linuxism

https://www.makeopensourcegreatagain.com/rpms/

linuxism — Sun, 23 Oct 2022 12:19:45 +0900

https://www.makeopensourcegreatagain.com/rpms/

Google offers first part of its in-house M:N thread code as open source to Linux kernel

linuxism — Sat, 19 Sep 2020 07:36:27 +0900

Mon 10 Aug 2020 // 06:55 UTC

Google has confirmed it plans to contribute some of its in-house threading code to the Linux kernel, but hasn’t disclosed its motivations beyond a desire to share.

As described by Googler Peter Oskolkov on the Linux kernel mailing list, the tech is “an M:N userspace threading subsystem backed by Google-private SwitchTo Linux Kernel API. This subsystem provides latency-sensitive services at Google with fine-grained user-space control/scheduling over what is running when, and this subsystem is used widely internally (called schedulers or fibers).”

Scheduling and managing threads matters when you want to make sure your CPU cores don’t lie idle if there’s work they could usefully be doing. M:N threading is one approach, and it's typically more efficient than the 1:1 approach most kernels tend to use.

The Register asked Google to explain what it’s up to with this contribution to the kernel and was told simply: "Threading technology is widely used across Google."

Which makes a lot of sense given Google tries to wring the most out of its colossal server fleet.

We were also told the web goliath “generally wants to open source helpful production APIs" and is releasing this code in the spirit that saw it share the Abseil scheduling code and tcmalloc memory allocation routines.

While the post to the kernel mailing list targets version 5.9 of the Linux kernel, Google told us it has: "No firm timeframe to share at this time" regarding when Linux users might be able to play with its SwitchTo API. According to Oskolkov, the latest patches are "the first step to open-source this work."

Google first discussed this work in 2013 in a talk, and the lengthy time elapsed since that event could mean that Google now runs more advanced scheduling code in-house and is therefore comfortable open-sourcing old work.

Android’s reliance on the Linux kernel could be another factor here, as with many smartphones now boasting multi-core processors better threading could be desirable.

A few posts to the mailing list discussed the API in recent weeks, and Oskolkov said he’d submitted the last of the code. With the Linux 5.9 merge window currently open, we’ll soon know if it will hit the kernel sooner or later.

source - www.theregister.com/2020/08/10/google_scheduling_code_reaches_linux/

Install Citrix Workspace App on Fedora 32

linuxism — Sun, 19 Jul 2020 06:23:13 +0900

Download the clientCitrix Workspace App

https://www.citrix.com/downloads/workspace-app/legacy-workspace-app-for-linux/workspace-app-for-linux-1912.html

# dnf install ./ICAClient-rhel-19.12.0.19-0.x86_64.rpm

# dnf install motif motif.i686 libXaw libXaw.i686 libidn1.34

# /opt/Citrix/ICAClient/util/ctx_rehash

# ALL_CERTS='/etc/pki/ca-trust/extracted/pem/*.pem /etc/pki/tls/*.pem /usr/share/pki/ca-trust-source/ca-bundle.trust.crt'

# CITRIX=/opt/Citrix/ICAClient/keystore/cacerts

# for x in ${ALL_CERTS}; do ln -sf "${x}" "${CITRIX}" done

# ln -s /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem /opt/Citrix/ICAClient/keystore/cacerts/

# cd /opt/Citrix/ICAClient/keystore/cacerts/

# awk 'BEGIN {c=0;} /BEGIN CERT/{c++} { print > "cert." c ".pem"}' < tls-ca-bundle.pem

Edit /usr/share/applications/wfica.desktop (as root)

Change:

Exec=/opt/Citrix/ICAClient/wfica -icaroot /opt/Citrix/ICAClient %f

To:

Exec=env LD_PRELOAD="/lib64/libcrypto.so.1.0.2o" /opt/Citrix/ICAClient/wfica -icaroot /opt/Citrix/ICAClient %f

source - https://ask.fedoraproject.org/t/howto-citrix-receiver-on-fedora-30/1274/31

ThreadPoolTaskScheduler initialize method

linuxism — Sun, 29 Mar 2020 21:37:31 +0900

ThreadPoolTaskScheduler가 Spring Bean으로 설정되지 않았다면, initialize() 메서드를 명시적으로 호출합니다.

