mersenneforum.org  

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

Reply
 
Thread Tools
Old 2017-12-18, 15:59   #1
vasyannyasha
 
vasyannyasha's Avatar
 
"Vasiliy"
Apr 2017
Ukraine

6010 Posts
Default LLR can't find all L1 cache

I have AMD Athlon X4 860K with L1=16*4+96*2=256 KB
But LLR write
L1 cache size : 16 KB
Could somebody explain this?
pre-thanks
vasyannyasha is offline   Reply With Quote
Old 2017-12-18, 16:30   #2
VBCurtis
 
VBCurtis's Avatar
 
"Curtis"
Feb 2005
Riverside, CA

19×223 Posts
Default

In your calculation shown, what label does 16 have? What label does 96 have? (For example, instruction cache or data cache)

Why do you multiply by 4 or 2?

Finally, now that you've labeled those items, why would a program only note one of the 16s, and none of the 96s?

I wager you'll learn a fair bit about what cache does when you read about the answers to these questions.
VBCurtis is offline   Reply With Quote
Old 2017-12-18, 16:56   #3
vasyannyasha
 
vasyannyasha's Avatar
 
"Vasiliy"
Apr 2017
Ukraine

22×3×5 Posts
Default

L1 D(Data?)=16KB *4
L1 I(intsructions?)=96KB*4
vasyannyasha is offline   Reply With Quote
Old 2017-12-18, 21:13   #4
VictordeHolland
 
VictordeHolland's Avatar
 
"Victor de Hollander"
Aug 2011
the Netherlands

22308 Posts
Default

L1 is not shared between cores, so why multiply it by 4 (cores)?
VictordeHolland is offline   Reply With Quote
Old 2017-12-18, 21:30   #5
kladner
 
kladner's Avatar
 
"Kieren"
Jul 2011
In My Own Galaxy!

2·7·709 Posts
Default

Quote:
Originally Posted by vasyannyasha View Post
I have AMD Athlon X4 860K with L1=16*4+96*2=256 KB
But LLR write
L1 cache size : 16 KB
Could somebody explain this?
pre-thanks
P95 and CPUZ report a 6700K as L2=256K. My understanding is that this value is 'per core'. With my previous AMD '8 core' CPU, I think P95 reported L2 per '2-ALU + 1 FPU' unit.
kladner is offline   Reply With Quote
Old 2017-12-19, 00:15   #6
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

2×3×7×167 Posts
Default

Quote:
Originally Posted by vasyannyasha View Post
I have AMD Athlon X4 860K with L1=16*4+96*2=256 KB
But LLR write
L1 cache size : 16 KB
Could somebody explain this?
Don't worry about it. If LLR is mis-reporting cache sizes it will not affect its operation.
Prime95 is offline   Reply With Quote
Old 2017-12-19, 07:18   #7
vasyannyasha
 
vasyannyasha's Avatar
 
"Vasiliy"
Apr 2017
Ukraine

6010 Posts
Default

Cpu-Z write
L1-D=16Kb*4
L1-I=96Kb*2(in previous message i wrote 96Kb*4. Sorry, my mistake. In first message everything is right)
L2=2048Kb
So L2 per core=2048/4=512Kb

Last fiddled with by vasyannyasha on 2017-12-19 at 07:19 Reason: About mistake in previous message
vasyannyasha is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where can I find a Reverse and Add program? I can't find any! Stargate38 Programming 18 2015-07-10 06:08
recognizing only 4MB of 8MB L2 cache Dabigley13 Information & Answers 4 2015-05-08 07:45
8k fft and L2 cache pman Information & Answers 1 2012-05-23 14:00
L2 cache question Longshot Hardware 5 2005-10-26 23:55
L3 cache. What could it buy us? nomadicus Hardware 3 2003-08-09 22:23

All times are UTC. The time now is 09:05.

Sat Aug 8 09:05:12 UTC 2020 up 22 days, 4:51, 1 user, load averages: 2.05, 2.11, 2.04

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, 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.