Two independent calculations based on two different algorithms
generated 206,158,430,208 (=3*2^36) decimal digits of pi and comparison
of two generated sequences *matched* up to 206,158,430,163 decimal
digits, e.g., 45 decimal digits difference. Then we are declaring
**206,158,430,000** decimal digits as the new world record.

(More details soon at http://pi2.cc.u-tokyo.ac.jp/index.html)

Job start : 18th September 1999 19:00:52 (JST)

Job end : 20th September 1999 08:21:56 (JST)

Algorithm :

Job start : 26th June 1999 01:22:50 (JST)

Job end : 27th June 1999 23:30:40 (JST)

Algorithm :

pi : 22144 96687 55157 3096**4**

1/pi: 96680 12734 08711 5351**4**

(First digit '3' for pi or '0' for 1/pi is not included in the above count.)

**Notes**. Programs consisted of two sets of routines, e.g. calculation routines and
message passing routines. Calculation routines were written by Dr. Daisuke
TAKAHASHI, a Research Associate at our Centre and rather speed sensitive
message passing routines were written by myself. Calculation routines used
were more optimized than these used for the
*51.5 billion record* establishment.
For establishing this new record, high speed message passing routines were
seriously used for both of programs, e.g. main program and verification
program.

**Machine used**: **HITACHI
SR8000**
at the Information Technology Center,
Computer Centre Division, University of Tokyo.
with **128 Processors**,
using the full total CPU, e.g. 128PE's (theoretical peak processing speed for
the single PE is eight Billion floating operations per second. One Trillion
floating point operations per second for all PE's), were definitely used
as single job and parallel processing for both of programs run.

Yasumasa KANADA
Information Technology Center, Computer Centre Division, University of Tokyo

(Old Computer Centre, University of Tokyo)

E-mail: kanada@pi.cc.u-tokyo.ac.jp