Executive Summary

This Certified Performance Report is for Compaq's ProLiant 2500 running the Windows NT Server 4.0 operating system and the Microsoft Internet Information Server 2.0 (IIS).

The WebStone 2.0.1 benchmark was used to test the system. The maximum number of connections per second attained for the system is shown in Figure 1 and the peak throughput in Mbits per second is shown in Figure 2. A table summarizing the peak performance follows Figure 2. The single processor in the ProLiant 2500 was utilized 100% at peak performance. Because there was spare network bandwidth at peak performance, these tests show the full capabilities of the ProLiant 2500.

Introduction

This Performance Report was commissioned by Compaq Computer Corporation to demonstrate the performance of their ProLiant 2500 server and to allow readers to compare the performance of the ProLiant 2500 with that of servers from other vendors. Two 100Base-TX network interfaces were used on the server in order to allow enough throughput to show the server's capabilities. In addition, the WebStone 2.0.1 run rules were extended to include runs with up to 600 client threads. Minor changes were made to the WebStone scripts to allow us to run client systems against two different network interfaces and to accommodate the different command syntax of the webclient program on the Windows NT client systems. WebStone code changes are given in Appendix 1.

Mindcraft's Certification

Mindcraft, Inc. conducted the performance tests described in this report between November 12 and November 16, 1996, in our laboratory in Palo Alto, California. Mindcraft used the WebStone 2.0.1 test suite to measure performance.

Mindcraft certifies that the results reported herein fairly represent the performance of Compaq's ProLiant 2500 computer running Microsoft's Internet Information Server 2.0 under Microsoft's Windows NT Server 4.0 operating system as measured by the WebStone 2.0.1 test suite. Our test results should be reproducible by others who use the same test lab configuration as well as the computer and software configurations and modifications documented in this report.

Performance Analysis

This analysis is based on the complete WebStone benchmark results for the ProLiant 2500.

The WebStone 2.0.1 benchmark stresses a system's networking ability in addition to other aspects of server performance. The best way to see if there is unused capacity on a server computer running WebStone is to look at the CPU utilization. It was 100% for all of the tests when the peak performance was attained. The maximum network bandwidth used was 97.4 Mbits/second. This is well below the maximum expected available bandwidth of 120 to 140 Mbits/second for two 100Base-TX Ethernets. Therefore, the networks did not limit the performance of the ProLiant 2500 in these tests.

Figure 3 below shows IIS's network throughput capability on a ProLiant 2500. The throughput is reasonably flat over the range of clients tested and for all the ISAPI and CGI access methods. However, the HTML access method shows a slight degradation at 600 clients, which indicates that the system (combination of the computer, Windows NT, and IIS) are starting to become overloaded.

The WebStone load that a server computer can support depends on four primary factors:

• The bandwidth of the networks available;
• The ability of the operating system to utilize the available network bandwidth;
• The ability of the operating system to maximize the CPU time available to the Web server; and
• The rate at which the Web server can process requests

There is a strong correlation between the number of connections/second a server can provide and the throughput (in Mbits/second) it exhibits. This can be seen by comparing the connections/second per client in Figure 4 below with the throughput in Figure 3. The connection rate dips at 600 clients just as the throughput does, indicating the system is becoming saturated.

Test Procedures and Test Suite Configuration

Test Procedures

Mindcraft followed the standard WebStone 2.0.1 run rules with the following extensions:

• In addition to the standard run from 10 to 100 clients, we also ran tests for 200 to 600 clients in order to show the capabilities of these systems.
• We modified the runbench and webmaster.c files to support clients running on Windows NT systems. Code changes are shown in Appendix 1.

The following basic set of procedures was used for performing these tests:

• The HTTP server was started automatically at boot time.
• For the HTML runs, the server log files were deleted after each run from 10 to 100 clients and after each run from 200 to 600 clients.
• All test runs were done with the server console idle (no user logged in).

Test Suite Configuration

Testing was controlled from a Ross Technology SPARCplug system running Solaris 2.5.1 and a webmaster binary compiled on that system using gcc. The webclient program was compiled on a Windows NT 4.0 Server system using Microsoft Visual C++ version 4.2. Minor changes were made to the WebStone scripts to allow us to run client systems against two different network interfaces and to accommodate the different command syntax of the webclient program on the Windows NT client systems. WebStone code changes are given in Appendix 1.

