測試機的記憶體是 512M，所以在 {$TOMCAT_HOME}/bin/catalina.sh 裡，預設值 JAVA_OPTS="-server -Xmx178m -Xms178m" 改成 JAVA_OPTS="-server -Xms320m -Xmx512m"。
當 java -server -Xmx512m -Xms512m 在 std1 測試
#ab -dSk -c100 -n100 http://itblog.eztravel.com.tw/
Server Software: Apache/2.0.54
Server Hostname: itblog.eztravel.com.tw
Server Port: 80
Document Path: /
Document Length: 42246 bytes
Concurrency Level: 100
Time taken for tests: 64.345 seconds
Complete requests: 100
Failed requests: 0
Broken pipe errors: 0
Keep-Alive requests: 0
Total transferred: 4575165 bytes
HTML transferred: 4542083 bytes
Requests per second: 1.55 [#/sec] (mean)
Time per request: 64345.00 [ms] (mean)
Time per request: 643.45 [ms] (mean, across all concurrent requests)
Transfer rate: 71.10 [Kbytes/sec] received
Connnection Times (ms)
| min | avg | max | |
| Connect: | 47 | 387 | 6245 |
| Processing: | 5631 | 28227 | 64073 |
| Total: | 5631 | 28615 | 64340 |
當 java -server -Xms320m -Xmx512m 在 std1 測試
#ab -dSk -c100 -n100 http://itblog.eztravel.com.tw/
Benchmarking itblog.eztravel.com.tw (be patient).....done
Server Software: Apache/2.0.54
Server Hostname: itblog.eztravel.com.tw
Server Port: 80
Document Path: /
Document Length: 453 bytes
Concurrency Level: 100
Time taken for tests: 6.380 seconds
Complete requests: 100
Failed requests: 0
Broken pipe errors: 0
Non-2xx responses: 102
Keep-Alive requests: 0
Total transferred: 71094 bytes
HTML transferred: 46206 bytes
Requests per second: 15.67 [#/sec] (mean)
Time per request: 6380.00 [ms] (mean)
Time per request: 63.80 [ms] (mean, across all concurrent requests)
Transfer rate: 11.14 [Kbytes/sec] received
Connnection Times (ms)
| min | avg | max | |
| Connect: | 125 | 317 | 1192 |
| Processing: | 588 | 3567 | 5393 |
| Total: | 588 | 3885 | 5712 |
參考資料：http://linux.vbird.org/linux_server/0360apache.php#apache_speed
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