performance?

Hi Everyone,

I know I have asked this sort of thing before, but I'm doing c++ this semester and as such I have been using the hppa box (715/64) wiht 128 meg ram as my "dev" box.

Compiling and running of a program that finds perfect numbers upto 10000 is somewhat slow.. but that's ok..

It wasn't until I compiled it on my p90 with 48 meg ram running a a zillion services and daemons that I noticed just how slow the 715 is. Running the program proved this even further.

I thought the 715/64 was about similar in performance.. but this simple observation shows this not to be the case.

As a webserver the 715 is fine... but I'm now thinking that when these exercises and assignments start getting bigger that the 715 will be just a little too slow for my liking. This isn't a bad thing.. just an observation...

Regards,

Pete.

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Would you mind posting some numbers?

Also, let's try to figure out what other variables are a factor. Can you compare gcc-3.0 on your x86 to the current compiler?

Revolutions do not require corporate support.

The p90 system is an old stock install of redhat 6.0 with very little done to the kernel.. it was recompiled with certain drivers built into the kernel but that's about it.

[pete@piglet brad]$ g++ --version
egcs-2.91.66

The program is fairly simple in what it does.

I really don't want to install gcc-3.0 on this system as it really is a stable workhorse and I'd rather not break.

But even running time is somewhat of a difference... lets see:

This is a very simple shell script that outputs date at start and finish of the program running.. I'm no guru really.. :)

Run on HPPA 715/64

Wed Mar 27 18:02:20 EST 2002
Wed Mar 27 18:02:50 EST 2002

Run on P90

Wed Mar 27 18:00:32 EST 2002
Wed Mar 27 18:00:39 EST 2002

Just quickly you can see that it took 7 secs to do the same thing on the p90 and 30 seconds on the hppa box.

The p90 runs alot of daemons, substantially more than the hppa box.. but this is a surprise.. I have some thoughts about the compiling, but none what so ever about the general difference between the arches...

I just thought it was of interest as I thought the hppa box was of similar processing capability to the p90.

Regards,

Pete.

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FYI, on a 715/75 I run SETI@home and was able to process 4 units at an average rate of ~99 hours/unit. Currently, I'm using a 715/80, but it doesn't look to be doing much better.

     Rafael

This is the crux of the problem. IA32 glibc and kernel are sprinkled with copious amounts of hand tuned and optimized assembly. We are nowhere near that level yet :)

What is it that your program does?

Like the beowulf.org people say:
"Your application is always the best benchmark."

Cheers,
Carlos.

I thought that the i386 may hvae some performance tweaks in it, since this is by far the most used platform for development.

Nothing special, it's just an exercise in programming. It searches for perfect numbers and then prints out the prime number in the list of factors.

It's not very big, so if you want to take a look, I'll email it to you.. :)

Regards,

Pete.

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				this signature will remain 
				under construction indefinately.