"My codebase (mix of CLJ, CLJS and CLJS) is about fifty thousand lines of
code, and compilation times are starting to interfere with my workflow
happiness. In addition, Chrome Devtools is becoming somewhat sluggish due
to the high number of separate namespaces loaded through Figwheel."
That's not an insane codebase size, but I wonder what your actual
compilation times are? Honesty, I'd be surprised if you even got a 20%
speedup in a compiler by simply upgrading the CPU. CPU tech improvements
are more often focused around numerical computing and vector optimizations.
When there are massive leaps forward in raw execution performance, they're
often less than 20%.
So perf numbers are important here. Also if figwheel is loading large
namespaces into the browser, and running a lot of hooks to patch up the
running system, that can also affect performance.
I'd recommend taking a look the CLJS code in a profiler and seeing where
the slowdown is. Perhaps the namespaces are too large and figwheel is
sending across megabytes of JS, or perhaps there's a bad algorithm
somewhere.
On Wed, Aug 23, 2017 at 9:54 AM, Maarten Truyens <
maarten.truy...@siteffects.be> wrote:
> Hi all,
>
> My codebase (mix of CLJ, CLJS and CLJS) is about fifty thousand lines of
> code, and compilation times are starting to interfere with my workflow
> happiness. In addition, Chrome Devtools is becoming somewhat sluggish due
> to the high number of separate namespaces loaded through Figwheel.
>
> My current machine is a 6-core Mac Pro 3.5 Ghz Xeon ("late 2013"). For
> quite a while I have been investigating whether a switch to another machine
> and/or platform would be interesting from a workflow speed point of view.
> However, aside from Timothy Pratley's article on the AMD Ryzen 1800x (
> http://timothypratley.blogspot.in/2017/03/ryzen-is-for-programmers.html),
> I have trouble finding information that is relevant for us Clojure
> programmers.
>
> I would summarize my research as follows:
> * single-core performance is most important, so that it is probably the
> case that a 4-core CPU with a higher single-thread speed is preferable to
> an 6/8/10-core CPU with a slower single-thread speed;
> * as from 4 cores, there are hardly any speedups to be expected for having
> more cores in CLJ or even (parallel) CLJS builds;
> * the Ryzens are great value, but their single-core performance is usually
> 10-20% below the top of the line Intels;
> * according to the many Phoronix benchmarks, Linux and OSX have about the
> same performance, although there are some interesting deviations for some
> workflows (even up to 30 - 40%);
> * the single-core performance difference between my current CPU and the
> single-core top of the line (i7700K, i7-7800X or i7-7820X) seems to be
> between 20-40%
>
> While a 50% performance increase would be enough to warrant the time
> investment & cost of switching, my fear is that the real-world speed-up
> will probably be more like a meager 20%.
>
> Ignoring cost considerations and performance outside CLJ development: what
> CPU and platform would you recommend?
>
> Many thanks!
>
> Maarten
>
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