Multi-Core Scaling: Intel Xeon X5482 Harpertown
Multi-threaded Pi Benchmark: y-cruncher v0.5.4
By Alexander J. Yee
(Last updated: May 13, 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 |
|
| 2 threads |
|
| 4 threads |
|
| 8 threads |
|
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 x 3.2 GHz Intel Xeon - X5482 Harpertown
|
||||||
Memory: |
64 GB DDR2 - 800 MHz (quad channel)
|
||||||
Courtesy Of: |
Alexander Yee
|
||||||
Version: |
v0.5.4.9141 (x64 SSE4.1 ~ Nagisa)
|
||||||
Decimal Digits |
1 thread |
2 threads |
4 threads |
8 threads |
2-t scaling |
4-t scaling |
8-t scaling |
10,000 |
0.040 | 0.040 | 0.038 | 0.038 | 1.000 | 0.950 | 0.950 |
12,000 |
0.041 | 0.040 | 0.039 | 0.038 | 1.025 | 1.051 | 1.079 |
15,000 |
0.042 | 0.041 | 0.04 | 0.039 | 1.024 | 1.050 | 1.077 |
20,000 |
0.043 | 0.044 | 0.041 | 0.040 | 0.977 | 1.049 | 1.075 |
25,000 |
0.047 | 0.045 | 0.043 | 0.041 | 1.044 | 1.093 | 1.146 |
40,000 |
0.051 | 0.050 | 0.049 | 0.048 | 1.020 | 1.041 | 1.063 |
50,000 |
0.056 | 0.054 | 0.053 | 0.052 | 1.037 | 1.057 | 1.077 |
75,000 |
0.064 | 0.063 | 0.062 | 0.061 | 1.016 | 1.032 | 1.049 |
100,000 |
0.076 | 0.072 | 0.071 | 0.071 | 1.056 | 1.070 | 1.070 |
120,000 |
0.085 | 0.081 | 0.081 | 0.080 | 1.049 | 1.049 | 1.063 |
150,000 |
0.098 | 0.089 | 0.088 | 0.090 | 1.101 | 1.114 | 1.089 |
200,000 |
0.124 | 0.104 | 0.103 | 0.103 | 1.192 | 1.204 | 1.204 |
250,000 |
0.151 | 0.123 | 0.121 | 0.123 | 1.228 | 1.248 | 1.228 |
400,000 |
0.240 | 0.182 | 0.171 | 0.168 | 1.319 | 1.404 | 1.429 |
500,000 |
0.312 | 0.227 | 0.206 | 0.201 | 1.374 | 1.515 | 1.552 |
750,000 |
0.496 | 0.331 | 0.291 | 0.281 | 1.498 | 1.704 | 1.765 |
1,000,000 |
0.702 | 0.449 | 0.376 | 0.353 | 1.563 | 1.867 | 1.989 |
1,200,000 |
0.885 | 0.552 | 0.461 | 0.426 | 1.603 | 1.920 | 2.077 |
1,500,000 |
1.129 | 0.713 | 0.601 | 0.569 | 1.583 | 1.879 | 1.984 |
2,000,000 |
1.623 | 0.978 | 0.787 | 0.713 | 1.660 | 2.062 | 2.276 |
2,500,000 |
2.166 | 1.283 | 0.997 | 0.896 | 1.688 | 2.173 | 2.417 |
4,000,000 |
3.831 | 2.189 | 1.629 | 1.413 | 1.750 | 2.352 | 2.711 |
5,000,000 |
5.029 | 2.822 | 2.035 | 1.770 | 1.782 | 2.471 | 2.841 |
7,500,000 |
8.225 | 4.526 | 3.103 | 2.586 | 1.817 | 2.651 | 3.181 |
10,000,000 |
11.489 | 6.223 | 4.154 | 3.371 | 1.846 | 2.766 | 3.408 |
12,000,000 |
14.496 | 7.719 | 5.116 | 4.089 | 1.878 | 2.833 | 3.545 |
15,000,000 |
18.858 | 9.986 | 6.462 | 4.986 | 1.888 | 2.918 | 3.782 |
20,000,000 |
26.758 | 14.221 | 8.843 | 6.672 | 1.882 | 3.026 | 4.010 |
25,000,000 |
34.434 | 18.260 | 10.688 | 8.165 | 1.886 | 3.222 | 4.217 |
40,000,000 |
60.974 | 32.154 | 18.377 | 13.254 | 1.896 | 3.318 | 4.600 |
50,000,000 |
78.288 | 41.357 | 23.436 | 15.467 | 1.893 | 3.341 | 5.062 |
75,000,000 |
127.048 | 67.164 | 37.452 | 23.715 | 1.892 | 3.392 | 5.357 |
100,000,000 |
176.271 | 93.161 | 51.622 | 31.763 | 1.892 | 3.415 | 5.550 |
120,000,000 |
215.162 | 113.652 | 63.004 | 38.575 | 1.893 | 3.415 | 5.578 |
150,000,000 |
285.027 | 150.644 | 82.744 | 49.524 | 1.892 | 3.445 | 5.755 |
200,000,000 |
393.058 | 207.284 | 113.814 | 67.136 | 1.896 | 3.454 | 5.855 |
250,000,000 |
509.892 | 269.783 | 147.527 | 85.811 | 1.890 | 3.456 | 5.942 |
400,000,000 |
871.692 | 460.718 | 252.392 | 144.688 | 1.892 | 3.454 | 6.025 |
500,000,000 |
1,136.88 | 601.056 | 327.866 | 184.959 | 1.891 | 3.468 | 6.147 |
750,000,000 |
1,808.21 | 957.337 | 520.904 | 295.846 | 1.889 | 3.471 | 6.112 |
1,000,000,000 |
2,538.83 | 1,345.26 | 731.642 | 397.735 | 1.887 | 3.470 | 6.383 |
1,200,000,000 |
3,085.74 | 1,637.91 | 893.467 | 483.427 | 1.884 | 3.454 | 6.383 |
1,500,000,000 |
4,010.96 | 2,128.09 | 1,156.01 | 624.030 | 1.885 | 3.470 | 6.428 |
2,000,000,000 |
5,594.51 | 2,968.51 | 1,614.44 | 872.879 | 1.885 | 3.465 | 6.409 |
2,500,000,000 |
7,112.52 | 3,775.55 | 2,059.30 | 1,106.58 | 1.884 | 3.454 | 6.427 |
4,000,000,000 |
12,327.08 | 6,555.83 | 3,572.91 | 1,927.27 | 1.880 | 3.450 | 6.396 |
5,000,000,000 |
15,684.54 | 8,333.74 | 4,540.38 | 2,428.63 | 1.882 | 3.454 | 6.458 |
7,500,000,000 |
24,781.13 | 13,199.44 | 7,200.93 | 3,869.88 | 1.877 | 3.441 | 6.404 |
10,000,000,000 |
34,263.55 | 18,250.26 | 9,944.49 | 5,344.11 | 1.877 | 3.445 | 6.411 |
12,000,000,000 |
43,063.83 | 23,015.51 | 12,551.36 | 6,735.78 | 1.871 | 3.431 | 6.393 |
Back To: