Ludovic Courtès <l...@gnu.org> skribis:
> 1. Use ‘fdatasync’ rather than ‘fsync’;
Turns out ‘fdatasync’ is about as expensive:
--8<---------------cut here---------------start------------->8---
1234:301 19:22:00 fdatasync(6) = 0 <0.398749>
1236:301 19:22:01 fdatasync(5) = 0 <0.198520>
1243:301 19:22:01 fdatasync(6) = 0 <0.231935>
1245:301 19:22:01 fdatasync(5) = 0 <0.183503>
1252:301 19:22:01 fdatasync(6) = 0 <0.230854>
1254:301 19:22:02 fdatasync(5) = 0 <0.248839>
1261:301 19:22:02 fdatasync(6) = 0 <0.181513>
1263:301 19:22:02 fdatasync(5) = 0 <0.141267>
1270:301 19:22:02 fdatasync(6) = 0 <0.131548>
1272:301 19:22:02 fdatasync(5) = 0 <0.124369>
1279:301 19:22:02 fdatasync(6) = 0 <0.121414>
--8<---------------cut here---------------end--------------->8---
Tested with:
--8<---------------cut here---------------start------------->8---
(define inetutils/fdatasync
(package/inherit inetutils
(version (string-append (package-version inetutils) ".fdatasync"))
(source (origin
(inherit (package-source inetutils))
(modules '((guix build utils)))
(snippet
'(substitute* "src/syslogd.c"
(("fsync") "fdatasync")))))))
--8<---------------cut here---------------end--------------->8---
It still makes more sense than ‘fsync’ though.
Ludo’.
