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Bug 456371 - httpd unable to handle ab -n 1500000 -c 500
Summary: httpd unable to handle ab -n 1500000 -c 500
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: httpd
Version: 4.6
Hardware: i386
OS: Linux
low
low
Target Milestone: rc
: ---
Assignee: Joe Orton
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-07-23 07:45 UTC by Qian Cai
Modified: 2008-07-24 10:56 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2008-07-24 10:56:04 UTC
Target Upstream Version:


Attachments (Terms of Use)

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.


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