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CCP14

Methods, Problems and Solutions

BSD UNIX Information for Crystallography

Using ApacheBench to provide a comparison of FreeBSD 4.2 and Redat 7.0 with Apache for High Performance PC Webserving

The CCP14 Homepage is at http://www.ccp14.ac.uk

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[Apache, Redhat and FreeBSD comparison] | [Optimising FreeBSD for Apache and High Performance web serving]

[Summary] | [Web References] | [Test System] | [ApacheBench results] | [ApacheBench Examples]

(Please note that Apache is a good, flexible web server but is not lightning fast. For high capacity serving of static webpages without overwhelming the server computer, thttpd (tiny/turbo/throttling HTTP server) may be a better web server to use.)

Summary so Far (2st Jan 2001)

Still unresolved issues relating to Apache Bench at high -c values vs "Address family not supported by protocol" messages.

The Default FreeBSD kernel is totally useless for handling elevated load tests from ApacheBench. Recompiling the kernel with maxusers=512 and various other tweaks majorly improved the robustness of FreeBSD to handle very nasty loads by ApacheBench.

Using ab (apachebench) and apache 1.3.14 as a test: "Out of the box" Redhat 7.0 craps all over "out of the box" FreeBSD 4.2 (due to default maxfile=16 setting). Default FreeBSD looks totally woeful when compared in this way to Redhat Linux.
After recompiling the FreeBSD kernel with maxusers=512 - on low to "high" (though not extremely high) loads, default Redhat out performs FreeBSD in terms of speed (though the "loads" given out by Redhat are more variable - and at higher loads Redhat always seems to registers a temporary zombie apache process which it then gets rid of after it calms down from the test)

Some web References

(some directly relevant, some not):

Tuning with ab - ApacheBench: http://perl.apache.org/guide/performance.html#Tuning_with_ab_ApacheBench
apache webserver performance testing tools
- httperf - webserver Benchmarking tool, http_load - another webserver Benchmarking tool, ab - ApacheBench (comes with apache), Daquiri - yet another webserver Benchmarking tool
- At http://perl.apache.org/guide/download.html#httperf_webserver_Benchmarking
Web Server Comparisons - comparing apache, thttpd, etc.
- "...factoring out I/O, the primary determinant to server performance is the concurrency strategy."
- apache in this test - barfs at around 125 simultaneous users.
- At http://www.acme.com/software/thttpd/benchmarks.html
JAWS: Understanding High Performance Web Systems
- At http://www.cs.wustl.edu/~jxh/research/research.html
Linux Kernel tuning issue
- At http://www.kegel.com/mindcraft_redux.html#tcp3
The Linux Kernel HOWTO
- At http://www.linuxdoc.org/HOWTO/Kernel-HOWTO.html
How to actually configure the kernel
- At http://www.linuxdoc.org/HOWTO/Kernel-HOWTO-3.html
The linux-kernel mailing list FAQ
- At http://www.tux.org/lkml/
Draft Linux tweaks: (enabling use of a lot of files and many file descriptors)
- socket: Too many open files": http://www.porcupine.org/satan/demo/docs/FAQ.html#processes | http://www.wwdsi.com/cgi-bin/doc.pl?document=FAQ#processes
- socket: Too many open files": http://www.bitmechanic.com/mail-archives/modperl/Jul1999/0570.html
  "Increase the number of allowed filehandles. (How to do this if different from OS to OS. In later linux kernels you just "echo" the new value to a file in the /proc filesystem).
  Btw, we use the Apache/mod_proxy <-> Apache/mod_perl combo with fine fine performance.
  - ask "
- socket: Too many open files": http://www.bitmechanic.com/mail-archives/modperl/Jul1999/0589.html
  " This means `too many open files'. See output of `ulimit -a'. ulimit may help to some extent but probably you will need to reconfigure your kernel (if you can) for higher limits.
  And IMHO benchmarking from localhost will not show real situation with slow modem link users hanging on http connection for the long time. "
- echo 32768 > /proc/sys/fs/file-max
  echo 65536 > /proc/sys/fs/inode-max
  For Bash Shell (just the commands, be wary about using these values):
  
