Krypto-trading-bot: OKEx Full orderbook load and latency increasing

[serzhiio]

Guys,
after we started to load full orderbook into K my latency dramatically increased. After i fallback to one of the previous commit everything comes to normal state.

[serzhiio]

Could we have setting inside *.sh file how many levels of orderbook to load?

[ctubio]

yea that was in the plan; just that im slow (and that doesnt feels necesary here)

btw on what exchange do you mean? gdax works super nice here

[CarlitoGrey]

Hey Carles,

I think this is the same thing I mentioned yesterday. I managed to get the super high latency (1s+) to stop by using a ramdisk but I still notice a spike.

[ctubio]

buuut your issue was because of too much frequent writes to the disk, no?

[CarlitoGrey]

That's what I thought it was, and it resolved the issue a bit when I used a ramdisk, but the first time I noticed the high latency was when I update to the latest commit.

[ctubio]

ok well, im not feeling any side bad effect because of the increase of market levels; but will investigate this or any other possible cause of latency in orders.

note orders has nothing to do with market data; and the bandwidth of market data was not increased in latest commit, market data was just stored for longer (and the app is still under the 16Mb)

also please consider to add to your comment what exchange is the affected one for you (at least 1 even if all :P)

[serzhiio]

I noticed such latency at HitBTC. Okex is not affected because of limited
by 20 orderbook. But i think for all exchagen we should have an ability to
choose loaded depth, i say i dont need big depth for my strategy 3-5 is
good, speed is a king.

4 янв. 2018 г. 2:11 пользователь "CarlitoGrey" [e-mail]
написал:

That's what I thought it was, and it resolved the issue a bit when I used
a ramdisk, but the first time I noticed the high latency was when I update
to the latest commit.

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[serzhiio]

Does it affect on okex channel subsctiption?

4 янв. 2018 г. 5:17 пользователь "Carles Tubio" [e-mail]
написал:

Closed #531 https://github.com/ctubio/Krypto-trading-bot/issues/531 via
0d57491
https://github.com/ctubio/Krypto-trading-bot/commit/0d57491b264a68166b2d1cc0ddc2ce87568a863f
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[ctubio]

not much because okex have the most stupid api interface with a hardcoded integer in the function names

at https://www.okex.com/ws_api.html it says that only possible value of Y is: 5, 10, 20(Amount)

[serzhiio]

If I set up 5? will it be subscribed to 5depth channel?

P.S.: Do we manage binary data from Okex?
2018-01-04 12:53 GMT+03:00 Carles Tubio [e-mail]:

not much because okex have the most stupid api interface with a hardcoded
integer in the function names

at https://www.okex.com/ws_api.html it says that only possible value of Y
is: 5, 10, 20(Amount)

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С Уважением,
Матыцин Сергей Леонидович
sergey.[email protected]

[ctubio]

as of today it will subscribe to depth_20 always

that is because K minimum depth is 15, so we cannot make use of 10 or 5 as of today

but you would like to see only 5 market levels for example in okex? (im not sure the UI how ugly will look, but is possible sure if required [and the UI cannot be more ugly xD])

[serzhiio]

Yes i would like to try.

2018-01-04 15:29 GMT+03:00 Carles Tubio [e-mail]:

as of today it will subscribe to depth_20 always

that is because K minimum depth is 15, so we cannot make use of 10 or 5 as
of today

do you would like to see only 5 market levels for example in okex?

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sergey.[email protected]

[serzhiio]

Carles, just to remember:

1. [DONE] Binary mode (if we get orderbook gzipped latency will decrease i think)
2. [DONE] Limited depth to choose (tech team adviced to use 10depth orderbook)
   All this things can help to solve Okex problems.
   Thx in advance.

[serzhiio]

Wow, thx for speed!