Eclipse problems on Fedora 22

Update: Since Eclipse Mars update in Fedora 22, and with latest updates installed, the memory/CPU usage problem is fixed. Also, the problem with mylyn icons is fixed. While there are still some rendering bugs, along with some bad colors here and there; the GTK3 version is now usable for me. :)

Since upgrade to Fedora 22, I had several problems with Eclipse. The most annoying one, in my pretty old laptop, was nearly locking up the system after using it for awhile as reported here. I found that my 4GB RAM is almost full and kswapd is taking almost 100% CPU.

First, I suspected that it is a kernel bug since kswapd was using 100% CPU. And, it seems that it really is, but it is an old kernel problem happens when the available RAM is low. Therefore, it should not be the main reason of my problems.

Investigating more, I found the the amount of ‘shared’ memory in ‘free -m’ output keeps increasing when I use Eclipse until I’m forced to close Eclipse due to lock up. Then it is returned back to normal. I guess this is a graphics driver bug, as the Eclipse memory usage reported by ‘top’ is not changed much since its start. (and the kernel out of memory messages always happen in the driver code).

Anyway, besides, Eclipse was very ‘heavy’ on my laptop: it constantly used very high CPU usage even if I just scrolled the editor window. It was also very slow (with lag). Also Eclipse uses a new coloring for various part of the UI in F22, which are sometimes very annoying (e.g. unreadable text, unnoticeable selected region, etc). I was forced to change some colors to have a usable editor.

I was living by all these problems until yesterday, in which I found that mylyn task list is also buggy. It didn’t show unread/new issue marks beside issue icons, so I was missing new/updated issues assigned to me. I was seriously considering switching back to Fedora 21, when I suddenly found out that Eclipse is using GTK3 backend in Fedora 22 and I should be able to make it use GTK2 instead.

The first way to do this I found in Internet was setting SWT_GTK3 environment variable to 0. But it didn’t work in Fedora 22. It turns out that Eclipse has a command line argument for it, which is used by Fedora (in /etc/eclipse.ini) to force usage of GTK3 backend. So, to run Eclipse with GTK2 backend, you are forced to either modify eclipse.ini, or run eclipse with the following command line option:

eclipse --launcher.GTK_version 2

And yes, finally, it fixed all my problems with Eclipse in Fedora 22!

Happy New Year (1394)! :)

Yes, it is a long time sine last time I updated my blog. I really liked to blog about a few things like Fedora 21 release, but I didn’t managed to. Hopefully, there will be more posts this year! :)

And this is my card for the new Solar/Jalali(? if I’m not wrong :P) year, Happy Nowruz (the first day of year in our calendar is called Nowruz)!

Happy Nowruz

The Shiny New DNF, and Why I Prefer Yum!

You certainly already know about DNF, the new package manager in Fedora which is available in Fedora repositories since Fedora 18 while Yum is still the default (command line) package manager. However, DNF is expected to replace Yum as the default command line package manager in Fedora 22. And so, every Fedora user should consider it seriously.

DNF has some interesting properties that I really liked about it. Probably the most visible one, and certainly the most exciting one for me, is speed. It is really much faster than Yum. Yum spend much time specially when starting up. For example, I ran a similar “list” command using both DNF and Yum for a few times. Yum took around 25 to 29 seconds to do it, while DNF did it in about 5 seconds (no downloads for both). I don’t know what does do during this period, but my HDD is busy most of the time.

Surprisingly, Yum downloads compressed SQLite metadata, but DNF downloads compressed XML metadata. The former is considerably larger than the latter, but Yum selected it for speed purposes! AFAIK, DNF (actually libsolv) doesn’t use XML metadata internally but converts them to its own format; and IMHO this is actually the right thing to do. Yum could also use a similar approach (I’d prefer), but maybe they preferred to waste bandwidth rather than client’s processing power (and yum wouldn’t be faster than today anyway).

