在 Ubuntu (Xfce) 上改用 Albert Launcher

在噗浪上的這篇看到的工具,讓我想起來之前有想要在 Ubuntu + Xfce 上找類似的工具:

macOS 上我最常用的就是計算機與匯率換算,另外就是開應用程式。

但是因為沒辦法直接用 super key 啟動 (也稱作 meta key,或是大家更熟悉的微軟鍵),所以得迂迴設定,先透過 xcape 把左邊的 super key 對應到 Ctrl-Esc 上:

xcape -e 'Super_L=Control_L|Escape'

然後把本來的 Ctrl-Esc 拔掉:

然後這時候用 super key 時就會改抓到 Ctrl-Esc 了:

接下來就可以勾選 extensions 了,這邊勾了幾個:

然後 Python 這邊把 Currency convert 的部份勾起來:

用法是 1 usd to twd 這樣的句子:


幾個其他 Teams 的替代方案 (但還是連到 Teams 伺服器)

這邊講的替代方案不是換掉 Teams,而是找其他的方法連上 Teams 伺服器,畢竟用 Teams 的人大多都沒得選...

在「Teams is killing my Mac every day (microsoft.com)」這邊看到的一些資料可以嘗試,裡面有很多抱怨 Teams 的問題,但還是有些人有給出一些 workaround。

大家主要遇到的問題除了 CPU 吃很兇以外,另外就是記憶體這塊。

一種方法是是用 Edge 瀏覽器的 extension 來跑,我本來想看看 Linux 上的 Brave 能不能裝,但沒有看到對應的安裝連結,大概是 Edge 限定:

If you don't want to use the Microsoft Teams app (which uses a lot of resources), you can:

1. Install the Microsoft Edge Web browser on your Mac

2. Log into https://teams.microsoft.com

3. Click ... > Apps > Install this site as an app

This will create an Edge app for Teams that uses almost no resources but has feature parity with the regular Microsoft Teams app.

We tell all of our students to do this, and it has solved all Microsoft Teams performance issues on student Macs (both Intel and Apple Silicon).

另外有人提到其實官方是有放 M1 的 preview 版本的,雖然不是正式版,但總是比 Intel 版本會好一些:

If you're running an Apple Silicon Mac you can get an early build of Teams osx-arm64 from the exploration build link listed here.[0]

I've been running a daily build for a few weeks and it's noticeably better than the Intel build on an M1 Pro. It launches in half the time and feels far more responsive (probably due to not needing to use the Rosetta JIT for Electron). That said it's still a daily "exploration" build so YMMV.

[0] https://raw.githubusercontent.com/ItzLevvie/MicrosoftTeams-msinternal/master/defconfig


Can confirm it is snappier on a M1 Macbook Pro and using *less* RAM, maybe about 10% less.

但據說這個 preview 版本在自我更新時會跳到 Intel 版本,還要再找一下 workaround 關掉自動更新:

How do you prevent it from automatically updating to the Intel version? I keep downloading the preview builds and they keep getting updated.

後面還有看到有人說他直接實體隔離,把這些肥滋滋的 app 跑在另外一台 Mac 上,然後透過 Universal Control 使用,大多數的情況下都夠用,真的有需要分享畫面時再跑在自己機器上,用完就可以關掉:

Thanks for the tip. I'll give this a try!

For work, I have to run Microsoft Teams, Slack, and Discord. Of those 3, Slack surprisingly uses the least amount of memory (~700 MB), and Teams uses the most (~1.5 GB). I dusted off an old Intel Mac (literally) and interact with it using Universal Control. It only runs those 3 chat apps + mail. It's turned out to be a great way to offload resource hogs and as an added benefit, it minimizes distractions. I'll occasionally glance at the dock to see if there are any notification badges, whereas on my main Mac, I'd feel compelled to deal with notifications immediately.

When I have to share my screen or focus on a conversation, I'll fire up one of those 3 apps on my main (M1) Mac and quit it when I'm done.

Universal Control still feels rough around the edges, but it has saved me from ditching my Macbook Air and shelling out for an M1 Macbook Pro. Sometimes there are issues with reconnecting to the Intel Mac, but it seems to resolve itself if I wait a bit or turn off/on wifi.

大家都在找方法 XDDD

Amazon EC2 有 Mac (M1) 機種可以租用了

2020 年年底的時候 AWS 推出用 Mac mini 配合搭建出 Mac (Intel) 機種:「Amazon EC2 推出 Mac Instance」,當初有計畫在 2021 年推出 M1 的版本:

Apple M1 Chip – EC2 Mac instances with the Apple M1 chip are already in the works, and planned for 2021.

不過就沒什麼意外的 delay 了,這次則是推出了 M1 的版本:「New – Amazon EC2 M1 Mac Instances」。

依照說明看起來還是 Mac mini,掛上 AWS Nitro System

EC2 Mac instances are dedicated Mac mini computers attached through Thunderbolt to the AWS Nitro System, which lets the Mac mini appear and behave like another EC2 instance.

