Le 17/12/2013 13:42, Tina ODAKA a écrit :

hi eric cc loic

if the time is lost with read and write, i should see that on system call as 'read' and 'write' but i do not see that.

so it is strange

i tried to strace for 8 minutes, it loose 12 seconds with systemcall, with futex, where you have 27817 err of futex.

i do not see at all 'read or 'write' for system call! tina

r5i0n0:~ # time strace -p 29123 -f -c Process 29411 attached with 31 threads - interrupt to quit ^CProcess 29123 detached Process 29203 detached

We are using java embedded database that may use linux lock file. If this lock file can cause futex wait errors, maybe i can search how to use another lock mecanism. -- Éric Chatellier - Code Lutin Tel: 02.40.50.29.28 - http://www.codelutin.com