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How To Improve Application Startup Time In Linux
======
![](https://www.ostechnix.com/wp-content/uploads/2018/05/Preload-720x340.png)
Most Linux distributions are fast enough by default. However, we can still make them a little bit faster using some additional applications and methods. One such application we are about to see is **Preload**. It monitors the most frequently-used applications by the user and adds them to the memory, so that the applications will load little bit faster than before. Because, as you might already know, reading from the RAM is always faster than from the hard drive. Preload runs as a daemon on the background all the time and records the statistics about usage of files by more frequently-used programs. It then fetches those binaries and their dependencies into memory to improve the application loading time. In a nutshell, once preload is installed, you should be able to load the often-used applications much faster.
In this brief tutorial, we are going to see how to install and use Preload to improve an application startup time in Linux.
### Improve Application Startup Time In Linux Using Preload
Preload is available in [**AUR**][1]. So you can install it using AUR helper programs in any Arch-based systems such as Antergos, Manjaro Linux.
Using [**Pacaur**][2]:
```
$ pacaur -S preload
```
Using [**Packer**][3]:
```
$ packer -S preload
```
Using [**Trizen**][4]:
```
$ trizen -S preload
```
Using [**Yay**][5]:
```
$ yay -S preload
```
Using [**Yaourt**][6]:
```
$ yaourt -S preload
```
On Debian, Ubuntu, Linux Mint, Preload is available in the default repositories. So you can install it using APT package manager like below.
```
$ sudo apt-get install preload
```
Once Preload installed, reboot your system. From now on, Preload monitors the frequently-used applications and adds their binaries and libraries into the Memory for faster startup time. For example, if you often use Firefox, Chrome or LibreOffice, Preload will then add those binaries and libraries into RAM, so those applications will start faster. Good thing is it doesn’t need any configuration. It will just work out of the box. If you, however, wants to tweak the configuration, you can do it by editing the default configuration file **/etc/preload.conf**.
### Preload isn’t for everyone!
Here are some drawbacks of Preload and why it is not that effective for everyone, discussed in this [**thread**][7].
1. I do have a decent specification system with 8GB RAM. So my system is generally fast. Also, I will open heavy memory-consuming applications, such as Firefox, Chrome, VirtualBox, Gimp etc., one or two times per day. They remain open all the time, hence their binaries and libraries are preloaded into memory and occupying the RAM all day. I rarely close and open those applications, so the RAM usage is simply waste.
2. If you’re using modern systems with SSD, Preload is obviously useless. Because SSDs access time is much faster than normal hard drives, so using Preload is pointless.
3. Preload significantly affects the boot time. Because the more applications are preloaded into RAM, the longer it takes to get your system up and running.
You will only the see the real difference only if you’re reloading applications a LOT of time per day. So Preload will be ideal for the developers and testers who open and close the applications several times everyday.
For more details about what exactly preload is and how it works, read the complete [**Preload thesis**][8] paper submitted by the author.
And, that’s all for now. Hope this was useful. More good stuffs to come. Stay tuned!
Cheers!
