apache的ab的用法是（用tomcat裡的ab.exe來測試）：（需要進到目錄/usr/bin/目錄裡）
ab常用引數的介紹：
-n ：總共的請求執行數，預設是1
-c： 併發數，預設是1
-t：測試所進行的總時間，秒為單位，預設50000s
-p：post時的資料檔案
-w: 以html表的格式輸出結果[root@localhost bin]# ./ab
我用xshell開了2個視窗（乙個用ab，乙個用node dome.js）
[root@localhost bin]# ./ab -n 1000 -c 10
this is apachebench, version 2.3
licensed to the apache software foundation,
benchmarking 192.168.100.50 (be patient)
completed 100 requests
completed 200 requests
completed 300 requests
completed 400 requests
completed 500 requests
completed 600 requests
completed 700 requests
completed 800 requests
completed 900 requests
completed 1000 requests
finished 1000 requests
server software:
server hostname: 192.168.100.50
server port: 2017
document path: /
document length: 12 bytes
concurrency level: 10
time taken for tests: 0.399 seconds
complete requests: 1000
failed requests: 0
write errors: 0
total transferred: 113000 bytes
html transferred: 12000 bytes
requests per second: 2508.74 [#/sec] (mean)
time per request: 3.986 [ms] (mean)
time per request: 0.399 [ms] (mean, across all concurrent requests)
transfer rate: 276.84 [kbytes/sec] received
connection times (ms)
min mean[+/-sd] median max
connect: 0 0 0.3 0 7
processing: 0 4 4.5 2 38
waiting: 0 4 4.5 2 38
total: 1 4 4.5 2 38
percentage of the requests served within a certain time (ms)
50% 2
66% 3
75% 4
80% 5
90% 7
95% 11
98% 19
99% 35
100% 38 (longest request)
[root@localhost bin]#
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