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Posts Tagged ‘solaris’

root password exposure on Ops Center provisioned hosts?

March 4, 2011 Leave a comment

# ls -l /var/opt/sun/jet/config/jumpstart.conf
-rwxr-xr-x 1 root other 1551 Apr 13 2010 /var/opt/sun/jet/config/jumpstart.conf

Contains the DES encrypted root password on line prefixed “JS_Default_Root_PW=” set during installation and is world-readable.

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MPI and Solaris on Coolthreads

October 4, 2010 Leave a comment

Coolthreads. Interesting boxes. What follows is a log of my experiments with MPI (Message Passing Interface)  as a way to exploit the large number of worker threads present on T-series Sun hardware.

With the workload below coordinated by MPICH2,  we see near linear performance increases from 1 to 16 threads and then a very shallow increase as we approach 32 threads, at which point there is no further improvement.

Could this performance ceiling be due to memory bandwidth limits or cache contention perhaps?

While 0 > x <= 64, mpirun -np $x ./john --test --format=MD5

CPUs:   1       Raw:    1149 c/s real, 1149 c/s virtual
CPUs:   2       Raw:    2298 c/s real, 2298 c/s virtual
CPUs:   3       Raw:    3447 c/s real, 3447 c/s virtual
CPUs:   4       Raw:    4596 c/s real, 4596 c/s virtual
CPUs:   5       Raw:    5739 c/s real, 5733 c/s virtual
CPUs:   6       Raw:    6882 c/s real, 6894 c/s virtual
CPUs:   7       Raw:    8043 c/s real, 8043 c/s virtual
CPUs:   8       Raw:    9192 c/s real, 9186 c/s virtual
CPUs:   9       Raw:    10303 c/s real, 10297 c/s virtual
CPUs:   10      Raw:    11438 c/s real, 11402 c/s virtual
CPUs:   11      Raw:    11941 c/s real, 11921 c/s virtual
CPUs:   12      Raw:    13606 c/s real, 13598 c/s virtual
CPUs:   13      Raw:    14741 c/s real, 14784 c/s virtual
CPUs:   14      Raw:    15822 c/s real, 15840 c/s virtual
CPUs:   15      Raw:    16298 c/s real, 16298 c/s virtual
CPUs:   16      Raw:    16815 c/s real, 16817 c/s virtual
CPUs:   17      Raw:    17094 c/s real, 17105 c/s virtual
CPUs:   18      Raw:    16467 c/s real, 16514 c/s virtual
CPUs:   19      Raw:    18438 c/s real, 18438 c/s virtual
CPUs:   20      Raw:    18449 c/s real, 18464 c/s virtual
CPUs:   21      Raw:    18516 c/s real, 18507 c/s virtual
CPUs:   22      Raw:    18638 c/s real, 18619 c/s virtual
CPUs:   23      Raw:    18433 c/s real, 18447 c/s virtual
CPUs:   24      Raw:    18998 c/s real, 19016 c/s virtual
CPUs:   25      Raw:    18857 c/s real, 18859 c/s virtual
CPUs:   26      Raw:    19126 c/s real, 19126 c/s virtual
CPUs:   27      Raw:    19377 c/s real, 19327 c/s virtual
CPUs:   28      Raw:    19603 c/s real, 19566 c/s virtual
CPUs:   29      Raw:    19745 c/s real, 19730 c/s virtual
CPUs:   30      Raw:    19876 c/s real, 19783 c/s virtual
CPUs:   31      Raw:    20100 c/s real, 20023 c/s virtual
CPUs:   32      Raw:    20049 c/s real, 20048 c/s virtual
CPUs:   33      Raw:    20123 c/s real, 20154 c/s virtual
CPUs:   34      Raw:    19971 c/s real, 19995 c/s virtual
CPUs:   35      Raw:    20120 c/s real, 20148 c/s virtual
CPUs:   36      Raw:    20010 c/s real, 19988 c/s virtual
CPUs:   37      Raw:    20038 c/s real, 20049 c/s virtual
CPUs:   38      Raw:    19955 c/s real, 19955 c/s virtual
CPUs:   39      Raw:    19871 c/s real, 19795 c/s virtual
CPUs:   40      Raw:    19849 c/s real, 19852 c/s virtual
CPUs:   41      Raw:    19788 c/s real, 19809 c/s virtual
CPUs:   42      Raw:    19841 c/s real, 19828 c/s virtual
CPUs:   43      Raw:    20012 c/s real, 19974 c/s virtual
CPUs:   44      Raw:    19947 c/s real, 19952 c/s virtual
CPUs:   45      Raw:    20055 c/s real, 20019 c/s virtual
CPUs:   46      Raw:    19994 c/s real, 19973 c/s virtual
CPUs:   47      Raw:    20094 c/s real, 20091 c/s virtual
CPUs:   48      Raw:    20190 c/s real, 20148 c/s virtual
CPUs:   49      Raw:    20340 c/s real, 20360 c/s virtual
CPUs:   50      Raw:    20271 c/s real, 20224 c/s virtual
CPUs:   51      Raw:    20456 c/s real, 20455 c/s virtual
CPUs:   52      Raw:    20596 c/s real, 20592 c/s virtual
CPUs:   53      Raw:    20411 c/s real, 20385 c/s virtual
CPUs:   54      Raw:    20503 c/s real, 20491 c/s virtual
CPUs:   55      Raw:    20372 c/s real, 20355 c/s virtual
CPUs:   56      Raw:    20274 c/s real, 20299 c/s virtual
CPUs:   57      Raw:    20347 c/s real, 20278 c/s virtual
CPUs:   58      Raw:    20343 c/s real, 20297 c/s virtual
CPUs:   59      Raw:    20299 c/s real, 20324 c/s virtual
CPUs:   60      Raw:    20360 c/s real, 20313 c/s virtual
CPUs:   61      Raw:    20395 c/s real, 20313 c/s virtual
CPUs:   62      Raw:    20423 c/s real, 20353 c/s virtual
CPUs:   63      Raw:    20364 c/s real, 20393 c/s virtual
CPUs:   64      Raw:    20352 c/s real, 20431 c/s virtual

Notes:

  • MPICH2 was compiled with the following flags :

./configure --enable-fast --enable-timer-type=gethrtime --enable-cache --enable-cxx --disable-f77 --disable-f90 --enable-threads --with-device=ch3:sock --prefix=/usr/local/mpich2

  • Results above are for 32-bit compilation of libraries and executables, there was no performance benefit to be seen when recompiled as 64-bit.

Room for improvements:

  • Analyse MPI performance, read Jack Dongarra paper ‘Review of Performance Analysis Tools for MPI Parallel Programs‘.
  • Use the Oracle Message Passing Toolkit (formerly Sun HPC ClusterTools) instead of MPICH, as its an optimised implementation for Solaris and includes Dtrace hooks.
  • Use the new hydra process manager, which is the default from MPICH2 1.3 releases onwards, instead of mpd.
  • Experiment with mpiexec CPU and cache binding options to reduce contention of hardware resources.

jumpstarting at 100/full

March 7, 2007 Leave a comment

Whilst on my first project to deliver three v490s to a customer, I despair at the network switch ports being forced to 100/Full. I’m shocked this is still standard practice when IEEE 802.3u fast ethernet auto-negotiation has been working quite happily since 1995!

The below boot invocation halved the install time from 1hour 19mins to 36minutes!

On the v490, I forced a boot net installation at 100/Full duplex by using :

ok> boot /dev/network@1:speed=100,duplex=full – install

Ethernet Best Practices : http://www.sun.com/blueprints/0704/817-7526.pdf

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