[Fedora-directory-users] Load Testing question

[Anderson, Cary]

Thanks for the feedback, I have turned on more extensive logging on the
FDS server, Hopefully that will turn something up, but based on the
settings in my sysctl.conf, limits.conf, and ulimit, I should be able to
handle more than 2500 connections, unless I am missing a configuration
parameter.

Ulimit 805696

Sysctl.conf
##############################
# Set Kernel Parameters
# semaphores, SEMMSL, SEMMNS, SEMOPM, SEMMNI:
kernel.sem = 256 32000 100 142
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.msgmax = 8192
kernel.msgmnb = 65535
kernel.msgmni = 2878
fs.file-max = 131072
net.ipv4.ip_local_port_range = 32000 65000

Limits.conf

# Custom setup for Global System Limits:
*               hard    nproc           32767
*               soft    nproc           32767
*               hard    nofile          65536
*               soft    nofile          65536
*               hard    fsize         5000000
*               soft    fsize         1000000



Cary Anderson, Systems Software Specialist
UNIX/Linux Services
Information Technology Services Branch
Technology Services & Support Division / Data Center Section
System Software & Storage Infrastructure
fCalPERS 
Phone: (916) 795-2588  
Fax: (916) 795-2424 



-----Original Message-----
From: fedora-directory-users-bounces at redhat.com
[mailto:fedora-directory-users-bounces at redhat.com] On Behalf Of Patrick
Morris
Sent: Wednesday, June 06, 2007 12:33 PM
To: General discussion list for the Fedora Directory server project.
Subject: Re: [Fedora-directory-users] Load Testing question


On Wed, 06 Jun 2007, Anderson, Cary wrote:

> I am still playing around with load/stress testing my FDS install.  I 
> am using slamd to run the tests, and I am running the basic load, and 
> the basic search tests against my test boxes,  The slamd client and 
> the FDS server are on identical hardware running RHEL4 with 2G memory,

> and 2 Intel Xeon 3.6GHz processors.  The issue I am seeing is that I 
> am getting "cannot connect to the ldap server" errors once I push the 
> "threads per client" past 2400.  My question is am I hitting a limit 
> on the OS (max tcp connections)? Or a FDS limit?  My assumption was 
> that given appropriate hardware, and proper configuration, I could 
> expect FDS to handle more than 2400 concurrent connections.  Any 
> insights as to what I might be missing would be greatly appreciated.

Log entries from your server should give you some insight into why
connections are being refused.

There's a good chance you haven't allocated enough file handles, but
that's a guess.

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