/proc/interrupts and reproducibility of FP caculations
Does anyone undesrstand why the following things occur on my opteron?
1. I am running a 64 bit kernel on opteron, which I compiled
by "gcc-3.3 -m64" from a linux 2.4.21 obtained from x86-64.org.
smk8m> cat /proc/version
Linux version 2.4.21-030702-k8-smp-64gb-devfs-raid-ext3 (root@smk8m) (gcc version 3.3 (Debian)) #1 SMP Sat Jul 5 07:53:12 JST 2003
The following is the output of /proc/interrupts.
smk8m> cat /proc/inter*
0: 85028306 0 IO-APIC-edge timer
1: 5 0 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
4: 6 0 IO-APIC-edge serial
12: 6 0 IO-APIC-edge PS/2 Mouse
24: 15249253 0 IO-APIC-level ioc0, eth0
25: 44 0 IO-APIC-level ioc1
NMI: 667118 677988
LOC: 85025444 85025445
Does anyone understand why only cpu0 is used for timer and ..?
2. I tried to run a program which use a function called dsyev in LAPACK on
this opteron; dsyev is a program of calculation eigen values and vectors
of a symmetric matrix. A strange thing is that eigen vectors differ
every run. Of course, they are always same on xeon systems.
(LAPACK library is the 32 bit version.)
ii lapack 3.0.20000531a- a library of linear algebra routines - share
ii lapack-dev 3.0.20000531a- a library of linear algebra routines - stati