18th December 2016

Our latest record was established as the followings:

Declared record:
 The 100 quadrillionth (= 10^17-th) hexadecimal digit

The main run computed 32 hexadecimal digits of pi starting at
position 10^17, and the verification run computed 32 hexadecimal
digits of pi starting at position 10^17 - 1. A comparison of these
results showed that the hexadecimal digits of pi from the 10^17-th to
the 10^17 + 22-nd digits were consistent. Then we are declaring the
100 quadrillionth hexadecimal digit as the new world record.

Main run:
 Job start          :  3rd December 2016 21:02:07 (JST)
 Job end            : 18th December 2016 03:20:11 (JST)
 Total elapsed time : 320 hours 31 minutes
 Formula            : Bellard's formula

Verification run:
 Job start          :  3rd December 2016 21:02:07 (JST)
 Job end            : 18th December 2016 04:27:37 (JST)
 Total elapsed time : 320 hours 57 minutes
 Formula            : Bellard's formula

The hexadecimal digits of pi from the 10^17-th to the 10^17 + 15-th
digits are:
 pi: A937EB59439E485E
     ^
 The 10^17-th hexadecimal digit
 (First digit '3' for pi is not included in the above count.)

The program was written by myself. The computer used was the
Oakforest-PACS (Fujitsu PRIMERGY CX1640 M1 cluster) at the Joint
Center for Advanced High Performance Computing (JCAHPC), which the
University of Tokyo and University of Tsukuba jointly operate.
Oakforest-PACS has 8208 compute nodes, each of which consists of Intel
Xeon Phi 7250 processor, and Intel Omni-Path Architecture as an
interconnect. The computation was performed during the test operation
period. The main run and the verification run were each performed on
512 nodes. Due to the runtime limit for jobs, the main run and the
verification run were each performed in 200 steps.

Daisuke Takahashi
Center for Computational Sciences
University of Tsukuba
1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
E-mail: daisuke[at]cs.tsukuba.ac.jp