Ternjs Timeout configuration

[DonnieWest]

In ternjs I can set the request timeout for the server like this:

let g:tern_request_timeout = 6000

Is there a way to configure ternjs like this in YouCompleteMe?

Edit: No there isn't. The reason this parameter exists in Tern is because of ternjs' relative slowness in parsing larger projects. With YouCompleteMe I'm now getting "Read timeout" errors that I didn't get with tern_for_vim.

Is there some other workaround or can we implement #742? Changing the timeout manually in the project seems to make this issue go away and give me proper completions

[micbou]

A workaround is to change the value of TIMEOUT_SECONDS in python/ycm/client/completion_request.py.
We are not currently providing an option to change this value because 0.5 second is already a long time. Maybe we should reconsider this with the new Javascript completer.

[puremourning]

Why do you feel you need to change the timeout? Are you hitting a problem of some sort? Would be keen to understand the problem.

On 6 Jan 2016, at 10:15, micbou notifications@github.com wrote:

A workaround is to change the value of TIMEOUT_SECONDS in python/ycm/client/completion_request.py.
We are not currently providing an option to change this value because 0.5 second is already a long time. Maybe we should reconsider this with the new Javascript completer.

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[DonnieWest]

So, I'm going through an Ember book that has it's project source code here:

https://github.com/abuiles/borrowers

When I get home I'll edit this with the .tern-project that I'm using, but, completions take significantly longer than 0.5 seconds on any given file.

[puremourning]

Interesting, thanks. I'll take a look at it, as it will be a useful "large" javascript project to test with.

TBH I don't think that a timeout of anything more that 0.5s is really a solution, in the sense that if you're not getting completions "instantly" then either ycmd or Tern are not really doing their job properly. Waiting for even 1/2 a second is a poor user experience.

FWIW, the tern completer was using Tern's timeout option, but this was causing crashes in Tern. The crash fixed, but we haven't re-enabled the timeout yet, as ycmd has its own timeout mechanism. Using this large project as an example will help us determine what level of timeout, optimisation, etc. is required.

In the meantime, if you're comfortable hacking ycmd, you can checkout tern master in third_party/ycmd/third_party/tern submodule re-add the timeout code to ycmd's tern completer in third_party/ycmd/ycmd/completers/javascript/tern_completer.py

[puremourning]

@DonnieWest did you get round to digging out your .tern-project ? I'm keen to test YCM + tern on a large javascript project.

[DonnieWest]

Sorry! Here you go. A good portion of what you see here isn't necessary but is some of the hacking I've done to get tern.js to give halfway decent completions.

Condensing ember.js also seems to work better in general, but still gives issues here

{
  "libs": [
    "browser"
  ],
  "loadEagerly": [
    "bower_components/ember/ember.js"
  ],
  "dontLoad":[
    "node_modules",
    "dist",
    "tmp",
    "vendor"
  ],
  "exclude": [
    "node_modules/**",
    ".git/**",
    "*.min.js",
    "*.prod.js",
    "*.debug.js",
    "tmp",
    "vendor"
  ],
  "plugins": {
    "node": {},
    "complete_strings": {},
    "es_modules": {}
  }
}

[sbuljac]

I am also keep getting timeout errors. After first error everything starts to lag and ycm is useless. Everything work fine before tern integration (with tern plugin).
btw. I am using Neovim.

[vheon]

After first error everything starts to lag and ycm is useless

@sbuljac What do you mean "useless".

I am using Neovim.

I don't think that this is the problem but could you try with regular vim?

[puremourning]

I think we need to update tern and add the tern timeout. I think tern server is spending too much time doing requests. See my post above for a workaround.

On 12 Jan 2016, at 21:21, Andrea Cedraro notifications@github.com wrote:

After first error everything starts to lag and ycm is useless

@sbuljac What do you mean "useless".

I am using Neovim.

I don't think that this is the problem but could you try with regular vim?

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[vheon]

@puremourning even if we add Tern.js timeout how would it be useful when YCM still has a timeout of 0.5s? Is it for the cache?

[sbuljac]

Please ignore my previous comment. It was Tern fault on the end, I made some config changes at the same time I recompiled Ycm, after timout message Ycm need a lot time to complete if at all...
btw.
I don't think tern is slow, I used it with ycm and tern_for_vim for quite some time and everything worked

[puremourning]

I mean it will limit cpu usage of tern server for a given request rather than unlimited. That leads to general better UX I believe.

On 12 Jan 2016, at 22:03, Andrea Cedraro notifications@github.com wrote:

@puremourning even if we add Tern.js timeout how would it be useful when YCM still has a timeout of 0.5s? Is it for the cache?

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[puremourning]

FYI - i have tried the tern update to fixes crashes on timeouts, but it isn't working, so we're stuck with what we have for now. ternjs/tern#702 (comment)

[DonnieWest]

Well, definitely thanks for checking this out and all the effort you've put into it 👍

[mwcz]

Is the recommended workaround still to edit python/ycm/client/completion_request.py? Thanks!