How to stop monitoring PV's ?

[Henk]

Client is using a Hub for monitoring pv's generated.
But Hub is unable to store state.
So how can a client stop monitoring.
In the past I used database to store state but is there no better solution. Using a database is ugly.
Hub can access client. Client can access hub. But cancellationToken is local.


Maybe these tasks or threads are globally accesible?

In that case Hub can look up the task and stop it.

[Henk]

Using .net of course.

Maybe taskscheduler? Or Task.(something I don't know yet)

[Henk]

Maybe Hub has no problems with storing static data. In that case I store these cancelation token (source)s as static data and problem solved.
Although ugly solution as well if it works.

[Sven]

What exactly does "monitoring PVs" mean in your case? If your engine conforms to either of the two protocols CECP (WinBoard) or UCI then it will print lines containing PV information during search, either in the standard (or even extended) WinBoard format or through an appropriate "info" command for UCI. CECP has "post" and "nopost" commands that tell the engine that it should or should not print PV information from now on, and if an engine implements these two commands then that is already the way how it works for WinBoard (if that is what you want to achieve). For UCI I don't know whether there is a standard way to suppress PV output, I don't think there is one, I only know a "de facto standard option" to enable/disable *current variation* output.

Maybe you were even talking about something completely different ... hubs and .NET, not my world ...

[Henk]

Client or clients are browsers. Hub runs on internet information server.
Maybe I better switch to WPF. For only 'stupid' or non-interesting applications run on internet.
How can a server search for best moves for chess positions for many clients simultaneously.
Server is not capable to do that. Or it must be a super computer or many servers

I am not going to let engine run on the client. Will be too slow I guess.
Because interpreters are slow and development is slow for you get more run time errors.
And then I should learn javascript, typescript or perhaps xslt. While I am used to C#.

My chess web application is only local. Inconvenient for you have to start browser plus iis.
I was going to port it to .net core.

But singleR for .net core changed. Also Entity framework changed compared to .net.

Unfortunately I don't know anything about WPF. So it will take time to learn and perhaps to costly.

By the way if I store Cancellor as a static variable in the Hub start/stop analysis worked. But ugly solution.

Console application is already ported to .net core. Was easy if you don't use EF(database).

[Henk]

Maybe I will post a new video on YouTube to show monitoring PV's using signalR on .net core.

Or perhaps post some code. But I hacked it together for I was only interested in 'proof of concept' and it all took too much time.
Even signalR exercise on microsoft website for .net core 2.2 missed an important statement. Took four hours too find out.
[Making me crazy. Also neigbors fighting. So I am not only lunatic here. In Holland there is lack of room. So over aged children living with their parents fighting all day until police arrives. Problem for me is the noise of course. But I should have used earplugs. Although that doesn't work for often they scream for help and police]

Did not try a Chess webAPI instead of ChessHub. Maybe interesting too.

[Henk]

Hi hi hi. Maybe an idea is create a livestream on YouTube titled 'Solving Chess' showing process of finding PV for initial position.
Maybe run livestream every day and see how many viewers you get. Or has this already been done.

[Henk]

Maybe I will post a new video on YouTube to show monitoring PV's using signalR on .net core.

In the meantime: Just using stupid Skipper library producing crap PV's as usual. Even formatting does not work. So have to fix that first.
(Seconds must be centiseconds I guess)

Code: Select all

Depth  Value   Time(seconds)   Nodes
1 45 7 20  d2d4 
2 5 9 107  d2d4  d7d5 
3 44 12 541  e2e4  e7e5  d2d4 
4 1 17 1259  e2e4  e7e5  d1h5  d7d6 
5 26 18 1999  e2e4  e7e5  d2d4  e5d4  d1d4 
6 6 32 5498  e2e4  e7e5  f1c4  c7c6  d1h5  d8e7 
7 43 43 9353  e2e4  e7e5  d2d4  e5d4  d1d4  a7a6  d4d1 
8 27 72 19795  e2e4  e7e5  d2d4  e5d4  d1d4  c7c6  c1f4  c6c5 
9 31 224 89219  e2e4  e7e5  d2d4  e5d4  d1d4  d8e7  d4a4  e7b4  a4b4 
10 14 891 404625  e2e3  e7e5  d2d4  e5e4  c2c4  f8b4  b1d2  d8g5  a2a3  g5a5 
11 24 1750 899333  e2e4  e7e5  d2d4  e5d4  d1d4  b8c6  d4d5  d8h4  f1c4  f8b4  b1d2 
12 2 4492 1925766  d2d4  d7d5  e2e3  c7c5  d4c5  b8c6  b1c3  e7e6  c3a4  e6e5  f1d3  f8e7 
Analysis stopped