Hi,
I'm having some trouble connecting from a Mac to an nREPL running on an
Intel Edison. I'm using boot to launch the nREPL on the Edison; it's
*very* slow to launch (~2 minutes 15 seconds), which is not too surprising
since the Edison is a relatively constrained device (1 Mb RAM, Atom CPU at
500 MHz). But connecting to the nREPL with cider-connect is also painfully
slow (~75 seconds). By contrast, connecting via ssh is quite fast.
Does it make sense that connecting is so slow? I would think that once the
JVM and Clojure are up and running connecting should not be so sluggish.
I'm not sure where to direct this question which is why I'm posting to the
general list. At first I thought is was a Cider problem but now I'm not so
sure. Maybe its an nREPL issue? Any suggestions?
I'm using Clojure 1.7. Would upgrading make any difference?
Note that there are three ways to connect to an Edison. It has two USB
ports; one functions as a serial line you can use to connect using screen,
the other functions as an IP-over-USB line (192.168.2.15 on if usb0; this
works out-of-the-box on OS X, might need some configuration on other
platforms). If you connect it to a WiFI network you get a third IP on
interface wlan0.
If I cider-connect to edison2.local (I named my device 'edison2'), cider
tries to establish a direct connection. If I cider-connect to 192.168.2.15
it tries direct connection; using WiFi IP (e.g. 192.168.1.206), cider tries
to establish an ssh tunnel. In all cases I get the spinning beachball for
well over a minute.
I can cancel the spinning beachball so it isn't totally hung.
Once a connection is established, the nREPL is quite snappy.
## Steps to reproduce the problem
Connect to the Edison via the serial line (i.e. screen -L
/dev/cu.usbserial... 115200 -l) and launch the nREPL using boot (details
below).
On the Mac host, open a simple clj file in Emacs, cider-connect (C-c M-c)
using any of the hosts mentioned above.
Thanks,
Gregg
## Environment & Version information
### CIDER version information
```
;; Connected to nREPL server - nrepl://localhost:8088
;; CIDER 0.13.0 (California), nREPL 0.2.12
;; Clojure 1.7.0, Java 1.8.0-internal
```
### Boot version
~/.boot/profile.boot:
(deftask cider "CIDER profile"
[]
(require 'boot.repl)
(swap! @(resolve 'boot.repl/*default-dependencies*)
concat '[[org.clojure/tools.nrepl "0.2.12"]
[cider/cider-nrepl "0.13.0"]
#_[refactor-nrepl "2.2.0"]])
(swap! @(resolve 'boot.repl/*default-middleware*)
concat '[cider.nrepl/cider-middleware
#_refactor-nrepl.middleware/wrap-refactor])
identity)
Launch cmd: `$ boot cider repl` (this takes a long time, like a couple of
minutes)
nREPL startup msg:
nREPL server started on port 8088 on host 127.0.0.1 - nrepl://127.0.0.1:8088
REPL-y 0.3.7, nREPL 0.2.12
Clojure 1.7.0
OpenJDK Server VM 1.8.0-internal-neck_2016_06_06_15_38-b00
### Emacs version
Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
clojure-mode-display-version: clojure-mode (version 5.5.2)
### Operating system
Emacs running on OS X 10.11.5
nREPL running on Intel Edison:
edison2:~/nrepl$ uname -a
Linux edison2 3.10.98-poky-edison+ #1 SMP PREEMPT Mon Jun 6 14:32:08 PDT
2016 i686 GNU/Linux
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