[推薦文章]Top 10 Performance Mistakes/十大性能方面的错误

英文原文傳送門：https://www.infoq.com/articles/top-10-performance-mistakes

簡體中文傳送門：http://www.infoq.com/cn/articles/top-10-performance-mistakes

摘要：
10. Not Upgrading.
9. Duplicated Work.
8. Data Dependent Loads.
7. Too Much Allocation.
6. Going Parallel
5. Not Understanding TCP.
4. Synchronous Communications
3. Text Encoding.
2. API Design
1. Logging

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Performance tuning 第一要務：找到 bottleneck

找 bottleneck 第一要務：資訊充足、避免黑箱。但如果為了資訊充足插了一堆 log, 你又中了第一個最常見的 performance 問題：Logging。
--
挑幾個來提我的經驗：

10. 不升級：有很多人用很舊的 OS 版本、DBMS 版本、framework 版本，本質上就是老牛拖慢車，車殼改造地再流線來降低風阻，引擎沒升級就是慢。

9. 不必要的重複的工作：這邊講的例子是不恰當地使用ORM。以 Entity Framework 當例子，請參考之前整理的討論串：https://www.facebook.com/91agile/posts/571836689657620

8. 使用錯誤的資料結構：不是只要放到 memory 就沒有存取效能的問題，各種資料結構在面對不同的存取操作時，Big O還是要參考一下，選擇最恰當的資料結構才會事半功倍。

7. GC 在回收 large object heap 時，是需要比較多時間的。(.NET 中 large object 指大於 85,000 bytes 的物件)

6. 濫用 Parallel: 只有1間廁所，有10個人在排隊，你排一隊搞不好還比排 10 隊來得快上不少。（通常廁所就是你的DB）

4. 同步處理的問題：同步就要等，非同步就要解決一致性問題、通知問題。在通訊上，請考慮是否使用 NIO 框架，如 Netty: http://mp.weixin.qq.com/s…

3. 序列化/反序列化：有時為了讓人看懂，就會使用序列化的技巧。但不必要用、濫用就會很吃CPU。

1. Logging：Log 一定要分類分級，而且一定要統一設定就可以進行各類各級的開關。在應付大量 request/transaction 時，能省掉的開銷都要省掉。

#performance

Checking out Taiwan International Photography and Media Equipment Exhibition on my quest of upgrading my camera! Also showing you the Taiwan Outdoor Trade Show and preparing for an upcoming camping trip?!

Thanks again Merry Go Round for your support and for lending me an even better camera than my precious Canon M50, which by the way now is back from repair at Canon! If you ever are in need of renting camera gear in Taipei, you should definitely check these guys out - https://www.mgrstore.net/

Special thanks to STC for helping me out with their awesome lenses (FYI - this video NOT sponsored. But they did help me out with lenses in the past!)
STC website：https://stcoptics.com/en/
STC Facebook：https://www.facebook.com/STCOptics/?ref=aymt_homepage_panel&eid=ARDhS-fGTg5dCPEl3HsssPnUn6wu7pYBBjEsTZGpTdaAd-jp41-FBc7bPwJkCUR_pra5Oxq7QhC4q7dt

CPL：https://stcoptics.com/en/shvcpl/

VND：https://stcoptics.com/en/vnd/

ICELAVA：https://stcoptics.com/en/icelava/

E-shop：https://shop.stcoptics.com/

Business inquiries:
中文/English
創作者經紀人/Contact person: - Maggie
Line ID: @rog8149u
Email: lukas@ruredi.co

Want to see photos from our adventures before everyone else and/or suggest what I should check out next?!

Please follow me on:
Facebook: www.facebook.com/LukasTaiwan
Instagram: www.instagram.com/LukasEngstrom

The following is the gear I’m using when making my videos. I’m part of Amazon Services LLC Associates Program which means that I will get a small commission if you purchase anything via my links. Any commission I’ll be getting will go straight back into buying new gear for my future videos, so any sort of support is highly appreciated!

