Bug 456371 – httpd unable to handle ab -n 1500000 -c 500

Bug 456371 - httpd unable to handle ab -n 1500000 -c 500

Summary:	httpd unable to handle ab -n 1500000 -c 500

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Enterprise Linux 4
Classification:	Red Hat
Component:	httpd (Show other bugs)
Sub Component:
Version:	4.6
Hardware:	i386 Linux

Priority	low Severity low
Target Milestone:	rc
Target Release:	---
Assigned To:	Joe Orton
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Reported:	2008-07-23 03:45 EDT by CAI Qian
Modified:	2008-07-24 06:56 EDT (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2008-07-24 06:56:04 EDT
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Description CAI Qian 2008-07-23 03:45:44 EDT

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 05:02:18 EDT

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 CAI Qian 2008-07-23 05:39:34 EDT

Yes, I was using that default setting.

Comment 3 Joe Orton 2008-07-24 06:56:04 EDT

This is not entirely surprising behaviour then.  Use a smaller concurrency
setting or increase MaxClients and ServerLimit.

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