Perft(14) Weekly Status Report

[sje]

Perft(14) Weekly Status 2014-10-26

There are more than 2,500,000 perft(7) results so far, about 2.59% of the 96,400,068 needed.

Day count: 79
Average throughput: 31,646 results/day

Completed work units (26): 000-006, 008-020, 022, 024-027, 964
In progress (7): 007, 021, 023, 028-031
Not yet started (932): 032-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
007  40.6%  serra
021  55.0%  joni
023  74.5%  megan
028  16.9%  rocky
029  52.0%  kristen
030  43.5%  amanda
031   9.2%  cynthia

--------

Several problems were seen in the past week or so: a disk gone bad, some memory gone bad, and a Mac OS/X upgrade gone bad. Also, there's been no time to work on Oscar.

Oscar needs to get running in OpenCL mode to get a better progress rate. Otherwise, the projected completion date using Symbolic alone remains about eight years away.

[sje]

Perft(14) Weekly Status 2014-11-02

There are more than 2,600,000 perft(7) results so far, about 2.70% of the 96,400,068 needed.

Day count: 86
Average throughput: 30,233 results/day

Completed work units (27): 000-006, 008-020, 022, 024-027, 029, 964
In progress (7): 007, 021, 023, 028, 030-032
Not yet started (931): 033-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
007  60.4%  serra
021  64.9%  joni
023  98.6%  megan
028  86.7%  rocky
030  91.2%  amanda
031  26.0%  cynthia
032   1.9%  kristen

--------

More hardware failures this week: my Apple AirPort wireless router conked out, the third to do so. I had a spare; an older model with a bit less functionality. I now have a new, pretentiously named, AirPort Extreme Base Station which seems to be working. Its shape is a mini tower and will be a disappointment to my cat who liked to sit on the old, flat AirPort to soak up the heat.

Twelve years ago, I had the only wireless network among the nearby homes. Now, there are about a dozen, and that's not counting any with hidden SSIDs. At least most seem to be running automatic channel selection to avoid collisions. Things must be more difficult in a large apartment building, and also in large college dormitories where students are allowed to have their own wireless routers.

I might have been better off with a non Apple wireless router from Belkin or NetGear or maybe some other manufacturer, with a lower price or with even more functionality. But I am lazy and didn't want to spend much time fooling with installation and configuration issues. In particular, I didn't want to mess with a Windows-only installer when my only Windows machine, an HP notebook, broke last week and refuses to boot for unknown reasons.

I have to fix the HP someday, because it's the only machine which can run the software to connect to my DGT piece recognition chessboard. It's too bad that the warranty expired just last month.

There is some slightly scary news with using OpenCL, needed by Oscar in OpenCL mode, on some Apple hardware. It seems that some Macs have heat related failure with the lead-free solder used to connect certain discrete graphic processor chips. The solder joints fail after the GPU runs long and hot, and a program like Oscar will run a GPU as hard or harder than any other task. Even if this doesn't affect my Mac, it might affect someone's, and that's not good.

[wgarvin]

There is some slightly scary news with using OpenCL, needed by Oscar in OpenCL mode, on some Apple hardware. It seems that some Macs have heat related failure with the lead-free solder used to connect certain discrete graphic processor chips. The solder joints fail after the GPU runs long and hot, and a program like Oscar will run a GPU as hard or harder than any other task. Even if this doesn't affect my Mac, it might affect someone's, and that's not good.

Oh god. That's the same thing that happened to Microsoft with their first-run Xbox 360's. The motherboards would warp slightly from the heat, cracking the ball-grid-array solder joints of the CPU/GPU package. It was one of the leading causes of the dreaded "Red Ring of Death" that killed so many Xbox 360's and forced Microsoft to extend their warranty from 1 year to 3 years, at a cost of over a billion dollars.

I myself am on my fourth Xbox 360 since 2007. The first two died of heat exhaustion (RROD) after about 1 year each, and the third one would eventually have suffered the same fate, if its DVD drive had not failed first!

[sje]

http://www.macrumors.com/2014/10/28/mac ... s-lawsuit/

The problem has occurred with other Mac notebook models.

[sje]

Perft(14) Weekly Status 2014-11-09

There are more than 2,900,000 perft(7) results so far, about 3.01% of the 96,400,068 needed.

Day count: 93
Average throughput: 31,183 results/day

Completed work units (30): 000-006, 008-020, 022-030, 964
In progress (7): 007, 021, 031-035
Not yet started (928): 036-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
007  86.8%  serra
021  83.1%  joni
031  45.2%  cynthia
032  36.5%  kristen
033  10.1%  megan
034  33.2%  amanda
035  19.7%  rocky

[sje]

Perft(14) Weekly Status 2014-11-16

There are more than 3,000,000 perft(7) results so far, about 3.11% of the 96,400,068 needed.

Day count: 100
Average throughput: 30,000 results/day

Completed work units (31): 000-020, 022-030, 964
In progress (8): 021, 031-037
Not yet started (926): 038-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
021  96.6%  joni
031  70.2%  cynthia
032  73.9%  kristen
033  22.4%  megan
034  66.5%  amanda
035  49.3%  rocky
036  19.8%  gail
037  19.0%  serra

[sje]

Perft(14) Weekly Status 2014-11-23

There are more than 3,300,000 perft(7) results so far, about 3.42% of the 96,400,068 needed.

Day count: 107
Average throughput: 30,841 results/day

Completed work units (34): 000-030, 032, 034, 964
In progress (8): 031, 033, 035-040
Not yet started (923): 041-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
031  85.9%  cynthia
033  35.7%  megan
035  77.7%  rocky
036  43.3%  gail
037  71.1%  serra
038   8.0%  joni
039  20.2%  kristen
040   9.6%  amanda

[sje]

Perft(14) Weekly Status 2014-11-30

There are more than 3,600,000 perft(7) results so far, about 3.73% of the 96,400,068 needed.

Day count: 114
Average throughput: 31,579 results/day

Completed work units (37): 000-032, 034-035, 037, 964
In progress (9): 033, 036, 038-044
Not yet started (919): 045-963

Work units in progress:

Code: Select all

WU#  Comp%  Machine
---  -----  -------
033  35.5%  megan
036  63.2%  gail
038  18.5%  joni
039  63.9%  kristen
040  53.0%  amanda
041   5.5%  melissa
042  17.5%  serra
043  11.6%  rocky
044   2.8%  cynthia

[sje]

Some records:

There are now more than 3,700,000 perft(7) results so far for the 96,400,068 unique(7) positions.

The position with the greatest perft(7) result (271,464,002,812) so far is:
[d]rnb1k1nr/pppp1pp1/3bp3/6q1/4Q3/4P3/PPPP1PPP/RNB1KBNR b KQkq - 2 4[/d]

The position with the greatest perft(7) product of sums (2,600 * 44,948,569,301 = 116,866,280,182,600) is:
[d]rnbqkbnr/pppp1ppp/8/4p3/3PP3/8/PPP2PPP/RNBQKBNR b KQkq - 2 4[/d]
The above record is unlikely to be surpassed.

There are many checkmates, so the least perft(7) result is zero.

[EvgeniyZh]

There are more than 3,600,000 perft(7) results so far, about 3.73% of the 96,400,068 needed.

Day count: 114
Average throughput: 31,579 results/day

Does that mean that you'll need about 6-9 years to finish?