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pmjdebruijn
Guru
Joined: 24 Jul 2003
Posts: 506
Location: Sittard, The Netherlands
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 Posted: Wed Sep 17, 2003 9:03 pm Post subject: What Apps benefit from NativePosixThreadLibrary |
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Hi,
I was wondering what applications really benefit from the NativePosixThreadLibrary:
1. All threaded applications
2. All applications written to use NPTL (if so how does one recognize such an applications?)
3. Maybe even single threaded apps, because a process is a thread more or less also...?
Kind Regards,
DrZ |
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verbatim
Apprentice
Joined: 13 Mar 2003
Posts: 223
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| Posted: Wed Sep 17, 2003 9:59 pm Post subject: |
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| I could be wrong, but I'm pretty sure it replaces the library being used for threading now in linux, so that all threaded applications benefit automatically. |
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pmjdebruijn
Guru
Joined: 24 Jul 2003
Posts: 506
Location: Sittard, The Netherlands
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| Posted: Thu Sep 18, 2003 11:40 am Post subject: |
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NPTL should increase linux' scalability, but how does that reflect on single CPU systems? Will they also benefit? or only SMP machines...
Bye,
DrZ |
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asimon
l33t
Joined: 27 Jun 2002
Posts: 979
Location: Germany, Old Europe
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| Posted: Thu Sep 18, 2003 5:01 pm Post subject: |
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Systems which run a lot of (which means hundreds or thousands) concurrent threads will benefit most. The typical desktop where only a small number of threads run concurrently won't benefit much from it.
NPTL will also speed up threading on single CPU machines, because operations like the creation of threads are evidently cheaper with NPTL then with the old linux thread library. |
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ebrostig
Bodhisattva
Joined: 20 Jul 2002
Posts: 3152
Location: Orlando, Fl
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| Posted: Thu Sep 18, 2003 6:22 pm Post subject: |
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Java is a typical app that will benefit from beeing recompiled with a GLIBC with NPTL.
Just emergeing glibc with nptl set in your USE flags is not going to do any good, you have to actually recompile your JDK too.
I'm sure there are other apps that are threaded which will benefit from it too.
I have been using glibc/nptl and j2sdk 1.4.1 for quite some time and it works fine.
Erik
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cederberg
Guru
Joined: 23 Jan 2003
Posts: 349
Location: Stockholm / Sweden
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| Posted: Thu Sep 18, 2003 10:40 pm Post subject: |
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| ebrostig wrote: | | Just emergeing glibc with nptl set in your USE flags is not going to do any good, you have to actually recompile your JDK too. |
I think if you use the sun-jdk-1.4.2 or later, NPTL is enabled by default. At least that is true for Red Hat, so it ought to work the same on a Gentoo box with NPTL. Also, sun-jdk is a binary ebuild, so there is really no recompilation going on.
I guess, though, that if you are using the sun-j2sdk ebuild (as Erik does) you really need to recompile (i.e. reemerge). |
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nephros
Advocate
Joined: 07 Feb 2003
Posts: 2139
Location: Graz, Austria (Europe - no kangaroos.)
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| Posted: Sun Sep 21, 2003 10:08 am Post subject: |
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| cederberg wrote: | | ebrostig wrote: | | Just emergeing glibc with nptl set in your USE flags is not going to do any good, you have to actually recompile your JDK too. |
I think if you use the sun-jdk-1.4.2 or later, NPTL is enabled by default. At least that is true for Red Hat, so it ought to work the same on a Gentoo box with NPTL. Also, sun-jdk is a binary ebuild, so there is really no recompilation going on.
I guess, though, that if you are using the sun-j2sdk ebuild (as Erik does) you really need to recompile (i.e. reemerge). |
I can cofirm that sun-jdk-1.4.2_01 uses NPTL without recompilation. It has also been stated elsewhere that binary jdk seems to be faster than self-compiled, probably because of the use of proprietary optimizing compilers (intel-jdk/icc comes to mind, no idea what the sun people use).
What are typical apps apart from java which will benefit?
A quick emerge -pve world on my system showed that part from glibc only wine and fltk respect the +nptl USE flag.
Multimedia apps are typically threaded, so I re-emerged things like transcode and mplayer. Blender would probably benefit too. I also recompiled bzip2 and friends, but I doubt they use threads.
Anything else?
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yardbird
l33t
Joined: 20 Apr 2002
Posts: 689
Location: nl.leiden
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| Posted: Sun Sep 21, 2003 6:06 pm Post subject: |
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| nephros wrote: |
Multimedia apps are typically threaded, so I re-emerged things like transcode and mplayer. |
MPlayer is single-threaded, as far as I remember. It is a precise architectural policy of MPlayer devs. If you are looking for a threaded version of MPlayer, go to http://mplayerxp.sf.net. |
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