gives the following response:
>
>
> 4x700 MHz server:
> ..
> ..
> Things look okay - No serious problems were detected during the
> pre-flight check
>
> real 0m1.866s
> user 0m1.820s
> sys 0m0.050s
>
>
>
> 2x2.4 GHz server:
> ..
> ..
> Things look okay - No serious problems were detected during the
> pre-flight check
>
> real 0m7.428s
> user 0m7.410s
> sys 0m0.020s
>
> Has anyone an idea why this is more than 3 times slower on the faster
> box? This problem also exists for the CGI's.
>
> Thanks Marcus
>
>
>
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