1. Hostname : iliad
2. Model Name: IBM System p 9119-595 1.9GHz
3. CPU
   • Model: POWER5 Chip (64 Bit)
   • Clock Rate: 1.9 GHz
   • Architecture: SMP
   • Integer Peak Performance: SPECint2000 : 1452 (per core)
   • Floating Peak Performance: SPECfp2000 : 2796 (per core)
   • Global Performance(Linpack)
     Rmax : 418 GFLOPS (64 core)
     Rpeak : 486 GFLOPS (64 core)
4. L1 Cache (per core)
   Instruction/Data: 64KB/32KB
5. L2 Cache
   Size : 7.6MB per MCM
   Organization: 10-way, 128-byte line
6. L3 Cache
   Size : 144MB per MCM
   Organization: 12-way , 256-byte line
7. Main Memory: 256 GB
8. Major Directories
   • /u1 : 100 GB
   • /u2 : 300 GB
   • /package : 200 GB
   • /work1: 1915 GB
   • /work2: 1913 GB
9. Job Submission
   • Interactive: yes ( 1 hrs limits)
   • Batch: LoadLeveler
   • LoadLeveler使用簡介
10. NCHC Consulting Window
    • E-mail address: a00scl00@nchc.org.tw
    • Telephone: 886-3-5776085 ext 205

1. System Software
   • ESSL V4.2
   • Parallel ESSL V3.2
   • PE V4.2
   • LoadLeveler V3.3
   • XL Fortran V9.1
   • XL C/C++ ENT ED V8 AIX
   • AIX 5L V5.3
2. Application Packages

   Most of application package on system are placed in /package directory. You may get further information for application packages list at http://www.nchc.org.tw/htdocs/customer_service/software_database/
   application_software_database/

1. Queue Policy

   Queue Name	Max CPUs	Max CPUs/job	CPU/Run time limit/job	Object
   serial	16	1	7 days	General Users
   4cpu	64	4	4 days
   8cpu	64	8	3 days
   16cpu	64	16	3 days
   mono	64	--	--	Special Users
   User Limit: max jobs/user = 3 max jobs/group = 10 max cpus/user = 16

2. Disk usage Constrained Policy
   • /tmp : clear files not accessed over 1 day.
   • /work1 : clear files not accessed over 2 week.
   • /work2 : clear files not accessed over 2 week.

     ATTN: due to disk space problem, please use /work* instead of /usr/tmp or /tmp
     ATTN: NCHC has no obligation for backup files under these working file system, and reverses the right to change/reconfigure/destroy these working filesystem without any backup.

1. C for AIX Compiler Command:
   "xlc" , “xlc_r” , "cc" , “cc_r”...
2. VisualAge C++ Compiler : (eg: xxx.C)
   "xlC" ,"xlC_r"
3. XL Fortran for AIX :
   "xlf" , "f77" , "xlf_r" , "xlf90"...
4. MPI for C :
   "mpcc" , "mpcc_r"
5. MPI for C++ : (eg: xxx.C)
   "mpCC" ,"mpCC_r"
6. MPI for Fortran
   "mpxlf" , "mpxlf90" , "mpxlf90_r"...
   
   example :
   Source file : run.C
   Execute file : run.exe
   
   mpCC -o run.exe run.C
   
   Detail refer to
   http://www.nersc.gov/vendor_docs/ibm/pe/am102mst02.html
7. Compiler Options - Performance:
   • Tyep of RS/6000 System : “-qarch=[architechture]”
     -qarch=pwr3 (IBM power 3 chip)
     -qarch=pwr4 (IBM power 4 chip)
     -qarch=pwr5 (IBM power 5 chip)
   • Tuning for specific system : “-qtune=[implementation]”
     -qtune=pwr3 (IBM power 3 chip)
     -qtune=pwr4 (IBM power 4 chip)
     -qtune=pwr5 (IBM power 5 chip)
   • Optimization Level ( -O,-O2, -O3, -O4 )
     Deault :
     no optimization
     -O3 is desired setting
     Use -qstrict ( When -O3 -qhot ) to restrict semantic alteration
     -O4 implied -O3 -qhot -qipa (only for wall struct)
8. Compiler Options – Data
   • Default Data type are 32-bit
     REAL*4,Complex*8
     Integer*4
     Logical*4
   • 64-bit Floation Poing Repersentation (-qrealsize=bytes)
     -qrealsize=8 for double precision (64-bit)
   • 64-bit mode ( -q64 )
   • Specify the maximum user data area ( -bmaxdata )
     In 32-bit mode, the default maximum user data area is 256MB.
     -bmaxdata:0x10000000 (default)
     -bmaxdata:0x80000000 (get eight 256MB segments, 2GB)
   • Specify the maximum space for the program stack area
     For automatic data area
     -bmaxstack= to overcome soft limit on stack size
     Maximun allowed value is 256MB for 32-bit mode

More Detail XL Fortran info refer to
http://www-306.ibm.com/software/awdtools/fortran/xlfortran/

More Detail C Language info refer to
http://www-3.ibm.com/software/ad/vacpp/