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>
> Hi,
>
> Michael asked which kind threads one should prefer;
>
> we did a very simple experiment using the IBM JIT and the blackdown JDK in two
> absolutely indentical environments (the same computers and so on). What we
> firgured out was the following:
>
> it took the blackdown JDK 8000 milis to display the servlet (it did something
> like 100 million multiplications ...), the IBM JIT did the same in 500 milis
> (no, I didnt mess up the zeros ;-) )
>
> Well this means the IBM JIT is 16 times faster? At least it's faster. Concerning
>
> the native thread/green thread thing:
>
> IBM uses native threads -this could be much faster because the whole
> multithread-thing on linux isn't that perfect like multiprocessing? This means,
> Linux is great in handling lots of processes, only good in handling threads, I
> would think.
> What is even more intresting is the fact that more and more multiprocessor
> machines become available - this could mean, that the 'pseudo processes' IBM JIT
>
> produces are much more easyer to handle for the OS than the loadbalancing using
>
> green threads.
>
> Well, thats what we found out with 'quick benchmarking' ;-)
>
> Cheers,
>
> Rupert
We've been looking at the same compiler. On a P100 it outperformed
blackdown on a dual P2-450. (not indepth testing though so suss).
However, I`m currently running JServ on the machine and under top
and ps commands it claims that there are 7 java processes, each
using the exact same amount of memory. Which obviously worried us
as this was 42 meg combined on a machine with 48 meg mem.
However, the total free memory seems to only change by 6 Meg.
Each process quite nicely links to what threads we expect to
be existing.
So any idea why ps/top are 'getting it wrong'?
Hen
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