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Heretic
Tux's lil' helper
Joined: 03 Jul 2002
Posts: 114
Location: Austin, TX USA
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 Posted: Wed Jan 05, 2005 5:41 am Post subject: Java with kernel 2.6 and NPTL only uses one CPU |
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I have a Java application that fires off a bunch of worker threads, but when I check on top, only 1 of the CPUs is completely taxed while the other are completely idle. I have enabled nptl support. I tried both the jun and blackdown JVMs, neither helped:
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archimonde root # cat /proc/version
Linux version 2.6.10-gentoo-r2 (root@archimonde) (gcc version 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)) #1 SMP Tue Jan 4 11:18:35 CST 2005
archimonde root # java-config -L
[blackdown-jre-1.4.2.01] "Blackdown JRE 1.4.2.01" (/etc/env.d/java/20blackdown-jre-1.4.2.01)
[sun-jre-bin-1.4.2.06] "Sun JRE 1.4.2.06" (/etc/env.d/java/20sun-jre-bin-1.4.2.06)
[blackdown-jdk-1.4.2.01] "Blackdown JDK 1.4.2.01" (/etc/env.d/java/20blackdown-jdk-1.4.2.01)
[sun-jdk-1.4.2.06] "Sun JDK 1.4.2.06" (/etc/env.d/java/20sun-jdk-1.4.2.06) *
archimonde root # emerge -pv gcc glibc blackdown-jdk blackdown-jre
These are the packages that I would merge, in order:
Calculating dependencies ...done!
[ebuild R ] sys-devel/gcc-3.3.4-r1 +X -bootstrap -build -debug +fortran -gcj -hardened -multilib +nls -objc +pic -static (-uclibc) 0 kB
[ebuild R ] sys-libs/glibc-2.3.4.20040808-r1 -build -debug -erandom -hardened -multilib +nls +nptl +pic* +userlocales* 0 kB
[ebuild R ] dev-java/blackdown-jdk-1.4.2.01 -doc +mozilla* 0 kB
[ebuild R ] dev-java/blackdown-jre-1.4.2.01 +mozilla* 0 kB
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Any ideas on how to get Java threads running concurrently on multiple processors? |
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Heretic
Tux's lil' helper
Joined: 03 Jul 2002
Posts: 114
Location: Austin, TX USA
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| Posted: Wed Jan 05, 2005 5:39 pm Post subject: |
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| Also, before kernel version 2.6.10, CPU didn't on Java wouldn't show up under top either. |
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