Hi, On 2018-07-09 11:59:06 +0200, Tomas Vondra wrote: > > * During the design phase, I looked into using bgworkers but given the > > number of > > in-flight pread(2) calls required to fully utilize the IO subsystem, I > > opted > > for something threaded (I was also confined to using Solaris which > > doesn't > > support posix_fadvise(2), so I couldn't sequentially dispatch async > > posix_fadvise(2) calls and hope for the best). > > > > Hmm, yeah. I'm not sure what to do with this. Using many (thousands?) of > prefetch processes seems like a bad idea - we surely can't make them regular > bgworkers. Perhaps we could use one process with many threads?
> Presumably if we knew about a better way to do prefetching without > posix_fadvise, we'd have implemented it in FilePrefetch(). But we just error > out instead :-( Solaris is dead. We shouldn't design for it... I think there's decent reasons to go for a non fadvise approach, but solaris imo isn't one of them. Greetings, Andres Freund
