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<skinux>
Antiarc: What is Parellelism??
<Antiarc>
The ability to run multiple threads on multiple cores at the same time. MRI has a global interpreter lock which only allows one thread at a time to be executing, which means that even interleaved across multiple threads and cores, you will only be able to use 1 core's worth of CPU
<Antiarc>
JRuby has no such GIL, and so if you have an 8-core machine you can run 8 threads at the same time without them having to wait for each other
<skinux>
I thought that was handled by the OS or even lower-level than that?
<Antiarc>
Thread scheduling is handled by the kernel, but MRI makes each thread acquire a lock before it can run
<Antiarc>
So even if the OS schedules Thread B, it has to wait for Thread A to release the lock before it can do anything
<skinux>
So, JRuby handles which core a thread is run on?
<Antiarc>
So thread B is "running" but it won't be doing anything, it'll just be waiting on the lock
<Antiarc>
No, JRuby just doesn't have an interpreter lock, so "normal" thread scheduling works unimpeded
<Antiarc>
(I believe the plan is to eliminate the GIL in MRI in Ruby 3, but until then, if you have CPU-bound code, JRuby runs multiples faster than MRI)
<Antiarc>
If your code is IO-bound (ie, a web app) then you may not see noticable performance improvements from parallelism. But JRuby's JIT tends to do *really* well with long-running code like Rails apps.
<Antiarc>
So it can end up faster in those circumstances, too. Though neither will make a slow DB faster :)
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<eregon>
headius: Hi!
<eregon>
headius: Can I update com.headius:options to 1.2? I observe quite a few times NPE due to loaded=true but value still null
<eregon>
(in jruby core pom)
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<kares>
so whens 9.0.4.0 coming? ... the java.lang.NoSuchMethodError: org.jruby.Ruby.newString()Ljava/lang/String; is a bit annoying
<kares>
(know its fixed on master already)
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<chrisseaton>
headius or enebo around?
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