[systemd-devel] systemd-readahead and often used applications

[Reindl Harald]

Am 14.04.2013 21:18, schrieb Kok:
> On Sun, Apr 14, 2013 at 12:05 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>> what about a dbus-triggered instance like cups and other services
>> are fired up after login which creates a /.readahead-usersession
>> proceeded at boot the same way as /.readahead
> 
> it does more damage to do excessive readahead at boot for services
> that don't need to start until way, way after boot. The whole idea is
> to only read things you are going to need, and not more. Otherwise you
> could just read everything you can possibly read from disk into
> memory

oh, now i realized that systemd-readahead covers any file-type
surely it would be bad preloading anything including data

please have a look at http://koji.fedoraproject.org/koji/buildinfo?buildID=393183
this is covering only libraries but seems to be in a bad maintaining-state
because still no systemd-unit and all of te last updates where auto mass-rebuilds

i wrote a systemd-unit for my machine which starts after kdm.service
https://bugzilla.redhat.com/show_bug.cgi?id=951956

>> well, but that makes "systemd-readahead-done.timer" useless as also
>> extend how long the collector should run
> 
> most people won't ever need to have it run more than 10 seconds until
> after the system is done booting, so it has good value. Longer isn't
> better (see my earlier argument, which holds especially true for
> rotating media)

correct for readahead any file-type

with the "preload"-package above systemd-readahead covers also user-apps
between several reboots without graphical login because it sees the
preloading of the adaptive service and ONLY libraries

maybe this logic over the long in systemd can make preload obsolete

[root at rh:~]$ /usr/lib/systemd/systemd-readahead analyze | grep thunderbird
   100% ( 1)        11192: /usr/lib64/thunderbird/libmozalloc.so
   100% ( 1)        16560: /usr/lib64/thunderbird/components/libdbusservice.so
   100% ( 1)        15280: /usr/lib64/thunderbird/libldif60.so
   100% ( 1)        19592: /usr/lib64/thunderbird/libxpcom.so
   100% ( 1)        24304: /usr/lib64/thunderbird/libprldap60.so
   100% ( 1)        38680: /usr/lib64/thunderbird/components/libmozgnome.so
   100% ( 1)        84960: /usr/lib64/thunderbird/thunderbird
   100% ( 1)       223656: /usr/lib64/thunderbird/libldap60.so
   100% ( 1)       393632: /usr/lib64/thunderbird/langpacks/langpack-de at thunderbird.mozilla.org.xpi
   100% ( 1)      8372428: /usr/lib64/thunderbird/omni.ja

[root at rh:~]$ /usr/lib/systemd/systemd-readahead analyze | grep java
   100% ( 1)         7344: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/bin/java
   100% ( 1)       181312: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/libjava.so
   100% ( 1)        94888: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/libnet.so
   100% ( 1)        73856: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/libnio.so
   100% ( 1)        61248: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/libverify.so
   100% ( 1)        36448: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/libzip.so
   100% ( 1)        91994: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/jce.jar
   100% ( 1)       679167: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/jsse.jar
   100% ( 1)      2540855: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/resources.jar
   100% ( 1)        57904: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/amd64/jli/libjli.so
   100% ( 1)        69689: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/ext/pulse-java.jar
   100% ( 1)       452955: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.17.x86_64/jre/lib/ext/gnome-java-bridge.jar
   100% ( 1)       186530:
/usr/local/Zend/ZendStudio/plugins/org.zend.sdk_1.0.6.201210091843/lib/openshift-java-client-2.0.0.jar
   100% ( 1)       113129:
/usr/local/Zend/ZendStudio/configuration/org.eclipse.osgi/bundles/474/1/.cp/lib/svnkit-javahl.jar
   100% ( 1)       189996:
/usr/local/Zend/ZendStudio/configuration/org.eclipse.osgi/bundles/475/1/.cp/lib/svnkit-javahl.jar
   100% ( 1)      4973536: /usr/lib64/libjavascriptcoregtk-1.0.so.0.13.11


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