Bug 456371

Summary: httpd unable to handle ab -n 1500000 -c 500
Product: Red Hat Enterprise Linux 4 Reporter: Qian Cai <qcai>
Component: httpdAssignee: Joe Orton <jorton>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: 4.6   
Target Milestone: rc   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-07-24 10:56:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Qian Cai 2008-07-23 07:45:44 UTC 
Description of problem:
On nec-em9.rhts.bos.redhat.com (i386), ran

# ab -t 7200 -n 1500000 -c 500 -e load_test_proper.csv
http://nec-em23.rhts.bos.redhat.com/error/noindex.html

This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/

Benchmarking nec-em23.rhts.bos.redhat.com (be patient)
Completed 500000 requests
Completed 1000000 requests
apr_recv: Connection reset by peer (104)
Total of 1140857 requests completed

Changed the command to -c 300 worked without any problem. I have seen this
problem on i386 only so far.

Version-Release number of selected component (if applicable):
Both client and server were RHEL4-U6 GA distros.
httpd-2.0.52-38.ent
httpd-suexec-2.0.52-38.ent
kernel-2.6.9-67.EL

How reproducible:
Always
Comment 1 Joe Orton 2008-07-23 09:02:18 UTC 
Were you using the default httpd.conf?  That has:

MaxClients       256

so it is unsurprising that you see ab errors for concurrency of 500.
Comment 2 Qian Cai 2008-07-23 09:39:34 UTC 
Yes, I was using that default setting.
Comment 3 Joe Orton 2008-07-24 10:56:04 UTC 
This is not entirely surprising behaviour then.  Use a smaller concurrency
setting or increase MaxClients and ServerLimit.