[abombss]

I posted a thread yesterday on the AMD board realizing that it should have to gone to SMP and I am now appealing to your knowledge.

http://forum.oc-forums.com/vb/showth...hreadid=101245

I just checked my L5 bridges and they are unlocked for SMP mode. As I stated in my previous post I am not getting any multithreading capability. I was compiling KDE with a -j2 option on make and the CPU never went over 50% ( SMP compiled into the kernel ). Likewise I did some compiling and benchmarking in Win XP with Visual C++ and MySql. The CPU never went over 50%.

The bios picks up two XP 1800s. I ran 3dmark bench and it report two XP / MP cpus. Win XP reports Athlon MP 1800.

Anyone have any ideas how to get SMP and multithreading working? Or has anyone else noticed this problem. Maybe I am just not using multithreaded programs.

Surely I figured VS C++ 6.0 Enterprise and MySql are multi threaded?

I can utilize both CPUs running seperate tasks, ie. When compiling KDE I ended up starting folding which boosted my CPU to 100% usuage.


thanks,

abombss

Asus A7m266-d
2x Amd XP 1800+

[Jon]

Well, 3DMark isn't multithreaded so it will be useless there. As far as VS C++ and MySQL, they are multithreaded but you're going to have to find a way for these programs to be stressed to a full load point. If they are only using enough CPU time to stress one CPU, it's only going to use one CPU.

Also, you say it is showing 50% usage, is this on one CPU or both? If both are showing 50% load then this is perfectly normal. It doesn't sound as if anything is wrong if both CPUs are being used when multitasking.

[abombss]

To stress the system, I ran a cartesian product query in MsSql which was using over 2 trillion rows. The MySql process maxed out at 50% CPU load spread across each CPU. There was 25% usuage on each CPU ( roughly ). It stayed at a constant 50% for over 20 minutes.

To stress the system on Linux I did a build for KDE. KDE is huge, it took almost 4 to 6 hours to complete. Again the make process never went over that 50% threshold.

When I refer to 50% I mean individual process usuage in relation to total CPU capacity. Shouldn't a multithreaded process be able go beyond the 50% threshold?

Has anyone else out there had a single process use over 50% total CPU usuage, if so what application. Or does SMP not allow a process to take more than 50% usuage?

abombss

[Zelda Compost]

I use gkrellm to view my cpu usage on my SMP rig. It shows both CPU's independantly, which I am guessing is what you are looking for.

Top shows 50% because you are only pegging one processor. Run two procs and you'll see 100%.

...or just use gkrellm and you can see both cpu's by themselves.

...Z

[abombss]

You can use top with -C option ( I think thats it ) and it will show two CPU's as well as system total.

Just to note, I am not always just looking at CPU usuage, I am looking at the actual process and its COU usuage in relation to the total CPU usuage.

Has anyone run 1 instance of a program that uses more than 50% total CPU resources? If so, what app was it?

Example, Folding is not multi-threaded, therefore to get the most work done on dual rigs you need 2 seperate processes running. Each process consumes 50% of the toal CPU resources, yielding 100% CPU usuage. If just 1 instance of folding were running, CPU usuage would be spread some what equally across each CPU for total of 50% usuage.

I would like find and test some program which can give me over 50% CPU usuage for a single multi-threaded process. I thought MySql did this... In my case it did not.

abombss

[res0r9lm]

try CliBench mk III smp 0.7.15

[abombss]

Thanks, just ran it. I choose two threads and I was able to see 100% CPU usuage with just 1 process running.

At least I know the CPU's are able to multi-thread now. I just have to go back and dig for some info about getting some of these other apps optimized for multi-threaded running.

I appreciate all the help...

abombss

[res0r9lm]

thats good. I just remembered that quake will do smp also