jOpenSpace - Jiří Kadlec - Java Virtual Threads
preview featura JDK19
starsi java ma Thread rizeny OS, 1MB pameti per thread mimo heap, ridi system, vyzaduje context switche
stejny interface jako Thread
nove jeden carrier thread rizeny OS realne provadi mnoho virtual threadu
na pozadi fork/join pool
stare reseni pri threadpoolu 500 a tasku ktery waituje po dobu 1s, execute trvalo 20s a vyzadalo 200MB
nove reseni bezi 1s a vyzaduji 80MB
nepouzivat Thread pools
nepouzivat ThreadLocals (nasobi se velkym mnozstvim virtual threads)
nepouzivat sychronized klauzule ale ReentrantLocky
vhodne pouzivat Semafory pro omezovani pristupu k I/O resourcum, abychom je nezahltili requesty
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