Package: pv
Version: 1.1.4-1
Severity: wishlist
Hello,
from a quick grep through the sources and a quick look at transfer.c, it
looks like pv only does read(2)/write(2) data transfers.
It would be very interesting if it gave a try to splice(2) first, when
available: it'd mean I could use pv freely without worrying about
performing an extra in memory copy of potentially lots of data.
I have been improvising something like this recently with reasonable
happiness:
// Try splice
ssize_t res = splice(child_stdout_fd, NULL, next_fd, NULL, 4096*2,
SPLICE_F_MORE);
if (res >= 0)
return res > 0;
if (errno != EINVAL)
throw wibble::exception::System("splicing data from child postprocessor
to destination");
// Else pass it on to the traditional method
Ciao,
Enrico
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages pv depends on:
ii libc6 2.11.2-6+squeeze1 Embedded GNU C Library: Shared lib
pv recommends no packages.
Versions of packages pv suggests:
ii doc-base 0.9.5 utilities to manage online documen
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