Re: get CPU info, RAM info
On 16-04-2010 09:07, Eric Sosman wrote:
On 4/15/2010 5:35 PM, Mike Schilling wrote:
[...]
VMS also supports files that are not simply lists of bytes, including
both
the simple case of sequential files with defined record lengths and
the more
complex one of indexed files. In neither of these does seeking to an
arbitrary byte offset make sense.
Long ago when I worked with VMS, it supported three "file
organizations:" Sequential, Random, and Indexed.
No - it is: sequential, relative and indexed.
Random access (as opposed to sequential access) is
possible to all file organizations.
> Of these, only
Sequential fit into the I/O model (or straitjacket) adopted by C
and later by Java.
As the only language (of those that I know) on VMS then
C IO only has full support for sequential files. Of course
access to the other organizations are possible using
VMS specific libraries.
And yes Java inherited that - and using the VMS libraries
requires use of JNI (I have a nice lib for indexed
files if anyone is interested).
Next time someone asks "How can I delete some data in the
middle of a big file?" and you answer "Copy the whole file but
omit the doomed data," consider that VMS' Random and Indexed
organizations support delete-in-the-middle directly (for suitable
notions of "middle"). I mention this for the benefit of anyone
who might think it "eccentric" to want to avoid copying and re-
copying an enormous file just to erase a little data.
Indexed is really a little database in itself.
I believe that some IBM OS'es have similar functionality.
Arne