There is a historical memory leak problem in our Django app and I fixed it recently. As time goes by, the memory usage of app keeps growing and so does the CPU usage.

After some research, I figure out the cause. Some views does not close multiprocessing.Pool after using it. The problem disappears when I use Pool with with statement.

But I’m still interested in it and wrote some testing code. The script is run in Python 3.6.8 and produce similar result when using multiprocessing.ThreadPool.

Auto Switch Input Method in Evil

This setting makes it possible to switch input method based on the context of cursor when entering insert mode.

sis

I’m using sis package with this configuration. You may need to install macism if you’re not using railwaycat/emacsmacport. More settings can be found in emacs-smart-input-source.

(sis-ism-lazyman-config
  "com.apple.keylayout.US"
  "com.apple.inputmethod.SCIM.ITABC")

(sis-global-cursor-color-mode t)
(sis-global-respect-mode t)
(sis-global-context-mode t)
(sis-global-inline-mode t)

fcitx

You can also install fcitx-remote for-osx and use cute-jumper/fcitx.el to do so. As homebrew no longer support some build options, you need to follow the install instructions in the GitHub repository to build fcitx.

My first NAS is Synology DS120j, which is ARM based entry level product. It’s okay to use it for downloading and backup, but not power enough for running docker and virtual machine.

So I bought this NAS last month, and I’m satisfied with it. Here are the advantages and disadvantages.

Advantages

1. High performance.

   It is equipped with J4125 quad-core 2.0 GHz processor, 8G RAM, two 2.5G Ports and 4 bays. Here is the spec. Although J4125 is not the fastest CPU in 2022(the newer model coming with N5105), it is still able to run several docker containers together, and I can even run Synology and Windows 10 inside build-in Virtualization Station.

Today I tried to delete an inactive Internet account on system preference. It was deleted successfully but come back again after 20 seconds. This drives me nuts.

I tried these methods, but none of them works.

• Boot in safe mode, delete account.
• Delete record in ZACCOUNT table in ~/Library/Accounts/Accounts4.sqlite.
• Delete related items in Keychain Access app.

Later, RedHatDude’s answer gives me a clue, it looks like a iCloud sync problem. I tried to delete the account on my 3 MacBooks together. Thank goodness! It does not show up again.

In Django, when edit field in admin page or post data to forms, the leading and tailing whitespace in CharField and TextField are removed.

The reason is strip=True parameter in forms.CharField, which is added in Djagno 1.9. You can see the discussion in django tiket #4960 and here is source code. models.CharField and models.TextField use formfield() to create form to interact with user, then both of them eventually create a forms.CharField

In Django 3.1, Django support save python data into database as JSON encoded data and it is also possible to make query based on field value in JSONField. The detailed usage can be found here. If you are using older version and want to try this feature. Though there are many packages ported this function, I recommend django-jsonfield-backport.

django-jsonfield-backport

This package save data as JSON in database and also support JSON query. If your database meet the requirements (MySQL > 5.7, PG > 9.5, MariaDB > 10.2 or SQLite > 3.9 with JSON1 extension), you can use JSONField like Django’s native implementation.