  ulimit -a
  ulimit -n 32768 (max open files)
  ulimit -u 8096 (max user processes)
  ulimit -s 32772 (stack size (kbytes))
- The csh equivalent to 'ulimit -s' is 'limit stack': http://www.absoft.com/linux60tfaq.html
- ulimit: http://www.exim.org/pipermail/exim-users/Week-of-Mon-19990503/012296.html
```
On Mon, May 03, 1999 at 03:43:39PM +0100, Kevin J Collins wrote:

> Here at Heriot-Watt we've just migrated to Exim.  The config is 
> Exim-2.12 running under RedHat 5.2 .  The migration took place 
> over the weekend.  Today with all the users getting in, the 
> machine crashed.  
> 
> According to the Exim logs, there were a lot of 
> "Too many open files in system" entries.
> 
> Is this a Linux problem, an exim problem or a bit of both?

You're running into resource limits for processes. Look at adding a ulimit
statement to your exim startup scripts to make more openfiles available to
exim, eg.:

Assuming you're using bash/sh, find out how many open files are allowed
currently:

ulimit -a

Then:

ulimit -n [bigger number]

If you're using csh/tcsh, use "limit" instead. Read the man pages for more
info.

You may also want to recompile the kernel to allow it to allocate more
resources. Generally, the default kernels that ship with Linux and FreeBSD
aren't compiled for heavy usage, so you have to tune and then recompile
them if your usage is heavy. For linux, you should be able to find a HOWTO
on recompiling the kernel.

-- 
System Administrator
See complete headers for address, homepage and phone numbers
```
- Address family not supported by protocol family. (Many possible reasons)
- Address family not supported by protocol family." : http://www.landfield.com/wu-ftpd/mail-archive/wuftpd-questions/2000/Aug/0008.html
```
> I just installed wu-ftpd 2.6.1 I can log in but when I type ls I get the 
> error 425 Can't build data connection: Address family not supported by 
> protocol family. 
> 
> I am runnis Solaris 8 on a Sun Ultra 60. 
> 
> Has any one seen this? 

Check that /etc/inetd.conf has ftp on an IPV4 address/socket instead of IPV6. 

Koos, want to get examples of before/after on this Sun silliness and 
add it to the FAQ? 
```

Test PC Config and FreeBSD UNIX Install

Default Redhat 7.0 with X and all the garbage that comes with it. Portmap, inetd, etc turned off.

Default minimum install of FreeBSD 4.2 UNIX with man pages and kernel source

FreeBSD 4.2 UNIX with recompiled kernel with maxusers=512 (up from 16)

(Apache compiled fresh from default source code; minspare=5; maxspare=10; startservers=20; maxclients=150)

Viglan 300 MHZ Intel Pentium with 128 Meg RAM
3COMFast Etherlink XL 10/100 Mb TX Ethernet NIC (3C 905B-TX) on IRQ 9
ATI Xpert@Work Video Card (ATI 3D RAGE PRO - DirectX) (MACH64 Drivers based for XFree86 Xwindows)
iiyama 17" MT-9017T video monitor that can do (Frequency: 50/60Hz):
- 1024x768 at 75Hz VESA; 60.02kHz HorizontalFrequency; 75.0kHz Vertical Frequency
- 1280x1024 at 75Hz VESA; 79.98kHz HorizontalFrequency; 75.0kHz Vertical Frequency
Generic Floppy Disk
In board SYMBIOS Logic 875XSID (NCR53c8xx) (Hardcopy Manual: SYM8751SP) PCI Ultra SCSI Host adapter (no devices connected)
SCSI Fujitsu Hard Disk drive with ~8 Gig IDE Hard-disk
Yamaha OPL3-Sax Sound System
Atapi CD-ROM: TEAC CD-532E

Test Results Summary Table

Click here for zip file with: Small, Medium and Large HTML test files

Click here for tar.Z file with: Small, Medium and Large HTML test files

OS

Kernel Tweaked?

Size HTML file (kB)

C - users Concurrency

N No requests

Time taken (sec)

Completed requests

Requests per second

Transfer Rate (Kb / sec)

Ab Errors?

