It's an emacs 'swap file' @qqq

@alandipert : thanks! (re swap file)

boot.user=> (start-repl)
java.lang.IllegalStateException: Can't change/establish root binding of: *cljs-repl-env* with set

I'm running into the same error as: https://github.com/cemerick/piggieback/issues/48

Curious what everyone else’s boot time is. When I run: time boot -h I get: boot -h 11.62s user 0.61s system 135% cpu 9.039 total Is this normal?

I think not - in this video https://youtu.be/TcnzB2tB-8Q?t=5m49s, the command is virtually instantaneous

@chooie maybe this? http://stackoverflow.com/a/39698914

On my 4 yo laptop it takes like 3-6 seconds

Thanks for the idea, Alan. Unfortunately, I’m seeing similar results: boot -h 12.82s user 0.93s system 110% cpu 12.452 total

what kind of machine are you on?

I think I’ve seen that with some weirdness related to ipv6 in /etc/hosts ?

Hardware:
Model Name:	MacBook Pro
Model Identifier:	MacBookPro11,1
Processor Name:	Intel Core i5
Processor Speed:	2.4 GHz
Number of Processors:	1
Total Number of Cores:	2
L2 Cache (per Core):	256 KB
L3 Cache:	3 MB
Memory:	8 GB

Software:
System Version:	macOS 10.12.2 (16C67)
Kernel Version: Darwin 16.3.0

/etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1	localhost
255.255.255.255	broadcasthost
::1             localhost
fe80::1%lo0	localhost

127.0.0.1   localhost mbpro.local
::1         localhost mbpro.local

weird, roughly same vintage as my thinkpad

I’ll have to do some more digging. I’ve always had long startup times with leiningen and boot

thanks in advance for reporting what you find, or adding to wiki

i'm sure whatever you discover is afflicting many other mac users

for anyone else running into the similar error I got -- it was fized by swapping reload /cljs-repl

i.e. the correct order needs to be: watch, reload, cljs-repl, cljs

@chooie, it takes a long time for me as well: boot -h 48.40s user 2.70s system 249% cpu 20.516 total

note that it matters where you run boot even for -h, i.e. it reads your build.boot, resolves the deps etc.

in an empty directory (no build.boot) I get boot -h 22.19s user 1.01s system 270% cpu 8.565 total

(also on macOS, mid-2012 macbook air)

is it true that it's much faster on other people's machines? I'd love to see numbers on other systems

ah, adding -B and -P brings it down a bit: boot -BPh 12.00s user 0.51s system 304% cpu 4.107 total

I think boot -BPh is better for comparing numbers

time BOOT_JVM_OPTIONS="" boot -BPh
8.12s user 0.36s system 339% cpu 2.496 total

time BOOT_JVM_OPTIONS="-client -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -Xmx2g -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -Xverify:none" boot -BPh
2.44s user 0.22s system 190% cpu 1.392 total

@chooie ^ FYI

that bring it down to 2.6 s for me

yours is still twice as fast @pithyless

Has anyone here any experience with running a ring/cljs app with boot-cljs, boot-reload and friends behind a proxy? I am trying to make my app relocatable so that a proxy can serve it to the outside world as (e.g.) /myapp. Mix in ring contexts, redirect responses, buddy authentication and interactive CLJS development for fun.

adding another datapoint: boot -BPh 8.12s user 0.38s system 379% cpu 2.241 total on an early 2016 MBP running Sierra

wow. here I was thinking of upgrading to a new MBP!

and it's actually not much faster than my 2012 MBA

yeah, I just upgraded from a 2010 model, and I wasn't blown away or anything

you just saved me 2500 bucks

my commission is 10% 🙂

boot startup time is (one of) my main hardware purchase criteria

correcting my earlier statement, this is technically a mid-2015 model, which was bought in early 2016

applying the /etc/hosts fix that @alandipert linked above didn't appreciably improve my startup time

the JVM options from @pithyless bring my startup time to just over 2 seconds, though

not bad, highscore I guess @ska?

worth noting, limiting tiered compilation makes longer-lived things noticeably slower

seems like a good idea for shebangs tho

@pesterhazy Dell Latitude, dual core w/ hyperthreading (could not get a real quadcore w/o nvidia card sigh), 16GB RAM, SSD fully encrypted... Works pretty well. 😄

ya your choice is much better (and performance too) if you can use Linux

Working in companies since 1999, always on Linux. happy, happy, joy, joy. (OK, a Windows VM comes in handy from time to time)

sorry, pretty off-topic

My results are almost identical to @ska

Hmm, I have tiered compilation enabled, but I often keep apps running for several days

tiered compilation is on by default in java 8, the sticker is XX:TieredStopAtLevel

there is a tower of JIT compilers, C1-C4, restricting to 1 limits optimization potential