然後跟 Intel 版本一樣,因為是掛進 Dedicated Hosts 的計價方式,雖然是以秒計費,但還是設定最低 24 小時的租用時間限制:

Amazon EC2 Mac instances are available as Dedicated Hosts through both On Demand and Savings Plans pricing models. The Dedicated Host is the unit of billing for EC2 Mac instances. Billing is per second, with a 24-hour minimum allocation period for the Dedicated Host to comply with the Apple macOS Software License Agreement. At the end of the 24-hour minimum allocation period, the host can be released at any time with no further commitment.

Intel 版本代號是 mac1,只有一種機種 mac1.metal,M1 版本代號是 mac2,也只有一種機種 mac2.metal

以最經典的美東一區 us-east-1 來看,mac1.metal 的 on-demand 價錢是 US$1.083/hour,mac2.metal 則是 US$0.65/hour,差不多是 60% 的價錢,便宜不少,大概是反應在硬體攤提與電費成本上了。

另外目前大家用 M1 的經驗來看,Rostta 2 未必會比原生的機器慢多少,雖然 mac1.metal 是 12 cores,mac2.metal 是 8 core,但以雲上面一定要用 Mac 跑的應用來說,馬上想的到的還是綁在 Apple 環境裡 CI 類的應用?

目前看起來主要的問題還是 24 小時的最小計費單位讓彈性低不少...

Apple 在 iOS 16、iPadOS 16 與 macOS Ventura 上推出 Lockdown Mode

AppleiOS 16、iPadOS 16 與 macOS Ventura 上推出了 Lockdown Mode:「Apple expands industry-leading commitment to protect users from highly targeted mercenary spyware」。

Lockdown Mode 主要是透過降低被攻擊的面積以提昇安全性,依照 Apple 的預想,主要是針對被政府單位盯上的族群:

Apple is previewing a groundbreaking security capability that offers specialized additional protection to users who may be at risk of highly targeted cyberattacks from private companies developing state-sponsored mercenary spyware.

在 Lockdown Mode 下目前列出來的限制:

  • Messages: Most message attachment types other than images are blocked. Some features, like link previews, are disabled.
  • Web browsing: Certain complex web technologies, like just-in-time (JIT) JavaScript compilation, are disabled unless the user excludes a trusted site from Lockdown Mode.
  • Apple services: Incoming invitations and service requests, including FaceTime calls, are blocked if the user has not previously sent the initiator a call or request.
  • Wired connections with a computer or accessory are blocked when iPhone is locked.
  • Configuration profiles cannot be installed, and the device cannot enroll into mobile device management (MDM), while Lockdown Mode is turned on.

列出來的這些的確都是之前 0-day 常被拿來打的東西,把攻擊面積縮小的確會有不少幫助。

這應該是業界第一個大咖跳進來做這個 (也就兩個大咖?),第一次搞未必會完美,但算是個開始,後面應該會有更多的面積被考慮進去...

Git 2.37.0 對巨大 Monorepo 的加速功能 FSMonitor

這邊用 GitHub 寫的說明好了:「Improve Git monorepo performance with a file system monitor」。

從 2.37.0 開始,Windows 與 Mac 版的使用者可以透過 FSMonitor 的功能記錄檔案系統的變化,大幅減少需要 scan 整個 repository 的時間,可以看到啟用後對於像是 chromium 這種大型專案的 status 時間就大幅下降了:

不過 Linux 還沒支援,目前我的環境都是 Linux,就沒辦法用了...

Mac 上 sprintf 的 scalability 問題

Hacker News 上看到個有趣的 scalability 問題,在 Mac 上的 sprintf() 因為有 lock 造成的 scalability 問題:「Curious lack of sprintf scaling (aras-p.info)」。

作者注意到 Mac 在多 CPU 下 sprintf() 會有 scalability 的問題,要注意到這邊的 Y 軸是對數比例:

用了 std::stringstream << 反而更慢 (作者還酸了一句「Zero cost abstractions」):

然後用了 Instruments 跑 profiling 找問題,可以看到看起來跟 locale 有關:

一般的情況下應該不會是問題,但如果是需要大量 sprintf() 組字串的人就會比較要注意了。

在「What else can we do?」這段有提到一些解法,包括了 stb_sprintf 當作替代品,以及 {fmt} 作為 iostreams 的替代品,然後另外是利用 to_chars 來解決,如果只是要把數字轉成字串。

算是蠻有趣的 bug hunting 過程,對於開發者來說,一般性的重點還是在 profiling,找到對的問題然後再往下提出解法...