It was great news for me; not only DNF is way faster than Yum, but also it downloads much smaller metadata (about half the size of compressed sqlite dbs used by Yum)… However, I was wrong; The amount of metadata downloaded by DNF is actually more than that of Yum! I saw that Yum downloads about 20M of metadata for fedora-updates repository while DNF get around 30M! Why? Because DNF is too lazy and downloads all metadata, including list of all files in all packages which is around 15M; while Yum only downloads list of files when they are actually needed. And in my system, Yum has never downloaded the list of files while DNF downloads them every time the repository is updated. I always hated Yum for downloading such a large metadata over and over again, and DNF is just horrible. Unfortunately, DNF author has no will to change the situation.

Actually, I use two plugins with Yum which I’d like to have in DNF too: yum-plugin-local and my own Yum Fast Downloader. The former is not that important, and I can live without it; and I hope to be able to create an equivalent of the latter, while it will need a completely new approach.

Currently, I use DNF for some operations like search and list commands, but use Yum for most other tasks. And I almost always run DNF from cache, except when I have free Internet access! I’ve also disabled automatic cache download by DNF, which can make DNF much more hostile!

DNF can eat your Internet credit silently!

Let’s assume that you pay for your Internet connection per GiB. And you install Fedora with DNF, and use it for one month. You never use DNF during this month. Now, you might get shocked that DNF has used about 1GiB of your internet credit, while you have not used it at all! Even if you decide to use DNF after one month, what you get is the latest metadata. So, 30MiB of that 1GiB is what you actually used. Yes, this is currently the default settings, which I consider insane. If Fedora 22 is released with DNF configured like this, it means that: Fedora 22 consumes about 1 GiB of your internet connection by default just for downloading repository metadata! Surprisingly, even if you update your Fedora regularly, the amount of actual data you download to update your Fedora might be less than that (thanks to delta RPMs).
Its true that the repository metadata format is currently very inefficient for updates and you should get all metadata again even if one package is added, and it is not DNF’s fault, but the decision to download metadata automatically, and downloading unnecessary metadata, is what DNF has made. That makes sense for people who have access to cheap internet, or don’t pay for it per GiB; but IMHO this should not be the default settings for a distribution like Fedora.
And, 1 GiB per month is just an estimate. I assumed that updates are pushed to Fedora updates repository once per day, and the metadata is around 30MiB. However, if, for example, updates are pushed two times a day, the estimate would be around 2GiB. Notice that with the default settings, DNF refreshes metadata every 3 hours. So, if there are regular updates in Fedora updates repository, DNF would re-get metadata up to 8 times a day, which will be around 8*30=240MiB per day, which will be 8GiB per month…

Anyway, if you happen to install DNF, make sure that you check metadata_timer_sync option in “man dnf.conf” and put an appropriate option in your dnf.conf. I use “metadata_timer_sync=0” as I don’t want it to waste my money for no good!


Parsidora 20 is out!

Took some time, but finally, I’m pleased to announce that Parsidora 20 is ready. It is based on Fedora 20 and its latest updates including: Linux kernel 3.15.4, Gnome 3.10.4, LibreOffice, and KDE 4.12.5. Additionally, latest packages from RPMFusion is included such as driver akmod packages, audio/video codecs and players and more. Also, there are some packages in Parsidora repositories like Flash player and Jockey (Old Ubuntu’s “Additional Hardware Drivers” application) to enhance out of the box functionality. Finally, it includes my Yum Fast Downloader plugin! ;)

Unlike most other Fedora remixes, it is mainly provided as an installation media rather than Live disk; and contains lots of packages so that it can provide most of users’ needs without downloading anything from the internet.

While users are more likely to have access to fast AND cheep internet connection these days, there are still many who don’t; and also, there are many situations I personally face which I want to have a new fully working Fedora installation as fast as possible, and downloading packages from Internet is not an option.

Parsidora is Fedora compatible, so it can be even used as an offline repository for existing Fedora installations. Yes, many of you might wonder if an offline repository is useful, but believe me, there are people who might access Internet using dial-up or GPRS, or have good but expensive internet connection.

