450 streaming clients, 3 machines and 3 Gb NICs

So I built this thing called run.pl to run N simultaneous instances of a command. To use it, you type run.pl N the_command_you_want_to_run_N_times_simultaneously So if I want to run 10 uname’s on my laptop … Viewed 18359 times by 2991 viewers

Stream this … no … really …

Ok. I asked for pointers to free as in Libre video. Stuff we can use for testing streaming performance. And load the JackRabbit system, with multiple clients pulling these videos. So first you need a video server. Well, IIS can do it in windows, but as I have discovered, Apache 2.2.9 does a somewhat better […]

… and a quick bonnie session (still untuned)

Again, 24 drive bay JackRabbit storage system. Version 1.03 ——Sequential Output—— –Sequential Input- –Random- -Per Chr- –Block– -Rewrite- -Per Chr- –Block– –Seeks– Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP jrs8 32088M 511057 49 228336 35 1046117 91 514.5 0 ——Sequential Create—— ——–Random Create——– -Create– –Read— -Delete– -Create– –Read— […]

Trial run of JackRabbit-M

Now that I have run through the 32 bit windows portion of the benchmark for the customer, I want to compare to our default way of shipping the units. So I fired up our default CF load, rebuilt the RAID. Simple little test runs, nothing to see here (no tuning yet) Viewed 16548 times by […]

W2k3 impressions day 2

Ok, now I know why Microsoft has been working so hard on W2k8. Because W2k3 doesn’t scale well under load. Using our test rigs, and the apache “ab” program, we can see *huge* differences in the same hardware (literally the same, simply swapping out boot drives), between W2k8 and W2k3, with the latter barely about […]

W2k3 vs W2k8 first impressions

W2k8 was not hard to install. Actually it was almost easy. Administration wasn’t hard. Most things went right on. Performance was ok. W2k3 was a royal pain to install, and I am not done yet. Administration … well, between the network adapters which, after being told to use a fixed IP address seem to still […]

Figured out the BSOD for W2k3 Server

This was annoying. Let the record show that W2k3 server doesn’t grok AHCI. So if you are trying to install it and it BSODs on you, turn off AHCI and redo your boot drive config in bios. Yeah, you give up performance, and a better interface. But it will boot now, without crashing. Viewed 13441 […]

JackRabbit too fast for windows …

… or there is a bug in the performance monitor. While I would like to believe the former (that JackRabbit is too fast), the latter is likely true. Look at this image, and then see the highlighted second image. Discussion in a moment. and Viewed 15907 times by 3054 viewers

“But you can’t do that!”

About 3 years ago, I was at a Sun HPC consortium meeting, where there was excitement over the possibility of getting 1TFLOP into 2.5 racks with an ultra-dense server. This was cool. It was awesome. One of the conference organizers was talking to me about this, saying it was the densest possible system (at that […]