Multi Times?

Mult-time AB error

Temp Zombies Produced?
Load Average

(includes AB)

Redhat 7.0

No

1.5

10

10

0.02

10

500

897

Y

0.01

Redhat 7.0

No

1.5

10

100

.124

100

806

1447

Y

0.01

Redhat 7.0

No

1.5

10

1000

1.24

1000

802

1440

Y

..5 = 1.5

Redhat 7.0

No

1.5

10

10000

12.6

10000

790

1419

Y

.5 = 1.5

Redhat 7.0

No

1.5

10

100000

127.9

100000

781

1403

Not tried

.5 1.7

Redhat 7.0

No

143

10

10

.07

10

144

21140

Y

.05

Redhat 7.0

No

143

10

100

.66

100

150

21960

Y

.05

Redhat 7.0

No

143

10

1000

6.7

1000

148

21732

Y

1 (on multi)

.5

Redhat 7.0

No

143

10

10000

67

10000

148

21672

Y

1 (on multi)

1.2

Redhat 7.0

No

658

10

10

.25

10

39

26307

Y

Redhat 7.0

No

658

10

100

2.5

100

38.7

26083

Y

.2

Redhat 7.0

No

658

10

1000

25.5

1000

39

26309

Y

.7

Redhat 7.0

No

1.5

150

150

.228

150

657

1180

Y

.2

Redhat 7.0

No

1.5

150

1500

1.98

1500

754

1362

Y

.2

Redhat 7.0

No

1.5

150

5000

6.8

5000

731

1332

Y

.4

Redhat 7.0

No

143

150

5000

39.2

5000

127

18857

Y

1

.4

Redhat 7.0

No

658

150

5000

149

5000

33.9

22061

Y

1

1.2

Redhat 7.0

No

1.5

250

250

.47

250

529

996

Y (though goes slow)

.03

Redhat 7.0

No

1.5

250

2500

3.8 = 6.3

2500

651 396

1207 - 718

Y (though goes slow

1

.4

Redhat 7.0

No

658

250

250

9.5

250

26.17

21141

Y

1

.4

Redhat 7.0

No

1.5

500

500

3.6

500

138

253

Y

1

.3

Redhat 7.0

No

1.5

500

5000

10.1

5000

491

907

Y

1

.5 - 3.9

Redhat 7.0

No

658

500

500

17.9

500

27.8

21687

Y

1

1.5

Redhat 7.0

No

1.5

1000

1000

4.3

1000

228.9

436

Y

1

.7

Redhat 7.0

No

1.5

1000

10000

17

10000

587

1060

Y

1

.8

Redhat 7.0

No

658

1000

1000

35.2

1000

28.4

20672

Y

1

.6 = 5.6

Redhat 7.0

No

1.5

1025

1025

socket: Too many open files

OS	Kernel Tweaked?	Size HTML file (kB)	C - users Concurrency	N No requests	Time taken (sec)	Completed requests	Failed requests	Requests per second	Transfer Rate (Kb / sec)	Ab Errors?	Multi Times?	Mult-time AB error	Temp Zombies Produced?	*Load Average* (includes AB)
FreeBSD 4.2	No	1.5	10	10	0.02	10		588	1057		Y			0
FreeBSD 4.2	No	1.5	10	100	.14	100		671	1314		Y			.15
FreeBSD 4.2	No	1.5	10	1000						Server timed out				.1
FreeBSD 4.2	No	1.5	10	10000						Server timed out				.1
FreeBSD 4.2	No	1.5	10	100000						Server timed out
FreeBSD 4.2	No	143	10	10	.08	10		119	17365		Y			.05
FreeBSD 4.2	No	143	10	100	.8	100		119	17490		Y			.06
FreeBSD 4.2	No	143	10	1000						Server timed out
FreeBSD 4.2	No	143	10	10000						Server timed out
FreeBSD 4.2	No	658	10	10	.35	10		27.8	18759		Y			.05
FreeBSD 4.2	No	658	10	100	3.5	100		28.22	19008		Y			.4
FreeBSD 4.2	No	658	10	1000	65	1000		15.3	10332		Y			.8
FreeBSD 4.2	No	1.5	150	150	.25	150		585.9	1052		6	Consol: looutput: mbuf allocation failed AB: socket: No buffer space available		1
FreeBSD 4.2	No	1.5	150	1500						socket: No buffer space available
FreeBSD 4.2	No	1.5	150	5000						socket: No buffer space available
FreeBSD 4.2	No	143	150	5000						Consol: looutput: mbuf allocation failed AB: Server timed out
FreeBSD 4.2	No	658	150	5000						Consol: looutput: mbuf allocation failed AB: Server timed out				3
FreeBSD 4.2	No	1.5	250	250	.4	250		593	1067		3	Consol: looutput: mbuf allocation failed AB: socket: No buffer space available
FreeBSD 4.2	No	1.5	250	2500						Server timed out