Mac 上的小麥輸入法大改版 (2.0,不過目前已經又出 2.0.1 了)

Twitter 上看到 zonble 的推文:

整串可以看「Thread by @zonble on Thread Reader App」這邊,在 GitHub 上面的 release note 也可以參考:「Release 2.0 · openvanilla/McBopomofo」,不過要注意如果要下載的話,記得抓 bugfix 後的版本:「Release 2.0.1 · openvanilla/McBopomofo」。


在非 4K 的螢幕上跑 HiDPI

前幾天看到 BetterDummy 這個專案,作者在 M1 上面外接 24" 1440p 的螢幕,但沒辦法啟用 HiDPI,於是就寫了一個軟體來解:

M1 macs tend to have issues with custom resolutions. Notoriously they don't allow sub-4K resolution displays to have HiDPI ("Retina") resolutions even though (for example) a 24" QHD 1440p display would greatly benefit from having an 1920x1080 HiDPI "Retina" mode.

在這之前的解法都有些麻煩,一種是買個 dummy dongle 去騙 macOS,另外是用 mirror 的方式使用:

To fix this issue, some resort to buying a 4K HDMI dummy dongle to fool macOS into thinking that a 4K display is connected and then mirror the contents of this dummy display to their actual monitor in order to have HiDPI resolutions available. Others use the built in screens of their MacBooks to mirror to the external display. These approaches have obvious drawbacks and cannot solve all problems.

作者提供的軟體可以先建立 Dummy Monitor,然後再透過 mirror 掛到實際螢幕上:


在 Linux (Ubuntu) 上跑透過 QEMU 跑 Windows/Mac/Linux 的工具

Hacker News Daily 上看到的工具:「Quickly create and run optimised Windows, macOS and Linux desktop virtual machines.」,對應的討論在「Quickemu: Quickly create and run optimised Win-10,11/macOS/Linux on Linux (github.com/wimpysworld)」這邊可以看到,可以減少自己要設定一堆 QEMU 參數。

雖然專案是支援多系統,但其實 Microsoft WindowsLinux 的部份在其他虛擬軟體都很簡單 (像是用 VirtaulBox),大家馬上會注意到的重點還是 macOS 的部份,如果有自己弄過就會知道這東西有夠難裝的,而且跨版本有不同的安裝方式...

目前 Quickemu 支援四個版本:

Supported macOS releases:

  • High Sierra
  • Mojave
  • Catalina (Recommended)
  • Big Sur

然後可以看到幾乎所有目前能支援的功能都有設定上去了,包括 VirtIO 與 USB 的部份。

然後一些經典的問題,像是 Big Sur 的音源問題還是沒解:

Full Duplex audio works on macOS High Sierra, Mojave and Catalina.

  • macOS Big Sur has no audio at all.

在 Hacker News 的討論串裡面有提到有很多地方沒有檢查,這會是風險:

While I appreciate the effort, and the code is very readable. I just want to give a friendly warning that these shell scripts just download random stuff from the internet and run this random stuff without checking any integrity/signature.

下面的討論另外看到個冷知識,關於蘋果故意走 HTTP 下載 recovery image 是因為 HTTPS 太複雜,在 UEFI firmware 裡面實做容易產生被攻擊的點,所以決定自己透過其他機制確認正確性:

Apple Internet recoveryOS images are served over plain http, on purpose. The macrecovery.py script used by Quickemu uses http¹, though the server supports https.


> When the internet recovery and diagnostic modes were added to Mac computers in 2011, it was decided that it would be better to use the simpler HTTP transport, and handle content authentication using the chunklist mechanism, rather than implement the more complicated HTTPS functionality in the UEFI firmware, and thus increase the firmwareʼs attack surface.


[edit] Added macrecovery.py info

另外為了避免直接在 shell script 裡面出現「神秘字串」,可以看到特別的寫法 XDDD

Took a little while to find the magic words in there: https://github.com/wimpysworld/quickemu/blob/af26f41440d63a069045660fad860c797011310a/quickemu#L351

可以想到一些用途,像是在機房裡面跑 CI 的 worker,但要注意這個搞法不符合蘋果的 EULA,現在不抓不代表以後也不會有事,請自己謹慎評估...

然後往 ARM-based 架構後應該門檻就更高了,現在還有 Intel-based 的環境可以用加減用...

用 Podman 替代 Docker?

也是因為最近 Docker Desktop 改變授權的關係 (參考先前寫的「Docker Desktop 要開始對商用收費了,以及 Open Source 版本的設法」這篇),有不少人在講怎麼用 Podman 替代 Docker,不過要注意這邊的替代不是 drop-in replacement,而是功能上的替代。轉移的過程還是得花一些時間處理...

在 Mac 上面的範例大多都是用 Homebrew,我在 MacPorts 上也有看到套件:「podman」,看起來好像得多裝 qemu,但即使把 qemu 裝起來,也還是不會動... 後續因為沒有需求,加上先前已經把 Docker CLI 的版本弄好了,暫時就沒再多研究要怎麼跑起來。

另外有人寫了「Migrating from Docker to Podman」這篇,在「GUI Replacement」的部份還介紹了對應的 GUI 方案,也可以參考看看。

跟以前的養套殺類似,都會推動一些 open source 替代方案的成熟度,以這次的情況看起來這些能量有很大一部份都會進到 Podman 裡面,對於個人用戶也可以再放幾個月看看是不是要跳槽過去。