MAIN GEAR:
Camera: Canon EOS R: https://amzn.to/2CAybbh
Lens: Canon RF 24-70mm F2.8 L IS USM: https://amzn.to/34RDy1V
Insta360 One X: https://amzn.to/2KfwBjd
Tripod: JOBY GorillaPod 5K Kit: https://amzn.to/36VxMhy
Microphone: RØDE VideoMic Pro+: https://amzn.to/2Tg9mbx
Drone: DJI Mavic 2 Zoom: https://amzn.to/2Sak4CX
Mavic 2 Fly More Kit: https://amzn.to/2TlpLLT
Gimbal: DJI Ronin-S Handheld 3-Axis Gimbal:https://amzn.to/2NG4L20
2x SanDisk Extreme Pro Memory Card (128GB): https://amzn.to/2Oi0CQX
Bag: Lowepro ProTactic BP 450 AW II:https://amzn.to/2NDbCsN

BACK-UP GEAR:
Camera: Canon M50: https://amzn.to/2Tf998r
Lens: Canon EF 24mm f/1.4L II USM: https://amzn.to/2O0a62Y
Lens: Canon EF 50mm f/1.8 STM https://amzn.to/2O5DJA0
Lens: Canon EF-S 10-18mm f/4.5-5.6 IS STM: https://amzn.to/2X88oR7
Canon EOS M Mount Adapter: https://amzn.to/2O1jH9I
Canon EF-EOS R Mount Adapter: https://amzn.to/2NDak0V
JOBY Gorillapod 3K: https://amzn.to/2S3GQfR

OTHER GEAR:
ADATA SD600Q SSD (240GB): https://amzn.to/2Wp28Tf
ADATA D8000L LED Power Bank: https://amzn.to/34MrlLY
Transcend ESD240C Portable SSD (480GB): https://amzn.to/2X5L7xW
Transcend ESD350C Portable SSD (480GB): https://amzn.to/32LBzeg
Transcend StoreJet 25MC HDD (1TB): https://amzn.to/2KekmUd
Transcend 128GB microSD: https://amzn.to/2tCkOmw
MacBook Pro 15” - TouchBar: https://amzn.to/2p7rSsy
Asus VP28UQG 28" 4K/UHD monitor: https://amzn.to/2CE5eeI

Special thanks to STC for helping me out with filters:
STC website：https://stcoptics.com/en/
STC Facebook：https://www.facebook.com/STCOptics/
CPL：https://stcoptics.com/en/shvcpl/
VND：https://stcoptics.com/en/vnd/
ICELAVA：https://stcoptics.com/en/icelava/
E-shop：https://shop.stcoptics.com/

In this video, I am sharing my tips and tricks on how I saved over $10 000 NTD (~ $326 USD) while upgrading my camera equipment!
We also check out Jian Dao Shi which is a steep hike in Neihu District, with a fantastic view over downtown Taipei!

Business inquiries:
中文/English
創作者經紀人/Contact person: - Maggie
Line ID: @rog8149u
Email: lukas@ruredi.co

Want to see photos from our adventures before everyone else and/or suggest what I should check out next?!

Please follow me on:
Facebook: www.facebook.com/LukasTaiwan
Instagram: www.instagram.com/LukasEngstrom

The following is the gear I’m using when making my videos. I’m part of Amazon Services LLC Associates Program which means that I will get a small commission if you purchase anything via my links. Any commission I’ll be getting will go straight back into buying new gear for my future videos, so any sort of support is highly appreciated!

MAIN GEAR:
Camera: Canon EOS R: https://amzn.to/2CAybbh
Lens: Canon RF 24-70mm F2.8 L IS USM: https://amzn.to/34RDy1V
Insta360 One X: https://amzn.to/2KfwBjd
Tripod: JOBY GorillaPod 5K Kit: https://amzn.to/36VxMhy
Microphone: RØDE VideoMic Pro+: https://amzn.to/2Tg9mbx
Drone: DJI Mavic 2 Zoom: https://amzn.to/2Sak4CX
Mavic 2 Fly More Kit: https://amzn.to/2TlpLLT
Gimbal: DJI Ronin-S Handheld 3-Axis Gimbal:https://amzn.to/2NG4L20
2x SanDisk Extreme Pro Memory Card (128GB): https://amzn.to/2Oi0CQX
Bag: Lowepro ProTactic BP 450 AW II:https://amzn.to/2NDbCsN

BACK-UP GEAR:
Camera: Canon M50: https://amzn.to/2Tf998r
Lens: Canon EF 24mm f/1.4L II USM: https://amzn.to/2O0a62Y
Lens: Canon EF 50mm f/1.8 STM https://amzn.to/2O5DJA0
Lens: Canon EF-S 10-18mm f/4.5-5.6 IS STM: https://amzn.to/2X88oR7
Canon EOS M Mount Adapter: https://amzn.to/2O1jH9I
Canon EF-EOS R Mount Adapter: https://amzn.to/2NDak0V
JOBY Gorillapod 3K: https://amzn.to/2S3GQfR

