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Category Archives: Hardware
C++ 與組語的速度...
在 Hacker News Daily 上看到「Why is this C++ code faster than my hand-written assembly for testing the Collatz conjecture?」覺得很有趣... 作者寫了一段 assembly，但跑起來比用 C++ 同義的版本慢多了。目前最高分的答案給了很清楚的解釋... even: mov rbx, 2 xor rdx, rdx div rbx 上面這段 code 是作者寫的組語版本，用到 div 指令，這是非常慢的指令： On Intel Haswell, … Continue reading
Posted in Computer, Hardware, Murmuring, Programming
Tagged assembly, c, cpu, div, optimization, performance, shr, speed, x86
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AWS CloudHSM 支援 FIPS 140-2 Level 3 了
AWS CloudHSM 推出了一些新功能：「AWS CloudHSM Update – Cost Effective Hardware Key Management at Cloud Scale for Sensitive & Regulated Workloads」。 其中比較特別的是從以前只支援 Level 2 變成支援 Level 3 了： More Secure – CloudHSM Classic (the original model) supports the generation and use of … Continue reading
加州的手機防竊提案讓失竊率下降不少...
2013 的時候提過「加州的手機防竊提案...」，後來在 2015 年生效： In a press release sent to reporters on Thursday, George Gascón said that since the law went into effect on July 1, 2015[,] 在兩大陣營都有類似的功能： Such a kill switch has become standard in all iPhones ("Activation Lock") … Continue reading
在 Ubuntu 下列印：用 ACCOUNTNUMBER 解決用戶號碼的問題...
因為要處理帳務的關係，公司的印表機需要設定帶出設定用戶號碼 (其實是部門編號) 才有辦法列印。 這點在 Windows 下不是問題，但在 Ubuntu 下就頭痛了... 今天總算是花時間去找方法在 Ubuntu 上直接列印了。(以前都是自暴自棄開 Windows VM 印文件...) 解法是在「Printer Job Options for User Accounts」這邊翻到的。 裡面有人提到，先去官網上下載 ppd 檔 (有可能是 .gz 的形式，如果是的話就改完再壓回去)，然後找到 %== constraints 的地方，在前面加上： *% **** Account number *JCLOpenUI *JCLMXaccount/numero: PickOne *OrderDependency: 80 JCLSetup *JCLMXaccount … Continue reading
Ubuntu 下雙螢幕進入省電模式後再起不能的問題
Update：後來還是有狀況，這篇的方法沒有完全解決... 等找出解法後再回來更新。 前陣子把家裡的 Ubuntu 桌機多塞了一顆 Dell 的 P2317H，打直拿來看程式碼，大致上是沒什麼問題，不過螢幕進入省電模式後就再起不能... (NVIDIA 的顯卡，一顆接 DisplayPort，另外一顆接 HDMI) 後來找到這一串討論：「DP1.2 connected monitor cannot be turned on again with DPMS」。 這串討論裡官方的人有給不少方式，後來試到第二頁的發法，是在 /etc/modprobe.d/disable-nouveau.conf 裡設定一些參數，重開機後就解決了： blacklist nouveau options nouveau modeset=0 看起來是 nouveau 的關係，現在總算是可以比較正常的使用了... (還有不少眉眉角角的地方要再找方法解...)
Amazon EC2 推出新的 GPU 系列機器
這次 Amazon EC2 推出了 G3 instance：「New – Next-Generation GPU-Powered EC2 Instances (G3)」。 這次開放的只有這幾區，亞洲目前還沒有在內： You can launch these instances today in the US East (Ohio), US East (Northern Virginia), US West (Oregon), US West (Northern California), AWS GovCloud (US), and EU … Continue reading
DigitalOcean 推出 High CPU Droplets
DigitalOcean 推出了高 CPU 使用量的 VPS 服務：「Introducing High CPU Droplets」。 價位從 USD$40/month 開始。相較於 Standard Droplet，CPU 的速度提升到 2.5 倍速 (平均)： The current CPUs powering High CPU Droplets are the Intel Broadwell 2697Av4 with a clock speed of 2.6Ghz, and the Intel Skylake … Continue reading
Posted in Computer, Hardware, Murmuring, Network, Service
Tagged cpu, digitalocean, droplet, high, hosting, performance, speed, vps
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Netflix 對於拍攝影片的要求
Netflix 對於拍攝影片的要求直接放在網站上：「Production and Post-Production Requirements v2.1」。 Provide a set of technical requirements for production and post-production workflows to ensure that a high level of quality is maintained throughout the lifecycle of a project from capture to archive. This serves the … Continue reading
Posted in Computer, Hardware, Movie, Murmuring, Recreation, Television
Tagged 4k, camera, netflix, production, requirement, resolution, video
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手機上用 FPGA 的想法...
在「Apps with hardware: enabling run-time architectural customization in smart phones」這邊看到去年就有論文在討論在手機上使用 FPGA 的想法... 的確現在 FPGA 的價錢其實是蠻平價的了... 除了透過 GPU 加速外，FPGA 聽起來也是個不錯的方向 @_@ 最直接的例子就是 AES 運算來看，可以看到比現在最快的實做快了半個數量級，大約三倍？(跟支援硬體加速的 OpenSSL 比，看格子大約是半格，也就是 100.5，約 3.16 倍)。 而如果是純軟體的應用，有些會差到四個數量級... (萬？)
EC2 的 P2 系列 (NVIDIA Tesla K80) 在東京開放使用了
Amazon EC2 把 P2 instance 的設備準備好了，在東京與雪梨開放使用了：「Amazon EC2 P2 Instances are now available in Asia Pacific (Tokyo) and Asia Pacific (Sydney) Regions」。 P2 instance 使用的是 NVIDIA Tesla K80，大約是兩年多前推出的架構，大概是一連串的計畫吧...