[mod.computers.vax] Response to LRP, SRP,... question

MHJohnson@HI-MULTICS.ARPA.UUCP (01/28/87)

If the SHOW MEMORY command lists the number of LRP's, SRP's, and IRP's
as higher than the SYSGEN parameters LRPCOUNT, SRPCOUNT, and IRPCOUNT,
it is time to raise those values in SYSGEN.  If you use AUTOGEN, add
lines to your MODPARAMS.DAT file like `LRPCOUNT=50' for each of the
values you need to change and rerun AUTOGEN.  I recommend that you
choose a number about 10% larger than what you see with SHOW MEMORY.
When you crank these values up, you may also have to crank up NPAGEDYN
as well.

The way VMS allocates LRP's and other data structures is to pull them
off of a linked list until it is empty.  Then it uses regular non-paged
pool to allocate the new ones.  This slows down your system and causes
fragmentation in the non-paged pool.  It really does not save you
anything to keep the number of LRP's and other structures less than what
your system uses, VMS will get that storage anyway.

  --Mark <MHJohnson @ HI-MULTICS.ARPA>