mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Software

Reply
 
Thread Tools
Old 2021-10-30, 06:11   #1
bur
 
bur's Avatar
 
Aug 2020
79*6581e-4;3*2539e-3

58310 Posts
Default pfgw factorial testing too slow?

I had done some factorial prime testing with PRPnet with i5 and i3 CPUs before and a test took about 25-30 hours.

Now recently I began testing using an i10-10900k and a test in the 282000! range takes more than 40 hours. I have no idea why.

FFT is about 450k, it's a 10 core with 20 MB L3 cache, I'm running 10 tasks simultaneously. It's not ideal, but better L3/task ratio than on the other computers.

It's running Ubuntu. I tried different pfgw versions, the one supplied with the PRPnet client (3.7.10) and also 4.0.1 from sourceforge. No difference.

Each pfgw instance is using 99-100% of a core. Total RAM usage is 1GB/16GB. I used that same computer for yafu and cado and never had any issues with slow speeds.
bur is offline   Reply With Quote
Old 2021-10-30, 06:24   #2
axn
 
axn's Avatar
 
Jun 2003

5,387 Posts
Default

Quote:
Originally Posted by bur View Post
a test took about 25-30 hours.
It would be helpful if there was some indication of the sizes of the numbers being tested when you were getting the above timings.

For example, n=280k ought to take appr. 35% more time compared to n=250k (based on naive scaling calculations) on the same CPU. Of course, it would be worse, since the impact of large L3 will be less when you have bigger FFT.
axn is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Linear Congruence order 4 sequence not testing in PFGW? carpetpool Software 14 2017-07-13 19:54
Efficient testing in Pfgw Trejack Information & Answers 2 2016-04-30 05:30
PFGW 3.3.6 or PFGW 3.4.2 Please update now! Joe O Sierpinski/Riesel Base 5 5 2010-09-30 14:07
Factorial mfgoode Puzzles 6 2007-07-24 14:24
Primality-testing program with multiple types of moduli (PFGW-related) Unregistered Information & Answers 4 2006-10-04 22:38

All times are UTC. The time now is 07:47.


Mon Aug 15 07:47:56 UTC 2022 up 39 days, 2:35, 1 user, load averages: 0.99, 1.07, 1.12

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.

≠ ± ∓ ÷ × · − √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 𝖕 𝖖 𝖗 ⊲ ⊳
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣ … ⋯ ⋮ ⋰ ⋱
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎𝜍 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