Which file has the cache information?

longli · 04-10-2011, 01:44 PM

Hi, guys:

I have a machine which has L1,L2 and L3 cache. I just would like to ask how can I get each level cache's cycles/latency information?

Also, can anyone suggest me some good profile tools that can capture each level cache miss/access number when running a program?

BTW, my machine has AMD cpu, and run on Ubuntu system.

Thanks

DavidMcCann · 04-11-2011, 11:29 AM

Run dmidecode as root. That will give you the BIOS data. So I have

Processor Information
L1 Cache Handle: 0x0005
L2 Cache Handle: 0x0006
L3 Cache Handle: Not Provided

and looking down, I find

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
Installed Size: 126 kB

and similarly for handle 0x0006.

longli · 04-11-2011, 11:39 AM

Thanks for your reply. But why the speed is unknown?

Handle 0x0702, DMI type 7, 19 bytes
Cache Information
Socket Designation: Not Specified
Configuration: Enabled, Not Socketed, Level 3
Operational Mode: Write Back
Location: Internal
Installed Size: 10240 KB
Maximum Size: 10240 KB
Supported SRAM Types:
Unknown
Installed SRAM Type: Unknown
Speed: Unknown
Error Correction Type: Multi-bit ECC
System Type: Unified
Associativity: Other

Quote:

Originally Posted by DavidMcCann

Run dmidecode as root. That will give you the BIOS data. So I have

Processor Information
L1 Cache Handle: 0x0005
L2 Cache Handle: 0x0006
L3 Cache Handle: Not Provided

and looking down, I find

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
Installed Size: 126 kB

and similarly for handle 0x0006.

DavidMcCann · 04-12-2011, 10:32 AM

There are quite a few gaps like that, as you can see. I suppose it's just a question of what the author of the BIOS found it easy to get or considered useful. Incidentally, I got the command from this document, which is worth having:
http://toolbox.mirror.linux.kg/