Re: How do I track down a painfully long pause in a small web app?

GC would be the first suspect, but then it could also be combined with a swap issue, or a JVM bug. Have a look at this article, which ends with a concrete list of things to do: https://blogs.oracle.com/poonam/entry/troubleshooting_long_gc_pauses -- You received this message because you are subs

Re: How do I track down a painfully long pause in a small web app?

If you turn on verbose gc for the JVM you could at least rule out GC pauses. Hmm, exactly how do you route the requests through the apache server? It almost sounds like your applikation is restarted every now and then, iirc Apache only servers a limited amount of requests per server thread. If th

Re: Productivity tip for code transformations with cider

Nice! Thanks for sharing! On Mon, Sep 15, 2014 at 1:40 AM, Jony Hudson wrote: > Why did I never think of using that! Nice :-) > > > Jony > > > On Sunday, 14 September 2014 08:35:16 UTC+1, Stathis Sideris wrote: >> >> Hello all, >> >> There is some functionality in cider (C-c C-w) that can potent

Re: How do I track down a painfully long pause in a small web app?

Few thing to consider: 1. Which API calls pause? If only certain calls pause, then probably you have something specific to suspect. Try adding a dummy REST call - see if that call pauses while others do. 2. Is any of your services running on a t1.micro or a burst-oriented EC2 instance on AWS? Tr

How do I track down a painfully long pause in a small web app?

I have an embarrassing problem. I convinced my boss that I could use Clojure to build a RESTful API. I was successful in so far as that went, but now I face the issue that every once in a while, the program pauses, for a painfully long time -- sometimes 30 seconds, which causes some requests t

Re: defrecord inside defmacro

Hi, you need to syntax-quote the list you return from your macro. (defmacro some-record [some-name] `(defrecord ~some-name ['in 'out])) Note the backtick `. You then also have to explicitly quote your record field names (see 'in and 'out, try to remove the quotes to see why). Also s

Re: Designing API for a Markov Model

Hi Chris, I'm more than happy to answer questions. General background for the project: My friend Jay Vyas initiated BigPetStore, a big data application blueprint for the Hadoop ecosystem centered around transaction data for a fictional chain of pet stores. BigPetStore is currently part of the Ap

convert between PersistentArrayMap and HashMap

I am writing clojure code calls java's method which parameters and return are HashMap. When I call java method with clojure's Map, the following error occurred. java.lang.ClassCastException: clojure.lang.PersistentArrayMap cannot be cast to java.util.HashMap So, I'd like to convert nest

defrecord inside defmacro

Hi all, I started learning Clojure very recently by rewriting my old college Java project to Clojure. Having bunch of records I wanted to automate record creation with macros and to finally learn Clojure macros, but I got stuck. Example (Real code will be more complicated but I need to make this

Re: Designing API for a Markov Model

A few questions out of curiosity, if you don't mind: * Have you looked at existing MM libraries for Clojure? * Is there something you need that other's don't currently offer/emphasize; or is this more of a learning project? * Are you planning on or interested in open sourcing your work? Best Ch

Re: jetty restart failing

Thanks for the info Sven. I also found out something, after watching this presentation: https://vimeo.com/100977463 I felt that was too much for me, but I'm digging into his source codes to learn more, and he seems to do a more robust way to shut down the server: https://github.com/juxt/modular/b

Re: Pause a go loop

That's what I came up with. alts is very powerfull ! thanks On Friday, September 12, 2014 11:56:56 PM UTC+2, Dylan Butman wrote: > > How about this? > > https://gist.github.com/pleasetrythisathome/4f03ba9f729300beea40 > > On Friday, September 12, 2014 12:51:39 PM UTC-4, Jeremy Vuillermet wrote: >>

Office Hour Requests

Hey all, Is anyone game for clojure office hours session. I even vaguely recall someone building a webapp that connected people who wanted to pair program. It was designed to be used on an ad-hoc basis. But I don't recall where that went. I want to focus on these things, in that order. - *test

Re: jetty restart failing

Hi Wilker, I have been going the same way and never really found out why this happens (I am using http-kit instead of jetty). However, one thing that I did not knew was that a refresh will delete references of vars. So if you keep your stop function somewhere and call refresh before the stop fu

Re: Productivity tip for code transformations with cider

Why did I never think of using that! Nice :-) Jony On Sunday, 14 September 2014 08:35:16 UTC+1, Stathis Sideris wrote: > > Hello all, > > There is some functionality in cider (C-c C-w) that can potentially save > you a lot of typing when transforming Clojure code and I haven't seen many > peop

