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Logging and Performance Analysis

All requests to a www4mail server results in one or more log file entries. www4mail can update up to 10 different log files with varying formats. Log files generated by www4mail conform to the Common Log Format as used with the Apache Web Server. In fact, the default log file may be analyzed with tools capable of analyzing logs from the Apache Web Server. However, www4mail also supports the Apache LogFormat directive to generate custom log file syntax.

Useful statistics on usage and performance may be obtained from these logs. In the last two years we have seen that www4mail@wm.ictp.trieste.it has been useful for many people from many different countries (including developed countries like Italy, USA, and others). The load on this public (www4mail@wm.ictp.trieste.it) server is well over 5,000 hits per day (average of about 3.5 requests per minute); other servers with bigger bandwidth have numbers well above 10,000. Typical results per server for a six-month period are:

Total

Nov-'00

Dec-'00

Jan-'00

Feb-'01

Mar-'01

Apr-'01

Hits

130,514

165,846

142,753

167,322

182,629

178,947

Files

114,313

152,967

126,339

148,566

161,465

160,589

Pages

53,550

65,850

59,945

62,927

57,761

62,870

Visits

13,269

15,166

15,858

16,434

16,752

16,625

KBytes

7,571,921

10,156,970

8,074,002

9,458,001

10,906,507

11,767,136


Maximum

Nov-'00

Dec-'00

Jan-'00

Feb-'01

Mar-'01

Apr-'01

Hits per Hour

571

497

813

608

542

770

Hits per Day

7,662

7,015

8,195

7,789

8,642

7,480

Files per Day

7,011

6,554

6,634

7,014

8,074

6,908

Pages per Day

3,307

2,836

3,383

3,315

3,139

2,845

Visits per Day

1,101

837

1,260

1,220

1,164

1,109


Hits by Response Code

Nov-'00

Dec-'00

Jan-'00

Feb-'01

Mar-'01

Apr-'01

200-OK

114,313

152,967

126,339

148,566

161,465

160,589

204-No Content

1,187

355

493

733

900

560

400-Bad Request

2,933

3,027

2,730

3,084

3,646

3,852

401-Unauthorized

-

94

125

104

67

119

403-Forbidden

43

3,007

1,870

1,932

2,138

2,674

404-Not Found

1,827

1,223

2,742

1,624

3,709

3,744

405-Method Not Allowed

558

112

70

121

83

95

408-Request Timeout

1,198

1,334

449

3,606

4,496

2,876

413-Request Entity Too Large

232

312

258

314

477

488

500-Internal Server Error

3

5

5

6

7

9

503-Service Unavailable

3,295

386

713

5,141

3,813

1,208

504-Gateway Timeout

960

1,084

731

1,210

907

1,565


Note that "hits" could be translated to mean the number of requests delivered by the server, while "visits" indicate the number of (different) email messages received. Previous hardware upgrades of the www4mail@wm.ictp.trieste.it service have indicated that demand always rises to fill the available and added capacity. This is the most significant indicator of the utility and success of www4mail.

The performance reported by other www4mail servers available may vary daily. A useful overview of performances of various www4mail and other Web-by-email gateways exists at www.netservs.com/mrcool/stats.htm.

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