--------------------------------------------------------------------------------
via: https://www.ostechnix.com/how-to-improve-application-startup-time-in-linux/
作者：[SK][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.ostechnix.com/author/sk/
[1]:https://aur.archlinux.org/packages/preload/
[2]:https://www.ostechnix.com/install-pacaur-arch-linux/
[3]:https://www.ostechnix.com/install-packer-arch-linux-2/
[4]:https://www.ostechnix.com/trizen-lightweight-aur-package-manager-arch-based-systems/
[5]:https://www.ostechnix.com/yay-found-yet-another-reliable-aur-helper/
[6]:https://www.ostechnix.com/install-yaourt-arch-linux/
[7]:https://askubuntu.com/questions/110335/drawbacks-of-using-preload-why-isnt-it-included-by-default
[8]:https://cs.uwaterloo.ca/~brecht/courses/702/Possible-Readings/prefetching-to-memory/preload-thesis.pdf

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如何改善应用程序在 Linux 中的启动时间
======
![](https://www.ostechnix.com/wp-content/uploads/2018/05/Preload-720x340.png)
大多数 Linux 发行版在默认配置下已经足够快了。但是，我们仍然可以借助一些额外的应用程序和方法让它们启动更快一点。其中一个可用的这种应用程序就是 **Preload**。它监视用户使用频率比较高的应用程序，并将它们添加到内存中，这样就比一般的方式加载更快一点。因为，正如你所知道的，内存的读取速度远远快于硬盘。Preload 以守护进程的方式在后台中运行，并记录用户使用较为频繁的程序的文件使用相关的统计数据。然后，它将这些二进制文件及它们的依赖项加载进内存，以改善应用程序的加载时间。简而言之，一旦安装了 preload，你使用较为频繁的应用程序将可能加载的更快。
在这篇详细的教程中，我们将去了解如何安装和使用 Preload，以改善应用程序在 Linux 中的启动时间。
### 在 Linux 中使用 Preload 改善应用程序启动时间
Preload 可以在 [**AUR**][1] 上找到。因此，你可以使用 AUR 助理程序在任何基于 Arch 的系统上去安装它，比如，Antergos、Manjaro Linux。
使用 [**Pacaur**][2]:
```
$ pacaur -S preload
```
使用 [**Packer**][3]:
```
$ packer -S preload
```
使用 [**Trizen**][4]:
```
$ trizen -S preload
```
使用 [**Yay**][5]:
```
$ yay -S preload
```
使用 [**Yaourt**][6]:
```
$ yaourt -S preload
```
在 Debian、Ubuntu、Linux Mint 上，Preload 可以在默认仓库中找到。因此，你可以像下面一样，使用 APT 包管理器去安装它。
```
$ sudo apt-get install preload
```
Preload 安装完成后，重新启动你的系统。从现在开始，Preload 将监视频繁使用的应用程序，并将它们的二进制文件和库添加到内存中，以使它的启动速度更快。比如，如果你经常使用 Firefox、Chrome 以及 LibreOffice，Preload 将添加这些二进制文件和库到内存中，因此，这些应用程序将启动的更快。而且更好的是，它不需要做任何配置。它是开箱即用的。但是，如果你想去对它进行微调，你可以通过编辑缺省的配置文件 **/etc/preload.conf** 来实现。
### Preload 并不一定适合每个人！
以下是 Preload 的一些缺点，它并不是对每个人都有帮助，在这个 [**跟贴**][7] 中有讨论到。
1. 我使用的是一个有 8GB 内存的现代系统。因此，我的系统总体上来说很快。我每天只打开狂吃内存的应用程序（比如，Firefox、Chrome、VirtualBox、Gimp、等等）一到两次，并且它们始终处于打开状态，因此，它们的二进制文件和库被预读到内存中，并始终整天在内存中。我一般很少去关闭和打开这些应用程序，因此，内存使用纯属浪费。
2. 如果你使用的是带有 SSD 的现代系统，Preload 是绝对没用的。因为 SSD 的访问时间比起一般的硬盘来要快的多，因此，使用 Preload 是没有意义的。
3. Preload 显著影响启动时间。因为大多数的应用程序都预读到内存中，长此以往，将让你的系统启动和运行的更快。
你只有在每天都在大量的重新加载应用程序时，才能看到真正的差别。因此，Preload 最适合开发人员和测试人员，他们每天都打开和关闭应用程序好多次。
关于 Preload 更多的信息和它是如何工作的，请阅读它的作者写的完整版的 [**Preload 论文**][8]。
教程到此为止，希望能帮到你。后面还有更精彩的内容，请继续关注！
再见！
--------------------------------------------------------------------------------
via: https://www.ostechnix.com/how-to-improve-application-startup-time-in-linux/
作者：[SK][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[qhwdw](https://github.com/qhwdw)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.ostechnix.com/author/sk/
[1]:https://aur.archlinux.org/packages/preload/
[2]:https://www.ostechnix.com/install-pacaur-arch-linux/
[3]:https://www.ostechnix.com/install-packer-arch-linux-2/
[4]:https://www.ostechnix.com/trizen-lightweight-aur-package-manager-arch-based-systems/
[5]:https://www.ostechnix.com/yay-found-yet-another-reliable-aur-helper/
[6]:https://www.ostechnix.com/install-yaourt-arch-linux/
[7]:https://askubuntu.com/questions/110335/drawbacks-of-using-preload-why-isnt-it-included-by-default
[8]:https://cs.uwaterloo.ca/~brecht/courses/702/Possible-Readings/prefetching-to-memory/preload-thesis.pdf