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taa_dtn has contributed to 150 posts out of 21083 total posts
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20 Most recent posts:
Thanks, Steve. I've upgraded.
I can log into IQFeed successfully at the moment.
I've seen the problem you reported occasionally over the past month. I have confirmed physical disconnects, though, and restarting my app always solved the IQFeed issues, so I had guessed the disconnects were responsible. Given your evidence, I'm reconsidering.
I've seen this, too, but I thought it was due to local connection issues.
For some indicators you want the split-adjusted prices, for others you want the historical prices and volumes exactly as transmitted on that day. There's no one-size-fits-all solution.
I like the current IQFeed approach, where I can get the tick data as-transmitted, plus the splits. I store both so I can construct split-adjusted data when I need it.
That said, it's often the case that splits are described incorrectly either as to date or as to ratio. This problem is not unique to IQFeed; you can observe it on practically any online source of split history. As a consequence I run a sanity-check on splits in my database every night. Things to watch for include multiple splits within a few days of one another, splits with implausibly large or small ratios, and split information that's delivered for the first time after the date of the split.
My split-adjustment code includes a table of known corrections that are applied automatically when split-adjusting. That table has to be maintained manually, though.
If anyone has a better solution, I'd love to hear about it!
Same here; each history-request thread has its own socket. I actually did this in reverse of the order jayqwi used; I started with each requester being a separate process, then switched to separate threads because load balancing is easier that way. I'm using tags, but only to make sure that no stale data arrives from previous requests; the intent is to run each request to completion before starting another.
Probably irrelevant, but while history-requests are being processed I do have at least two other independent processes with their own connections to the Level 1 port.
And I should emphasize that I haven't seen this misbehavior at all this month. Since my software hasn't changed (or even been recompiled), and iqconnect.exe hasn't been changed, I think that points to either Wine or the software running on the servers. I know there was a Wine update last month, so I suspect something got fixed in that release.
I'm running client version 184.108.40.206 currently. I've been seeing this behavior for years, though, with many different versions of the client and a few different versions of the protocol and with two versions of my app. That's why I went to the trouble of implementing the workaround, and among the reasons why I suspect the problem isn't in the app or iqconnect.
In my case, each thread (of 8) issues a request and processes it to completion before issuing another request. Anything unexpected is logged, so I'm pretty sure there's nothing leftover that hasn't been processed. I simply get no response (and I've also tried a wide range of timeouts with no success).
My app is written in C++ rather than Python, but I've often seen equivalent behavior. I believe this to be due to a bug in Wine. I work around it by closing the socket, opening a new one, and retrying the request. This works always, so far as I can tell.
Coincidentally, I haven't seen this happen in over a week, so I was wondering if a recent Wine update had fixed it. My current Wine version is 7.22 (Staging), the default version for Fedora 36.
False alarm. Turned out to be due to an update elsewhere in the system that cause network connectivity issues.
Using Wine 7.12 under Feodora 36. No updates to Wine or to my software in the past several weeks. No problems until this morning. Here's what's in the log. Any ideas?
=== IQConnect Log File Opened On Tue Sep 13 10:43:38 ===
Current Log Levels,Connectivity,Information,Admin
Current IQFeed Version,220.127.116.11
STATUS Connectivity 464 0 2022-09-13 10:43:38 Initializing the login thread
STATUS Connectivity 456 0 2022-09-13 10:43:38 Creating trader account verification thread. Status idle
STATUS Information 460 0 2022-09-13 10:43:38 Unable to start Authentication Server. Error (107): Connection refused
STATUS Connectivity 452 0 2022-09-13 10:43:42 Waiting for authentication threads. Result:102 Code:183.
Thanks! It looks like that will work nicely.
Hi, folks. The lists of symbol additions/changes/deletions at http://iqfeed.net/symbolguide are no longer updating. Have those moved, or is this a glitch?
Yes, I experimented with this a few years ago. Your questions are relevant and insightful, but I don't have much useful information to offer in reply.
I haven't seen many published papers on the subject in recent years. Take that with a grain of salt, though, because I'm not looking actively enough. Possibly if the technique has been applied successfully, it hasn't been discussed in public for the obvious reasons. Hopefully someone else will reply with better information.
In general, I hit the same roadblocks you did. It's hard to choose the right network architecture (financial data isn't statistically stationary, so I wasn't able to design either recurrent or convolutional networks that were consistently successful). Raw tick-by-tick data has so much variability along so many dimensions that I suspect feature engineering is necessary, but that's a major research project in its own right. Techniques currently being used for natural language processing are probably where I'd start if I were to look at this again today.
Possibly the most fundamental problem I ran into is that it doesn't seem workable to use a scalar value to measure outcomes, so anything based on simple gradient descent is problematic. I think a practical outcome measurement must be at least three-dimensional -- it needs to include return, risk, and capital management. Arguably more, but the need for those three is easy to understand.
Hmm. I haven't run into this problem on my system (Wine 6.21 on Fedora 34). However, I'm still having issues with iqconnect failing to shut down after the last client closes, so I'm killing it explicitly and restarting early each day. Do you have any unexpected iqconnect, explorer, etc. processes lying around?
Thanks for the reply, Gary.
I've written a toy app that exhibits all the correct (expected) behavior, so I'll try to nail down what's different between that and my real apps. I don't have much time available this week, so my next update here might take a while longer.
Now that I have an example working, it's clear that the problem is unrelated to the protocol and client software upgrades.
For reference, I start iqconnect.exe using fork() and execl(), passing a path to the executable and all the appropriate arguments. I wait a few seconds for it to initialize and then I connect. This has worked well for years. CrossOver has never been necessary.
My concern is that iqconnect is still running, sending data to a socket that it thinks is still connected to a client even though the client process is long gone. This is very likely to cause problems somewhere down the line. At the very least, iqconnect's CPU demands are going to get progressively larger over time as clients connect and disconnect. At the worst, it could block and be unable to accept new connections. Plus, the widget tray fills up with multiple connection manager icons, some of which don't respond to mouse clicks, which is ugly and confusing.
I still have no solution to this, though a few things I've observed suggest the problem might be related to the way I start iqconnect. I've tried several different methods, and they all misbehave, but some in different ways than others. The common behavior for all of them is that iqconnect thinks it's still connected to a client even after the client (a) closes the only socket it has open to iqconnect, or (b) exits entirely.
FWIW, this problem doesn't exist when using protocol 4.9, but does with 6.2.
So, what is the recommended way to start iqconnect under Wine?
I'm in the middle of a long-overdue protocol upgrade (to 6.2) and I'm seeing some odd behavior that I wonder if anyone else has encountered.
The problem is that long after my app has exited, iqconnect.exe is still running. Diagnostics.exe client stats claims the app is still connected, and still receiving data on the Level 1 port. However, I've confirmed that my app is definitely not running.
ShutdownDelayLastClient is set to a reasonable value (10 seconds), but I doubt it applies, since iqconnect.exe thinks it's still talking to a client. I see that start.exe, conhost.exe, explorer.exe, and iqconnect.exe are all still running, though. Manually stopping the feed closes everything down as expected.
All this is on Fedora 34 Linux using Wine 6.18, so that might be a factor.
Seconding BottomFeeder's request: Is there any estimate for when the historical data will be updated?
Just FYI, today I was seeing the response '!ERROR! Unknown Server Error code 0.' during history fetch from servers in the IP range 18.104.22.168/24. This occurred repeatably. I worked around it by adding a small delay between history requests.
Follow up: Fedora recently upgraded to Wine 6.0, and IQConnect seems to be working again. I'll let you know if the problem reappears.