Re: [PATCH] PR libgfortran/83649 Chunk large reads and writes

On Tue, Jan 2, 2018 at 4:15 PM, Thomas Koenig wrote: > Hi Janne, > >> +#define MAX_CHUNK 2147479552 > > > Two things to discuss: > > Should this also be backported to the 7-branch? Probably yes. Is the 6 branch still active? If so, maybe that one as well. > Also, we could set the default subreco

Re: [PATCH] PR libgfortran/83649 Chunk large reads and writes

Hi Janne, +#define MAX_CHUNK 2147479552 Two things to discuss: Should this also be backported to the 7-branch? Also, we could set the default subrecord length for unformatted I/O to the same value. Save a syscall :-) What do you think? Regards Thomas

[PATCH] PR libgfortran/83649 Chunk large reads and writes

It turns out that Linux never reads or writes more than 2147479552 bytes in a single syscall. For writes this is not a problem as libgfortran already contains a loop around write() to handle short writes. But for reads we cannot do this, since then read will hang if we have a short read when readin