Monthly Archives: November 2016

電信商對 Zero Rating 與網路中立性的問題

在「AT&T users will be able to stream DirecTV Now without using their data」這邊才看到 FCC 在這個月月初針對電信商對特定服務的 zero rating 發出警告:「The FCC tells AT&T it may be violating net neutrality with its DirecTV plans」: AT&T is far from the only US carrier to … Continue reading

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保護 macOS 的方法

在「drduh/macOS-Security-and-Privacy-Guide」這邊列出了許多保護方式,如果考慮到 APT 的話應該是個不錯的指南... 不過考慮到相當硬,服用前請小心,有些步驟甚至需要拆機: 雖然整篇文章還頗硬的,但裡面講軟體的部份還是很不錯的指南,可以保護自己...

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MyRocks 與 InnoDB 對於不同硬碟效能的差異

在「MyRocks: use less IO on writes to have more IO for reads」這邊有提到當使用 Disk Array、Slow SSD 與 Fast SSD 時效能 MyRocks 與 InnoDB 的效能差異。 可以看到當 I/O 層能提供的 IOPS capacity 愈高,MyRocks 與 InnoDB 之間的差異就愈低... 換句話說,RocksDB 對 IOPS 比較有效率的應用,這點在「Why is MyRocks more write-efficient … Continue reading

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InnoDB 的 Isolation Level 以及 Performance Schema 對效能的影響

雖然 Mark Callaghan 現在的主力都在 MyRocks 上,但他還是對 InnoDB 上的效能頗關注 (畢竟是個成熟而且競爭的產品)。而這篇「Sysbench, InnoDB, transaction isolation and the performance schema」講到 MySQL 5.6.26 裡的 InnoDB,了解 isolation level 與 performance schema 對效能的差異。結果可以在這邊翻到。 關掉 performance schema 會讓效能變好是預期的,不過看起來比預期小很多。另外某些情況下 RR (REPEATABLE-READ) 的效能會比 RC (READ-COMMITTED) 好倒是頗意外,這邊也有給出原因: Using repeatable-read boosts performance … Continue reading

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Amazon SQS 支援 FIFO 了

Amazon SQS 支援 FIFO 了:「FIFO (First-In-First-Out) Queues」。新的 FIFO Queue 有保證順序,但也因此效能上有限制: In addition to having all the capabilities of the standard queue, FIFO (First-In-First-Out) queues are designed to enhance messaging between applications when the order of operations and events is critical, … Continue reading

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Amazon Aurora 支援 t2.medium...

Amazon Aurora 宣佈支援 t2.medium:「Use Amazon Aurora for Dev & Test Workloads with new T2.Medium DB Instance Class」。 雖然官方的文章標題是寫提供給 dev & test 情境下使用,但其實對於某些 production 應該也不錯: The db.t2.medium should be a great fit for many of your development and test scenarios, and … Continue reading

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Dropbox 在全球建機房加速...

Dropbox 為了加速傳輸,在全球到處建機房降低 latency:「Infrastructure Update: Pushing the edges of our global performance」。 就他們測試發現,透過 proxy server 降低 latency 的效果很不錯: We’ve tested and applied this configuration in various markets in Europe and Asia. In France, for example, median download speeds are 40% faster … Continue reading

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Amazon S3 與 Glacier 的降價...

這次 AWS 對 storage 類調降了不少幅度,包括了 S3 與 Glacier:「AWS Storage Update – S3 & Glacier Price Reductions + Additional Retrieval Options for Glacier」。 S3 的部份降幅都不算低,要注意的是這次是 2016/12/01 開始,並沒有回朔: We are reducing the per-GB price for S3 Standard Storage in most AWS regions, … Continue reading

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Amazon SES 的固定 IP 服務

怎麼這麼多消息啊... 這次是 Amazon SES 宣佈提供固定 IP 服務:「Amazon SES Now Offers Dedicated IP Addresses」。 這樣可以減少被其他人影響到 reputation,提昇穩定度: Amazon Simple Email Service (Amazon SES) now offers dedicated IP addresses, which enable you to manage the reputation of the IP addresses that Amazon SES … Continue reading

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Linode 東京二號機房開幕

大家等 Linode 的東京新機房很久了,總算是開了:「New Linode Datacenter: Tokyo 2」。 在 comment 有特別提到東京一號機房不會擴充: Tokyo 1 is at capacity and we have no plans to add any additional. You will need to move out of Tokyo 1 for plan upgrades, KVM, newest hardware, and … Continue reading

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