Re: Socket Speed Question - RPG vs PC

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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