[Info-vax] DIRCACHE hit rate.

[IanMiller]

On 20 Jan, 17:08, Jan-Erik Söderholm <jan-erik.soderh... at telia.com>
wrote:
> 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.



What's the real issue? Is the time taken for your batch jobs too long?