1.16.3 parallel code runtime errors

jzakiya · May 20, 2025, 7:21pm

I just posted an issue on runtime errors on my parallel twinprime sieive using 1.16.3. Have others experience similar errors?

github.com/crystal-lang/crystal

1.16.3 creaates parallel code runtime errors

opened 07:15PM - 20 May 25 UTC

jzakiya

kind:bug

I just compiled my parallel twinprime sieve code with 1.16.3. It compiles with n…o errors/warnings. However it gives runtime errors . Here's the parallel code section. ``` lastwins = Array(UInt64).new(pairscnt, 0) # largest twinprime val for each thread done = Channel(Nil).new(pairscnt) threadscnt = Atomic.new(0) # count of finished threads restwins.each_with_index do |r_hi, i| # sieve twinpair restracks spawn do lastwins[i], cnts[i] = twins_sieve(r_hi, kmin, kmax, ks, start_num, end_num, modpg, primes, resinvrs) print "\r#{threadscnt.add(1)} of #{pairscnt} twinpairs done" done.send(nil) end end pairscnt.times { done.receive } # wait for all threads to finish ``` Here's a sample of the runtime error messages ``` ➜ crystal-projects CRYSTAL_WORKERS=16 ./twinprimes_ssozgist_newrefy1new.1163 1000000000000 threads = 16 using Prime Generator parameters for P13 segment size = 2,007,040 resgroups; seg array is [1 x 31,360] 64-bits twinprime candidates = 49,450,550,490; resgroups = 33,300,034 each of 1,485 threads has nextp[2 x 78,492] array setup time = 0.001714 secs perform twinprimes ssoz sieve 866 of 1485 twinpairs doneUnhandled exception in spawn: Can't transfer fd=3 to another polling event loop with pending reader/writer fibers (RuntimeError) from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ??? 1067 of 1485 twinpairs doneUnhandled exception in spawn: Can't transfer fd=3 to another polling event loop with pending reader/writer fibers (RuntimeError) from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ??? 1375 of 1485 twinpairs doneUnhandled exception in spawn: Can't transfer fd=3 to another polling event loop with pending reader/writer fibers (RuntimeError) from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ??? 1445 of 1485 twinpairs doneUnhandled exception in spawn: Can't transfer fd=3 to another polling event loop with pending reader/writer fibers (RuntimeError) from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ./twinprimes_ssozgist_newrefy1new.1163 in '??' from ??? 1484 of 1485 twinpairs done ``` How do I now rewrite this so it works again?

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1.16.3 parallel code runtime errors

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