tneumann

3 ms·

1. 1.▲
   by tneumann 5y ago

   A dual socket EPYC costs about 15K. You can rent some online for 400$ a month. This gives you 128 cores for a relatively low price.
2. 2.▲
   by tneumann 5y ago

   The main problem is the unwinding lock. Memory allocation is a bit unfortunate, too, but much less so. Note that I am trying to fix the unwinding problem, I have submitted a patch to libunwind to eliminate the contention during unwinding:
3. 3.▲
   by tneumann 5y ago

   Of course the fib example is extreme. But some code bases do a lot of calls, and people care about calling overhead. I think a moderate calling overhead like, e.g., with Herbecptions is acceptable, because usually people doing something use
4. 4.▲
   by tneumann 5y ago

   That argument is only true in single threaded applications, at least given today's exception implementations. The more threads you have, the more problematic exceptions become. On the large machine you start to see performance problems
5. 5.▲
   by tneumann 5y ago

   I am the the original author, and trust me, I am describing a real world problem. I run massive parallel data processing tasks on machines with 128 cores, and unfortunately some of them produce errors deep within the processing pipeline. Fr