On Feb 5, 2014, at 11:42 PM, Michał Marczyk wrote:
> This returns
>
> (.getTotalPhysicalMemorySize
> (java.lang.management.ManagementFactory/getOperatingSystemMXBean))
>
> You could use this in your project.clj, perhaps by including
>
> ~(str "-Xms" (quot (.getTotalPhysicalMemorySize ...) appropriate-number))
>
> in :jvm-opts.
Very cool. I had no idea I could do computation in project.clj. The following
seems to work to allocate 80% of the a machine's RAM to my process (launched
with "lein trampoline with-profile production run"):
:jvm-opts [~(str "-Xmx"
(long (* (.getTotalPhysicalMemorySize
(java.lang.management.ManagementFactory/getOperatingSystemMXBean))
0.8)))
~(str "-Xms"
(long (* (.getTotalPhysicalMemorySize
(java.lang.management.ManagementFactory/getOperatingSystemMXBean))
0.8)))
"-XX:+UseParallelGC"]
I'll ask more about the GC part in another thread.
> Also, you can absolutely use your own :jvm-opts with :replace.
How do I combine them? Does the big vector above just replace the [] in
":jvm-opts ^:replace []"?
Also, does this (the :replace part) in fact do the same thing as putting
"with-profile production" on the command line? So if I do this I can simplify
my command line to "lein trampoline run"?
Thanks!
-Lee
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