Re: Socket Speed Question - RPG vs PC

Changing it didn't make any difference. Bummer. It just seems like 1448
bytes on each read is so limiting...

FTP is even slower.

On Mon, Oct 5, 2020 at 3:21 PM Charles Wilt <charles.wilt@xxxxxxxxx> wrote:

I suspect there's something different...

I'd ask on the midrange-l


On Mon, Oct 5, 2020 at 2:19 PM Brad Stone <bvstone@xxxxxxxxx> wrote:

Well, I would guess that the LAN Console uses a different line
description? Yikes!!! seems like something I don't want to try right now
unless I want to IPL in a worst case scenario.

On Mon, Oct 5, 2020 at 3:05 PM Charles Wilt <charles.wilt@xxxxxxxxx>
wrote:

Brad,

Not sure...last time I changed one...I think I had a twin-ax console!

:)

Charles


On Mon, Oct 5, 2020 at 12:46 PM Brad Stone <bvstone@xxxxxxxxx> wrote:

Charles,

I was looking into that as my line is set at 1492. Now, if I try to

change

it it wants to vary off the line. Can you tell me if it will vary it

back

on automatically?

Or if I do it using a LAN console is that a different line?



On Mon, Oct 5, 2020 at 12:29 PM Charles Wilt <charles.wilt@xxxxxxxxx

wrote:

Do you by chance have an old device configuration with a smaller

frame

size

set?

If you cannot configure the device to support your frame size, you

must

decrease your maximum frame size to a size that the device can

support.

You

can change one or more of the following maximum frame size fields

(location

of the field in parentheses):
- SSAP maximum frame parameter (line description)
- Maximum frame size (line descriptions for token ring, Gigabit and

10

Gigabit Ethernet networks)
- Maximum frame size (controller description)

1GB and 10GB ethernet should default to 8992...

I think some of the older/slower adapters can be configure to 8992

even

though they default to 1492

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_72/rzajy/rzajymaximumethernetframesize.htm

Charles



On Sun, Oct 4, 2020 at 9:23 AM Brad Stone <bvstone@xxxxxxxxx>

wrote:

I am playing around with some sockets and I am finding that the

speed

at

which RPG sockets receive data is much slower than, say, a PC

downloading

with a browser.

On a PC a 5mb file downloads in 3-5 seconds.

On the IBM i using GETURI or HTTPAPI the same file downloading

takes

around

20 seconds which is a huge difference.

These test are HTTP (not SSL). SSL I understand will slow things

down

more

as well, but the time difference seems to be fairly consistent.

In running debugs it seems that the servers I have tested "limit"

the

amount of data on each read() from the socket to 1448 bytes (at

least

in

this case). This seems to be the possible bottleneck. The

receiver

variable I'm using is 1mb.

I sort of understand it's up to the server to decide how much to

send

at

once... I am just curious if any of you that have a deeper

understanding

of

the OS and how these things work can explain this.

Is it simply that RPG is a "slower" language than C, etc?

Of course I'm scanning Stack Overflow for answers, but I haven't

found

anything that explains this, which is why I assume it's just

RPG's

fault.

:)

Bradley V. Stone
www.bvstools.com
Native IBM i e-Mail solutions for Microsoft Office 365, Gmail, or

any

Cloud

Provider!
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