On Saturday, 11 April 2015 18:35:37 UTC+1, Conan Cook  wrote:
> On Friday, 10 April 2015 18:23:52 UTC+1, David Powell  wrote:
> > Wonder if something somewhere is calling java.io.FileDescriptor/sync - this 
> > i uber slow on Windows (and some Linux filesystems) because it causes the 
> > entire filesystem to sync, not just the selected file.
> > 
> > 
> > On Fri, Apr 10, 2015 at 6:08 PM, Shaun Mahood <[email protected]> wrote:
> > Wow, that's crazy. On my main machine I get
> > 
> > Successfully compiled "resources/public/js/app.js" in 5.545 seconds.
> > 
> > on recompilation.
> > 
> > 
> > 
> > Same project, making the same change to core.cljs, recompilation using 
> > "lein figwheel" I get
> > 
> > Successfully compiled "resources/public/js/app.js" in 0.14 seconds.
> > 
> > 
> > 
> > Running Windows 10 Preview, processor is i7-4790K @ 4.00GHz, 32.0 GB RAM 
> > and an SSD. I can try the same thing on a couple older machines as well if 
> > you want.
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > On Friday, April 10, 2015 at 9:38:47 AM UTC-6, Conan Cook wrote:
> > 
> > > Just do:
> > 
> > >
> > 
> > > lein new chestnut speed-test
> > 
> > > cd speed-test
> > 
> > > lein repl
> > 
> > > (run)
> > 
> > >
> > 
> > > That's enough to show it up for me; a change in core.cljs should trigger 
> > > a recompilation.
> > 
> > >
> > 
> > > For me on a windows filesystem I get:
> > 
> > >
> > 
> > > Successfully compiled "resources/public/js/app.js" in 23.226 seconds.
> > 
> > >
> > 
> > > On a linux filesystem I get:
> > 
> > >
> > 
> > > Successfully compiled "resources/public/js/app.js" in 0.174 seconds.
> > 
> > >
> > 
> > > That's a pretty hefty difference, whatever your machine it should be 
> > > obvious.
> > 
> > >
> > 
> > > On Friday, 10 April 2015 15:27:13 UTC+1, Shaun Mahood  wrote:
> > 
> > > > Conan, if you have a repo I can try it on a few windows machines to 
> > > > compare.
> > 
> > > >
> > 
> > > > I did find that chestnut was really slow to refresh changes and ended 
> > > > up switching to use figwheel instead, it is essentially instant refresh 
> > > > now when I save a file.
> > 
> > > >
> > 
> > > > On Friday, April 10, 2015 at 5:19:58 AM UTC-6, Conan Cook wrote:
> > 
> > > > > I've switched from OSX to Windows and a Ubuntu VM, and am 
> > > > > experiencing extremely slow cljs compilation.  I've got a few 
> > > > > chestnut projects, and have tried the chestnut tutorial as well, all 
> > > > > with the same results.
> > 
> > > > >
> > 
> > > > > I opened an issue over at Chestnut: 
> > > > > https://github.com/plexus/chestnut/issues/114
> > 
> > > > >
> > 
> > > > > The problem is that if I'm compiling files on a Windows filesystem, 
> > > > > it's very slow, whether I'm running leiningen from inside Windows or 
> > > > > inside Linux.  If the files are on the Linux VM filesystem and I'm 
> > > > > running leiningen in Linux, it's nice and snappy.
> > 
> > > > >
> > 
> > > > > Has anyone else had luck compiling cljs on Windows?
> > 
> > 
> > 
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> 
> That certainly sounds plausible, as taking a look at files in use during the 
> compilation shows that core.js gets written a lot even when I've only made a 
> change in another namespace.  Surely it should be an incremental compilation?

That said, there doesn't seem to be any mention of Filedescriptor in the 
Figwheel codebase: 
https://github.com/bhauman/lein-figwheel/search?utf8=%E2%9C%93&q=filedescriptor

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