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[Sedat Canbaz]

More Hyper-Threading Benchmarks,but this time with Houdini 2.0c x64 PRO
Note also that with respect to all,i used Houdini (instead of Hiarcs),due to Houdini solves the current mate much faster
Plus i can't spend more efforts and also i have no much more free time ...
Thanks in advance for your understanding !

BTW,i have installed Windows 8 Preview,but unfortunately Auto232 com driver did not work
So for the current HT benchmarks has been used Windows Vista Ultimate 64-bit
Another very stable and highly recommended operating system for chess (i like it very much)

Conditions:
------------
i7 980X @4.33GHz
Windows Vista Ultimate 64-bit
Lage Pages ON
128 MB Hashtable


1) Houdini 2.0c HT OFF 6 physical cores

44s
21s
44s
25s
42s
31s
42s
46s
27s
59s
---
Note:
Houdini 2.0c HT OFF 6 Cores solves the mate average in 38s

***********************************

2) Houdini 2.0c HT ON 12 Threads

45s
41s
42s
23s
26s
68s
43s
32s
42s
46s
---

Note:
Houdini 2.0c HT ON 12 Threads solves the mate average in 41s

***********************************

3) Houdini 2.0c HT ON 6 Threads (100 % CPUs usage)

44s
69s
61s
89s
29s
86s
18s
92s
67s
---
Some Notes:
Houdini 2.0c HT ON 6 Threads solves the mate average in 61s
Houdini 2.0c 6T has been tested,when other (Hiarcs 13.2 6T) engine was thinking
In other words:All Computer's 12 CPUs usage was 100 %

*******************************************

4) Houdini 2.0c HT ON 6 Threads (50 % CPUs usage)


59s
46s
65s
29s
38s
19s
44s
68s
62s
25s
---
Some Notes:
Houdini 2.0c HT ON 6 Threads solves the mate average in 45s
Houdini 2.0c 6T has been tested with 6 CPUs,i mean rest 6 CPUs were on idle
In other words:Houdini's during thinking process,there was no any other engine
******************************************

Final Words about 12 Threads and 6 Physical cores:
Chess speed difference between HT ON and HT OFF is approx.5-10 % in favor for Hyper Threading Disabled
And in my estimation,the elo difference will be approx.10 ELO in favor for HT OFF too
Lets see...How HT will be performed in SCCT Auto232 Rating List


Download all HT benchmarks (including Mate 11 position):
http://www.sedatcanbaz.com/chess/games/ht_speed_test.rar

Best Wishes,
Sedat