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тАО10-25-2005 10:12 PM
тАО10-25-2005 10:12 PM
Re: ZIP limitation?
I'm not certain this applies to your problem:
If you do:
1. $ zip "-Vwj" zipfile.zip $1$dga77:[dir.subdir1]*.*;*
2. $ zip "-Vwj" zipfile.zip $1$dga77:[dir.subdir2]*.*;*
and so on, so you're adding files beyond an existing one. This takes time since the EXISTING data needs to be copied first, I don't know how efficient zip will do this. Uisng this, each addition will take more and more time.
Since you omit the directory information (-j option) it might be that each addition might mean that checks need to be done - and this requires scanning thealready stored information. Again, the more files you have in the archive, the longer it would take.
If next is a directory of 45000 files, you can expect low performance for several reasons: the size of the directory itself will add to the already heavy processing.
Consider to make a separate zip of each directory, and zip these all into one.
1. $ zip "-Vwj" zipfile1.zip $1$dga77:[dir.subdir1]*.*;*
2. $ zip "-Vwj" zipfile2.zip $1$dga77:[dir.subdir2]*.*;*
...
lastL
$ zip "-V" allzips.zip zipfile*.zip
Willem
OpenVMS Developer & System Manager
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тАО10-26-2005 02:23 AM
тАО10-26-2005 02:23 AM
Re: ZIP limitation?
I was zipping about 40-60 files totalling about 1.5gb or so. Doing them all at once was fine but incrementally adding each one separately was much much slower.
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тАО10-26-2005 03:04 AM
тАО10-26-2005 03:04 AM
Re: ZIP limitation?
"[T]he OpenVMS Wizard cannot and does not
recommend storing large numbers of files
in a single (very large) directory."
I'll try and mention that to the long gone application programmers! ;-)
That's why we call them "legacy" systems.
Willem:
No that doesn't apply, I'm zipping individual directories to new zip archives.
Cheers,
Art
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тАО10-26-2005 06:27 AM
тАО10-26-2005 06:27 AM
Re: ZIP limitation?
Slap 'im around a little for me, too.
> That's why we call them "legacy" systems.
Some legacy.
I recall some suggestions in comp.os.vms a
while ago, involving dispersing the files
from the one over-full directory into
multiple (less over-full) directories, and
creating a search-list logical name which
points to the list of new directories.
New files are still a problem, as they keep
getting put into the first directory in the
list, but finding the old files could be
faster.
This assumes that the directory name is not
hard-coded into the "legacy", of course.
Thoroughly re-engineering an application
without actually changing it can be tricky.
Of course, if "unmaintained" means "never to
be looked at again", you may be happier just
suffering for a while with slow Zip.
I'm still pushing Zip 2.31, however, as it's
better, even though it won't solve your big
problem.
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тАО10-26-2005 08:08 AM
тАО10-26-2005 08:08 AM
Re: ZIP limitation?
> Slap 'im around a little for me, too.
If they were still around it might be a closed fist! :-O
>> That's why we call them "legacy" systems.
> Some legacy.
Perhaps "inheritance" is a better analogy, but grannie didn't like me too much!
Ah well, like a fellow I used to work with always said:
"It's all pensionable time."
I'll give v2.31 a whirl.
Cheers,
Art
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тАО10-26-2005 07:31 PM
тАО10-26-2005 07:31 PM
Re: ZIP limitation?
On a VMS system, it will take time (obviously) to DIR a directory of 10.000 files.
On a Unix system, listing a directroy of that size will tell you the commandbuffer is full and show you nothing else.
What do you prefer?
Willem
OpenVMS Developer & System Manager
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тАО10-27-2005 12:27 AM
тАО10-27-2005 12:27 AM
Re: ZIP limitation?
fail. Do you think that a plain "ls" will
have any trouble? Have you tried it, or are
you just guessing?
I prefer less inane comments.
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тАО10-27-2005 01:30 AM
тАО10-27-2005 01:30 AM
Re: ZIP limitation?
VMS is a fine system. The way that some things were implimented by my predecessors could have been done a bit "cleaner" ... other things are quite clever and flexible.
Management keeps referring to it as a "sunsetting platform" except the sun is having a hard time rising on *nix, so I continue to try and patch holes and keep the boat afloat.
There is no "best" system/application out there.
Cheers,
Art
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