bhavv, with 5120MB memory size in Linx and 4.5ghz, it should take less than an hour to do 20 loops. Do it when you're watching tv, or when you eat dinner or something. It's not long at all.
Also, what you're doing by running all those stress programs at once is overloading your cpu resources. Most notably this causes cache trashing and significant cache misses, which result in bus flushes. This lowers your overall system stress significantly, as the CPU wastes an enormous number of cycles flushing the bus over and over. So in short, running all of them together is WORSE stress testing than running a single one by itself.
At that problem size, your GFlops are fine. However, you're not fully stressing your CPU. Drop your problem size to 9216MB and re-test. You should be hitting 70+Gflops.
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