Re: reading from input pipe is slow?

[Thomas Danckaert]

Hi Mark,

indeed, setting buffering with (setvbuf ...)  solved the issue.  
Thanks a lot!
> For some reason that I don't know, possibly historical, the pipes
> created by procedures in (ice-9 popen) are unbuffered by default.
I think you're right, but doesn't the manual suggest otherwise, when 
it says "Each direction has PIPE_BUF bytes of buffering" 
(https://www.gnu.org/software/guile/manual/html_node/Pipes.html)?  Or 
do I misinterpret that?
Also, let me mention that the statistical profiler from the 
(statprof) module has been very useful to isolate the problem. 
Initially I assumed the slowness was due to the external process.  
Only after running statprof did I realize that the problem was in my 
code.
Thomas