> While Leiningen continues to be ubiquitous, boot made significant advances this year, moving from 13% usage to 22% usage.

survey results are out ^ 😉

> there is a big jump in the number of ClojureScript developers using boot (from 15 to 23%).

extrapolating, we can expect 100% boot by 2025 😁

possibly 110% in 2026

Congrats cobblers, 22% is an amazing achievement

Heh

I switched to boot a week ago and I'm liking it a lot so far, feels even better than leiningen! Congrats and thank you very much to all the devs!!

boot-cljs-devtools really made my week 🙂

i wonder how many use both? i've gone completely over to boot but i'll bet there are a lot of experimenters.

I've got a project right now that's in a hybrid state 🙂

not super happy with it, but transitioning certain things is challenging.

haha "cobblers", +1

Sometimes you have to use both, especially if your co-workers use Cursive

i've got some legacy leiningen stuff. after months of boot-only it just confuses me.

getting better at converting, anyway.

@geoffs sounds tough

what does add-cached-resource do? there is no docstring for it 😕

boot.user=> (doc add-cached-resource)
-------------------------
boot.core/add-cached-resource
([fileset cache-key cache-fn & {:keys [mergers include exclude meta], :as opts}])
  Like add-resource, but takes a cache-key (string) and cache-fn instead of
  a directory. If the cache-key is not found in Boot's fileset cache then the
  cache-fn is invoked with a single argument -- a directory in which to write
  the files that Boot should add to the cache -- and the contents of this
  directory are then added to the cache. In either case the cached files are
  then added to the fileset.
  The opts options are the same as those documented for boot.core/add-resource.

it's in 2.7.1 version

it's doing kind of a lot of stuff so if the docstring isn't clear feel free to ask 🙂

one example use case is in boot's built-in uber task

the uber task unzips your depdendency jars and adds the jar entries to the fileset

this can be quite a lot of work and I/O

but we can cache the exploded jars

it uses the md5 checksum of the jar file as the cache key

here: https://github.com/boot-clj/boot/blob/master/boot/core/src/boot/task/built_in.clj#L673-L675

Is it possible to change the voice for (speak) ?

@micha i see, so its just meant to use as a cache to not add extra things to the fileset?

the files still get added to the same location as if they were called with add-resource ?

yes

but it's faster because of caching

it can amortize the work of transforming the set of files into the stuff the fileset needs

ok cool! thats totally not what i need, but nice to know its there. 😆

@micha another question for you

how do you interactively develop a custom task? is there some breakpoint functionality that you use? ideally id like to have a repl while the fileset is being transformed

probably easiest thing is to edit build.boot and do (load-file "build.boot") to reload

inthe repl that is

you can also of course make a namespace and do (require 'my-task.namespace :reload) in the repl

would that let me run one of my tasks? id imagine i’d want a way to interactively play around with the fileset that one of the handlers is processing

run some boot commands against it, see what works and what doesn’t

imagine https://github.com/boot-clj/boot/wiki/Tasks#pre-tasks

id like to run some commands in the repl at the "; work is done here” part

i don't think there is anything that does exactly that

yeah running a task against some fileset is something I would be interested in too...there a new-fileset feature and probably this can be used to get some degree of mocking

@micha do cached resources survive across multiple boot runs? Could cljs take advantage of this feature to not take 5m of the start time?

@dominicm yes that's right, they are cached forever currently

i don't know if that would help the cljs compiler though

there are also per-project caches

@richiardiandrea that seems nice! i’ll have to try that

is there a way to set system properties when initializing a pod?

I get a -Dmaven.multiModuleProjectDirectory in boot-mvn

system properties are JVM global though

you can do System/setProperty

i don't know how thread-safe that is

Oh

Ok let me try

ah it looks like the property is there, but does not match the version in the pod

weird, as it is calling org.apache.maven.cli.MavenCli....anyways thanks for the hint 👍

this is weird:

Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T08:41:47-08:00)
Maven home: <unknown Maven home>

does anyone use bootlaces to push releases to clojars? im having trouble with the gpg signing

i have a gpg.edn file in ~/.boot/gpg.edn but it doesnt seem to be using it

> gpg.edn can be global, sourced fom your home directory, or local to your project. Local gpg.edn takes precedence over global one.