OTHER GEAR:
ADATA SD600Q SSD (240GB): https://amzn.to/2Wp28Tf
ADATA D8000L LED Power Bank: https://amzn.to/34MrlLY
Transcend ESD240C Portable SSD (480GB): https://amzn.to/2X5L7xW
Transcend ESD350C Portable SSD (480GB): https://amzn.to/32LBzeg
Transcend StoreJet 25MC HDD (1TB): https://amzn.to/2KekmUd
Transcend 128GB microSD: https://amzn.to/2tCkOmw
MacBook Pro 15” - TouchBar: https://amzn.to/2p7rSsy
Asus VP28UQG 28" 4K/UHD monitor: https://amzn.to/2CE5eeI

Special thanks to STC for helping me out with filters:
STC website：https://stcoptics.com/en/
STC Facebook：https://www.facebook.com/STCOptics/
CPL：https://stcoptics.com/en/shvcpl/
VND：https://stcoptics.com/en/vnd/
ICELAVA：https://stcoptics.com/en/icelava/
E-shop：https://shop.stcoptics.com/

This weekend, I'm traveling down to Kaohsiung to meet a new friend, and the world's TALLEST bronze Buddha statue!

While Wes is focusing more on the statue and the huge monastery Fo Guang Shan, I am more focused on his camera equipment and will consider upgrading my stuff really soon!

Do yourself a favor and check out the entire video so you don't miss out on the awesome drone shots. THE best drone shots I've ever seen in a Lukas Engstrom production!

Wes’ video: https://youtu.be/0omZaPrlPfs

Business inquiries:
中文/English
創作者經紀人/Contact person: - Maggie
Line ID: @rog8149u
Email: lukas@ruredi.co

Want to see photos from our adventures before everyone else and/or suggest what I should check out next?!

Please follow me on:
Facebook: www.facebook.com/LukasTaiwan
Instagram: www.instagram.com/LukasEngstrom

The following is the gear I’m using when making my videos. I’m part of Amazon Services LLC Associates Program which means that I will get a small commission if you purchase anything via my links. Any commission I’ll be getting will go straight back into buying new gear for my future videos, so any sort of support is highly appreciated!

MAIN GEAR:
Camera: Canon EOS R: https://amzn.to/2CAybbh
Lens: Canon RF 24-70mm F2.8 L IS USM: https://amzn.to/34RDy1V
Insta360 One X: https://amzn.to/2KfwBjd
Tripod: JOBY GorillaPod 5K Kit: https://amzn.to/36VxMhy
Microphone: RØDE VideoMic Pro+: https://amzn.to/2Tg9mbx
Drone: DJI Mavic 2 Zoom: https://amzn.to/2Sak4CX
Mavic 2 Fly More Kit: https://amzn.to/2TlpLLT
Gimbal: DJI Ronin-S Handheld 3-Axis Gimbal:https://amzn.to/2NG4L20
2x SanDisk Extreme Pro Memory Card (128GB): https://amzn.to/2Oi0CQX
Bag: Lowepro ProTactic BP 450 AW II:https://amzn.to/2NDbCsN

BACK-UP GEAR:
Camera: Canon M50: https://amzn.to/2Tf998r
Lens: Canon EF 24mm f/1.4L II USM: https://amzn.to/2O0a62Y
Lens: Canon EF 50mm f/1.8 STM https://amzn.to/2O5DJA0
Lens: Canon EF-S 10-18mm f/4.5-5.6 IS STM: https://amzn.to/2X88oR7
Canon EOS M Mount Adapter: https://amzn.to/2O1jH9I
Canon EF-EOS R Mount Adapter: https://amzn.to/2NDak0V
JOBY Gorillapod 3K: https://amzn.to/2S3GQfR

OTHER GEAR:
ADATA SD600Q SSD (240GB): https://amzn.to/2Wp28Tf
ADATA D8000L LED Power Bank: https://amzn.to/34MrlLY
Transcend ESD240C Portable SSD (480GB): https://amzn.to/2X5L7xW
Transcend ESD350C Portable SSD (480GB): https://amzn.to/32LBzeg
Transcend StoreJet 25MC HDD (1TB): https://amzn.to/2KekmUd
Transcend 128GB microSD: https://amzn.to/2tCkOmw
MacBook Pro 15” - TouchBar: https://amzn.to/2p7rSsy
Asus VP28UQG 28" 4K/UHD monitor: https://amzn.to/2CE5eeI

Special thanks to STC for helping me out with filters:
STC website：https://stcoptics.com/en/
STC Facebook：https://www.facebook.com/STCOptics/
CPL：https://stcoptics.com/en/shvcpl/
VND：https://stcoptics.com/en/vnd/
ICELAVA：https://stcoptics.com/en/icelava/
E-shop：https://shop.stcoptics.com/