[Info-vax] DIRCACHE hit rate.

[Jan-Erik Söderholm]

Hi.
I have an 7.3-2 Alpha system where I think that
the hit rate on the DIR-cache is way to low.

DS20 with 9GB disks in BA356 shelfs.

Here is what it typicaly looks like :

                        CUR     AVE   MIN      MAX
  Dir Data (Hit %)     3.00    3.20  0.00    30.00
      (Attempt Rate) 312.00  548.90  0.00  2460.00


The ACP_DIRCACHE is at the moment at 4000 (blocks)
but I have raised it to 10000 without any measurable
improvment.

Yes, there are a few DIR's that are "large", but not
*that* large, maybe 5-10.000 files and a few DIR files
of 1-2000 blocks. Another thing is that all files
are timestamped in the filename, so there are
normaly only ;1 files.

My batch jobs create a number of temp files during
processing and I've got a feeling that this is
slowing them down a bit.

Now, what I'd like to ask, is if anyone knows if
this part of VMS has had any major improvments in
the 8.x versions ? We are currently thinking of
upgrading anyway, and it would be nice to know
if these hit rates would improve simply by upgrading.

Best Regards,
Jan-Erik.