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Old 2014-07-12, 19:43   #3
henryzz
Just call me Henry
 
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"David"
Sep 2007
Cambridge (GMT/BST)

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I had a 32-bit binary around so I gave it a whirl:
Code:
GMP-ECM 6.2.3 [powered by GMP 4.2.1_MPIR_1.1.1] [ECM]
(10^71-1)/9
Input number is (10^71-1)/9 (71 digits)
Using B1=1000000, B2=1045563762, polynomial Dickson(6), sigma=3673851391
Step 1 took 2714ms
Step 2 took 3370ms
64-bit
Code:
GMP-ECM 6.4.2 [configured with MPIR 2.5.1] [ECM]
(10^71-1)/9
Input number is (10^71-1)/9 (71 digits)
Using B1=1000000, B2=1045563762, polynomial Dickson(6), sigma=1986288319
Step 1 took 2153ms
Step 2 took 2184ms
Code:
GMP-ECM 7.0-dev [configured with MPIR 2.6.0, --enable-openmp] [ECM]
(10^71-1)/9
Input number is (10^71-1)/9 (71 digits)
Using B1=1000000, B2=1045563762, polynomial Dickson(6), sigma=1:12988648
Step 1 took 1779ms
Step 2 took 2168ms
Around a 1.5x speedup for 64-bit but it is also an older ecm and mpir. This is on a Q6600
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