Test Data

The data files used for the static HTML testing were the default "Silicon Surf" fileset, distributed as filelist.standard with the WebStone 2.0.1 benchmark.

This static HTML fileset was designed to represent a real-world server load. It was designed based on analysis of the access logs of Silicon Graphics, Inc.'s external Web site, http://www.sgi.com. Netscape's analysis of logs from other commercial sites indicated that Silicon Surf access patterns were fairly typical for the Web when they were designed.

The Silicon Surf model targets the following characteristics:

• 93% of accessed files are smaller than 30 KB.
• Average accessed file is roughly 7 KB.

Configuration of the System Tested

Test Lab Configuration

In order to cause the Internet Information Server to use all available CPU cycles on the server computer system, we used four WebStone client systems. A fifth system served as the Webmaster, controlling the WebStone driver. The test lab network configuration used for this work is shown below:

The tests described in this report were performed on isolated LANs that were quiescent except for the test traffic.

Glossary

Clients

Number of processes or threads simultaneously requesting Web services from the server.

Connections per second

Average rate of creation and destruction of client/server connections.

Errors per second

Error rate for this run.

Latency

Average client wait for data to be returned.

Throughput

Average net data transfer rate, in megabits per second.

Appendix 1: Changes to Webstone 2.0.1 Source

The following output from diff illustrates our changes:

Changes to bin/runbench: Comment out rcp and rsh commands directed at the NT hosts, and change the generated webclient configuration file to specify the server name. This uses a facility that's built into the software, but isn't used by the standard version of the WebStone run scripts.

17c17
< [ -n "$DEBUG" ] && set +x



> [ -n "$DEBUG" ] && set -x
87,90c87,90
< for i in $CLIENTS
< do
<       $RCP $WEBSTONEROOT/bin/webclient $i:$TMPDIR #/usr/local/bin
< done



> #NT: for i in $CLIENTS
> #NT: do
> #NT:  $RCP $WEBSTONEROOT/bin/webclient $i:$TMPDIR #/usr/local/bin
> #NT: done
101c101
<     TIMESTAMP=`date +"%y%m%d_11/06/96M"`



>     TIMESTAMP=`date +"%y%m%d_%H%M"`
107,110c107,110
<     for client in $CLIENTS
<     do
<       $RSH $client "rm /tmp/webstone-debug*" > /dev/null 2>&1
<     done



> #NT:     for client in $CLIENTS
> #NT:     do
> #NT:       $RSH $client "rm /tmp/webstone-debug*" > /dev/null 2>&1
> #NT:     done
119a120,121
>        CLIENTNET=`expr $i : "(.*)\..*"`
>        SERVERNAME=$[Macro error: j6- dagger]]
.$[Macro error: j6- dagger]]

122,123c124,125
<       echo "$i $CLIENTACCOUNT $CLIENTPASSWORD `expr $CLIENTSPERHOST + 1`" 
<        >> $LOGDIR/config



>       echo "$i $CLIENTACCOUNT $CLIENTPASSWORD `expr $CLIENTSPERHOST + 1` 
>               $SERVERNAME"  >> $LOGDIR/config
126c128
<       echo "$i $CLIENTACCOUNT $CLIENTPASSWORD $CLIENTSPERHOST" 
---
>       echo "$i $CLIENTACCOUNT $CLIENTPASSWORD $CLIENTSPERHOST $SERVERNAME" 
135,140c137,142
<     for i in $CLIENTS localhost
<     do
<       $RSH $i "rm -f $TMPDIR/config $TMPDIR/`basename $FILELIST`"
<       $RCP $LOGDIR/config $i:$TMPDIR/config
<       $RCP $LOGDIR/`basename $FILELIST` $i:$TMPDIR/filelist
<     done



> #NT:    for i in $CLIENTS localhost
> #NT:    do
> #NT:      $RSH $i "rm -f $TMPDIR/config $TMPDIR/`basename $FILELIST`"
> #NT:      $RCP $LOGDIR/config $i:$TMPDIR/config
> #NT:      $RCP $LOGDIR/`basename $FILELIST` $i:$TMPDIR/filelist
> #NT:    done
145,149c147,151
<     $RSH $SERVER "$SERVERINFO" > $LOGDIR/hardware.$SERVER 2>&1
<     for i in $CLIENTS
<     do
<       $RSH $i "$CLIENTINFO" > $LOGDIR/hardware.$i 2>&1
<     done



