Re: [Pytables-users] threading/GIL

[Andrew S. <str...@as...>]

>I'm afraid that compression/uncompression is driven by HDF5 itself, so, with
>the actual patch it will happen in the same thread as the one doing the real
>I/O.
>
This is actually good news from a multi-CPU system (or perhaps even one 
with HyperThreading) perspective.  It means that substantial CPU 
processing can simultaneously occur in two threads because one of them 
(the thread doing compression) does not need the Python GIL, thus 
allowing the other thread to continue along in Python.