OS	Kernel Tweaked?	Size HTML file (kB)	C - users Concurrency	N No requests	Time taken (sec)	Completed requests	Failed requests	Requests per second	Transfer Rate (Kb / sec)	Ab Errors?	Multi Times?	Mult-time AB error	Temp Zombies Produced?	*Load Average* (includes AB)
FreeBSD 4.2	Maxusers=512	1.5	10	10	.019	10		526	228.9		Y			.04
FreeBSD 4.2	Maxusers=512	1.5	10	100	.14	100		714	1283		Y			.01
FreeBSD 4.2	Maxusers=512	1.5	10	1000	1.44	1000		694	1257		Y			.12
FreeBSD 4.2	Maxusers=512	1.5	10	10000	14.1	10000		704	1265		Y			1
FreeBSD 4.2	Maxusers=512	1.5	10	100000	142.7	100000		700	1258		Y			1.8
FreeBSD 4.2	Maxusers=512	143	10	10	.085	10		117	17161		Y			.2
FreeBSD 4.2	Maxusers=512	143	10	100	.828	100		120	17617		Y			..35
FreeBSD 4.2	Maxusers=512	143	10	1000	8.306	1000		120	17562		Y			.57
FreeBSD 4.2	Maxusers=512	143	10	10000	83	10000		120	17574		Y			1.1
FreeBSD 4.2	Maxusers=512	658	10	10	.349	10		28.6	19296		Y			.01
FreeBSD 4.2	Maxusers=512	658	10	100	3.55	100		28.1	18922		Y			.16
FreeBSD 4.2	Maxusers=512	658	10	1000	35.4	1000		28.2	19000		Y			1
FreeBSD 4.2	Maxusers=512	1.5	150	150	.265	150		566	1044		Y			.4
FreeBSD 4.2	Maxusers=512	1.5	150	1500	2.208	1500		679	1225		Y			.5
FreeBSD 4.2	Maxusers=512	1.5	150	5000	7.5	5000		665	1215		Y			.7
FreeBSD 4.2	Maxusers=512	143	150	5000	48.73	5000		102	15223		Y			1.2fs
FreeBSD 4.2	Maxusers=512	658	150	5000	212	5000		23.5	15465		Y			1.6
FreeBSD 4.2	Maxusers=512	1.5	250	250	.41	250		596	1072		Y			.3
FreeBSD 4.2	Maxusers=512	1.5	250	2500	3.8	2500		655	1192		Y			.6
FreeBSD 4.2	Maxusers=512	658	250	250	12.5	250		19.8	15940		Y			.7
FreeBSD 4.2	Maxusers=512	1.5	500	500	.849	500		588	1062		Y			.05
FreeBSD 4.2	Maxusers=512	1.5	500	5000	7.54	5000		658	1197		Y			.5
FreeBSD 4.2	Maxusers=512	658	500	500	25.43	500		19.6	15804		Y			.8
FreeBSD 4.2	Maxusers=512	1.5	1000	1000	1.7	1000		570	1029		Y			.3
FreeBSD 4.2	Maxusers=512	1.5	1000	10000	14.9	10000		667	1203		Y			.8
FreeBSD 4.2	Maxusers=512	658	1000	1000	45	1000		22.7	15574		Y			1
FreeBSD 4.2	Maxusers=512	1.5	1025	1025						Test aborted after 10 failures: Address family not supported by protocol family