> #NT:    $RSH $SERVER "$SERVERINFO" > $LOGDIR/hardware.$SERVER 2>&1
> #NT:    for i in $CLIENTS
> #NT:    do
> #NT:      $RSH $i "$CLIENTINFO" > $LOGDIR/hardware.$i 2>&1
> #NT:    done
151,156c153,156
<     set -x
<     for i in $OSTUNINGFILES $WEBSERVERTUNINGFILES
<     do
<       $RCP $SERVER:$i $LOGDIR
<     done
<     set +x



> #NT:    for i in $OSTUNINGFILES $WEBSERVERTUNINGFILES
> #NT:    do
> #NT:      $RCP $SERVER:$i $LOGDIR
> #NT:    done
162,164c162,166
<     CMD="$WEBSTONEROOT/bin/webmaster -v -u  $TMPDIR/filelist"
<     CMD=$CMD" -f $TMPDIR/config -t $TIMEPERRUN"
<     [ -n "$SERVER" ] && CMD=$CMD" -w $SERVER"



>     #GREG: bug fix: changed $TMPDIR below to $LOGDIR
>     CMD="$WEBSTONEROOT/bin/webmaster -v -W -u $LOGDIR/filelist"
>     #GREG: bug fix: changed $TMPDIR below to $LOGDIR
>     CMD=$CMD" -f $LOGDIR/config -t $TIMEPERRUN"
>     #GREG: [ -n "$SERVER" ] && CMD=$CMD" -w $SERVER"
    
Changes to sysdep.h: Emit an NT-style command line and to fix a C
    portability problem. 

   48c48
< #error  NT gettimeofday() doesn't support USE_TIMEZONE (yet)



> #error  NT gettimeofday() does not support USE_TIMEZONE (yet)
87a88
> #ifdef SOLARIS_CLIENT
88a90,92
> #else
> #define PROGPATH "D:\webstone2.0\webclient.exe" /* "/usr/local/bin/webclient" */
> #endif /* SOLARIS_CLIENT */

   Changes to webmaster.c: Emit an NT-style command line, and fix a bug that
    shows up on Solaris. 
    
539a540
> #ifdef SOLARIS_CLIENT
550a552
> #endif /* SOLARIS_CLIENT */
586a589
> #ifdef SOLARIS_CLIENT
588a592,594
> #else
>         strcat(commandline, " -u d:\WebStone2.0\filelist");
> #endif /* SOLARIS_CLIENT */
1395a1402
> 
1398a1406,1408
>       size_t count;
>       char **sptr, **dptr;
>       struct in_addr *iptr;
1406,1407d1415
<       dest->h_addr_list = src->h_addr_list;
< }
1408a1417,1446
>       /*
>        * ADDED: by Greg Burrell of Mindcraft Inc. 10/22/96
>        * PROBLEM: we can't just do the assignment:
>        *
>        *              dest->h_addr_list = src->h_addr_list
>        *
>        *     because those are just pointers and the memory pointed to
>        *     may get overwritten during the next gethostbyname() call.  
>        *     In fact, that happens on Solaris 2.5
>        *
>        * FIX: Make a copy of the h_addr_list of a hostent structure.
>        *     h_addr_list is really an array of pointers.  Each pointer 
>        *     points to a structure of type in_addr.  So, we allocate space 
>        *     for the structures and then allocate space for the array of 
>        *     pointers.  Then we fill in the structures and set up the array 
>        *     of pointers.
>        */
>       for(count = 0, sptr = src->h_addr_list; *sptr != NULL; sptr++, count++);
>       if ((dest->h_addr_list = malloc(count + 1)) == NULL)
>               return 0;
>       if ((iptr = malloc(count * sizeof(struct in_addr))) == NULL)
>               return 0;
>       for (sptr = src->h_addr_list, dptr = dest->h_addr_list; 
>                       *sptr != NULL; sptr++, dptr++, iptr++) [Macro error: j6- dagger]]

>       *dptr = NULL;
>       return 1;
> }

HKEY_LOCAL_MACHINE SYSTEM 
       CurrentControlSet 
          Services 
             InetInfo 
                Parameters
                   ListenBacklog: 1024

HKEY_LOCAL_MACHINE SYSTEM 
       CurrentControlSet 
          Services 
             Tcpip 
                Parameters
                   TcpTimedWaitDelay: 1

HKEY_LOCAL_MACHINE
    SYSTEM
        CurrentControlSet
            Services
               cpqnf30
                  Parameters
                     MaxReceives: 500