這次測試的環境是
- 檔案大小：682.3MB
- Android 用戶端硬體：小米手機3
- 伺服器的硬體：macbook pro 2015, OS X 10.12.3
- 路由器：小米路由
手機的執行畫面如下：
首先測試區塊大小是 1MB 的情況下，Android 輸出的Log:
- 02-22 15:07:55.901 23790-23976/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:11:29.899 23790-23976/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
Dropboxlike-Server 的執行畫面：
說明：左邊紅框，可以看到檔案的每一個offset 間格 1MB, 右邊看到每一個 request 需要花 140 ～200ms.
- Session Size=1MB
- Spent Time=3分34秒
- request buffer size=default.
測完 1MB, 直接加一個數字0 測看看 10MB, Andriod Log:
- 02-22 15:13:42.337 30685-30954/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:15:57.548 30685-30954/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
Dropboxlike-Server 的執行畫面：
Session Size=10MB
Spent Time=2分15秒
request buffer size=default.
接著，測試看看 20MB, 程式會掛掉，調整了 request.bufferSize 參數為 1KB, 還是一樣會掛掉，可能是跟 20MB無緣，再測試看看 10MB, 再加上 request.bufferSize=1024, Android Log:
- 02-22 15:19:33.223 5060-5280/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:22:00.859 5060-5280/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
測完結果，慢了12秒：
- Session Size=10MB
- Spent Time=2分27秒
- req buffer size=1K
所以，後面的測試都不加 bufferSize 使用 request 裡預設值，預設值是什麼，我也不清楚，我是「囫圇吞棗」&「不求甚解」的愛好者，這問題自動跳過。
測看看 4MB
- 02-22 15:28:19.632 13246-13375/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:30:31.248 13246-13375/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
Dropboxlike-Server 的執行畫面：
說明：一個server side request 大需需要 600ms 左右。原本以為 10MB 是最佳的大小，因為減少了與伺服器間斷線還有重新連線的封包，沒想到 4MB整體效能比10MB好。
- Session Size=4MB
- Spent Time=2分12秒
- request buffer size=default.
- 每秒傳送速度 5.17MB/Sec
測試看看 6MB, 預期應該會比 4MB 好：
- 02-22 15:34:49.249 13246-13447/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:37:02.646 13246-13447/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
Dropboxlike-Server 的執行畫面：
說明：一個server side request 大約需要 1秒。測試結果整體效能和4MB一樣。
- Session Size=6MB
- Spent Time=2分13秒
- request buffer size=default.
測試 3MB:
- 02-22 15:39:20.324 25932-26183/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:41:34.928 25932-26183/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
結果和4MB 差不多，但比 4MB 慢了2秒多，差異不大：
- Session Size=3MB
- Spent Time=2分14秒
- request buffer size=default.
測試看看 2MB:
- 02-22 15:44:34.124 32244-32418/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionStart POST: https://192.168.31.70:80/1/files/upload_session/start
- 02-22 15:46:52.743 32244-32418/com.lwfd.dropboxlike D/SeafConnection: getUploadSessionFinish POST: https://192.168.31.70:80/1/files/upload_session/finish
結果和4MB 差不多，但比 4MB 慢了6秒，差異不大：
- Session Size=2MB
- Spent Time=2分18秒
- request buffer size=default.