On Wed, 2 Apr 2003, Terry Lambert wrote: > Peter Wemm wrote: > > No. It gives the ability for a thread to block on a syscall without > > stalling the entire system. Just try using mysqld on a system using libc_r > > and heavy disk IO. You can't select() on a read() from disk. Thats the > > ultimate reason to do it. The SMP parallelism is a bonus. > > Bug in FreeBSD's NBIO implementation. A read() that would result > in page-in needs to queue the request, but return EAGAIN to user > space to indicate the request cannot be satisfied. Making select() > come true for disk I/O after the fault is satisfied is a seperate > issue. Probably need to pass the fd all the way down. > Please quote the standard that defines this behavior. This is entirely counter to everything that I have ever read on the subject.Received on Wed Apr 02 2003 - 13:39:39 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:02 UTC