Anyway, while we are late, I’m happy that it is finally available! :)

Nowruz Gift: Yum Fast Downloader 0.6.0 Released!

Happy Nowruz!

Gladly, I was able to devote some time to update yum fast downloader plugin to work much better with recent yum versions in Fedora 19/20. The plugin effectively disabled delta rpm support since the integration of presto into yum. To fix the issue, I reworked the plugin using the new download framework of yum/urlgrabber. The result is yum-fast-downloader plugin for Fedora 20, which not only fixes the problem but also brings better integration. As a result, the plugin is now responsible for almost all downloads including downloading drpm packages.
Besides, it is now possible to specify arbitrary command line arguments (e.g. -q) for aria2c in the plugin’s configuration file. Unlike previous versions, in this version download of multiple files in parallel are handled by multiple instances of aria2c; but I’d like to change it back to a single aria2c instance in future. I’ve added the new version for Fedora 20 in the repo, but not for Fedora 19. It should work on Fedora 19 too, but I have not tested it. If you tried YFD 0.6.0 in Fedora 19 successfully, please let me know so that I’ll add the new version to F19 repo too. Thanks!

What about DNF?
DNF looks promising. It is much faster than yum, and even uses xml metadata rather than sqlite ones which are smaller. However, it’s internal structure is completely different from yum, so it needs a completely new plugin. I’m still not sure if it is possible, but I’ll try in future. :)

Parsidora 18

Finally, the fifth version of our Fedora remix, Parsidora 18, is released. Parsidora is our Fedora remix specially targeted for users which don’t have fast and/or cheap internet connections, and for Persian users. It also tries to provide a painless out of the box experience for users.

Parsidora differs with most other Fedora remixes in two points: 1. Its images are big, as we try to use all the space available in a DVD. 2. It is (mainly) provided as installation media, rather than live media.
It is actually what an offline user would/should prefer. Such users usually don’t download Fedora, and try to grab its media physically. Therefore, when more packages are available on media, they will be happier since they don’t need to download them. Even downloading the metadata of Fedora repositories is a pain for some users.

It should not be a live distro, because users rarely need to install all the packages and should be able to install only what they need. And it’ll probably need more space in live form. There is an additional bonus: Parsidora DVDs can be used as add-on repository for existing (and not very uptodate) Fedora installations.

Previously, I wrote about problems building updated Fedora 18 installation disks, like what happened for Fedora 17. Unfortunately, I was unable to work around the problem and Fedora doesn’t care much about building updated installation media after the release. Unlike Parsidora 17, this time we decided to release Parsidora 18, without any updates (except some updates from rpmfusion). It is not what we liked, but it is better than not having any release for a long time. I hope that Fedora 19 updates won’t break installation media creation unlike Fedora 17 & 18.

I’m happy that we have a new release. However, I’m waiting for Fedora 19 release to release Parsidora 19 soon afterwards, specially considering the negative effect of Gnome 3.6 on me :P. 3.8 looks a little better at least.

Have fun!

Problems in creating a Fedora installation disk spin (Parsidora)

Parsidora 17 was not released, because fedora installation disks created from Fedora 17 updates repository didn’t work. We decided to skip Parsidora 17 and create Parsidora 18. Parsidora 18 images were ready long time ago, but we have not released it yet. Why? Because if you create an installation disk using pungi (with updates repository enabled), the installer will crash on boot. Unfortunately, the bug is unnoticed after a long time. If you create a Fedora installation disk with release repositories, it works fine but if you try with updates repository enabled, it’ll crash. I’ve tried a lot to find the offending package, but my efforts have been fruitless. I’ve created images with old kernel, anaconda, and even Xorg, but all of them crash.
I’ll try a little longer, but we might decide to release Parsidora 18 with no updates, which is very undesirable. I hope things get better for Fedora 19 and later. :(

Oh, new Solar (Jalali) year has come 13 days ago and we are in year 1392. Happy Nowruz! :)

Happy Nowruz

Happy Nowruz


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