하지만, Spring Bean일 경우 ExecutorConfigurationSupport.afterafterPropertiesSet() 메서드에서 자동으로 initialize() 메서드가 호출됩니다.

[VirtualBox] To access USB on Linux host.

linuxism — Sun, 19 May 2019 11:33:52 +0900

sudo usermod -aG vboxusers $USER

Log out and log in again

[MUDIS] MU-8H NEW웨이티드88건반 전자피아노

linuxism — Sat, 18 May 2019 09:04:09 +0900

어린이날 기념으로 아이들을 위한 전자피아노를 검색한 결과 MUDIS 전자피아노를 구매하게 되었습니다. 저렴한 가격이지만 여러면에서 좋은 것 같습니다. 아이들도 저도 만족하고 있습니다. 88건반이라서 아이 둘이 같이 앉아서 연주할 수 있어서 좋은 것 같습니다.어린이날 기념으로 아이들을 위한 전자피아노를 검색한 결과 MUDIS 전자피아노를 구매하게 되었습니다. 저렴한 가격이지만 여러면에서 좋은 것 같습니다. 아이들도 저도 만족하고 있습니다. 88건반이라서 아이 둘이 같이 앉아서 연주할 수 있어서 좋은 것 같습니다. 음색을 11가지로 선택할 수 있고, 특히 시범연주곡이 10곡이 있어서 아이들이 좋아하더라구요. 전자피아노라 보니 음량조정, 건반터치, 녹음/재생기능 등이 가능해서 더 좋은 것 같습니다.

linux - reinstall GRUB2

linuxism — Sun, 12 May 2019 23:47:43 +0900

to boot your system with a live-cd like systemrescuecd.

mkdir /mnt/temp

mount /dev/xvda2 /mnt/temp/

mount: unknown filesystem type 'LVM2_member'
yum install lvm2
modprobe dm-mod
vgscan
vgchange -ay VolGroup00
fdisk -l
mount /dev/VolGroup00/LogVol00 /mnt/temp/

mount /dev/xvda1 /mnt/temp/boot

mount --bind /proc /mnt/temp/proc

mount --bind /sys /mnt/temp/sys

mount --bind /dev /mnt/temp/dev

chroot /mnt/temp /bin/bash

grub2-mkconfig -o /boot/grub2/grub.cfg

grub2-install /dev/sda

Fedora - locale: Cannot set LC_ALL to default locale: No such file or directory

linuxism — Tue, 23 Apr 2019 20:27:15 +0900

$ locale

locale: Cannot set LC_ALL to default locale: No such file or directory

# dnf -y install glibc-all-langpacks

references - https://bugzilla.redhat.com/show_bug.cgi?id=1565718

SL-C433W 컬러레이저프린터 구매후기

linuxism — Thu, 13 Dec 2018 20:31:04 +0900

SL-C433W 컬러레이저프린터

무선이라서 스마트폰에서 바로 프린트할 수 있어서 너무 편합니다.

스마트폰으로 인터넷에서 아이들이 좋아하는 캐릭터를 컬러로 바로 출력할 수 있어서 너무 좋아요.

구매 사이트

http://www.11st.co.kr/product/SellerProductDetail.tmall?method=getSellerProductDetail&prdNo=1336949164&xfrom=&xzone=

math

linuxism — Sun, 27 May 2018 07:57:10 +0900

Math.abs(x) : 절대값

Math.ceil(x) : 올림

Math.floor(x) : 버림

Math.round(x) : 반올림

source - https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Math