Hi All, I'm trying to add a custom thread barrier to the array_add function by using __sync_fetch_and_add. The system I'm using is MSI using Ruby in SE mode. When I run this, I get the following error: build/X86/mem/ruby/system/RubyPort.cc:434: fatal: Ruby functional read failed for address 0x15b918. Till now I have observed that there is an open issue which mentions that Ruby+multithreading+SE is not supported. The exact fault occurs in Futex syscall. (Ref. https://gem5.atlassian.net/browse/GEM5-676). However, I have tested the same for MI_Example protocol (using simple_ruby.py) and MESI_Two_Level (using se.py) upto 30+ threads and it works. This makes me wonder whether this is an MSI protocol bug. Any suggestions on how I should go on about this issue would be appreciated! Otherwise, is Full System mode the recommended option for Ruby+custom coherence protocol+multithreading (possibly using atomics)?
Thanks and Regards, Gautam Pathak
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