Multi-Core Scaling: Intel Core 2 Quad Q6600
Multi-threaded Pi Benchmark: y-cruncher v0.5.3
By Alexander J. Yee
(Last updated: May 25, 2010)
- The faded lines show the CPU Utilization as defined by the # of CPU cycles that were used.
- The darker lines show the actual speedup itself.
- Discrepancies between these values are believed to be caused by multi-threading overhead and resource contention (especially with memory bandwidth).
Benchmark Settings
| Mode: | Ram Only |
| Algorithm: | Chudnovsky Formula |
| Priority: | Above Normal |
| 1 thread |
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| 2 threads |
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| 4 threads |
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Benchmarks
All times in seconds. All times include base-conversions.
Note that when comparing these benchmarks to that of previous versions of y-cruncher, it appears that multi-core scaling is worse in newer versions.
This is because y-cruncher is limited by memory bandwidth on this system.
As y-cruncher gets faster due to optimizations, it needs more bandwidth. Therefore, newer versions of y-cruncher are more bottlenecked by memory bandwidth than previous versions.
Processor(s): |
2.4 GHz Intel Core 2 Quad - Q6600 Kentsfield
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Memory: |
6 GB DDR2 - 800 MHz (dual channel)
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Courtesy Of: |
Alexander Yee
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Version: |
v0.5.3.9134 (x64 SSE3)
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Decimal Digits |
1 thread |
2 threads |
4 threads |
2-t scaling |
4-t scaling |
10,000 |
0.032 | 0.037 | 0.031 | 0.865 | 1.032 |
12,000 |
0.037 | 0.042 | 0.037 | 0.881 | 1.000 |
15,000 |
0.035 | 0.042 | 0.036 | 0.833 | 0.972 |
20,000 |
0.041 | 0.044 | 0.039 | 0.932 | 1.051 |
25,000 |
0.047 | 0.047 | 0.041 | 1.000 | 1.146 |
40,000 |
0.053 | 0.053 | 0.046 | 1.000 | 1.152 |
50,000 |
0.060 | 0.051 | 0.054 | 1.176 | 1.111 |
75,000 |
0.072 | 0.070 | 0.065 | 1.029 | 1.108 |
100,000 |
0.087 | 0.084 | 0.073 | 1.036 | 1.192 |
120,000 |
0.104 | 0.097 | 0.091 | 1.072 | 1.143 |
150,000 |
0.121 | 0.109 | 0.101 | 1.110 | 1.198 |
200,000 |
0.162 | 0.135 | 0.126 | 1.200 | 1.286 |
250,000 |
0.201 | 0.163 | 0.154 | 1.233 | 1.305 |
400,000 |
0.346 | 0.260 | 0.239 | 1.331 | 1.448 |
500,000 |
0.447 | 0.319 | 0.278 | 1.401 | 1.608 |
750,000 |
0.730 | 0.505 | 0.457 | 1.446 | 1.597 |
1,000,000 |
0.999 | 0.667 | 0.566 | 1.498 | 1.765 |
1,200,000 |
1.272 | 0.838 | 0.710 | 1.518 | 1.792 |
1,500,000 |
1.674 | 1.063 | 0.887 | 1.575 | 1.887 |
2,000,000 |
2.311 | 1.419 | 1.123 | 1.629 | 2.058 |
2,500,000 |
3.059 | 1.875 | 1.486 | 1.631 | 2.059 |
4,000,000 |
5.396 | 3.108 | 2.284 | 1.736 | 2.363 |
5,000,000 |
7.007 | 3.869 | 2.888 | 1.811 | 2.426 |
7,500,000 |
11.399 | 6.164 | 4.179 | 1.849 | 2.728 |
10,000,000 |
15.928 | 8.542 | 5.286 | 1.865 | 3.013 |
12,000,000 |
20.196 | 10.814 | 6.626 | 1.868 | 3.048 |
15,000,000 |
26.212 | 13.962 | 8.357 | 1.877 | 3.137 |
20,000,000 |
36.982 | 19.617 | 11.462 | 1.885 | 3.226 |
25,000,000 |
47.557 | 25.174 | 14.582 | 1.889 | 3.261 |
40,000,000 |
83.781 | 44.184 | 24.662 | 1.896 | 3.397 |
50,000,000 |
107.631 | 56.700 | 31.352 | 1.898 | 3.433 |
75,000,000 |
173.181 | 91.369 | 49.981 | 1.895 | 3.465 |
100,000,000 |
242.114 | 127.410 | 68.951 | 1.900 | 3.511 |
120,000,000 |
299.028 | 157.364 | 84.906 | 1.900 | 3.522 |
150,000,000 |
391.652 | 206.266 | 110.803 | 1.899 | 3.535 |
200,000,000 |
544.318 | 285.694 | 152.506 | 1.905 | 3.569 |
250,000,000 |
705.029 | 371.072 | 199.949 | 1.900 | 3.526 |
400,000,000 |
1,206.39 | 638.021 | 338.634 | 1.891 | 3.563 |
500,000,000 |
1,569.18 | 825.634 | 440.989 | 1.901 | 3.558 |
750,000,000 |
2,510.61 | 1,317.12 | 703.260 | 1.906 | 3.570 |
1,000,000,000 |
3,520.64 | 1,863.26 | 990.047 | 1.890 | 3.556 |
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