Sorry, I can't hold this in. One of my greatest fears is a year of high
attrition form our great staff at Unidata. The volume of knowledge held by you
long termers is massive. Perhaps now is a time to ponder creating legacy
videos. Some of you know the entire history of the LDM. This is important
knowledge to share and, more importantly, remember!
(We have seen what a sudden unexpected loss can do.)
My uncle is going to work with me on recording some oral history of our family.
Maybe you guys can give us a set of tablets that we can use to understand the
future. Okay, maybe not that, but you know what I mean.
Just some thoughts.
Thanks for all that you do,
CH
PS Changed the subject for impact
Christopher Herbster, Ph.D.
Associate Professor of Meteorology
Applied Aviation Science
Daytona Beach Campus
1 Aerospace Boulevard
Daytona Beach, FL 32114
386.226.6444
christopher.herbster@xxxxxxxx<mailto:christopher.herbster@xxxxxxxx>
Embry-Riddle Aeronautical University
Florida | Arizona | Worldwide
[cid:16e50082-7940-4359-b52c-d1993992e9b4]
386.226.6446 Weather Center
http://wx.erau.edu/
Schedule at: http://wx.erau.edu/faculty/herbster/Schedules/
________________________________
From: ldm-users <ldm-users-bounces@xxxxxxxxxxxxxxxx> on behalf of Knight, David
<dknight@xxxxxxxxxx>
Sent: Thursday, April 23, 2020 8:55 PM
To: Steven Emmerson <emmerson@xxxxxxxx>; Mohan Ramamurthy <mohan@xxxxxxxx>; Tom
Yoksas <yoksas@xxxxxxxx>
Cc: ldm-users@xxxxxxxxxxxxxxxx <ldm-users@xxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] Re: [ldm-users] 20200423: Re: Efficiency of splitting pqacts
I have two concerns. Which you can feel free to ignore if you want.
1: (pure Python, for example, is about three orders of magnitude slower than C).
Three orders of magnitude is a lot!
2: I have retired. I suspect some people at Unidata might want to also retire.
One day.
I remember when Java was the new thing. Then Python. I can’t remember how many
new things that have been tried then abandoned.
My concern is that Unidata is always chasing the new thing.
My concern is that you have key people who could retire at any time.
I’m not sure how you address these things. I assume you have a plan.
David
>
> On Apr 23, 2020, at 7:51 PM, Steven Emmerson <emmerson@xxxxxxxx> wrote:
>
> 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
> _______________________________________________
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David Knight
11 Mercer St.
Albany, NY 12203
(518)-438-9269 (leave message)
dknight@xxxxxxxxxx
_______________________________________________
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