Keith Devens .com

Moshe Bar answers questions

Slashdot: Moshe Bar on Programming, Society, and Religion. I found this part about database clustering most interesting.

There have been talks with the DB2, Postgres, SAP DB and various other DB technologies. All their proprietary clustering technologies (in particular DB2's and Oracle RAC's) are bound to show very poor scalability and TOC. In the openMosix model, you install one DB2 or one Oracle 9i on one machine and - assuming we have finished implementing Distributed Shared Memory, something which we plan to do - then the processes making up an instance can migrate away to other nodes and make more room for a larger DB block caching area. All that happens transparently to the RDBMS under openMosix because we implement the clustering layer within the kernel and therefore all applications, whatever they might be, benefit from it.

Under Oracle RAC, for example, you need to install the RDMBS on everynode being part of the RAC cluster. If you need to apply a patch and that process takes, say, 2 hours, then the whole patching downtime to the DB will be 2 hours x n nodes. Also, in openMosix we are soon goin to implement Dolphin support, allowing us to copy a full 4KB page from node to node within 14.4 microseconds. Something like Oracle will immediately benefit from the cluster-wide ultra-low latency. If not in kernel space, then every application vendor would have to write his own driver, possibly conflicting with other applications trying to do the same on the same machine. In short, doing clustering at the DB application level is essentially flawed.

Network RAM is simply allowing mallocs or swap-outs to be done to the RAM of neighboring cluster node rather than to physical swap space on disk. In order to run databases under openMosix we will need to implement distributed shared memory. Due to the exceptional complexity of this project, I do not assume to have a valid implementation before the end of 2004.

And most distressing:

I am studying law because at my age I already see how much faster younger programmers are than me. Back when I was in my early twenties nobody could beat me at programming. Nowadays, when I sit next to people like Andrea Arcangeli, I realize that programming, too, (even considering the advantage of experience) is for the young. Perhapes extreme programming, ie good quality, high speed programming, should be considered a sport and not an art or science or a skill. Since, I do not see myself being a programmer at 60 years (which is more than years from now), I deduced that I have to find a new job between then and now. Law is something that really goes well with progressing age.

And see discussion about the above, and one more.

I won't touch the comments about religion and "G-d". Nothing new or interesting in what these people have to say

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