Hi,

I use QOCI to request data from Oracle. When i fetch a much data (4000 rows), Qt take 40% of time in futex . 

I investiguated and i see in qtcode/qdatetime.cpp, qTzSet() is called every row fetched (because i have a date type column) and just after localtime_r is called.

qTzSet is thread safe. Qt have a mutex lock and glibc also has => it's bad performance for many calls and many concurrents threads..

Is not necessary for me to refresh timezone every row. I export TZ environment variable before start program.

It's possible to envisage a variable macro to configure if we want refresh timezone or no when we are in multithread environnement ?

Thx.