Re: Productivity tip for code transformations with cider

Nice useful demonstration, Stathis. Thanks! On Sunday, September 14, 2014 3:35:16 AM UTC-4, Stathis Sideris wrote: > > Hello all, > > There is some functionality in cider (C-c C-w) that can potentially save > you a lot of typing when transforming Clojure code and I haven't seen many > people us

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

For all the good qualities of the Clojure group, it can sometimes produce a bit of a harsh tone. Don't let that get you down though, it's great that you're building stuff and showing it off! As far as defun goes, it looks interesting. The out-of-the-box pattern matching was one of the things I

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Cool idea! I really wish something similar was available out-of-the-box - perhaps it makes sense to include such a macro in core.match itself as some point? — Cheers,  Bozhidar On September 14, 2014 at 9:47:21 AM, dennis zhuang (killme2...@gmail.com) wrote: Hi , i am pleased to introduce defu

Re: Why You Should NOT Implement Layered Architecture

I think this article is partly true, at least in the OO world we know today. I dealt with a number of OO based commercial softwares in the past 10 years that used abstractions that were at best annoying, at worse made the internals obscure up to a point where you wondered if these were added only

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Criticism accepted Herwig. I apologize for not doing so initially. On Sunday, September 14, 2014 12:15:36 PM UTC-4, Herwig Hochleitner wrote: > > Hi Dennis, > > marrying core.match to defn is a pretty neat idea. Thanks for releasing it! > > I see that you actually extended defn in that you made i

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

And of course ,it still run in constant stack space just like normal recur form. P.S. I think adrian's advice is good, please forgive my poor english,and i changes the description to ' a macro to define clojure functions with pattern match just like erlang or elixir. 2014-09-15 0:26 GMT+08:00 den

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Hi Herwig Actually,defun just define a variadic arguments function,so it doesn't have different arities. And when using defun macro ,it walk through the body forms, find 'recur' forms and replace them with (recur (vector ...arguments)) instead. A macroexpand-1 result of accum: (macroexpand-1

Re: Why You Should NOT Implement Layered Architecture

Looks like a pretty standard rather naif article by someone who knows enough to be dangerous but not enough to actually understand about trade-offs. And I'm not sure why you think it's even slightly relevant to Clojure: or did you think Clojure eschewed abstractions? -- You received this mess

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Hi Dennis, marrying core.match to defn is a pretty neat idea. Thanks for releasing it! I see that you actually extended defn in that you made it possible to recur between different arities. Can you give a quick rundown on how you made that work? Are the arities still separate IFn arities? Does it

Re: Designing API for a Markov Model

Thanks for the response! You make a really good point about the first interface -- makes it easy to use with the built in functions. The only things that really define the process is the model (a transition matrix) and the current state. The model doesn't change but the current state does. The

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Friendly advice: when you describe anything you create with adjectives like beautiful, it comes off as unnecessarily arrogant to native English speakers. Adrian On Sunday, September 14, 2014 2:47:28 AM UTC-4, dennis wrote: > > > Hi , i am pleased to introduce defun

Re: Designing API for a Markov Model

It's nice if the function returns the same sort of data as it consumes, because then it's easy to repeat it with `iterate` or `reduce`. So, if you take your first example, then you could write: (take 100 (iterate (partial progress-state markov-model) initial-state)) to get the next 100 states

Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Released 0.1.0-RC, defun collect :arglists metadata, another recursive function example: (defun accum ([0 ret] ret) ([n ret] (recur (dec n) (+ n ret))) ([n] (recur n 0))) (accum 100) ;; the result is 5050 2014-09-14 14:46 GMT+08:00 dennis zhuang : > > Hi , i am pleased

Why You Should NOT Implement Layered Architecture

Here is a link to an article which makes me think more people are seeing the light on the java side: http://java.dzone.com/articles/why-you-should-not-implement It's a nice illustrative demonstration that might be handy if you're looking for arguments for those left behind in Javaland/J22E/Sprin

Re: ANN: Potemkin 0.3.0

Does Potemkin work well with clojurescript? I have seen some discussion of issues in some places. Is there anywhere that notes challenges? I am particularly interested with the import-vars scenario (defining namespaces separately and then merging definitions into one namespace for usage). Dav

Productivity tip for code transformations with cider

Hello all, There is some functionality in cider (C-c C-w) that can potentially save you a lot of typing when transforming Clojure code and I haven't seen many people using it, so I made a screencast to demonstrate: http://www.youtube.com/watch?v=LXhWW1Yqpt0 Hopefully you'll find it useful. Th