Hi Daryl,
On Thu, Apr 23, 2020 at 1:37 PM Herzmann, Daryl E [AGRON] <
akrherz@xxxxxxxxxxx> wrote:
> I am sure Unidata will correct my ignorance / incorrect details, but my
> understanding is that an individual pqact process can only do 32 "things"
> at one time, or there's 32 slots available for work.
>
The "things" are file descriptors and the Unix standard only *guarantees* 32
of them. Modern O/S provide much more.
> Now, the above depends on the action. If you run `PIPE -close`, the slot
The "slot" is a file descriptor.
> can be used for another product even with the PIPEd process still
> running...
The PIPE-d process might still be running, but the file descriptor will
have been closed -- so, yes, that descriptor can be reused.
> This type of action can lead LDM to DOSing the server it is on as it
> will fire off as many PIPE'd processes that it can.
If the decoders take a long time to process the data-product, then, yes,
you can wind up with many of them. This is not a problem with pqact(1) *per
se*, but with inefficient decoders (pure Python, for example, is about
three orders of magnitude slower than C).
Regards,
Steve Emmerson