Some test runs that can be done with ab (apachebench)

Click here for zip file with: Small, Medium and Large HTML test files

Click here for tar.Z file with: Small, Medium and Large HTML test files

apache webserver performance testing tools
- httperf - webserver Benchmarking tool, http_load - another webserver Benchmarking tool, ab - ApacheBench (comes with apache), Daquiri - yet another webserver Benchmarking tool
- At http://perl.apache.org/guide/download.html#httperf_webserver_Benchmarking
Web Server Comparisons - comparing apache, thttpd, etc.
- "...factoring out I/O, the primary determinant to server performance is the concurrency strategy."
- apache in this test - barfs at around 125 simultaneous users.
- At http://www.acme.com/software/thttpd/benchmarks.html
JAWS: Understanding High Performance Web Systems
- At http://www.cs.wustl.edu/~jxh/research/research.html

Click here for zip file with: Small, Medium and Large HTML test files

Click here for tar.Z file with: Small, Medium and Large HTML test files

c = Number of simultaneous users (Concurrency Level)
n = Number of request per user (the per user load)

LIGHT LOAD STATIC FILE (~1.5 kB file)

/usr/local/apache/bin/ab -n   10   -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  100   -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1000   -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 10000  -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 100000 -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 5000   -c 10 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  150   -c 150 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  500   -c 150 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1500   -c 150 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 5000   -c 150 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  250   -c 250 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  500   -c 250 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 2500   -c 250 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 5000   -c 250 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  300   -c 300 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n  500   -c 500 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1000   -c 500 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 5000   -c 500 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1000   -c 1000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 10000  -c 1000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1010   -c 1010 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1024   -c 1024 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1025   -c 1025 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1250   -c 1250 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 1500   -c 1500 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 2000   -c 2000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 20000  -c 2000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 5000   -c 5000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 50000  -c 5000 http://ccp14vig1.dl.ac.uk/small.html

/usr/local/apache/bin/ab -n 100000 -c 10000 http://ccp14vig1.dl.ac.uk/small.html

DECENT LOAD STATIC FILE (~140 kB file)

/usr/local/apache/bin/ab -n   10   -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  100   -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1000   -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 10000  -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 100000 -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 5000   -c 10 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  150   -c 150 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  500   -c 150 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1500   -c 150 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 5000   -c 150 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  250   -c 250 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  500   -c 250 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 2500   -c 250 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 5000   -c 250 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  300   -c 300 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n  500   -c 500 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1000   -c 500 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 5000   -c 500 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1000   -c 1000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 10000  -c 1000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1010   -c 1010 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1024   -c 1024 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1025   -c 1025 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1250   -c 1250 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 1500   -c 1500 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 2000   -c 2000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 20000  -c 2000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 5000   -c 5000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 50000  -c 5000 http://ccp14vig1.dl.ac.uk/medium.html

/usr/local/apache/bin/ab -n 100000 -c 10000 http://ccp14vig1.dl.ac.uk/medium.html


HEAVY LOAD STATIC FILE (~670 kB file)

/usr/local/apache/bin/ab -n   10   -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  100   -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1000   -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 10000  -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 100000 -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 5000   -c 10 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  150   -c 150 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  500   -c 150 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1500   -c 150 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 5000   -c 150 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  250   -c 250 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  500   -c 250 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 2500   -c 250 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 5000   -c 250 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  300   -c 300 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n  500   -c 500 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1000   -c 500 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 5000   -c 500 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1000   -c 1000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 10000  -c 1000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1010   -c 1010 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1024   -c 1024 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1025   -c 1025 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1250   -c 1250 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 1500   -c 1500 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 2000   -c 2000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 20000  -c 2000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 5000   -c 5000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 50000  -c 5000 http://ccp14vig1.dl.ac.uk/large.html

/usr/local/apache/bin/ab -n 100000 -c 10000 http://ccp14vig1.dl.ac.uk/large.html

[Apache, Redhat and FreeBSD comparison] | [Optimising FreeBSD for Apache and High Performance web serving]

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